CN102520241A - Three-phase charge-controlled electric energy meter based on resistance-capacitance voltage reduction and low-voltage direct-current/direct-current (DC/DC) power supply - Google Patents
Three-phase charge-controlled electric energy meter based on resistance-capacitance voltage reduction and low-voltage direct-current/direct-current (DC/DC) power supply Download PDFInfo
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- CN102520241A CN102520241A CN2011104412558A CN201110441255A CN102520241A CN 102520241 A CN102520241 A CN 102520241A CN 2011104412558 A CN2011104412558 A CN 2011104412558A CN 201110441255 A CN201110441255 A CN 201110441255A CN 102520241 A CN102520241 A CN 102520241A
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Abstract
The invention relates to a three-phase charge-controlled intelligent electric energy meter, and provides a low-power-consumption three-phase charge-controlled intelligent electric energy meter in which a three-phase charge-controlled electric energy meter power supply scheme is based on a resistance-capacitance voltage reduction principle and a low-voltage direct-current/direct-current (DC/DC) conversion power supply. The electric energy meter comprises a line power supply, an auxiliary power supply, a singlechip central processing unit (CPU) and a three-phase charge-controlled intelligent electric energy meter basic function module, wherein the line power supply consists of a resistance-capacitance voltage reduction circuit, a low-voltage DC/DC switching power supply circuit and a 485 power supply control circuit which are connected in turn; the auxiliary power supply is a switching power supply circuit; a pulse output booster circuit at an input/output (IO) port provides working voltage for a liquid crystal display part of the three-phase charge-controlled electric energy meter; and an external battery power supply circuit of the three-phase charge-controlled electric energy meter consists of an external battery which is matched with a DC-DC booster circuit to provide a power supply for meter reading during power failure. Power supply efficiency can be effectively improved, the power consumption of the electric energy meter is reduced, cost is reduced, and the requirements of energy conservation and environment friendliness are met.
Description
Technical field
The present invention relates to a kind of three-phase expense control intelligent electric energy meter, particularly a kind of three-phase takes the low-power consumption three-phase expense control intelligent electric energy meter that the control electric energy meter power source design uses resistance-capacitance depressurization principle and low voltage DC/DC converting power source.
Background technology
Three-phase takes widespread use transformer scheme in the power source design of controlling intelligent electric energy meter at present; Advantages such as it is high that transformer scheme has stability, and isolation effect is good, but general transformer frequency response scheme efficient is lower; Volume is bigger; Use the three-phase intelligent electric energy meter power consumption of transformer frequency response scheme bigger, and complete machine is heavier, can not adapts to modern society the energy-saving and cost-reducing demand of electric energy meter itself.
Summary of the invention
The object of the invention is exactly in order to overcome above-mentioned weak point of the prior art; And providing a kind of low-power consumption 1.0/0.5S level three-phase expense control intelligent electric energy meter, line power scheme to adopt the resistance-capacitance depressurization principle to combine with low voltage DC/DC Switching Power Supply scheme, accessory power supply adopts the power source design that is made up of the switch power special chip; Effectively improve power-efficient; Reduce the electric energy meter oneself power consumption, reduce cost, satisfy energy conservation and environment protection.
The objective of the invention is to realize: based on the three-phase expense control electric energy meter of resistance-capacitance depressurization and low voltage DC/DC power supply through following technical measures; Comprise line power; Accessory power supply; Single-chip microcomputer CPU and three-phase take control intelligent electric energy meter basic function module, and said line power is by the resistance-capacitance depressurization circuit, and low voltage DC/DC switching power circuit and 485 power control circuits are connected to form successively; Said accessory power supply is a switching power circuit.
In technique scheme, said resistance-capacitance depressurization circuit comprises voltage dependent resistor (VDR) RT1 ~ voltage dependent resistor (VDR) RT3, inductance L 1 ~ inductance L 5, resistance R 7 ~ resistance R 9, capacitor C 11 ~ capacitor C 18, rectifier bridge D6, rectifier bridge D7, voltage stabilizing diode D8 and voltage stabilizing diode D9; The A phase line is through inductance L 1, and resistance R 7 and capacitor C 11 are connected to 3 pin of rectifier bridge D6, and the B phase line is through inductance L 2; Resistance R 8 and capacitor C 12 are connected to 4 pin of rectifier bridge D6; The C phase line is through inductance L 3, and resistance R 9 and capacitor C 13 are connected to 3 pin of rectifier bridge D7, and the N line is connected to 4 pin of rectifier bridge D7; A phase line, B phase line and C phase line are connected to the N line through voltage dependent resistor (VDR) RT1 ~ voltage dependent resistor (VDR) RT3 respectively; 1 pin of rectifier bridge D6 links to each other with 1 pin of rectifier bridge D7, and 2 pin of rectifier bridge D6 link to each other with 2 pin of rectifier bridge D7; Electrochemical capacitor C14 is connected between 1 pin and 2 pin of rectifier bridge D6, and capacitor C 15, capacitor C 16 and zener diode D8 are connected in parallel on capacitor C 14 two ends; 1 pin of rectifier bridge D6 through inductance L 4 be connected to output voltage V+, 2 pin of rectifier bridge D6 through inductance L 5 be connected to output voltage V-, capacitor C 17, capacitor C 18 and voltage stabilizing diode D9 be connected in parallel on output voltage V+and V-between.
