WO2017031694A1 - Power supply of single-phase electronic electric energy meter - Google Patents

Power supply of single-phase electronic electric energy meter Download PDF

Info

Publication number
WO2017031694A1
WO2017031694A1 PCT/CN2015/088037 CN2015088037W WO2017031694A1 WO 2017031694 A1 WO2017031694 A1 WO 2017031694A1 CN 2015088037 W CN2015088037 W CN 2015088037W WO 2017031694 A1 WO2017031694 A1 WO 2017031694A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
power supply
voltage
switch
output
Prior art date
Application number
PCT/CN2015/088037
Other languages
French (fr)
Chinese (zh)
Inventor
嵇成龙
龙代文
Original Assignee
深圳市思达仪表有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市思达仪表有限公司 filed Critical 深圳市思达仪表有限公司
Priority to PCT/CN2015/088037 priority Critical patent/WO2017031694A1/en
Publication of WO2017031694A1 publication Critical patent/WO2017031694A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Definitions

  • the invention belongs to the field of electronic measuring instrument manufacturing, and in particular relates to a single-phase electronic energy meter power supply.
  • the power supply circuit of the existing single-phase electronic energy meter mostly adopts a power frequency transformer and a linear voltage stabilization circuit (as shown in FIG. 1 ), and the working range is between 85V and 280V.
  • This circuit or similar circuit is widely used in single-phase electronic energy meters because it does not use a switching power supply and is relatively reliable.
  • this kind of circuit has high requirements on the power grid. In the backward areas where the power grid fluctuates greatly, single-phase electronic energy meters using such circuits often cannot work, resulting in the loss of electricity costs.
  • one of the solutions is to adopt a switching power supply scheme, such as the patent number disclosed in the Chinese utility model patent: 02271250.X, the technical solution named "switching power supply with a wide input voltage range", disclosed by the switching power supply
  • the circuit structure is mainly composed of a control chip, a transformer, an electronic switch, a start circuit of a control chip, a voltage feedback circuit, a rectification filter circuit, and a voltage stabilization circuit.
  • the power meter of the switching power supply is used, and the working range of the electric energy meter is expanded.
  • the capacitor of the starting circuit needs to be intermittently charged and discharged to operate the control chip, thereby controlling the on and off of the electronic switch, so the reliability is lowered.
  • the second scheme is to improve on the voltage regulator circuit. After the power frequency transformer is stepped down, the TPIC74100 chip is used to stabilize the voltage. This technology uses MOS tube to realize the buck-boost topology switching. The circuit design allows the energy meter to also Achieving operating voltages below 85V, but the TPIC74100 chip is expensive and inconvenient to promote.
  • the working range of the electric energy meter is much lower than 85V, can reach 40V or less, and the production cost is low.
  • Single-phase electronic energy meter power supply comprising power frequency transformer T1, rectifier circuit D1, filter circuit C1, sampling control circuit, switch circuit SW1, step-down DC/DC circuit and step-up DC/DC circuit, power frequency alternating current Vin
  • the DC voltage terminal V1 is obtained through the rectifier circuit D1 and the filter circuit C1.
  • the V1 terminal is directly connected to the input terminal of the step-down DC/DC circuit, and the step-down DC/DC circuit outputs the DC power V2 to the booster.
  • the DC/DC circuit, the output terminal V3 of the step-up DC/DC circuit provides a stable working power to the CPU and the metering chip of the electric energy meter; one end of the sampling control circuit is connected to the V1 end, and the other end is connected to the control end of the switch circuit SW1, the switch
  • the input and output ends of the circuit SW1 are respectively connected to the input and output ends of the step-down DC/DC circuit; wherein, when the voltage of the V1 terminal satisfies the normal input voltage of the step-down DC/DC circuit, the sampling control circuit outputs a control signal to make the switch circuit SW1 is disconnected; when the voltage of the V1 terminal is lower than the normal input voltage of the step-down DC/DC circuit, the sampling control circuit outputs a control signal to trigger the switch circuit SW1 to be closed, the step-down DC/DC circuit is short-circuited, and the voltage of the V1 terminal passes through the switch circuit.
  • S W1 is connected to the step-up DC/DC circuit to keep the V3 power supply
  • the switch circuit SW1 is composed of a resistor, a triode, a clamp resistor and a switch tube. One end of the resistor is connected to the output end of the sampling control circuit, and the other end is connected to the base of the triode. The emitter of the triode is connected to the output end of the step-up DC/DC circuit.
  • the electrodes are respectively connected to one end of the switch tube and the clamp resistor, and the other end of the clamp resistor is connected to the input end of the step-up DC/DC circuit, and the other end of the switch tube is connected to the input end of the step-down DC/DC circuit.
  • a switching circuit SW1 is connected in parallel to the input and output terminals of the step-down DC/DC circuit, and the switching circuit SW1 controls its on/off through the sampling control circuit.
  • V2 is the normal working voltage of the step-down DC/DC circuit
  • the step-down DC/ The DC circuit works, and the V1 is stepped down and then boosted by the step-up DC/DC circuit to obtain a stable power supply operating power.
  • the sampling control circuit outputs a control signal to trigger the triode of the switch circuit SW1.
  • the collector of the triode When turned on, the collector of the triode triggers the switch to conduct, so that the step-down DC/DC circuit is short-circuited, and the V1 terminal is directly connected to the step-up DC/DC circuit to make the V3 power supply stable.
  • the circuit After testing, the circuit can meet the power requirements of the single-phase electronic energy meter AC40-400V, and the overall solution cost is not high, the reliability is high, and the power supply voltage can be freely set.
