CN108333408A - A kind of electric automobile power battery group series connection total voltage Acquisition Circuit - Google Patents
A kind of electric automobile power battery group series connection total voltage Acquisition Circuit Download PDFInfo
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- CN108333408A CN108333408A CN201711287234.9A CN201711287234A CN108333408A CN 108333408 A CN108333408 A CN 108333408A CN 201711287234 A CN201711287234 A CN 201711287234A CN 108333408 A CN108333408 A CN 108333408A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Abstract
The present invention relates to a kind of electric automobile power battery group series connection total voltage Acquisition Circuits, including main control unit, first power-switching circuit, linear optical coupling and difference scaling circuit, isolated power supply conversion circuit, bleeder circuit and multichannel high pressure sampling control circuit, the output end of first power-switching circuit and linear optical coupling and difference scaling circuit is connect with the input terminal of main control unit, the output end of the input terminal and main control unit of bleeder circuit and multichannel high pressure sampling control circuit connects, the output end of first power-switching circuit respectively be isolated, the input terminal of linear optical coupling and difference scaling circuit connects, isolated power supply conversion circuit, the output end of bleeder circuit and multichannel high pressure sampling control circuit is connect with the input terminal of linear optical coupling and difference scaling circuit.The present invention has higher acquisition precision and signal-to-noise ratio and higher stability, and high voltage acquisition that is accurate, stablizing can be realized to battery management system estimation and power battery safety management.
Description
Technical field
The present invention relates to electric automobile power battery voltages to participate in technical field, and in particular to a kind of electric powered motor electricity
Pond group series connection total voltage Acquisition Circuit.
Background technology
With the increasingly exacerbation of energy crisis and environmental pollution, new-energy automobile is increasingly taken seriously, wherein mixing is dynamic
Power automobile, fuel cell car and pure electric automobile have ripe product and emerge, and pure electric automobile is even more because of its power
Property strong, good economy performance, zero-emission the advantages that and generally received by market.Power battery management system (battery
Management system, BMS) it is one of three big key technology of electric vehicle, the total voltage wherein acquisition power battery pack is connected
It is the main task of BMS.The acquisition precision of total voltage directly affect BMS to battery pack state-of-charge (state of charge,
SOC) and the calculating of the estimation of health status (state of health, SOH), cell stack power output and insulating resistance value with
And balance policy, and then influence electric automobile whole performance and safety.
Invention content
The purpose of the present invention is to provide a kind of electric automobile power battery group series connection total voltage Acquisition Circuits, realize power
The isolation measurement of battery pack series connection total voltage and digital-to-analogue conversion, can improve electric automobile whole performance and safety.
To achieve the above object, present invention employs following technical schemes：
A kind of electric automobile power battery group series connection total voltage Acquisition Circuit, including main control unit, the first power-switching circuit, line
Property optocoupler and difference scaling circuit, isolated power supply conversion circuit, bleeder circuit and multichannel high pressure sampling control circuit, multichannel
The input terminal of high input voltage interface, power input interface, the bleeder circuit and multichannel high pressure sampling control circuit is connected with more
The input terminal of road high input voltage interface, first power-switching circuit is connected with power input interface, and first power supply turns
The output end for changing circuit, linear optical coupling and difference scaling circuit is connect with the input terminal of main control unit, the partial pressure electricity
The output end of the input terminal and main control unit of road and multichannel high pressure sampling control circuit connects, first power-switching circuit
Output end is connect with the input terminal of isolated power supply conversion circuit, linear optical coupling and difference scaling circuit respectively, the isolation
The output end of power-switching circuit, bleeder circuit and multichannel high pressure sampling control circuit with linear optical coupling and difference scale operation
The input terminal of circuit connects.
