CN105319437A - Direct-current power sampling system - Google Patents

Direct-current power sampling system Download PDF

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Publication number
CN105319437A
CN105319437A CN201410381882.0A CN201410381882A CN105319437A CN 105319437 A CN105319437 A CN 105319437A CN 201410381882 A CN201410381882 A CN 201410381882A CN 105319437 A CN105319437 A CN 105319437A
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CN
China
Prior art keywords
disconnector
smooth
voltage
collection circuit
sampling system
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN201410381882.0A
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Chinese (zh)
Inventor
李香龙
刘秀兰
曾爽
焦东升
陈建树
栾逢时
关宇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
State Grid Beijing Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
State Grid Beijing Electric Power Co Ltd
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 State Grid Corp of China SGCC, State Grid Beijing Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201410381882.0A priority Critical patent/CN105319437A/en
Publication of CN105319437A publication Critical patent/CN105319437A/en
Pending legal-status Critical Current

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Abstract

The present invention discloses a direct-current power sampling system. The direct-current power sampling system comprises a first optical isolation switch arranged in a voltage acquisition circuit and configured to turn on the voltage acquisition circuit when the first optical isolation switch is switched on; a second optical isolation switch arranged in a current acquisition circuit and configured to turn on the current acquisition circuit when the first optical isolation switch is switched on; a digital signal processor configured to control synchronization switching of the first optical isolation switch and the second optical isolation switch; and a field-programmable gate array connected with the digital signal processor, the first optical isolation switch and the second optical isolation switch and configured to turn on the voltage acquisition circuit and the current acquisition circuit at the same time when the first optical isolation switch and the second optical isolation switch are switched on. According to the invention, the problem of non-synchronous acquisition of voltage data and current data at the measurement of groups of cells in the prior art is solved, and the effect of synchronous acquisition of voltage data and current data is achieved.