  • Figure 1 is a block diagram showing the operation of a power supply using a linear regulator circuit
  • FIG. 2 is a block diagram showing the working principle of a single-phase electronic energy meter power supply according to the present invention
  • FIG. 3 is a circuit diagram of a single-phase electronic energy meter power supply of the present invention.
  • Figure 1 shows the circuit diagram of the commonly used single-phase electronic energy meter power supply, which is mainly composed of a power frequency transformer T1, a rectifier circuit D1, a filter capacitor C1, C2 and a three-terminal voltage regulator circuit.
  • the power supply circuit of the structure is very structured. Simple, but the grid requirements are very high, the normal working range can only be between 85V-280V, however, some users who use single-phase electronic energy meter metering are still working below 85V, which causes the loss of electricity costs. .
  • FIG. 2 is a block diagram showing the working principle of the single-phase electronic energy meter power supply of the present invention, the main power frequency circuit transformer T1, the full bridge rectifier circuit D1, the filter circuit C1, the sampling control circuit, the switch circuit SW1, the step-down DC/DC circuit.
  • the secondary winding of the power frequency transformer T1 is connected to the rectifier bridge D1, after being filtered by the capacitor C1, one is connected with the sampling control circuit, and the sampling control circuit controls the switch
  • the circuit SW1 is turned on and off, and the two ends of the switch circuit SW1 are respectively electrically connected to the input end and the output end of the step-down DC/DC circuit; the other end of the C1 output is directly connected to the step-down DC/DC circuit, and the step-down DC/DC is stepped down.
  • the circuit outputs to the step-up DC/DC circuit.
  • Vin is AC power, input from power frequency transformer T1, after D1 rectification, C1 filtering, the voltage is V1, V1 voltage is monitored by the sampling control circuit, and the monitoring voltage is the normal output V2 of the step-down DC/DC circuit.
  • the minimum required input voltage varies depending on the selected step-down DC/DC circuit.
  • the integrated chip of the step-down DC/DC circuit adopts DS34063 (consistent with the drawing).
  • V2 is 12V
  • the sampling control circuit selects 13V as the monitoring voltage value.
  • Vin is lowered, V1 is lowered.
  • the sampling control circuit When the voltage of V1 is lower than the normal operating voltage of the step-down DC/DC circuit, the sampling control circuit operates, the control SW1 is closed, and the step-down DC/DC circuit is short-circuited to make it inoperative. At this time, only the booster circuit works.
  • Vin is reduced to 40V, V1 is already low, but after the booster circuit, the output voltage V3 can still be stabilized, and the output current of the V3 terminal is proportional to the instantaneous voltage of the V3 terminal.
  • FIG. 3 is a detailed circuit configuration diagram of the circuit.
  • the power supply realizes two isolated power supplies 5V and 12V, 5V is to supply power to the metering chip, 12V is to supply power to the CPU, of course, only one set of power supply can be used, and 5V can be obtained by dividing the voltage on the 12V power supply.
  • the 5V power supply the primary winding of the power frequency transformer TR401 is connected to the external power grid, the input end of the rectifier bridge BR101 is connected to a set of secondary windings of the power frequency transformer TR401, and the output end of the rectifier bridge BR101 is filtered by two capacitors C101 and C102 connected in parallel.
  • the integrated circuit block of the sampling control circuit adopts S-80825, the switch circuit SW1 is composed of a resistor R103, a triode T101, a clamp resistor R107 and a switch tube T102, and the switch tube T102 uses an N-channel MOS transistor A03400, wherein the resistor R103 is connected to one end of the sample.
  • the output end of the control circuit is connected to the base of the transistor T101, the emitter of the transistor T101 is connected to the output end of the step-up DC/DC circuit, and the collector is respectively connected to the end of the switch tube T102 and the clamp resistor R107, and the clamp resistor
  • the other end of the R107 is connected to the input end of the step-up DC/DC circuit, and the other end of the switch tube T102 is connected to the input end of the step-down DC/DC circuit.
  • the integrated chip of the step-down DC/DC circuit adopts DS34063; the integrated chip of the step-up DC/DC circuit adopts HT7750, and the output of the step-up DC/DC circuit is 5V VCC DC.
  • the input terminal of the rectifier bridge BR401 is connected to another set of secondary windings of the power frequency transformer TR401.
  • the output end of the rectifier bridge BR401 is filtered by two capacitors C403 and C403 connected in parallel, and the integrated circuit block of the sampling control circuit adopts S- 80860, the switch circuit SW1 is composed of a resistor R453, a triode T401, a clamp resistor R457 and a switch tube T402.
  • the switch tube T402 uses an N-channel MOS transistor A03400, wherein one end of the resistor R453 is connected to the output end of the sampling integrated circuit, and the other end is connected to the triode T401.
  • the base of the transistor T401 is connected to the output of the step-up DC/DC circuit, the collector is connected to one end of the switch tube T402 and the clamp resistor R457, and the other end of the clamp resistor R457 is connected to the input of the step-up DC/DC circuit.
  • the other end of the switch tube T402 is connected to the input end of the step-down DC/DC circuit.
  • the integrated chip of the step-down DC/DC circuit adopts MC34063; the integrated chip of the step-up DC/DC circuit adopts SC4501, and the output of the step-up DC/DC circuit is 12V VDD DC.
  • the power-frequency transformer TR401 used above has a primary to secondary ratio of 220:15:15, that is, the output of both secondary sides is 15V when the AC 220V input is used.