As a further improvement of the above technical scheme：
The bleeder circuit and multichannel high pressure sampling control circuit include light coupling relay U1, triode Q1 and triode Q2；
The light coupling relay U1 includes pin 1, pin 2, pin 3, pin 4, pin 5, pin 6, pin 7 and pin 8, described
Pin 8 passes sequentially through resistance R2, resistance R1 and is connect with the first output end of multichannel high input voltage interface, and the pin 6 leads to successively
It crosses resistance R6, resistance R5 to connect with the second output terminal of multichannel high input voltage interface, the pin 1, pin 3 pass through resistance respectively
R3, resistance R4 are connect with power supply, and the pin 5 and pin 7 pass sequentially through resistance R9, R12 ground connection, the pin 4 and triode
The drain electrode of Q1 connects, and the emitter ground connection of the triode Q1, the pin 2 is connect with the collector of triode Q2, and described three
The emitter of pole pipe Q2 is grounded, and the base stage of triode Q1 and triode Q2 are respectively used to the output end of connection governor circuit, described
Node between resistance R9 and resistance R12 is used to connect the input terminal of linear optical coupling and difference scaling circuit.
The photoelectrical coupler U1 uses the chip of model AQW216.
The linear optical coupling and difference scaling circuit include linear optical coupling U2, operational amplifier U3A and operation amplifier
Two output ends of device U3B, the linear optical coupling U2 are connect with two input terminals of operational amplifier U3B respectively, the operation amplifier
The output end of device U3B is connect through resistance R17 with the in-phase input end of operational amplifier U3A, the reverse phase of the operational amplifier U3B
Input terminal is connect through the first filter circuit with its output end；The inverting input of the operational amplifier U3A is through the second filtered electrical
The connection of Lu Yuqi output ends and the inverting input are simultaneously connect through resistance R15 with the inverting input of operational amplifier U3B, institute
The output end for stating operational amplifier U3A is connect with main control unit.
The first filtered electrical routing resistance R14 is in parallel with capacitance C2 to be constituted, one end of the resistance R14 and operation amplifier
The inverting input of device U3B connects, and the other end of resistance R14 is connect with the output end of operational amplifier U3B；Second filtering
Electric routing resistance R13 is in parallel with capacitance C1 to be constituted, and one end of the resistance R13 connects with the inverting input of operational amplifier U3A
It connects, the other end of resistance R13 is connect with the output end of operational amplifier U3A.
The linear optical coupling U2 uses the chip of model ACPL-C87BT, the operational amplifier U3A and operation amplifier
Device U3B is all made of the chip of model OPA2314.
As shown from the above technical solution, electric automobile power battery group series connection total voltage Acquisition Circuit of the present invention,
High-voltage acquisition is carried out using partial pressure method and difference scaling circuit method, is contracted to total voltage in the way of electric resistance partial pressure
It puts, to adapt to the input range of linear optical coupling, the other end output difference signal of linear optical coupling passes through difference scaling circuit
Linear Amplifer is carried out to total voltage and is sampled.The circuit has higher acquisition precision and signal-to-noise ratio and higher stability,
High voltage acquisition is one of main task of cell management system of electric automobile.The height that the present invention can realize is accurate, stablize
Voltage acquisition estimates SOC and SOH and power battery safety management, promotion electric vehicle BMS performances etc. all to battery management system
Important in inhibiting.
Description of the drawings
Fig. 1 is the circuit block diagram of the present invention；
Fig. 2 is the bleeder circuit of the present invention and the circuit diagram of multichannel high pressure sampling control circuit；
Fig. 3 is the linear optical coupling of the present invention and the circuit diagram of difference scaling circuit.
Specific implementation mode
The present invention will be further described below in conjunction with the accompanying drawings：
The total voltage Acquisition Circuit as shown in Figure 1, the electric automobile power battery group of the present embodiment is connected, including main control unit 1, the
One power-switching circuit 2, linear optical coupling and difference scaling circuit 4, isolated power supply conversion circuit 3, bleeder circuit and multichannel
High pressure sampling control circuit 5；The input terminal of bleeder circuit and multichannel high pressure sampling control circuit 5 is connected with multichannel high input voltage and connects
Mouthfuls 6, the input terminal of the first power-switching circuit 2 is connected with power input interface 7, the first power-switching circuit 2, linear optical coupling and
The output end of difference scaling circuit 4 is connect with the input terminal of main control unit 1, bleeder circuit and multichannel high pressure controlling of sampling
The input terminal of circuit 5 is connect with the output end of main control unit 1, the output end of the first power-switching circuit 2 respectively with isolated power supply
The input terminal of conversion circuit 3, linear optical coupling and difference scaling circuit 4 connects, isolated power supply conversion circuit 3 and bleeder circuit
And the output end of multichannel high pressure sampling control circuit 5 is connect with the input terminal of linear optical coupling and difference scaling circuit 4.
