CN106645905A - Output voltage isolation sampling circuit of high-voltage inverter - Google Patents
Output voltage isolation sampling circuit of high-voltage inverter Download PDFInfo
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- CN106645905A CN106645905A CN201611040502.2A CN201611040502A CN106645905A CN 106645905 A CN106645905 A CN 106645905A CN 201611040502 A CN201611040502 A CN 201611040502A CN 106645905 A CN106645905 A CN 106645905A
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses an output voltage isolation sampling circuit of a high-voltage inverter. The isolation sampling circuit is composed of a resistor and divider sampling circuit, a differential amplifier conditioning circuit, an optocoupler isolation sampling circuit, and an operational amplifier conditioning circuit. The input terminal of the resistor and divider sampling circuit is connected with a voltage output terminal of a high-voltage inverter; the differential amplifier conditioning circuit is connected with the resistor and divider sampling circuit electrically; and the operational amplifier conditioning circuit is connected with the optocoupler isolation sampling circuit electrically. The voltage after processing is a voltage meeting a digital-analog signal converter sampling pin of a digital signal processing chip and is sent into a digital-analog signal converter sampling pin of a digital signal processing chip; and the digital signal processing chip carries out sampling and computing processing, so that the system is controlled to monitor the output voltage of the high-voltage inverter in real time and overvoltage protection, undervoltage protection, phase-locked bypass and other functions can be realized.
Description
Technical field
The present invention relates to the output voltage control technical field of high frequency transformer, and in particular to a kind of high voltage converter output
Voltage isolates sample circuit.
Background technology
High voltage converter is the electricity that power-frequency voltage is transformed into another frequency using the on-off action of power semiconductor device
Can control device.High voltage converter as electric drive system nucleus equipment, its reliability and stable requirement it is higher, to height
The control algolithm of voltage frequency changer, detection and the protection of each input and output amount requirement it is also higher, wherein, the output of high voltage converter
, due to being related to 10KV high pressure, its detection method is in addition to it will ensure accuracy, it is also noted that hi-lo circuit for voltage detecting
Isolation, to protect rear class equipment and personal safety.
The mode that the output voltage method of sampling of high voltage converter is most conventional is measured using voltage transformer, but should
Method is suffered from the drawback that：1st, accuracy of detection is low, due to the output voltage frequency of high voltage converter be in the range of 0 to 50Hz can
Adjust, this can cause the certainty of measurement of voltage transformer to be deteriorated, affect the computing and control of main control unit；2nd, for high-tension measurement
The general volume of voltage transformer, weight are all larger, and for volume itself is for very big high voltage converter, this also can accordingly increase
The size of big frequency converter, is also not easy to install；3rd, three-phase output is required for voltage transformer to detect, cost is of a relatively high.
The content of the invention
For defect present in prior art, it is an object of the invention to provide a kind of high voltage converter output voltage every
From sample circuit, have the advantages that accuracy of detection is high, circuit structure is succinct, convenient installation and device cost are low.
To reach object above, the present invention is adopted the technical scheme that：
A kind of high voltage converter output voltage isolates sample circuit, including：
Electric resistance partial pressure sample circuit, the input of the electric resistance partial pressure sample circuit connects the voltage output of high voltage converter
End, the electric resistance partial pressure sample circuit receives the output voltage of high voltage converter, and to the output voltage step-down process is carried out；
Differential amplification modulate circuit, the differential amplification modulate circuit is electrically connected with the electric resistance partial pressure sample circuit, institute
State differential amplification modulate circuit and receive the output voltage after step-down is processed, and output voltage is amplified and bias treatment；
Light-coupled isolation sample circuit, the light-coupled isolation sample circuit is electrically connected with the differential amplification modulate circuit, institute
State light-coupled isolation sample circuit and receive the differential amplification modulate circuit amplification and the output voltage after bias treatment, and to described
Output voltage carries out insulation blocking transmission；
Amplifier modulate circuit, the amplifier modulate circuit is electrically connected with the light-coupled isolation sample circuit, and the amplifier is adjusted
Reason circuit receives the output voltage after light-coupled isolation sample circuit insulation blocking transmission, and carries out amplifier process to output voltage,
It is met the voltage of the digital-to-analog signal converter sampling pin of digital signal processing chip.
On the basis of above-mentioned technical proposal, the electric resistance partial pressure sample circuit includes three electric resistance partial pressures sampling branch roads,
Three every electric resistance partial pressure sampling branch roads include multiple divider resistances being in series, the input of every electric resistance partial pressure sampling branch road
One phase power output end of correspondence connection three-phase electricity, the output end of every electric resistance partial pressure sampling branch road is by metal oxide film electricity
Resistance ground connection, the output end of three electric resistance partial pressure sampling branch roads is also connected with the input of the differential amplification modulate circuit.
On the basis of above-mentioned technical proposal, the differential amplification modulate circuit includes amplifying circuit and homophase add operation
Circuit, the input of the amplifying circuit connects the output end of the electric resistance partial pressure sample circuit, the output of the amplifying circuit
The input of the end connection homophase adder operation circuit, the output end of the homophase adder operation circuit connect the optocoupler every
From the input of sample circuit.
On the basis of above-mentioned technical proposal, in the amplifying circuit, one end of a resistance R1 connects the resistance point
Pressure sample circuit, the resistance R1 other ends connect respectively the positive input terminal of resistance R2 and operational amplifier U1, and the one of resistance R3
The end connection electric resistance partial pressure sample circuit, the resistance R3 other ends connection connects respectively resistance R4, electric capacity C1 and computing and puts
The negative input end of big device U1, the output end of operational amplifier U1 connects the other end of the electric capacity C1 and one end of resistance R5, institute
The other end for stating resistance R5 connects respectively the other end of the resistance R4 and the input of the homophase adder operation circuit.