Abstract

A power supply of a single-phase electronic electric energy meter, comprising an industrial frequency transformer (T1), a rectifier circuit (D1), a filter circuit (C1), a sampling control circuit, a switch circuit (SW1), a step-down DC/DC circuit and a boost DC/DC circuit. An industrial frequency alternating current Vin, after being subjected to voltage step-down via the industrial frequency transformer, passes through the rectifier circuit and the filter circuit and generates a direct current voltage V1 at a direct current voltage end; the direct current voltage end is directly connected to an input end of the step-down DC/DC circuit; the step-down DC/DC circuit outputs a direct current voltage V2 and inputs same to the boost DC/DC circuit; and an output end of the boost DC/DC circuit provides a stable working power supply for a CPU and a measurement chip of the electric energy meter. One end of the sampling control circuit is connected to the direct current voltage end, and the other end is connected to a control end of the switch circuit; and an input end and an output end of the switch circuit are respectively connected to the input end and an output end of the step-down DC/DC circuit. The direct current voltage V1 can be connected to the boost DC/DC circuit via the switch circuit to enable an output voltage V3 of the output end of the boost DC/DC circuit to remain stable; and a current output by the output end of the boost DC/DC circuit is proportional to an instantaneous voltage output by the output end of the boost DC/DC circuit.