In technique scheme, said low voltage DC/DC switching power circuit comprises resistance R 1 ~ resistance R 6, capacitor C 1 ~ capacitor C 5, voltage stabilizing diode D1; Diode D2, compound diode D3, compound diode D4; FET Q1, voltage dependent resistor (VDR) RT7, comparer U1 and pickup coil T1; Resistance-capacitance depressurization circuit output voltage V-is connected to resistance-capacitance depressurization circuit output voltage V+ through resistance R 5 with voltage stabilizing diode D1, and capacitor C 1 is connected in parallel on the two ends of voltage stabilizing diode D1; V+ is connected to 3 pin of comparer U1 through resistance R 1; V+ is connected to 4 pin of comparer U1 through resistance R 6, and 1 pin of comparer U1 is connected to 4 pin through resistance R 3, and the 1 foot meridian capacitor C2 of comparer U1 is connected to 2 pin; 3 pin of comparer U1 are connected to 4 pin through resistance R 2; 2 pin of comparer U1 are connected to V-through resistance R 5, and 3 pin of comparer U1 are connected to V-through resistance R 4 and resistance R 5, and 5 pin of comparer U1 are connected to V+; 4 pin of comparer U1 are connected to the grid of FET Q1; The source electrode of FET Q1 is connected to V-through resistance R 5; The drain electrode of FET Q1 is connected to 3 pin of pickup coil T1, and V+ is connected to 2 pin of pickup coil T1, and V-is connected to 1 pin of pickup coil T1 through resistance R 5 and compound diode D3; Voltage dependent resistor (VDR) RT7 is connected in parallel between the source electrode and drain electrode of FET Q1; 5 pin of pickup coil T1 are respectively VCON and VAA through compound diode D4 output two-way voltage, and 4 pin of pickup coil T1 are GND, are connected with capacitor C 3 between VCON and the GND, are connected with capacitor C 4 between VAA and the GND; 7 pin of pickup coil T1 are through diode D2 output voltage V DD_485, and 6 pin of pickup coil T1 are GND_485, are connected with capacitor C 5 between VDD_485 and the GND_485.
In technique scheme, said 485 power control circuits comprise resistance R 10 ~ resistance R 16, capacitor C 7, capacitor C 8, triode BG3, triode BG4, voltage stabilizing triode U2 and optocoupler OP1; Wherein, Low voltage DC/DC switching power circuit output voltage V CON is connected to 1 pin of voltage stabilizing triode U2 through resistance R 10; Voltage VCON is connected to 3 pin of voltage stabilizing triode U2 through resistance R 12; 3 pin of voltage stabilizing triode U2 are connected to GND through resistance R 13, and capacitor C 7 is connected between 3 pin and GND of voltage stabilizing triode U2, and 2 pin of voltage stabilizing triode U2 are connected to GND; 1 pin of optocoupler OP1 is connected to voltage VCON through resistance R 10; 2 pin of optocoupler OP1 are connected to GND, and 4 pin of optocoupler OP1 are connected to low voltage DC/DC switching power circuit output voltage V DD_485, and 4 pin of optocoupler OP1 are connected to the emitter of triode BG3 through resistance R 14; 3 pin of optocoupler OP1 are connected to the base stage of triode BG4 through resistance R 16; The collector of triode BG3 is connected to voltage VCC_485, and the base stage of triode BG3 is connected to GND_485 through resistance R 15, and the base stage of triode BG3 is connected to the collector of triode BG4 through resistance R 11; The emitter of triode BG4 is connected to GND_485, is connected with capacitor C 8 between voltage VCC_485 and the GND_485.
In technique scheme, said 485 power control circuits comprise triode BG1, triode BG2, resistance R 17, resistance R 18, capacitor C 6 and optocoupler OP2; 1 pin and 2 pin of optocoupler OP2 are connected to the single-chip microcomputer central control unit, and 3 pin of optocoupler OP2 are connected to the base stage of triode BG1, and 4 pin of optocoupler OP2 are connected to the collector of triode BG2; The base stage of triode BG1 is connected to GND_485 through resistance R 18; The collector of triode BG1 is connected to voltage VCC_485; The emitter of triode BG1 is connected to the base stage of triode BG2; Low voltage DC/DC switching power circuit output voltage V DD_485 is connected to the emitter of triode BG2, and VDD_485 is connected to the emitter of triode BG1 through resistance R 17, is connected with capacitor C 6 between voltage VCC_485 and the GND_485.
In technique scheme, said accessory power supply part switching power circuit comprises composite thermistor RT4, voltage dependent resistor (VDR) RT5, voltage dependent resistor (VDR) RT6; Inductance L 6, inductance L 7, capacitor C 19 ~ capacitor C 30; Diode D10 ~ diode D18, resistance R 19 ~ resistance R 26, switching power source chip U3; The model of U3 is VIPER17L, three-terminal voltage-stabilizing pipe U4, optocoupler OP3 and pickup coil T2; Be connected with voltage dependent resistor (VDR) RT6 between accessory power supply L ' and the N '; L ' is connected to 1 pin of composite thermistor RT4, and N ' is connected to 3 pin of composite thermistor RT4, and capacitor C 19 is connected in parallel between 2 pin and N ' of composite thermistor RT4; 2 pin of composite thermistor RT4 are connected to 4 pin of rectifier bridge D11 through inductance L 6; N ' is connected to 3 pin of rectifier bridge D11 through inductance L 7, and voltage dependent resistor (VDR) RT5 is connected between 3 pin and 4 pin of rectifier bridge D11, and capacitor C 20 is connected between 1 pin and 2 pin of rectifier bridge D11; 1 pin of rectifier bridge D11 is connected to 1 pin of pickup coil T2; 2 pin of rectifier bridge D11 are connected to 5 pin of pickup coil T2, and 1 pin of pickup coil T2 is connected to 2 pin through voltage stabilizing diode D13 and diode D14, and 2 pin of pickup coil T2 are connected to 8 pin of switching power source chip U3; 4 pin of pickup coil T2 are connected to 2 pin of U3 through diode D16 and resistance R 19, and 5 pin of pickup coil T2 are connected to 1 pin of U3; Capacitor C 21, capacitor C 22 and voltage stabilizing diode D10 are connected in parallel between 1 pin and 2 pin of U3; Capacitor C 23 is connected between 4 pin and 5 pin of U3; 7 pin of pickup coil T2 output voltage behind diode D15 is VCC_FK; 6 pin of pickup coil T2 are connected to GND, and capacitor C 26 and capacitor C 27 are connected in parallel between VCC_FK and the GND; Voltage VCC_FK is connected to 1 pin of optocoupler OP3 through resistance R 20, and VCC_FK is connected to 2 pin of optocoupler OP3 through resistance R 24, resistance R 25 and capacitor C 29, and 1 pin of optocoupler OP3 links to each other with 2 pin of optocoupler OP3 through resistance R 20, resistance R 21; The plus earth of three-terminal voltage-stabilizing pipe U4, the negative electrode of three-terminal voltage-stabilizing pipe U4 is connected to 2 pin of optocoupler OP3, and the reference utmost point of three-terminal voltage-stabilizing pipe U4 is connected to GND through resistance R 26; 4 pin of optocoupler OP3 are connected to 4 pin of U3, and 3 pin of optocoupler OP3 are connected to 5 pin of U3; The 5 foot meridian capacitor C30 of pickup coil T2 are connected to 6 pin; Voltage VCC_FK is output voltage V AA after resistance R 23, is connected with capacitor C 28 between voltage VAA and the GND; 12 pin of pickup coil T2 output voltage after diode D18 and resistance R 22 is VCC_485; 11 pin of pickup coil T2 are connected to GND_485; Capacitor C 24 is connected between the negative electrode and GND_485 of diode D18; Voltage stabilizing diode D12 is connected in parallel on capacitor C 24 two ends, and voltage stabilizing diode D17 is connected in parallel between voltage VCC_485 and the GND_485, is connected with capacitor C 25 between VCC_485 and the GND_485 simultaneously.