Description

DC power sampling system
Technical field
The present invention relates to field tests, in particular to a kind of DC power sampling system.
Background technology
Battery producer is when testing stack battery, need the metering module of they series connection being carried out to electric discharge total voltage, electric discharge total current, discharge power, electric discharge ampere-hour and electric discharge watt-hour, thus as the foundation to cell integrated performance and behaviour in service assessment.On the other hand, the charging equipment as battery also needs the parameter measuring charging total voltage, charging total current, charge power, charging ampere-hour and charging watt-hour, as the feedback quantity of charging control strategy or the content of industrial computer and host computer display.
Current stack battery testing apparatus is asynchronous when measuring total voltage and total current, causes measurement data inconsistent, thus cannot the virtual condition of actual response stack battery according to the data of voltage and current rated output and watt-hour.On the other hand, because the number change scope of stack battery series connection is very large, cause the total voltage fluctuation range needing stack battery wide, and existing testing apparatus is difficult to reach high precision within the scope of gamut in wide-voltage range, even can not measure wide-voltage range.In addition, owing to relating to high pressure, the occasion of big current all will carry out isolation design, and the electrical isolation design of conventional sample circuit and control circuit is complicated, and link is numerous, have impact on the linearity of measurement, destroys the measuring accuracy of existing A/D chip.
Gathering voltage data and the nonsynchronous problem of current data for carrying out in prior art when stack battery is measured, not yet proposing effective solution at present.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of DC power sampling system, carries out gathering voltage data and current data nonsynchronous problem when stack battery is measured to solve in prior art.
To achieve these goals, according to an aspect of the present invention, a kind of DC power sampling system is provided.DC power sampling system according to the present invention comprises: the first smooth disconnector, is arranged in voltage collection circuit, for connecting described voltage collection circuit when opening; Second smooth disconnector, is arranged in current collection circuit, for connecting described current collection circuit when opening; Digital signal processor, for controlling described first smooth disconnector and described second smooth disconnector is synchronously opened; And field programmable gate array (FPGA), be connected with described digital signal processor, all be connected with described first smooth disconnector and described second smooth disconnector, for connecting described voltage collection circuit and described current collection circuit when described first smooth disconnector and described second smooth disconnector are all opened simultaneously, make described voltage collection circuit gather voltage data, and make described current collection circuit gather current data.
Further, described digital signal processor is also for obtaining the product of described voltage data and current data as sampled power.
Further, described digital signal processor also for carrying out integration to voltage according to described sampled power getting in predetermined amount of time, obtains ampere-hour, or, within a predetermined period of time integral and calculating is carried out to electric current according to described sampled power, obtain watt-hour.
Further, described DC power sampling system also comprises: storage unit, is connected with described digital signal processor processes device, for the described voltage data of storage of collected, described current data, described sampled power and described ampere-hour and described watt-hour.
Further, described voltage collection circuit comprises divider resistance controller, and described divider resistance controller is connected with described first smooth disconnector, for when described first smooth disconnector is opened, realizes switching the stepping of voltage collection circuit; And described current collection circuit comprises difference amplifier controller, described difference amplifier controller is connected with described second smooth disconnector, for when described second smooth disconnector is opened, realizes switching the stepping of current collection circuit.
Further, described voltage collection circuit also comprises the first modulator, and described first modulator is connected between described divider resistance controller and described field programmable gate array, for gathering voltage data when described first smooth disconnector is opened; And described current collection circuit also comprises the second modulator, described second modulator is connected between described difference amplifier controller and described field programmable gate array, for gathering current data when described second smooth disconnector is opened.
Further, described DC power sampling system also comprises: isolated form can passage, is connected with described digital signal processor processes device, for the described voltage data gathered and/or described current data are sent to bus.
Further, described DC power sampling system also comprises: reset button, is connected with described digital signal processor processes device, for resetting when described system works is abnormal.
Further, described DC power sampling system also comprises: digital filter, is integrated in described field programmable gate array, for carrying out filtering to the voltage data gathered and/or current data.
Further, described digital filter is also for being converted to digital signal by the simulating signal collected.