Description

单相电子式电能表电源Single-phase electronic energy meter power supply
【技术领域】[Technical Field]
本发明属于电子测量仪表制造领域，具体涉及一种单相电子式电能表电源。The invention belongs to the field of electronic measuring instrument manufacturing, and in particular relates to a single-phase electronic energy meter power supply.
【背景技术】【Background technique】
现有的单相电子电能表的电源电路多采用工频变压器加线性稳压电路(如图1所示)，工作范围在85V-280V之间。因为没有使用开关电源，工作相对可靠，所以这种电路或相似电路在单相电子电能表中广泛使用。然而这种电路对电网要求很高，在电网波动很大的落后地区，采用这种电路的单相电子电能表经常不能工作，造成电费的流失。为了克服上述问题，方案之一是采用开关电源方案，如中国实用新型专利公开的专利号为：02271250.X、名称为“具有宽输入电压范围的开关电源”的技术方案，该开关电源披露的电路结构主要由控制芯片、变压器、电子开关、控制芯片的启动电路和电压反馈电路、整流滤波电路、稳压电路组成，采用该开关电源的电能表，其电能表的工作范围有所扩大。但是在低压时，需要启动电路的电容作间歇性的充电、放电使控制芯片工作，进而控制电子开关的通断，因此可靠性降低。方案之二是在稳压电路上做了改进，经工频变压器降压后，继而用TPIC74100芯片稳压，该技术采用MOS管进行升降压拓扑切换实现，该电路设计使其电能表也能实现低于85V的工作电压，但是TPIC74100芯片价格昂贵，不便于推广。The power supply circuit of the existing single-phase electronic energy meter mostly adopts a power frequency transformer and a linear voltage stabilization circuit (as shown in FIG. 1 ), and the working range is between 85V and 280V. This circuit or similar circuit is widely used in single-phase electronic energy meters because it does not use a switching power supply and is relatively reliable. However, this kind of circuit has high requirements on the power grid. In the backward areas where the power grid fluctuates greatly, single-phase electronic energy meters using such circuits often cannot work, resulting in the loss of electricity costs. In order to overcome the above problems, one of the solutions is to adopt a switching power supply scheme, such as the patent number disclosed in the Chinese utility model patent: 02271250.X, the technical solution named "switching power supply with a wide input voltage range", disclosed by the switching power supply The circuit structure is mainly composed of a control chip, a transformer, an electronic switch, a start circuit of a control chip, a voltage feedback circuit, a rectification filter circuit, and a voltage stabilization circuit. The power meter of the switching power supply is used, and the working range of the electric energy meter is expanded. However, at low voltage, the capacitor of the starting circuit needs to be intermittently charged and discharged to operate the control chip, thereby controlling the on and off of the electronic switch, so the reliability is lowered. The second scheme is to improve on the voltage regulator circuit. After the power frequency transformer is stepped down, the TPIC74100 chip is used to stabilize the voltage. This technology uses MOS tube to realize the buck-boost topology switching. The circuit design allows the energy meter to also Achieving operating voltages below 85V, but the TPIC74100 chip is expensive and inconvenient to promote.
【发明内容】 [Summary of the Invention]
基于此，有必要提供一种工作性能稳定，电能表工作范围要远低于85V，可以达到40V以下，且生产成本低的单相电子式电能表电源。Based on this, it is necessary to provide a single-phase electronic energy meter power supply with stable working performance, the working range of the electric energy meter is much lower than 85V, can reach 40V or less, and the production cost is low.
一种单相电子式电能表电源，包括工频变压器T1、整流电路D1、滤波电路C1、采样控制电路、开关电路SW1、降压DC/DC电路及升压DC/DC电路，工频交流电Vin经工频变压器T1降压后再通过整流电路D1和滤波电路C1得到直流电压端V1，V1端直接与降压DC/DC电路的输入端连接，降压DC/DC电路输出直流电V2给升压DC/DC电路，升压DC/DC电路输出端V3对电能表的CPU和计量芯片提供稳定的工作电源；采样控制电路的一端与V1端相连，另一端与开关电路SW1的控制端相连，开关电路SW1的输入、输出端与降压DC/DC电路的输入、输出端分别相连；其中，当V1端电压满足降压DC/DC电路的正常输入电压时，采样控制电路输出控制信号使开关电路SW1断开；当V1端电压低于降压DC/DC电路的正常输入电压时，采样控制电路输出控制信号触发开关电路SW1闭合，降压DC/DC电路被短接，V1端电压通过开关电路SW1与升压DC/DC电路连接，使V3电源保持稳定，V3电源输出的电流与V3电源的瞬时电压成正比。Single-phase electronic energy meter power supply, comprising power frequency transformer T1, rectifier circuit D1, filter circuit C1, sampling control circuit, switch circuit SW1, step-down DC/DC circuit and step-up DC/DC circuit, power frequency alternating current Vin After the power frequency transformer T1 is stepped down, the DC voltage terminal V1 is obtained through the rectifier circuit D1 and the filter circuit C1. The V1 terminal is directly connected to the input terminal of the step-down DC/DC circuit, and the step-down DC/DC circuit outputs the DC power V2 to the booster. The DC/DC circuit, the output terminal V3 of the step-up DC/DC circuit provides a stable working power to the CPU and the metering chip of the electric energy meter; one end of the sampling control circuit is connected to the V1 end, and the other end is connected to the control end of the switch circuit SW1, the switch The input and output ends of the circuit SW1 are respectively connected to the input and output ends of the step-down DC/DC circuit; wherein, when the voltage of the V1 terminal satisfies the normal input voltage of the step-down DC/DC circuit, the sampling control circuit outputs a control signal to make the switch circuit SW1 is disconnected; when the voltage of the V1 terminal is lower than the normal input voltage of the step-down DC/DC circuit, the sampling control circuit outputs a control signal to trigger the switch circuit SW1 to be closed, the step-down DC/DC circuit is short-circuited, and the voltage of the V1 terminal passes through the switch circuit. S W1 is connected to the step-up DC/DC circuit to keep the V3 power supply stable. The current output from the V3 power supply is proportional to the instantaneous voltage of the V3 power supply.