In technique scheme, the external battery power circuit that said three-phase takes control electric energy meter uses an external battery, and cooperating the DC-DC booster circuit is that electric energy meter provides the power supply of checking meter that has a power failure; Said external battery power supply booster circuit comprises capacitor C 31 ~ capacitor C 33, resistance R 27 ~ resistance R 30, diode D19 ~ diode D21, FET Q2, triode Q3, step-up DC-DC conversion chip U5 and battery BT1; Wherein, the base stage of triode Q3 is connected to the detection of power loss end of single-chip microcomputer CPU through resistance R 27, and the emitter of triode Q3 is connected to voltage VAA, and the collector of triode Q3 is connected to GND through resistance R 28; The positive pole of battery BT1 is connected to the source S of FET Q2; The negative pole of battery BT1 is connected to GND; Capacitor C 31 is connected in parallel on the two ends of battery BT1; The source S of FET Q2 is connected to grid G through resistance R 29, and the grid G of FET Q2 is through resistance R 30, and diode D21 and resistance R 28 are connected to GND; The drain D of FET Q2 is connected to GND through capacitor C 32; The drain D of FET Q2 is connected to 3 pin of DC-DC conversion chip U5; 1 pin of DC-DC conversion chip U5 is connected to GND, and 2 pin of DC-DC conversion chip U5 are connected to GND through voltage stabilizing diode D20, and capacitor C 33 is connected in parallel on the two ends of voltage stabilizing diode D20; 3 pin of DC-DC conversion chip U5 are connected to 2 pin through diode D19, and 2 pin of U5 are the external battery voltage output end.
In technique scheme, the liquid-crystal display section of said three-phase expense control electric energy meter adopts IO mouth pulse output booster circuit that WV is provided; Said pulse output booster circuit comprises capacitor C 34 ~ capacitor C 36, resistance R 31, compound diode D22, diode D23; Wherein, The IO mouth P03 of single-chip microcomputer CPU is connected to GND through 1 pin and the capacitor C 35 of resistance R 31, compound diode D22; Capacitor C 34 is connected between 1 pin and 2 pin of compound diode D22; 2 pin of compound diode D22 output voltage V CC_LCD behind diode D23, capacitor C 36 is connected in parallel between output voltage V CC_LCD and the GND.
The three-phase expense control electric energy meter that the present invention is based on resistance-capacitance depressurization and low voltage DC/DC power supply compared with prior art has the following advantages: line power scheme employing resistance-capacitance depressurization principle and the mode that low voltage DC/DC Switching Power Supply scheme combines; Effectively improve power-efficient; Reduce the electric energy meter oneself power consumption, reduce the electric energy meter cost; It is low-power dissipation power supply also that accessory power supply adopts Switching Power Supply, reduces power volume and weight, realizes high-level efficiency; 485 power supplys add power control circuit, prevent because of brownout, and protection front stage circuits operate as normal was not damaged when the excessive or extraneous static of electric current etc. was attacked; Liquid-crystal display section adopts IO mouth pulse output booster circuit that WV is provided; The external battery power circuit only uses an external battery, and cooperating the DC-DC booster circuit is that electric energy meter provides the power supply of checking meter that has a power failure, and has reduced the hardware cost of electric energy meter; Satisfy energy conservation and environment protection, meet the energy-saving and cost-reducing development trend of electric energy meter.
Description of drawings
Fig. 1 takes the circuit theory diagrams of control electric energy meter for the three-phase that the present invention is based on resistance-capacitance depressurization and low voltage DC/DC power supply.
Fig. 2 is the circuit theory diagrams of circuit power unit among the present invention.
Fig. 3 connects synoptic diagram for resistance-capacitance depressurization circuit among the present invention.
Fig. 4 connects synoptic diagram for mesolow DC/DC switching power circuit of the present invention.
Fig. 5 connects synoptic diagram for 485 power control circuit instances one among the present invention.
Fig. 6 connects synoptic diagram for 485 power control circuit instances two among the present invention.
Fig. 7 connects synoptic diagram for accessory power supply part switching power circuit among the present invention.
Fig. 8 connects synoptic diagram for external battery supply booster circuit among the present invention.
Fig. 9 connects synoptic diagram for pulse output booster circuit among the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further description.
Like Fig. 1, shown in 2; The present invention provides a kind of three-phase expense control electric energy meter based on resistance-capacitance depressurization and low voltage DC/DC power supply; Comprise line power; Accessory power supply, single-chip microcomputer CPU and three-phase take control intelligent electric energy meter basic function module, and said line power and accessory power supply take the power supply of control intelligent electric energy meter basic function module for respectively single-chip microcomputer CPU and three-phase; Said line power is by the resistance-capacitance depressurization circuit, and low voltage DC/DC switching power circuit and 485 power control circuits are connected to form successively; Said accessory power supply is a switching power circuit.