The main control unit 1 of the present embodiment uses microcontroller, and the microcontroller 1 is using the XEP100 conducts of Freescale companies
There is the control function to external circuit, data analysis, processing, store function, communication function to have 12 ADC, meet by MCU
Operation, acquisition demand.Main control unit 1 enables bleeder circuit by pin and multichannel high pressure sampling control circuit 5 works, and passes through IO
The conduction and cut-off in optical relay channel is controlled, the input signal of multichannel high pressure is switched.And receive linear optical coupling and difference ratio fortune
The low-voltage analog signal of the conversion of circuit 4 is calculated to AD conversion interface, which is switched into digital signal, by interior
Portion's operational formula, calculates high-voltage value.
As shown in Fig. 2, the bleeder circuit and multichannel high pressure sampling control circuit 5 include light coupling relay U1, triode Q1
And triode Q2, wafer resistance R1, R2, R5, R6, R9, R12, patch film resistor R3, R4, R7, R8, R10, R11；Optocoupler after
Electric appliance U1 use model AQW216 chip, including pin 1, pin 2, pin 3, pin 4, pin 5, pin 6, pin 7 and
Pin 8, pin 8 pass sequentially through resistance R2, resistance R1 and are connect with the first output end of multichannel high input voltage interface, and pin 6 is successively
It is connect with the second output terminal of multichannel high input voltage interface by resistance R6, resistance R5, pin 1, pin 3 pass through resistance respectively
R3, resistance R4 are connect with power supply, and pin 5 and pin 7 pass sequentially through resistance R9, R12 ground connection, the current collection of pin 4 and triode Q1
Pole connects, and the emitter ground connection of triode Q1, pin 2 is connect with the collector of triode Q2, the emitter ground connection of triode Q2,
The base stage of triode Q1 and triode Q2 connect the output end of main control unit by resistance R7, R8 respectively, the transmitting of triode Q2
Pole is grounded, and the base stage of triode Q1 and triode Q2 connect the output end of main control unit, triode Q1 by resistance R7, R8 respectively
And the base stage of triode Q2 is connected to ground by R10, R11 respectively, the node between resistance R9 and resistance R12 is linear for connecting
The input terminal of optocoupler and difference scaling circuit.
In bleeder circuit and multichannel high pressure sampling control circuit 5, resistance R1, R2, R5, R6, R9, R12 are using wafer electricity
Resistance, zooms in and out total voltage, to adapt to the input range of linear optical coupling.The bleeder circuit and multichannel high pressure sampling control circuit
5 control the switch of light coupling relay on or off by single-chip microcomputer signal, so as to select the break-make in circuit to realize multichannel
High pressure samples.Using multichannel high_voltage isolation light coupling relay U1, light coupling relay U1 with no mechanical contact in the circuit,
Therefore the not abrasion of contact, service life is unlimited；Shockproof and spring；Shockproof, drop resistant performance is good；Small size, Gao Xin
Lai Xing；Low action current, high-isolating, input are completely insulated with outlet chamber；It switches at high speed, low current leakage, alternating current-direct current is simultaneous
The features such as using.