开关电路SW1由电阻、三极管、钳位电阻及开关管组成，电阻一端接采样控制电路的输出端，另一端接三极管的基极，三极管的发射极接升压DC/DC电路的输出端，集电极分别接开关管和钳位电阻的一端，钳位电阻另一端接升压DC/DC电路的输入端，开关管另一端接降压DC/DC电路的输入端。The switch circuit SW1 is composed of a resistor, a triode, a clamp resistor and a switch tube. One end of the resistor is connected to the output end of the sampling control circuit, and the other end is connected to the base of the triode. The emitter of the triode is connected to the output end of the step-up DC/DC circuit. The electrodes are respectively connected to one end of the switch tube and the clamp resistor, and the other end of the clamp resistor is connected to the input end of the step-up DC/DC circuit, and the other end of the switch tube is connected to the input end of the step-down DC/DC circuit.
在降压DC/DC电路的输入、输出端并联接入一开关电路SW1，开关电路SW1通过采样控制电路控制其通断，当V2为降压DC/DC电路正常工作电压时，降压DC/DC电路工作，对V1进行降压后再经升压DC/DC电路升压后得到稳定的电源表工作电源，当V2低于正常工作电压时，采样控制电路输出控制信号触发开关电路SW1的三极管导通，三极管的集电极再触发开关管导通，使降压DC/DC电路短接，V1端直接与升压DC/DC电路电连接，使V3电源保持稳定。经过测试该电路能够满足单相电子电能表AC40-400V的电源要求，而且整个方案成本不高，可靠性高、电源电压可以自由设定。A switching circuit SW1 is connected in parallel to the input and output terminals of the step-down DC/DC circuit, and the switching circuit SW1 controls its on/off through the sampling control circuit. When V2 is the normal working voltage of the step-down DC/DC circuit, the step-down DC/ The DC circuit works, and the V1 is stepped down and then boosted by the step-up DC/DC circuit to obtain a stable power supply operating power. When V2 is lower than the normal working voltage, the sampling control circuit outputs a control signal to trigger the triode of the switch circuit SW1. When turned on, the collector of the triode triggers the switch to conduct, so that the step-down DC/DC circuit is short-circuited, and the V1 terminal is directly connected to the step-up DC/DC circuit to make the V3 power supply stable. After testing, the circuit can meet the power requirements of the single-phase electronic energy meter AC40-400V, and the overall solution cost is not high, the reliability is high, and the power supply voltage can be freely set.
【附图说明】[Description of the Drawings]
图1为采用线性稳压电路的电源工作原理方框图；Figure 1 is a block diagram showing the operation of a power supply using a linear regulator circuit;
图2为本发明单相电子式电能表电源工作原理方框图；及2 is a block diagram showing the working principle of a single-phase electronic energy meter power supply according to the present invention;
图3为本发明单相电子式电能表电源的电路图。3 is a circuit diagram of a single-phase electronic energy meter power supply of the present invention.
【具体实施方式】 【detailed description】
下面结合附图对本发明单相电子式电能表电源的具体实施方式作进一步详细说明。The specific implementation manner of the single-phase electronic energy meter power supply of the present invention will be further described in detail below with reference to the accompanying drawings.
图1所示为目前常用的单相电子式电能表电源的电路图，主要由工频变压器T1、整流电路D1、滤波电容C1、C2以及三端稳压电路组成，该结构的电源电路，结构非常简单，但对电网要求很高，正常工作范围只能在85V-280V之间，然而使用单相电子式电能表计量的用户的有些用电设备在85V以下仍在工作，这就造成电费的流失。Figure 1 shows the circuit diagram of the commonly used single-phase electronic energy meter power supply, which is mainly composed of a power frequency transformer T1, a rectifier circuit D1, a filter capacitor C1, C2 and a three-terminal voltage regulator circuit. The power supply circuit of the structure is very structured. Simple, but the grid requirements are very high, the normal working range can only be between 85V-280V, however, some users who use single-phase electronic energy meter metering are still working below 85V, which causes the loss of electricity costs. .
图2所示为本发明单相电子式电能表电源工作原理方框图，电源电路主要工频变压器T1、全桥整流电路D1、滤波电路C1、采样控制电路、开关电路SW1、降压DC/DC电路及升压DC/DC电路组成，各组成部分的特征及相互关系如下：工频变压器T1次级绕组连接到整流桥D1，经过电容C1滤波后，一路与采样控制电路相连，采样控制电路控制开关电路SW1的导通与关断，开关电路SW1两端分别与降压DC/DC电路的输入端、输出端电连接；C1输出另一路直接与降压DC/DC电路相连，降压DC/DC电路输出给升压DC/DC电路。其工作原理如下：Vin为交流电，从工频变压器T1输入，经过D1整流、C1滤波后电压为V1，V1电压受到采样控制电路的监控，监控电压为降压DC/DC电路正常输出V2时所必须的最小输入电压，根据选择的降压DC/DC电路的不同，其值有所不同。以实际电路图3为例，降压DC/DC电路的集成芯片采用DS34063(与附图一致)，V2为12V时，采样控制电路选择13V为监控电压值。Vin降低时，V1降低，V1的电压低于降压DC/DC电路正常工作电压时，采样控制电路动作，控制SW1闭合，短接了降压DC/DC电路，使其不起作用。此时只有升压电路工作，Vin降低到40V时，V1已经很低，但是经过升压电路，仍然可以稳定输出电压V3，V3端输出的电流与V3端的瞬时电压成正比。2 is a block diagram showing the working principle of the single-phase electronic energy meter power supply of the present invention, the main power frequency circuit transformer T1, the full bridge rectifier circuit D1, the filter circuit C1, the sampling control circuit, the switch circuit SW1, the step-down DC/DC circuit. And the step-up DC/DC circuit composition, the characteristics of each component and the relationship are as follows: the secondary winding of the power frequency transformer T1 is connected to the rectifier bridge D1, after being filtered by the capacitor C1, one is connected with the sampling control circuit, and the sampling control circuit controls the switch The circuit SW1 is turned on and off, and the two ends of the switch circuit SW1 are respectively electrically connected to the input end and the output end of the step-down DC/DC circuit; the other end of the C1 output is directly connected to the step-down DC/DC circuit, and the step-down DC/DC is stepped down. The circuit outputs to the step-up