Be illustrated in figure 3 as resistance-capacitance depressurization circuit connection synoptic diagram among the present invention.Said resistance-capacitance depressurization circuit comprises voltage dependent resistor (VDR) RT1 ~ voltage dependent resistor (VDR) RT3, inductance L 1 ~ inductance L 5, resistance R 7 ~ resistance R 9, capacitor C 11 ~ capacitor C 18, rectifier bridge D6, rectifier bridge D7, voltage stabilizing diode D8 and voltage stabilizing diode D9; The A phase line is through inductance L 1, and resistance R 7 and capacitor C 11 are connected to 3 pin of rectifier bridge D6, and the B phase line is through inductance L 2; Resistance R 8 and capacitor C 12 are connected to 4 pin of rectifier bridge D6; The C phase line is through inductance L 3, and resistance R 9 and capacitor C 13 are connected to 3 pin of rectifier bridge D7, and the N line is connected to 4 pin of rectifier bridge D7; A phase line, B phase line and C phase line are connected to the N line through voltage dependent resistor (VDR) RT1 ~ voltage dependent resistor (VDR) RT3 respectively; 1 pin of rectifier bridge D6 links to each other with 1 pin of rectifier bridge D7, and 2 pin of rectifier bridge D6 link to each other with 2 pin of rectifier bridge D7; Electrochemical capacitor C14 is connected between 1 pin and 2 pin of rectifier bridge D6, and capacitor C 15, capacitor C 16 and zener diode D8 are connected in parallel on capacitor C 14 two ends; 1 pin of rectifier bridge D6 through inductance L 4 be connected to output voltage V+, 2 pin of rectifier bridge D6 through inductance L 5 be connected to output voltage V-, capacitor C 17, capacitor C 18 and voltage stabilizing diode D9 be connected in parallel on output voltage V+and V-between.
Be illustrated in figure 4 as mesolow DC/DC switching power circuit of the present invention and connect synoptic diagram.Said low voltage DC/DC switching power circuit comprises resistance R 1 ~ resistance R 6, capacitor C 1 ~ capacitor C 5, voltage stabilizing diode D1, diode D2, compound diode D3, compound diode D4, FET Q1, voltage dependent resistor (VDR) RT7, comparer U1 and pickup coil T1; Resistance-capacitance depressurization circuit output voltage V-is connected to resistance-capacitance depressurization circuit output voltage V+ through resistance R 5 with voltage stabilizing diode D1, and capacitor C 1 is connected in parallel on the two ends of voltage stabilizing diode D1; V+ is connected to 3 pin of comparer U1 through resistance R 1; V+ is connected to 4 pin of comparer U1 through resistance R 6, and 1 pin of comparer U1 is connected to 4 pin through resistance R 3, and the 1 foot meridian capacitor C2 of comparer U1 is connected to 2 pin; 3 pin of comparer U1 are connected to 4 pin through resistance R 2; 2 pin of comparer U1 are connected to V-through resistance R 5, and 3 pin of comparer U1 are connected to V-through resistance R 4 and resistance R 5, and 5 pin of comparer U1 are connected to V+; 4 pin of comparer U1 are connected to the grid of FET Q1; The source electrode of FET Q1 is connected to V-through resistance R 5; The drain electrode of FET Q1 is connected to 3 pin of pickup coil T1, and V+ is connected to 2 pin of pickup coil T1, and V-is connected to 1 pin of pickup coil T1 through resistance R 5 and compound diode D3; Voltage dependent resistor (VDR) RT7 is connected in parallel between the source electrode and drain electrode of FET Q1; 5 pin of pickup coil T1 are respectively VCON and VAA through compound diode D4 output two-way voltage, and 4 pin of pickup coil T1 are GND, are connected with capacitor C 3 between VCON and the GND, are connected with capacitor C 4 between VAA and the GND; 7 pin of pickup coil T1 are through diode D2 output voltage V DD_485, and 6 pin of pickup coil T1 are GND_485, are connected with capacitor C 5 between VDD_485 and the GND_485.Above-mentioned voltage VAA is ammeter other circuit voltages except that 485 circuit, like single chip part, and metering section, display part or the like.
Be illustrated in figure 5 as 485 power control circuit instances, one connection synoptic diagram among the present invention.Said 485 power control circuits comprise resistance R 10 ~ resistance R 16, capacitor C 7, capacitor C 8, triode BG3, triode BG4, voltage stabilizing triode U2 and optocoupler OP1; Wherein, Low voltage DC/DC switching power circuit output voltage V CON is connected to 1 pin of voltage stabilizing triode U2 through resistance R 10; Voltage VCON is connected to 3 pin of voltage stabilizing triode U2 through resistance R 12; 3 pin of voltage stabilizing triode U2 are connected to GND through resistance R 13, and capacitor C 7 is connected between 3 pin and GND of voltage stabilizing triode U2, and 2 pin of voltage stabilizing triode U2 are connected to GND; 1 pin of optocoupler OP1 is connected to voltage VCON through resistance R 10; 2 pin of optocoupler OP1 are connected to GND, and 4 pin of optocoupler OP1 are connected to low voltage DC/DC switching power circuit output voltage V DD_485, and 4 pin of optocoupler OP1 are connected to the emitter of triode BG3 through resistance R 14; 3 pin of optocoupler OP1 are connected to the base stage of triode BG4 through resistance R 16; The collector of triode BG3 is connected to voltage VCC_485, and the base stage of triode BG3 is connected to GND_485 through resistance R 15, and the base stage of triode BG3 is connected to the collector of triode BG4 through resistance R 11; The emitter of triode BG4 is connected to GND_485, is connected with capacitor C 8 between voltage VCC_485 and the GND_485.Above-mentioned voltage VCC_485 is 485 circuit voltages, by the output voltage V DD_485 process control circuit output of front.
Be illustrated in figure 6 as 485 power control circuit instances, two connection synoptic diagram among the present invention.Said 485 power control circuits comprise triode BG1, triode BG2, resistance R 17, resistance R 18, capacitor C 6 and optocoupler OP2; 1 pin and 2 pin of optocoupler OP2 are connected to the single-chip microcomputer central control unit, and 3 pin of optocoupler OP2 are connected to the base stage of triode BG1, and 4 pin of optocoupler OP2 are connected to the collector of triode BG2; The base stage of triode BG1 is connected to GND_485 through resistance R 18; The collector of triode BG1 is connected to voltage VCC_485; The emitter of triode BG1 is connected to the base stage of triode BG2; Low voltage DC/DC switching power circuit output voltage V DD_485 is connected to the emitter of triode BG2, and VDD_485 is connected to the emitter of triode BG1 through resistance R 17, is connected with capacitor C 6 between voltage VCC_485 and the GND_485.Above-mentioned voltage VCC_485 is 485 circuit voltages, by the output voltage V DD_485 process control circuit output of front.