By the present invention, adopt the first smooth disconnector, be arranged in voltage collection circuit, for the turn-on voltage Acquisition Circuit when opening; Second smooth disconnector, is arranged in current collection circuit, for the turn-on current Acquisition Circuit when opening; Digital signal processor, for controlling the first smooth disconnector and the second smooth disconnector is synchronously opened; And field programmable gate array (FPGA), be connected with digital signal processor, all be connected with the first smooth disconnector and the second smooth disconnector, for simultaneously turn-on voltage Acquisition Circuit and current collection circuit when the first smooth disconnector and the second smooth disconnector are all opened, voltage collection circuit is made to gather voltage data, and make current collection circuit gather current data, solve in prior art and carry out gathering voltage data and current data nonsynchronous problem when stack battery is measured, and then reach the effect of synchronous acquisition voltage data and current data.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the DC power sampling system according to the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in instructions of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
Embodiments provide a kind of DC power sampling system.
Fig. 1 is the schematic diagram of the DC power sampling system according to the embodiment of the present invention.Below in conjunction with Fig. 1, the DC power sampling system of the embodiment of the present invention is described.
First smooth disconnector 10 is arranged in voltage collection circuit, for the turn-on voltage Acquisition Circuit when opening.
Second smooth disconnector 20, is arranged in current collection circuit, for the turn-on current Acquisition Circuit when opening.
Digital signal processor 30 is for controlling the first smooth disconnector and the second smooth disconnector is synchronously opened.
Field programmable gate array 40 is connected with digital signal processor, all be connected with the first smooth disconnector and the second smooth disconnector, for simultaneously turn-on voltage Acquisition Circuit and current collection circuit when the first smooth disconnector and the second smooth disconnector are all opened, make voltage collection circuit gather voltage data, and make current collection circuit gather current data.
Digital signal processor 30 is connected with field programmable gate array (FPGA) 40, can control unlatching or the closedown of the first smooth disconnector 10 and the second smooth disconnector 20.When the first smooth disconnector 10 is opened, voltage collection circuit is connected, and can carry out voltage acquisition, and when the second smooth disconnector 20 is opened, current collection circuit is connected, and can carry out current acquisition.By controlling the synchronous unlatching of the first smooth disconnector 10 and the second smooth disconnector 20, current collection circuit and voltage collection circuit are synchronously gathered, now, can gather voltage data by field programmable gate array 40 control voltage Acquisition Circuit, and synchro control current collection circuit gathers current data.
By the synchronous unlatching of the smooth disconnector of DSP CONTROL first and the second smooth disconnector, voltage collection circuit gathers voltage data, and controls current collection circuit and gather current data.Open because digital signal processor can control two light disconnectores simultaneously, then field programmable gate array driving voltage Acquisition Circuit and current acquisition can gather current data and voltage data simultaneously respectively, thus solve in prior art the nonsynchronous problem of data carrying out gathering voltage and current when stack battery is measured, and then reach the effect of synchronous acquisition voltage and current data.
Preferably, digital signal processor is also for obtaining the product of voltage data and current data as sampled power.
Digital signal processor is connected with FPGA, and can obtain by parallel port control bus the voltage data and current data that collect from FPGA, the voltage data collected and current data are carried out product calculation by digital signal processor, obtain sampled power.
Preferably, digital signal processor also for carrying out integration to voltage according to sampled power getting in predetermined amount of time, obtains ampere-hour, or, within a predetermined period of time integral and calculating is carried out to electric current according to sampled power, obtain watt-hour.
The sampled power that calculates can also be calculated ampere-hour in predetermined amount of time or watt-hour by digital signal processor.Within a predetermined period of time integration is carried out to voltage, obtain ampere-hour, in the given time integration is carried out to electric current, obtain watt-hour.
Preferably, DC power sampling system also comprises: storage unit, is connected with digital signal processor processes device, for the voltage data of storage of collected, current data, sampled power and ampere-hour and watt-hour.
DC power sampling system also comprises storage unit 50, and storage unit can be EEPROM, and storage unit can voltage data, the current data of storage of collected, can also store the sampled power and the data such as ampere-hour, watt-hour that are calculated by digital signal processor 30.Accumulation can not only be carried out to historical data to preserve, power down obliterated data can also be prevented.
Preferably, voltage collection circuit comprises divider resistance controller, and divider resistance controller is connected with the first smooth disconnector, for when the first smooth disconnector is opened, realizes switching the stepping of voltage collection circuit; And current collection circuit comprises difference amplifier controller, difference amplifier controller is connected with the second smooth disconnector, for when the second smooth disconnector is opened, realizes switching the stepping of current collection circuit.