DC/DC circuit. The working principle is as follows: Vin is AC power, input from power frequency transformer T1, after D1 rectification, C1 filtering, the voltage is V1, V1 voltage is monitored by the sampling control circuit, and the monitoring voltage is the normal output V2 of the step-down DC/DC circuit. The minimum required input voltage varies depending on the selected step-down DC/DC circuit. Taking the actual circuit diagram 3 as an example, the integrated chip of the step-down DC/DC circuit adopts DS34063 (consistent with the drawing). When V2 is 12V, the sampling control circuit selects 13V as the monitoring voltage value. When Vin is lowered, V1 is lowered. When the voltage of V1 is lower than the normal operating voltage of the step-down DC/DC circuit, the sampling control circuit operates, the control SW1 is closed, and the step-down DC/DC circuit is short-circuited to make it inoperative. At this time, only the booster circuit works. When Vin is reduced to 40V, V1 is already low, but after the booster circuit, the output voltage V3 can still be stabilized, and the output current of the V3 terminal is proportional to the instantaneous voltage of the V3 terminal.
图3为该电路的详细电路结构图。该电源实现两路隔离电源5V和12V，5V是给计量芯片供电，12V是给CPU供电，当然也可只采用一组电源供电，5V可在12V电源上分压取得。其中5V电源：工频变压器TR401的初级绕组接外部电网，整流桥BR101的输入端接工频变压器TR401的一组次级绕组，整流桥BR101的输出端由两个并联连接的电容C101、C102滤波，采样控制电路的集成电路块采用S-80825，开关电路SW1由电阻R103、三极管T101、钳位电阻R107及开关管T102组成，开关管T102使用N沟道MOS管A03400，其中电阻R103一端接采样控控制电路的输出端，另一端接三极管T101的基极，三极管T101的发射极接升压DC/DC电路的输出端，集电极分别接开关管T102和钳位电阻R107的一端，钳位电阻R107另一端接升压DC/DC电路的输入端，开关管T102另一端接降压DC/DC电路的输入端。降压DC/DC电路的集成芯片采用DS34063；升压DC/DC电路的集成芯片采用HT7750，其升压DC/DC电路输出为5V的VCC直流电。Figure 3 is a detailed circuit configuration diagram of the circuit. The power supply realizes two isolated power supplies 5V and 12V, 5V is to supply power to the metering chip, 12V is to supply power to the CPU, of course, only one set of power supply can be used, and 5V can be obtained by dividing the voltage on the 12V power supply. The 5V power supply: the primary winding of the power frequency transformer TR401 is connected to the external power grid, the input end of the rectifier bridge BR101 is connected to a set of secondary windings of the power frequency transformer TR401, and the output end of the rectifier bridge BR101 is filtered by two capacitors C101 and C102 connected in parallel. The integrated circuit block of the sampling control circuit adopts S-80825, the switch circuit SW1 is composed of a resistor R103, a triode T101, a clamp resistor R107 and a switch tube T102, and the switch tube T102 uses an N-channel MOS transistor A03400, wherein the resistor R103 is connected to one end of the sample. The output end of the control circuit is connected to the base of the transistor T101, the emitter of the transistor T101 is connected to the output end of the step-up DC/DC circuit, and the collector is respectively connected to the end of the switch tube T102 and the clamp resistor R107, and the clamp resistor The other end of the R107 is connected to the input end of the step-up DC/DC circuit, and the other end of the switch tube T102 is connected to the input end of the step-down DC/DC circuit. The integrated chip of the step-down DC/DC circuit adopts DS34063; the integrated chip of the step-up DC/DC circuit adopts HT7750, and the output of the step-up DC/DC circuit is 5V VCC DC.
12V电源：整流桥BR401的输入端接工频变压器TR401的另一组次级绕组，整流桥BR401的输出端由两个并联连接的电容C403、C403滤波，采样控制电路的集成电路块采用S-80860，开关电路SW1由电阻R453、三极管T401、钳位电阻R457及开关管T402组成，开关管T402使用N沟道MOS管A03400，其中电阻R453一端接采样集成电路的输出端，另一端接三极管T401的基极，三极管T401的发射极接升压DC/DC电路的输出端，集电极分别接开关管T402和钳位电阻R457的一端，钳位电阻R457另一端接升压DC/DC电路的输入端，开关管T402另一端接降压DC/DC电路的输入端。降压DC/DC电路的集成芯片采用MC34063；升压DC/DC电路的集成芯片采用SC4501，其升压DC/DC电路输出为12V的VDD直流电。12V power supply: the input terminal of the rectifier bridge BR401 is connected to another set of secondary windings of the power frequency transformer TR401. The output end of the rectifier bridge BR401 is filtered by two capacitors C403 and C403 connected in parallel, and the integrated circuit block of the sampling control circuit adopts S- 80860, the switch circuit SW1 is composed of a resistor R453, a triode T401, a clamp resistor R457 and a switch tube T402. The switch tube T402 uses an N-channel MOS transistor A03400, wherein one end of the resistor R453 is connected to the output end of the sampling integrated circuit, and the other end is connected to the triode T401. The base of the transistor T401 is connected to the output of the step-up DC/DC circuit, the collector is connected to one end of the switch tube T402 and the clamp resistor R457, and the other end of the clamp resistor R457 is connected to the input of the step-up DC/DC circuit. At the end, the other end of the switch tube T402 is connected to the input end of the step-down DC/DC circuit. The integrated chip of the step-down DC/DC circuit adopts MC34063; the integrated chip of the step-up DC/DC circuit adopts SC4501, and the output of the step-up DC/DC circuit is 12V VDD DC.
上述使用的工频变压器TR401原副边比为220∶15∶15，即两个副边在交流220V输入时输出都为15V。The power-frequency transformer TR401 used above has a primary to secondary ratio of 220:15:15, that is, the output of both secondary sides is 15V when the AC 220V input is used.