Be illustrated in figure 7 as accessory power supply part switching power circuit connection synoptic diagram among the present invention.Said accessory power supply part switching power circuit comprises composite thermistor RT4, voltage dependent resistor (VDR) RT5, voltage dependent resistor (VDR) RT6; Inductance L 6, inductance L 7, capacitor C 19 ~ capacitor C 30; Diode D10 ~ diode D18, resistance R 19 ~ resistance R 26, switching power source chip U3; The model of U3 is VIPER17L, three-terminal voltage-stabilizing pipe U4, optocoupler OP3 and pickup coil T2; Be connected with voltage dependent resistor (VDR) RT6 between accessory power supply L ' and the N '; L ' is connected to 1 pin of composite thermistor RT4, and N ' is connected to 3 pin of composite thermistor RT4, and capacitor C 19 is connected in parallel between 2 pin and N ' of composite thermistor RT4; 2 pin of composite thermistor RT4 are connected to 4 pin of rectifier bridge D11 through inductance L 6; N ' is connected to 3 pin of rectifier bridge D11 through inductance L 7, and voltage dependent resistor (VDR) RT5 is connected between 3 pin and 4 pin of rectifier bridge D11, and capacitor C 20 is connected between 1 pin and 2 pin of rectifier bridge D11; 1 pin of rectifier bridge D11 is connected to 1 pin of pickup coil T2; 2 pin of rectifier bridge D11 are connected to 5 pin of pickup coil T2, and 1 pin of pickup coil T2 is connected to 2 pin through voltage stabilizing diode D13 and diode D14, and 2 pin of pickup coil T2 are connected to 8 pin of switching power source chip U3; 4 pin of pickup coil T2 are connected to 2 pin of U3 through diode D16 and resistance R 19, and 5 pin of pickup coil T2 are connected to 1 pin of U3; Capacitor C 21, capacitor C 22 and voltage stabilizing diode D10 are connected in parallel between 1 pin and 2 pin of U3; Capacitor C 23 is connected between 4 pin and 5 pin of U3; 7 pin of pickup coil T2 output voltage behind diode D15 is VCC_FK; 6 pin of pickup coil T2 are connected to GND, and capacitor C 26 and capacitor C 27 are connected in parallel between VCC_FK and the GND; Voltage VCC_FK is connected to 1 pin of optocoupler OP3 through resistance R 20, and VCC_FK is connected to 2 pin of optocoupler OP3 through resistance R 24, resistance R 25 and capacitor C 29, and 1 pin of optocoupler OP3 links to each other with 2 pin of optocoupler OP3 through resistance R 20, resistance R 21; The plus earth of three-terminal voltage-stabilizing pipe U4, the negative electrode of three-terminal voltage-stabilizing pipe U4 is connected to 2 pin of optocoupler OP3, and the reference utmost point of three-terminal voltage-stabilizing pipe U4 is connected to GND through resistance R 26; 4 pin of optocoupler OP3 are connected to 4 pin of U3, and 3 pin of optocoupler OP3 are connected to 5 pin of U3; The 5 foot meridian capacitor C30 of pickup coil T2 are connected to 6 pin; Voltage VCC_FK is output voltage V AA after resistance R 23, is connected with capacitor C 28 between voltage VAA and the GND; 12 pin of pickup coil T2 output voltage after diode D18 and resistance R 22 is VCC_485; 11 pin of pickup coil T2 are connected to GND_485; Capacitor C 24 is connected between the negative electrode and GND_485 of diode D18; Voltage stabilizing diode D12 is connected in parallel on capacitor C 24 two ends, and voltage stabilizing diode D17 is connected in parallel between voltage VCC_485 and the GND_485, is connected with capacitor C 25 between VCC_485 and the GND_485 simultaneously.Above-mentioned VAA is ammeter other circuit voltages except that 485 circuit, like single chip part, and metering section, display part or the like.Above-mentioned voltage VCC_FK is a Switching Power Supply feedback end voltage.
Be illustrated in figure 8 as external battery supply booster circuit connection synoptic diagram among the present invention.Said external battery power supply booster circuit comprises capacitor C 31 ~ capacitor C 33, resistance R 27 ~ resistance R 30, diode D19 ~ diode D21, FET Q2, triode Q3, step-up DC-DC conversion chip U5 and battery BT1.Wherein, the base stage of triode Q3 is connected to the detection of power loss mouth of single machine unit through resistance R 27, and the emitter of triode Q3 is connected to voltage VAA, and the collector of triode Q3 is connected to GND through resistance R 28; The positive pole of battery BT1 is connected to the source S of FET Q2, and the negative pole of battery BT1 is connected to GND, and capacitor C 31 is connected in parallel on the two ends of battery BT1; The source S of FET Q2 is connected to grid G through resistance R 29, and the grid G of FET Q2 is through resistance R 30, and diode D21 and resistance R 28 are connected to GND; The drain D of FET Q2 is connected to GND through capacitor C 32; The drain D of FET Q2 is connected to 3 pin of conversion chip U5, and 1 pin of conversion chip U5 is connected to GND, and 2 pin of conversion chip U5 are connected to GND through voltage stabilizing diode D20, and capacitor C 33 is connected in parallel on the two ends of voltage stabilizing diode D20; 3 pin of conversion chip U5 are connected to 2 pin through diode D19, and 2 pin of conversion chip U5 are the external battery voltage output.Above-mentioned VAA is ammeter other circuit voltages except that 485 circuit, like single chip part, and metering section, display part or the like.
Be illustrated in figure 9 as pulse output booster circuit connection synoptic diagram among the present invention.Said pulse output booster circuit comprises capacitor C 34 ~ capacitor C 36, resistance R 31, compound diode D22, diode D23.Wherein, The IO mouth P03 of single-chip microcomputer CPU is connected to GND through 1 pin and the capacitor C 35 of resistance R 31, compound diode D22; Capacitor C 34 is connected between 1 pin and 2 pin of compound diode D22; 2 pin of compound diode D22 output voltage V CC_LCD behind diode D23, capacitor C 36 is connected in parallel between output voltage V CC_LCD and the GND.Above-mentioned voltage VCC_LCD is the liquid-crystal display section WV.This circuit can be little current stabilization load WV is provided, like liquid crystal display driving voltage of electric energy meter etc.