As shown in figure 3, linear optical coupling and difference scaling circuit 4 include linear optical coupling U2, operational amplifier U3A and fortune
Calculate amplifier U3B, chip ceramic capacitor C1-C9, patch film resistor R13-R20.Linear optical coupling U2 uses model ACPL-
Two output ends of the chip of C87BT, linear optical coupling U2 are connect with two input terminals of operational amplifier U3B respectively, operational amplifier
The output end of U3B is connect through resistance R17 with the in-phase input end of operational amplifier U3A, the inverting input of operational amplifier U3B
It is connect with its output end through the first filter circuit；The inverting input of operational amplifier U3A is exported through the second filter circuit with it
End connection and the inverting input are simultaneously connect through resistance R15 with the inverting input of operational amplifier U3B, operational amplifier U3A
Output end connect with main control unit.The 1st pin of linear optical coupling U2 is connected with capacitance C3, isolated power supply ISO_VCC, capacitance C3
Another pin with connecing isolated power supply, the 3rd pin of linear optical coupling U2 with connecing isolated power supply, the 4th pin of linear optical coupling U2 connect every
From power ground, the 5th pin of linear optical coupling U2 is grounded, and the 8th pin of linear optical coupling U2 is connected with capacitance C4, power supply VCC, capacitance
Another pin ground connection of C4.
First filtered electrical routing resistance R14 is in parallel with capacitance C2 to be constituted, and one end of resistance R14 is with operational amplifier U3B's
Inverting input connects, and the other end of resistance R14 is connect with the output end of operational amplifier U3B；Second filtered electrical routing resistance
R13 is in parallel with capacitance C1 to be constituted, and one end of resistance R13 is connect with the inverting input of operational amplifier U3A, and resistance R13's is another
One end is connect with the output end of operational amplifier U3A, and one end and operational amplifier U3B be just after capacitance C9 is in parallel with resistance R20
Phase input terminal connects, other end ground connection, the normal phase input end of one end and operational amplifier U3A after capacitance C8 is in parallel with resistance R19
Connection, other end ground connection, capacitance C6 connect connection with the input pin of one end and linear optical coupling after capacitance C7 parallel connections, it is another terminate every
Liftoff ISO_GND.The present embodiment, operational amplifier U3A and operational amplifier U3B use the chip of model OPA2314.
Linear optical coupling and difference scaling circuit 4 are using the low imbalance of Primary Component, high-gain, high-precision and stability
Linear optical coupling ACPL-C87BT and low-power consumption, rail-to-rail to output and input operational amplifier OPA2314, linear optical coupling U2 outputs are just
Than in the differential signal of input voltage, output signal and input signal are linear, and signal anti-interference ability greatly improves, fit
In environment for monitoring DC bus-bar voltage strong noise, sample circuit and high-tension circuit are subjected to electrical isolation, realized
The trouble free service of control circuit.Linear optical coupling U2 is by the differential signal of output by the difference of operational amplifier U3A and U3B composition
Output calculates high-voltage value to the AD mouths of microcontroller by microcontroller after scaling circuit amplifies signal proportion.Operation amplifier
Device U3A, U3B, which are binary channels operational amplifier, realizes the perfect adaptation of power consumption and performance, per channel down to 190uA under 1 kHz
Maximum static current and 14 nV/rtHz low noise, can keep high s/n ratio, reduce system power dissipation while, support
Low-level signal amplifies；The operating voltage of 1.8V to 5.5 V adds the rail-to-rail input and output amplitude of oscillation, the expansible amplifier
Dynamic input/output bound keeps or improves signal chains signal-to-noise ratio；3MHz gain bandwidths support high sensitivity, can be in wide in range frequency
High resolution system is realized under rate;Low input biasing:0.2pA input bias currents support the anti-application of high source resistance.
The present embodiment, power input interface 7, the connector used has foolproof function for plugs and sockets connection type,
It prevents from mispluging and leads to equipment damage.Plug is horizontally mounted mode, and the bottom of plug casing can resist installation equipped with fixed feet is reinforced
It is swung caused by cable afterwards, terminals minor connector can also be used.