Claims (2)

  1. 一种单相电子式电能表电源，其特征在于：包括工频变压器（T1）、整流电路（D1）、滤波电路（C1）、采样控制电路、开关电路（SW1）、降压DC/DC电路及升压DC/DC电路，工频交流电Vin经所述工频变压器（T1）降压后再通过所述整流电路（D1）和所述滤波电路（C1）得到直流电压端V1，V1端直接与所述降压DC/DC电路的输入端连接，所述降压DC/DC电路输出直流电V2给所述升压DC/DC电路，所述升压DC/DC电路输出端V3对电能表的CPU和计量芯片提供稳定的工作电源；所述采样控制电路的一端与V1端相连，另一端与所述开关电路（SW1）的控制端相连，所述开关电路（SW1）的输入、输出端与所述降压DC/DC电路的输入、输出端分别相连；其中，当V1端电压满足所述降压DC/DC电路的正常输入电压时，所述采样控制电路输出控制信号使所述开关电路（SW1）断开；当V1端电压低于所述降压DC/DC电路的正常输入电压时，所述采样控制电路输出控制信号触发所述开关电路（SW1）闭合，所述降压DC/DC电路被短接，V1端电压通过所述开关电路（SW1）与所述升压DC/DC电路连接，使V3电源保持稳定，V3电源输出的电流与V3电源的瞬时电压成正比。A single-phase electronic energy meter power supply, comprising: a power frequency transformer (T1), a rectifier circuit (D1), a filter circuit (C1), a sampling control circuit, a switch circuit (SW1), a step-down DC/DC circuit And a step-up DC/DC circuit, the power frequency alternating current Vin is stepped down by the power frequency transformer (T1), and then the DC voltage terminal V1 is obtained through the rectifier circuit (D1) and the filter circuit (C1), and the V1 terminal is directly Connected to an input terminal of the step-down DC/DC circuit, the step-down DC/DC circuit outputs a direct current V2 to the step-up DC/DC circuit, and the step-up DC/DC circuit output terminal V3 to the electric energy meter The CPU and the metering chip provide a stable working power supply; one end of the sampling control circuit is connected to the V1 end, and the other end is connected to the control end of the switch circuit (SW1), and the input and output ends of the switch circuit (SW1) are The input and output ends of the step-down DC/DC circuit are respectively connected; wherein, when the V1 terminal voltage satisfies a normal input voltage of the step-down DC/DC circuit, the sampling control circuit outputs a control signal to cause the switch circuit (SW1) is disconnected; when the V1 terminal voltage is lower than the above When the normal input voltage of the DC/DC circuit is pressed, the sampling control circuit outputs a control signal to trigger the switching circuit (SW1) to be closed, the step-down DC/DC circuit is short-circuited, and the V1 terminal voltage passes through the switching circuit ( SW1) is connected to the step-up DC/DC circuit to keep the V3 power supply stable, and the current output by the V3 power supply is proportional to the instantaneous voltage of the V3 power supply.
  2. 根据权利要求1所述的单相电子式电能表电源，其特征在于：所述开关电路(SW1)由电阻、三极管、钳位电阻及开关管组成，所述电阻一端接所述采样控制电路的输出端，另一端接所述三极管的基极，所述三极管的发射极接所述升压DC/DC电路的输出端，集电极分别接所述开关管和所述钳位电阻的一端，所述钳位电阻另一端接所述升压DC/DC电路的输入端，所述开关管另一端接所述降压DC/DC电路的输入端。The single-phase electronic energy meter power supply according to claim 1, wherein the switch circuit (SW1) is composed of a resistor, a triode, a clamp resistor and a switch tube, and the resistor is connected to the sampling control circuit at one end. The other end is connected to the base of the triode, the emitter of the triode is connected to the output end of the step-up DC/DC circuit, and the collector is respectively connected to the switch tube and one end of the clamp resistor. The other end of the clamp resistor is connected to the input of the step-up DC/DC circuit, and the other end of the switch is connected to the input of the step-down DC/DC circuit.
PCT/CN2015/088037 2015-08-25 2015-08-25 Power supply of single-phase electronic electric energy meter WO2017031694A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2015/088037 WO2017031694A1 (en) 2015-08-25 2015-08-25 Power supply of single-phase electronic electric energy meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2015/088037 WO2017031694A1 (en) 2015-08-25 2015-08-25 Power supply of single-phase electronic electric energy meter