The content that this instructions is not done to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (8)
1. the three-phase based on resistance-capacitance depressurization and low voltage DC/DC power supply takes control electric energy meter; Comprise line power; Accessory power supply; Single-chip microcomputer CPU and three-phase take control intelligent electric energy meter basic function module, and it is characterized in that: said line power is by the resistance-capacitance depressurization circuit, and low voltage DC/DC switching power circuit and 485 power control circuits are connected to form successively; Said accessory power supply is a switching power circuit.
2. the three-phase based on resistance-capacitance depressurization and low voltage DC/DC power supply according to claim 1 takes control electric energy meter; It is characterized in that: said resistance-capacitance depressurization circuit comprises voltage dependent resistor (VDR) RT1 ~ voltage dependent resistor (VDR) RT3, inductance L 1 ~ inductance L 5, resistance R 7 ~ resistance R 9; Capacitor C 11 ~ capacitor C 18; Rectifier bridge D6, rectifier bridge D7, voltage stabilizing diode D8 and voltage stabilizing diode D9; The A phase line is through inductance L 1, and resistance R 7 and capacitor C 11 are connected to 3 pin of rectifier bridge D6, and the B phase line is through inductance L 2; Resistance R 8 and capacitor C 12 are connected to 4 pin of rectifier bridge D6; The C phase line is through inductance L 3, and resistance R 9 and capacitor C 13 are connected to 3 pin of rectifier bridge D7, and the N line is connected to 4 pin of rectifier bridge D7; A phase line, B phase line and C phase line are connected to the N line through voltage dependent resistor (VDR) RT1 ~ voltage dependent resistor (VDR) RT3 respectively; 1 pin of rectifier bridge D6 links to each other with 1 pin of rectifier bridge D7, and 2 pin of rectifier bridge D6 link to each other with 2 pin of rectifier bridge D7; Electrochemical capacitor C14 is connected between 1 pin and 2 pin of rectifier bridge D6, and capacitor C 15, capacitor C 16 and zener diode D8 are connected in parallel on capacitor C 14 two ends; 1 pin of rectifier bridge D6 through inductance L 4 be connected to output voltage V+, 2 pin of rectifier bridge D6 through inductance L 5 be connected to output voltage V-, capacitor C 17, capacitor C 18 and voltage stabilizing diode D9 be connected in parallel on output voltage V+and V-between.
3. the three-phase based on resistance-capacitance depressurization and low voltage DC/DC power supply according to claim 1 takes control electric energy meter, and it is characterized in that: said low voltage DC/DC switching power circuit comprises resistance R 1 ~ resistance R 6, capacitor C 1 ~ capacitor C 5; Voltage stabilizing diode D1, diode D2, compound diode D3; Compound diode D4; FET Q1, voltage dependent resistor (VDR) RT7, comparer U1 and pickup coil T1; Resistance-capacitance depressurization circuit output voltage V-is connected to resistance-capacitance depressurization circuit output voltage V+ through resistance R 5 with voltage stabilizing diode D1, and capacitor C 1 is connected in parallel on the two ends of voltage stabilizing diode D1; V+ is connected to 3 pin of comparer U1 through resistance R 1; V+ is connected to 4 pin of comparer U1 through resistance R 6, and 1 pin of comparer U1 is connected to 4 pin through resistance R 3, and the 1 foot meridian capacitor C2 of comparer U1 is connected to 2 pin; 3 pin of comparer U1 are connected to 4 pin through resistance R 2; 2 pin of comparer U1 are connected to V-through resistance R 5, and 3 pin of comparer U1 are connected to V-through resistance R 4 and resistance R 5, and 5 pin of comparer U1 are connected to V+; 4 pin of comparer U1 are connected to the grid of FET Q1; The source electrode of FET Q1 is connected to V-through resistance R 5; The drain electrode of FET Q1 is connected to 3 pin of pickup coil T1, and V+ is connected to 2 pin of pickup coil T1, and V-is connected to 1 pin of pickup coil T1 through resistance R 5 and compound diode D3; Voltage dependent resistor (VDR) RT7 is connected in parallel between the source electrode and drain electrode of FET Q1; 5 pin of pickup coil T1 are respectively VCON and VAA through compound diode D4 output two-way voltage, and 4 pin of pickup coil T1 are GND, are connected with capacitor C 3 between VCON and the GND, are connected with capacitor C 4 between VAA and the GND; 7 pin of pickup coil T1 are through diode D2 output voltage V DD_485, and 6 pin of pickup coil T1 are GND_485, are connected with capacitor C 5 between VDD_485 and the GND_485.
4. the three-phase based on resistance-capacitance depressurization and low voltage DC/DC power supply according to claim 1 takes control electric energy meter, and it is characterized in that: said 485 power control circuits comprise resistance R 10 ~ resistance R 16, capacitor C 7; Capacitor C 8; Triode BG3, triode BG4, voltage stabilizing triode U2 and optocoupler OP1; Wherein, Low voltage DC/DC switching power circuit output voltage V CON is connected to 1 pin of voltage stabilizing triode U2 through resistance R 10; Voltage VCON is connected to 3 pin of voltage stabilizing triode U2 through resistance R 12; 3 pin of voltage stabilizing triode U2 are connected to GND through resistance R 13, and capacitor C 7 is connected between 3 pin and GND of voltage stabilizing triode U2, and 2 pin of voltage stabilizing triode U2 are connected to GND; 1 pin of optocoupler OP1 is connected to voltage VCON through resistance R 10; 2 pin of optocoupler OP1 are connected to GND, and 4 pin of optocoupler OP1 are connected to low voltage DC/DC switching power circuit output voltage V DD_485, and 4 pin of optocoupler OP1 are connected to the emitter of triode BG3 through resistance R 14; 3 pin of optocoupler OP1 are connected to the base stage of triode BG4 through resistance R 16; The collector of triode BG3 is connected to voltage VCC_485, and the base stage of triode BG3 is connected to GND_485 through resistance R 15, and the base stage of triode BG3 is connected to the collector of triode BG4 through resistance R 11; The emitter of triode BG4 is connected to GND_485, is connected with capacitor C 8 between voltage VCC_485 and the GND_485.