Divider resistance controller 60 is connected with the first smooth disconnector 10, is controlled the gear switch of divider resistance controller by the unlatching of the first smooth disconnector, and when the first smooth disconnector is opened, this divider resistance controller can gather voltage data.
Difference amplifier controller 70 is connected with the second smooth disconnector 20, is controlled the gear switch of difference amplifier controller by the unlatching of the second smooth disconnector, and when the second smooth disconnector is opened, this difference amplifier controller can gather current data.
Keep apart phototiming open by controlling the first smooth disconnector and the second light, control bleeder circuit controller and difference amplifier controller synchronous acquisition, bleeder circuit controller
Preferably, voltage collection circuit also comprises the first modulator 80, first modulator and is connected between divider resistance controller and field programmable gate array, for gathering voltage data when the first smooth disconnector is opened; And current collection circuit also comprises the second modulator, the second modulator 90 is connected between difference amplifier controller and field programmable gate array, for gathering current data when the second smooth disconnector is opened.
First modulator and the second modulator can be all isolated form second order es-△ modulators, synchronously sampling can be isolated to voltage, electric current, owing to relating to high pressure, the occasion of big current all will carry out isolation design, and therefore two isolated form second order es-△ modulators carry out isolation sampling respectively to voltage and current.First modulator and the second modulator obtain " 0 " " 1 " bit stream.
Because voltage collection circuit and current collection circuit are respectively two sample circuits, isolated form second order es-△ modulator in two sample circuits well can carry out again isolation sampling, therefore, do not need complicated isolation design just can realize the isolation of voltage acquisition and current acquisition, thus ensure the linearity of measurement, and then improve the precision of the sampled power that digital signal processor calculates.
Preferably, DC power sampling system also comprises: isolated form can path 10 0, is connected with digital signal processor 30, for the voltage data of collection and/or current data are sent to bus.
Digital signal processor can be got voltage data and current data etc. and send to bus by isolated form can passage, also the data such as the ampere-hour, watt-hour or other acquisition parameters that store in the memory unit can be sent to bus.
Preferably, DC power sampling system also comprises: reset button, is connected with digital signal processor, for resetting when system non-normal working.
Reset button can be that hardware is guarded the gate enough, can reset when this system is in abnormal operating state.
Preferably, DC power sampling system also comprises: digital filter, is integrated in field programmable gate array, for carrying out filtering to the voltage data gathered and/or current data.
Also be integrated with digital filter in programmable gate array 40 at the scene, " 0 " " 1 " bit stream that second order sigma-delta modulator gathers can be carried out FIR digital filtering by this digital filter, within the time that 21us is even shorter, calculate AD conversion value.
Preferably, digital filter is also for being converted to digital value by the analogue value collected.Digital filter can calculate AD conversion value within the time that 21us is even shorter.
The time due to digital filter the analogue value being converted to digital value is shorter, therefore, it is possible to meet the requirement of low pass to the quick response of Voltage loop and electric current loop, can improve the speed gathering voltage data and current data.
A kind of Width funtion that the above embodiment of the present invention proposes, big current high-precise synchronization isolation sampling AC power system, achieve wide-voltage range gamut error≤± 0.5V, electric current gamut coverage error≤± 0.1A, electric current and voltage synchronously isolates the validity of the sample power, ampere-hour and the watt-hour that ensure that calculating, reflect electric battery current state truly, wherein the error≤± 0.05W of power, when not calibrating, ampere-hour precision is 0.3%, and watt-hour precision is 0.5%.
Present invention achieves the high-acruracy survey of Width funtion, big current gamut scope inter-sync isolation sampling, and the calculating of high-precision power, ampere-hour and watt-hour by DSP algorithm realization.Be specially:
1. the synchronized sampling of FPGA control realization voltage, electric current is passed through;
2. by simplifying isolation design, the linear dependence of voltage, current actual value and AD value that the sample circuit of native system is measured reaches more than 0.999999%;
3. use digital signal processor to calculate sampled voltage, electric current, achieve accurate-metering and the real-time update of power, ampere-hour and watt-hour;
4. system meets high-precision requirement within the scope of Width funtion, big current gamut, and achieve the high precision of power, ampere-hour and watt-hour metering, index is as follows:
Error≤± 0.1A within the scope of error within the scope of 0-1000V gamut≤± 0.5V, 0-600A gamut, the error≤± 0.05W of power, when not calibrating, ampere-hour precision is 0.3%, and watt-hour precision is 0.5%;
5. system adopts DSP+FPGA as master controller, simultaneously simplify isolation design bring PCB to do very little, being low to moderate 21us and following sampling time meets the quick response requirement of system to Voltage loop and electric current loop, therefore conveniently can expand the control panel into AC-DC or DC-DC.