Publications (1)

Publication Number Publication Date
WO2017031694A1 true WO2017031694A1 (en) 2017-03-02

Family

ID=58099406

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/088037 WO2017031694A1 (en) 2015-08-25 2015-08-25 Power supply of single-phase electronic electric energy meter

Country Status (1)

Country Link
WO (1) WO2017031694A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL422457A1 (en) * 2017-08-07 2019-02-11 APATOR Spółka Akcyjna Feed system, preferably in electric energy meters
CN110083447A (en) * 2019-04-26 2019-08-02 宁波三星医疗电气股份有限公司 A kind of interruption processing method and system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101562403A (en) * 2008-04-17 2009-10-21 深圳市思达仪表有限公司 Single-phase electronic type electric energy meter electric source
CN202160098U (en) * 2011-07-08 2012-03-07 江苏林洋电子股份有限公司 Switch power supply circuit for three-phase intelligent electric energy meter
CN202443066U (en) * 2012-02-16 2012-09-19 南车株洲电力机车有限公司 DC (direct current) bidirectional measurement electric energy meter
CN102798756A (en) * 2012-06-27 2012-11-28 华立仪表集团股份有限公司 Power supply circuit for intelligent electricity meter and three-phase intelligent electricity meter
US9110108B2 (en) * 2012-05-04 2015-08-18 Landis+Gyr, Inc. Power management arrangement and method in a utility meter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101562403A (en) * 2008-04-17 2009-10-21 深圳市思达仪表有限公司 Single-phase electronic type electric energy meter electric source
CN202160098U (en) * 2011-07-08 2012-03-07 江苏林洋电子股份有限公司 Switch power supply circuit for three-phase intelligent electric energy meter
CN202443066U (en) * 2012-02-16 2012-09-19 南车株洲电力机车有限公司 DC (direct current) bidirectional measurement electric energy meter
US9110108B2 (en) * 2012-05-04 2015-08-18 Landis+Gyr, Inc. Power management arrangement and method in a utility meter
CN102798756A (en) * 2012-06-27 2012-11-28 华立仪表集团股份有限公司 Power supply circuit for intelligent electricity meter and three-phase intelligent electricity meter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL422457A1 (en) * 2017-08-07 2019-02-11 APATOR Spółka Akcyjna Feed system, preferably in electric energy meters
CN110083447A (en) * 2019-04-26 2019-08-02 宁波三星医疗电气股份有限公司 A kind of interruption processing method and system

Similar Documents

Publication Publication Date Title
CN105992435B (en) Anti-interference LED overvoltage protective module and anti-interference LED overvoltage protective system
CN101562403B (en) Single-phase electronic type electric energy meter electric source
CN101873068A (en) General integration technology for realizing high efficiency of linear power supply
CN103052240A (en) High-power factor light-emitting diode driving circuit structure
CN104578843A (en) Filter circuit of AC/DC (alternating current/direct current) switching converter
CN104302053A (en) LED constant current source output detection control circuit and control method thereof
CN102957324A (en) Power detection circuit
CN104159355A (en) LED drive circuit, and control circuit and control method of LED drive circuit
CN103547041B (en) Led drive circuit
CN104578729A (en) Input filtering method and AC/DC switching converter using same
WO2017031694A1 (en) Power supply of single-phase electronic electric energy meter
CN203883691U (en) Current zero-crossing point detection circuit, drive circuit, and switching power supply
CN105071652A (en) Control Boost PFC circuit
CN204794736U (en) Novel half -wave rectifier circuit
CN204068742U (en) Low-power power adapter drive circuit
CN106405204A (en) Voltage alarm circuit used for computer
CN106714385A (en) Internal step-down circuit structure of LED driving power source
CN209105035U (en) A kind of DC-DC decompression isolation circuit
CN104348351B (en) Synchronous switch circuit for PFC (power factor correction)
CN103138606A (en) Energy conservation type switch power source
CN203554763U (en) LED power supply with BOOST and FLYBACK integrated therein
CN206433226U (en) A kind of internal stepdown circuit of LED drive power
CN202488366U (en) Energy-saving ultra-small switch power supply for plug and socket with electronic circuit
TWI416127B (en) Power input efficiency measurement method
CN203102061U (en) Voltage stabilizer with auto-transformer

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15901965

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15901965

Country of ref document: EP

Kind code of ref document: A1