5. the three-phase based on resistance-capacitance depressurization and low voltage DC/DC power supply according to claim 1 takes control electric energy meter, and it is characterized in that: said 485 power control circuits comprise triode BG1, triode BG2, resistance R 17, resistance R 18, capacitor C 6 and optocoupler OP2; 1 pin and 2 pin of optocoupler OP2 are connected to the single-chip microcomputer central control unit, and 3 pin of optocoupler OP2 are connected to the base stage of triode BG1, and 4 pin of optocoupler OP2 are connected to the collector of triode BG2; The base stage of triode BG1 is connected to GND_485 through resistance R 18; The collector of triode BG1 is connected to voltage VCC_485; The emitter of triode BG1 is connected to the base stage of triode BG2; Low voltage DC/DC switching power circuit output voltage V DD_485 is connected to the emitter of triode BG2, and VDD_485 is connected to the emitter of triode BG1 through resistance R 17, is connected with capacitor C 6 between voltage VCC_485 and the GND_485.
6. the three-phase based on resistance-capacitance depressurization and low voltage DC/DC power supply according to claim 1 takes control electric energy meter, it is characterized in that: said accessory power supply part switching power circuit comprises composite thermistor RT4, voltage dependent resistor (VDR) RT5, voltage dependent resistor (VDR) RT6; Inductance L 6, inductance L 7, capacitor C 19 ~ capacitor C 30; Diode D10 ~ diode D18, resistance R 19 ~ resistance R 26, switching power source chip U3; The model of U3 is VIPER17L, three-terminal voltage-stabilizing pipe U4, optocoupler OP3 and pickup coil T2; Be connected with voltage dependent resistor (VDR) RT6 between accessory power supply L ' and the N '; L ' is connected to 1 pin of composite thermistor RT4, and N ' is connected to 3 pin of composite thermistor RT4, and capacitor C 19 is connected in parallel between 2 pin and N ' of composite thermistor RT4; 2 pin of composite thermistor RT4 are connected to 4 pin of rectifier bridge D11 through inductance L 6; N ' is connected to 3 pin of rectifier bridge D11 through inductance L 7, and voltage dependent resistor (VDR) RT5 is connected between 3 pin and 4 pin of rectifier bridge D11, and capacitor C 20 is connected between 1 pin and 2 pin of rectifier bridge D11; 1 pin of rectifier bridge D11 is connected to 1 pin of pickup coil T2; 2 pin of rectifier bridge D11 are connected to 5 pin of pickup coil T2, and 1 pin of pickup coil T2 is connected to 2 pin through voltage stabilizing diode D13 and diode D14, and 2 pin of pickup coil T2 are connected to 8 pin of switching power source chip U3; 4 pin of pickup coil T2 are connected to 2 pin of U3 through diode D16 and resistance R 19, and 5 pin of pickup coil T2 are connected to 1 pin of U3; Capacitor C 21, capacitor C 22 and voltage stabilizing diode D10 are connected in parallel between 1 pin and 2 pin of U3; Capacitor C 23 is connected between 4 pin and 5 pin of U3; 7 pin of pickup coil T2 output voltage behind diode D15 is VCC_FK; 6 pin of pickup coil T2 are connected to GND, and capacitor C 26 and capacitor C 27 are connected in parallel between VCC_FK and the GND; Voltage VCC_FK is connected to 1 pin of optocoupler OP3 through resistance R 20, and VCC_FK is connected to 2 pin of optocoupler OP3 through resistance R 24, resistance R 25 and capacitor C 29, and 1 pin of optocoupler OP3 links to each other with 2 pin of optocoupler OP3 through resistance R 20, resistance R 21; The plus earth of three-terminal voltage-stabilizing pipe U4, the negative electrode of three-terminal voltage-stabilizing pipe U4 is connected to 2 pin of optocoupler OP3, and the reference utmost point of three-terminal voltage-stabilizing pipe U4 is connected to GND through resistance R 26; 4 pin of optocoupler OP3 are connected to 4 pin of U3, and 3 pin of optocoupler OP3 are connected to 5 pin of U3; The 5 foot meridian capacitor C30 of pickup coil T2 are connected to 6 pin; Voltage VCC_FK is output voltage V AA after resistance R 23, is connected with capacitor C 28 between voltage VAA and the GND; 12 pin of pickup coil T2 output voltage after diode D18 and resistance R 22 is VCC_485; 11 pin of pickup coil T2 are connected to GND_485; Capacitor C 24 is connected between the negative electrode and GND_485 of diode D18; Voltage stabilizing diode D12 is connected in parallel on capacitor C 24 two ends, and voltage stabilizing diode D17 is connected in parallel between voltage VCC_485 and the GND_485, is connected with capacitor C 25 between VCC_485 and the GND_485 simultaneously.
7. the three-phase based on resistance-capacitance depressurization and low voltage DC/DC power supply according to claim 1 takes control electric energy meter; It is characterized in that: the external battery power circuit of said three-phase expense control electric energy meter uses an external battery, and cooperating the DC-DC booster circuit is that electric energy meter provides the power supply of checking meter that has a power failure; Said external battery power supply booster circuit comprises capacitor C 31 ~ capacitor C 33, resistance R 27 ~ resistance R 30, diode D19 ~ diode D21, FET Q2, triode Q3, step-up DC-DC conversion chip U5 and battery BT1; Wherein, the base stage of triode Q3 is connected to the detection of power loss end of single-chip microcomputer CPU through resistance R 27, and the emitter of triode Q3 is connected to voltage VAA, and the collector of triode Q3 is connected to GND through resistance R 28; The positive pole of battery BT1 is connected to the source S of FET Q2; The negative pole of battery BT1 is connected to GND; Capacitor C 31 is connected in parallel on the two ends of battery BT1; The source S of FET Q2 is connected to grid G through resistance R 29, and the grid G of FET Q2 is through resistance R 30, and diode D21 and resistance R 28 are connected to GND; The drain D of FET Q2 is connected to GND through capacitor C 32; The drain D of FET Q2 is connected to 3 pin of DC-DC conversion chip U5; 1 pin of DC-DC conversion chip U5 is connected to GND, and 2 pin of DC-DC conversion chip U5 are connected to GND through voltage stabilizing diode D20, and capacitor C 33 is connected in parallel on the two ends of voltage stabilizing diode D20; 3 pin of DC-DC conversion chip U5 are connected to 2 pin through diode D19, and 2 pin of U5 are the external battery voltage output end.