First power-switching circuit 2, being will be defeated by the linear voltage regulator of wide range input voltage, fixed output voltage values
Enter the operating voltage that power supply is converted into main control unit 1, isolated power supply conversion circuit 3, linear optical coupling and difference scaling circuit 4
VCC. switching type power supply module can also be used in this linear voltage regulator.
Isolated power supply conversion circuit 3 is inputted using the constant voltage of integrated form, and the DC/DC power modules of output are isolated, and is line
Property optocoupler and difference scaling circuit 5 isolated power supply all the way is provided.The DC/DC power modules are super to have output short circuit protection
（Self- recoverage）Function, peripheral circuit are simple.Meet electric vehicle use environment.
Multichannel high input voltage interface 6 ensure that the secured electrical gap of high pressure using the connector of big spacing high voltage value
And safety creepage distance.
The high voltage acquisition of the present invention is one of main task of cell management system of electric automobile.It can be accurate, steady
Fixed is acquired high voltage, is suffered to battery management system estimation SOC and SOH and power battery safety management etc. important
Meaning.
Operation principle：Externally fed equipment provides entire circuit work required total voltage by power input interface 7,
The total voltage is converted into main control unit 1, linear optical coupling and difference scaling circuit 4 and isolation by the first power-switching circuit 2
Power-switching circuit 3 works the operating voltage (VCC GND) of required stabilization.Isolated power supply conversion circuit 3 is by operating voltage
(VCC GND) is converted into the another way isolated working voltage (ISO_ that linear optical coupling and difference scaling circuit 4 work required
VCC ISO_GND)。
External multichannel power battery pack series connection total voltage accesses bleeder circuit by multichannel high input voltage interface 6 and multichannel is high
Sampling control circuit 5 is pressed, total voltage is divided by multiple wafer resistance in bleeder circuit, is by 0-500V high voltages partial pressure
The low voltage signal of 0V-2V is to adapt to the input range of linear optical coupling.The low voltage signal is automatically converted into difference by linear optical coupling
Sub-signal, differential signal are amplified to the voltage signal of 0V-5V using difference scaling circuit to adapt to main control unit
In microcontroller sample range, the microcontroller in main control unit passes through I/O port and controls bleeder circuit and multichannel high pressure controlling of sampling
Light coupling relay on or off in circuit 5, selection wherein all the way high pressure sampling main control units in microcontroller AD input
Mouth samples voltage signal, by SCM program operation, calculates external impetus battery pack series connection total voltage.It is more to realize
Road power battery pack series connection total voltage acquisition.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
It encloses and is defined, under the premise of not departing from design spirit of the present invention, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made should all be fallen into the protection domain of claims of the present invention determination.
Claims (6)
- The total voltage Acquisition Circuit 1. a kind of electric automobile power battery group is connected, it is characterised in that：Including main control unit, the first electricity Power-switching circuit, linear optical coupling and difference scaling circuit, isolated power supply conversion circuit, bleeder circuit and the sampling of multichannel high pressure Control circuit, multichannel high input voltage interface, power input interface, the bleeder circuit and multichannel high pressure sampling control circuit it is defeated Enter end and be connected with multichannel high input voltage interface, the input terminal of first power-switching circuit is connected with power input interface, institute The output end for stating the first power-switching circuit, linear optical coupling and difference scaling circuit connects with the input terminal of main control unit It connects, the output end connection of the input terminal and main control unit of the bleeder circuit and multichannel high pressure sampling control circuit, described first The output end of power-switching circuit respectively with isolated power supply conversion circuit, the input terminal of linear optical coupling and difference scaling circuit Connection, the output end of the isolated power supply conversion circuit, bleeder circuit and multichannel high pressure sampling control circuit is and linear optical coupling And the input terminal connection of difference scaling circuit.