In the above embodiment of the present invention, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a DC power sampling system, is characterized in that, comprising:
First smooth disconnector, is arranged in voltage collection circuit, for connecting described voltage collection circuit when opening;
Second smooth disconnector, is arranged in current collection circuit, for connecting described current collection circuit when opening;
Digital signal processor, for controlling described first smooth disconnector and described second smooth disconnector is synchronously opened; And
Field programmable gate array, be connected with described digital signal processor, all be connected with described first smooth disconnector and described second smooth disconnector, for connecting described voltage collection circuit and described current collection circuit when described first smooth disconnector and described second smooth disconnector are all opened simultaneously, make described voltage collection circuit gather voltage data, and make described current collection circuit gather current data.
2. DC power sampling system according to claim 1, is characterized in that, described digital signal processor is also for obtaining the product of described voltage data and described current data as sampled power.
3. DC power sampling system according to claim 2, it is characterized in that, described digital signal processor is also for carrying out integration to voltage according to described sampled power getting in predetermined amount of time, obtain ampere-hour, or, within a predetermined period of time integral and calculating is carried out to electric current according to described sampled power, obtain watt-hour.
4. DC power sampling system according to claim 3, is characterized in that, described DC power sampling system also comprises:
Storage unit, is connected with described digital signal processor processes device, for the described voltage data of storage of collected, described current data, described sampled power and described ampere-hour and described watt-hour.
5. DC power sampling system according to claim 1, is characterized in that,
Described voltage collection circuit comprises divider resistance controller, and described divider resistance controller is connected with described first smooth disconnector, for when described first smooth disconnector is opened, realizes switching the stepping of voltage collection circuit; And
Described current collection circuit comprises difference amplifier controller, and described difference amplifier controller is connected with described second smooth disconnector, for when described second smooth disconnector is opened, realizes switching the stepping of current collection circuit.
6. DC power sampling system according to claim 5, is characterized in that,
Described voltage collection circuit also comprises the first modulator, and described first modulator is connected between described divider resistance controller and described field programmable gate array, for gathering voltage data when described first smooth disconnector is opened; And
Described current collection circuit also comprises the second modulator, and described second modulator is connected between described difference amplifier controller and described field programmable gate array, for gathering current data when described second smooth disconnector is opened.
7. DC power sampling system according to claim 1, is characterized in that, described DC power sampling system also comprises:
Isolated form can passage, is connected with described digital signal processor processes device, for the described voltage data gathered and/or described current data are sent to bus.
8. DC power sampling system according to claim 1, is characterized in that, described DC power sampling system also comprises:
Reset button, is connected with described digital signal processor processes device, for resetting when described system works is abnormal.
9. DC power sampling system according to claim 1, is characterized in that, described DC power sampling system also comprises:
Digital filter, is integrated in described field programmable gate array, for carrying out filtering to the voltage data gathered and/or current data.
10. DC power sampling system according to claim 9, is characterized in that, described digital filter is also for being converted to digital signal by the simulating signal collected.
CN201410381882.0A 2014-08-05 2014-08-05 Direct-current power sampling system Pending CN105319437A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106324319A (en) * 2016-08-02 2017-01-11 许继集团有限公司 Direct current voltage and direct current signal sampling circuit
CN108717140A (en) * 2018-08-29 2018-10-30 重庆金山科技(集团)有限公司 High frequency electric source equipment output power test device and test method

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CN103033682A (en) * 2012-11-12 2013-04-10 浙江涵普电力科技有限公司 High-precision three-phase power meter and metering method thereof
CN103091550A (en) * 2013-01-08 2013-05-08 北京优科利尔能源设备有限公司 Synchronous isolation sampling direct-current power meter of wide voltage and large current
CN203012011U (en) * 2013-01-14 2013-06-19 黑龙江科技学院 Power measuring device

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US6185508B1 (en) * 1994-12-30 2001-02-06 Power Measurement, Ltd. Power meter for determining parameters of multi-phase power lines
CN101487859A (en) * 2008-01-15 2009-07-22 湖北盛佳电器设备有限公司 High-voltage direct measurement apparatus
TW201241445A (en) * 2011-04-08 2012-10-16 Acbel Polytech Inc Power detection method for primary-side circuit of power supply and the power detection circuit
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106324319A (en) * 2016-08-02 2017-01-11 许继集团有限公司 Direct current voltage and direct current signal sampling circuit
CN108717140A (en) * 2018-08-29 2018-10-30 重庆金山科技(集团)有限公司 High frequency electric source equipment output power test device and test method

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