8. the three-phase based on resistance-capacitance depressurization and low voltage DC/DC power supply according to claim 1 takes control electric energy meter, it is characterized in that: the liquid-crystal display section of said three-phase expense control electric energy meter adopts IO mouth pulse output booster circuit that WV is provided; Said pulse output booster circuit comprises capacitor C 34 ~ capacitor C 36, resistance R 31, compound diode D22, diode D23; Wherein, The IO mouth P03 of single-chip microcomputer CPU is connected to GND through 1 pin and the capacitor C 35 of resistance R 31, compound diode D22; Capacitor C 34 is connected between 1 pin and 2 pin of compound diode D22; 2 pin of compound diode D22 output voltage V CC_LCD behind diode D23, capacitor C 36 is connected in parallel between output voltage V CC_LCD and the GND.
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| CN201110441255.8A CN102520241B (en) | 2011-12-26 | 2011-12-26 | Three-phase charge-controlled electric energy meter based on resistance-capacitance voltage reduction and low-voltage direct-current/direct-current (DC/DC) power supply |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248117A (en) * | 2013-04-16 | 2013-08-14 | 珠海博威电气有限公司 | PT-free intelligent high-voltage switch |
| CN104133108A (en) * | 2013-05-01 | 2014-11-05 | 德克萨斯仪器德国股份有限公司 | Tracking energy consumption using a boost-buck technique |
| CN105226626A (en) * | 2015-10-22 | 2016-01-06 | 宁波三星医疗电气股份有限公司 | A kind of anti-static electricity interference circuit |
| CN105467205A (en) * | 2015-05-23 | 2016-04-06 | 李银龙 | Electric energy meter with zero-power RF meter reading |
| CN106297241A (en) * | 2016-08-24 | 2017-01-04 | 宁波三星医疗电气股份有限公司 | Intelligent electric energy meter GPRS power down reporting system |
| CN106533159A (en) * | 2016-12-16 | 2017-03-22 | 江苏林洋能源股份有限公司 | Resistance-capacitance step-down power supply for three-phase energy meter |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3300669A1 (en) * | 1982-11-30 | 1984-05-30 | LGZ Landis & Gyr Zug AG, Zug | Power supply circuit without a transformer |
| CN2689236Y (en) * | 2004-04-12 | 2005-03-30 | 吴沛峰 | Three-phase and four-wire electronic idle and active assembled electric energy meter |
| US20060038548A1 (en) * | 2004-08-17 | 2006-02-23 | Elster Electricity, Llc. | High voltage regulator for an electric meter power supply |
| CN201045621Y (en) * | 2007-06-07 | 2008-04-09 | 武汉盛帆电子股份有限公司 | Electric energy meter with power-off meter reading power supply device |
| CN201974474U (en) * | 2011-03-01 | 2011-09-14 | 深圳市森晖电子有限公司 | State grid three-phase intelligent electric energy meter |
| CN102183683A (en) * | 2011-01-24 | 2011-09-14 | 武汉盛帆电子股份有限公司 | Switch power supply-based single-phase low power consumption intelligent electric energy meter |
| CN102213728A (en) * | 2011-04-12 | 2011-10-12 | 武汉盛帆电子股份有限公司 | Resistance-capacitance type intelligent three-phase cost control electric energy meter based on direct current (DC)-DC |
-
2011
- 2011-12-26 CN CN201110441255.8A patent/CN102520241B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3300669A1 (en) * | 1982-11-30 | 1984-05-30 | LGZ Landis & Gyr Zug AG, Zug | Power supply circuit without a transformer |
| CN2689236Y (en) * | 2004-04-12 | 2005-03-30 | 吴沛峰 | Three-phase and four-wire electronic idle and active assembled electric energy meter |
| US20060038548A1 (en) * | 2004-08-17 | 2006-02-23 | Elster Electricity, Llc. | High voltage regulator for an electric meter power supply |
| CN201045621Y (en) * | 2007-06-07 | 2008-04-09 | 武汉盛帆电子股份有限公司 | Electric energy meter with power-off meter reading power supply device |
| CN102183683A (en) * | 2011-01-24 | 2011-09-14 | 武汉盛帆电子股份有限公司 | Switch power supply-based single-phase low power consumption intelligent electric energy meter |
| CN201974474U (en) * | 2011-03-01 | 2011-09-14 | 深圳市森晖电子有限公司 | State grid three-phase intelligent electric energy meter |
| CN102213728A (en) * | 2011-04-12 | 2011-10-12 | 武汉盛帆电子股份有限公司 | Resistance-capacitance type intelligent three-phase cost control electric energy meter based on direct current (DC)-DC |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248117A (en) * | 2013-04-16 | 2013-08-14 | 珠海博威电气有限公司 | PT-free intelligent high-voltage switch |
| CN103248117B (en) * | 2013-04-16 | 2015-08-05 | 珠海博威电气有限公司 | PT-free intelligent high-voltage switch |
| CN104133108A (en) * | 2013-05-01 | 2014-11-05 | 德克萨斯仪器德国股份有限公司 | Tracking energy consumption using a boost-buck technique |
| CN105467205A (en) * | 2015-05-23 | 2016-04-06 | 李银龙 | Electric energy meter with zero-power RF meter reading |
| CN105226626A (en) * | 2015-10-22 | 2016-01-06 | 宁波三星医疗电气股份有限公司 | A kind of anti-static electricity interference circuit |
| CN105226626B (en) * | 2015-10-22 | 2017-10-10 | 宁波三星医疗电气股份有限公司 | A kind of anti-static electricity interference circuit |
| CN106297241A (en) * | 2016-08-24 | 2017-01-04 | 宁波三星医疗电气股份有限公司 | Intelligent electric energy meter GPRS power down reporting system |
| CN106297241B (en) * | 2016-08-24 | 2019-08-20 | 宁波三星医疗电气股份有限公司 | Intelligent electric energy meter GPRS power down reporting system |
| CN106533159A (en) * | 2016-12-16 | 2017-03-22 | 江苏林洋能源股份有限公司 | Resistance-capacitance step-down power supply for three-phase energy meter |
| CN107645268A (en) * | 2017-08-23 | 2018-01-30 | 上海华希软件科技有限公司 | Low-speed electronic vehicle controller power-off protecting circuit |
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