- The total voltage Acquisition Circuit 2. electric automobile power battery group according to claim 1 is connected, it is characterised in that：It is described Bleeder circuit and multichannel high pressure sampling control circuit include light coupling relay U1, triode Q1 and triode Q2；The light coupling relay U1 includes pin 1, pin 2, pin 3, pin 4, pin 5, pin 6, pin 7 and pin 8, described Pin 8 passes sequentially through resistance R2, resistance R1 and is connect with the first output end of multichannel high input voltage interface, and the pin 6 leads to successively It crosses resistance R6, resistance R5 to connect with the second output terminal of multichannel high input voltage interface, the pin 1, pin 3 pass through resistance respectively R3, resistance R4 are connect with power supply, and the pin 5 and pin 7 pass sequentially through resistance R9, R12 ground connection, the pin 4 and triode The drain electrode of Q1 connects, and the emitter ground connection of the triode Q1, the pin 2 is connect with the collector of triode Q2, and described three The emitter of pole pipe Q2 is grounded, and the base stage of triode Q1 and triode Q2 are respectively used to the output end of connection governor circuit, described Node between resistance R9 and resistance R12 is used to connect the input terminal of linear optical coupling and difference scaling circuit.
- The total voltage Acquisition Circuit 3. electric automobile power battery group according to claim 2 is connected, it is characterised in that：It is described Photoelectrical coupler U1 uses the chip of model AQW216.
- The total voltage Acquisition Circuit 4. electric automobile power battery group according to claim 1 is connected, it is characterised in that：It is described Linear optical coupling and difference scaling circuit include linear optical coupling U2, operational amplifier U3A and operational amplifier U3B, the line Two output ends of property optocoupler U2 are connect with two input terminals of operational amplifier U3B respectively, the output end of the operational amplifier U3B It is connect with the in-phase input end of operational amplifier U3A through resistance R17, the inverting input of the operational amplifier U3B is through first Filter circuit is connect with its output end；The inverting input of the operational amplifier U3A is through the second filter circuit and its output end Connection and the inverting input are simultaneously connect through resistance R15 with the inverting input of operational amplifier U3B, the operational amplifier The output end of U3A is connect with main control unit.
- The total voltage Acquisition Circuit 5. electric automobile power battery group according to claim 4 is connected, it is characterised in that：It is described First filtered electrical routing resistance R14 is in parallel with capacitance C2 to be constituted, the reverse phase of one end and operational amplifier U3B of the resistance R14 Input terminal connects, and the other end of resistance R14 is connect with the output end of operational amplifier U3B；The second filtered electrical routing resistance R13 is in parallel with capacitance C1 to be constituted, and one end of the resistance R13 is connect with the inverting input of operational amplifier U3A, resistance R13 The other end connect with the output end of operational amplifier U3A.
- The total voltage Acquisition Circuit 6. electric automobile power battery group according to claim 4 is connected, it is characterised in that：It is described Linear optical coupling U2 uses the chip of model ACPL-C87BT, and the operational amplifier U3A and operational amplifier U3B are all made of type Number be OPA2314 chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711287234.9A CN108333408A (en) | 2017-12-07 | 2017-12-07 | A kind of electric automobile power battery group series connection total voltage Acquisition Circuit |
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| CN201711287234.9A CN108333408A (en) | 2017-12-07 | 2017-12-07 | A kind of electric automobile power battery group series connection total voltage Acquisition Circuit |
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| CN111830423A (en) * | 2020-06-24 | 2020-10-27 | 东风电驱动系统有限公司 | Isolated high-voltage sampling circuit |
| CN112505514A (en) * | 2020-12-18 | 2021-03-16 | 中山市优胜电子科技有限公司 | Withstand voltage test leakage current acquisition circuit |
| CN112711207A (en) * | 2020-12-21 | 2021-04-27 | 国网北京市电力公司 | High-voltage direct current signal acquisition module and electronic device |
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| CN111830423A (en) * | 2020-06-24 | 2020-10-27 | 东风电驱动系统有限公司 | Isolated high-voltage sampling circuit |
| CN112505514A (en) * | 2020-12-18 | 2021-03-16 | 中山市优胜电子科技有限公司 | Withstand voltage test leakage current acquisition circuit |
| CN112711207A (en) * | 2020-12-21 | 2021-04-27 | 国网北京市电力公司 | High-voltage direct current signal acquisition module and electronic device |
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Application publication date: 20180727 |