On the basis of above-mentioned technical proposal, in the homophase adder operation circuit, put described in one end connection of resistance R7
The output end of big circuit, the positive input terminal of the other end concatenation operation amplifier U2 of the resistance R7, one end of resistance R6 accesses+
5V bias voltages, the positive input terminal of the other end concatenation operation amplifier U2 of the resistance R6, one end ground connection of resistance R8 is described
The other end of resistance R8 connects respectively the negative input end of one end of resistance R9, one end of electric capacity C2 and operational amplifier U2, described
The output end of operational amplifier U2 connects respectively the other end of the electric capacity C2 and one end of resistance R10, and the resistance R10's is another
One end connects respectively the input of the other end of the R9 and the light-coupled isolation sample circuit.
On the basis of above-mentioned technical proposal, in the light-coupled isolation sample circuit, one end connection of linear optical coupling is described
The output end of differential amplification modulate circuit, the positive input terminal of the other end concatenation operation amplifier U3 of the linear optical coupling is described
The negative input end of operational amplifier U3 and the output end connection resistance R11 of operational amplifier U3, the operational amplifier U3's is defeated
Go out the input of the end connection amplifier modulate circuit.
On the basis of above-mentioned technical proposal, in the amplifier modulate circuit, the output of the light-coupled isolation sample circuit
The positive input terminal of end concatenation operation amplifier U4, the negative input end and output end of the operational amplifier U4 are connected with resistance R12,
The output end of the operational amplifier U4 connects one end of resistance R14, the other end concatenation operation amplifier U5 of the resistance R14
Positive input terminal, the positive input terminal of the operational amplifier U5 connects one end of resistance R13 simultaneously, and the resistance R13's is another
Terminate into+3.3V bias voltages, the negative input end of the operational amplifier U5 connects respectively one end of resistance R15, electric capacity C3
One end and one end of resistance R16, the other end ground connection of the resistance R15, the other end of the electric capacity C3 connects the computing and puts
The output end of big device U5, the output end of the operational amplifier U5 connects one end of resistance R17 simultaneously, and the resistance R16's is another
One end connects the other end of the resistance R17.
On the basis of above-mentioned technical proposal, the output voltage after the electric resistance partial pressure sample circuit voltage division processing
Scope is -10～+10V；The differential amplification modulate circuit is amplified and biases to the output voltage after step-down process
The scope of the output voltage after process is 0～5V.
Compared with prior art, it is an advantage of the current invention that：
1) a kind of high voltage converter output voltage of the invention isolation sample circuit, by electric resistance partial pressure sample circuit by height
The high voltage of voltage frequency changer output carries out partial pressure decay, and differential amplification modulate circuit is further carried out to the voltage after partial pressure decay
The voltage that decay and bias treatment are obtained, the light-coupled isolation sample circuit for being easy to rear class works, and light-coupled isolation sample circuit is adopted
Be that high-linearity analogy optocoupler carries out voltage transmission, 1:1 transfer ratio ensure that the voltage before and after isolation is basically identical, distortion
Degree is low, while and realize the security isolation of height laminate section, protection late-class circuit and main control chip, it is to avoid burn out main control chip and
The situation for causing whole control failure occurs.
2) in a kind of high voltage converter output voltage of the invention isolation sample circuit, after light-coupled isolation sample circuit
Voltage after the following of amplifier modulate circuit, 3.3V bias treatments, is converted to the numeral for meeting digital signal processing chip again
Analog signal converter sampling pin voltage, sends into the digital-to-analog signal converter sampling pin of digital signal processing chip,
Sampled by digital signal processing chip and calculation process, so that control system monitors in real time the output electricity of high voltage converter
Press and realize overvoltage protection, under-voltage protection, the lock mutually function such as bypass.
Description of the drawings
Fig. 1 is the structured flowchart that output voltage isolates sample circuit in the embodiment of the present invention；
Fig. 2 is the circuit diagram of electric resistance partial pressure sample circuit in the embodiment of the present invention；
Fig. 3 is the circuit diagram of differential amplification modulate circuit in the embodiment of the present invention；
Fig. 4 is the circuit diagram of light-coupled isolation sample circuit in the embodiment of the present invention；
Fig. 5 is the circuit diagram of amplifier modulate circuit in the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Shown in Figure 1, the embodiment of the present invention provides a kind of high voltage converter output voltage and isolates sample circuit, including：
Electric resistance partial pressure sample circuit, the input of electric resistance partial pressure sample circuit connects the voltage output end of high voltage converter,
Electric resistance partial pressure sample circuit receives the output voltage of high voltage converter, and to output voltage step-down process is carried out；
Differential amplification modulate circuit, differential amplification modulate circuit is electrically connected with electric resistance partial pressure sample circuit, and differential amplification is adjusted
Reason circuit receives the output voltage after step-down is processed, and output voltage is amplified and bias treatment；
Light-coupled isolation sample circuit, light-coupled isolation sample circuit is electrically connected with differential amplification modulate circuit, and light-coupled isolation is adopted
Sample circuit receives differential amplification modulate circuit and amplifies and the output voltage after bias treatment, and carries out insulation blocking to output voltage
Transmission；
Amplifier modulate circuit, amplifier modulate circuit is electrically connected with light-coupled isolation sample circuit, amplifier modulate circuit receiving light
Output voltage after coupling isolation sample circuit insulation blocking transmission, and amplifier process is carried out to output voltage, it is met numeral
The pin voltage of the digital-to-analog signal converter sampling of signal processing chip.
Shown in Figure 2, electric resistance partial pressure sample circuit includes three electric resistance partial pressures sampling branch roads, every electric resistance partial pressure sampling
Branch road includes multiple resistant series divider resistances, a phase of the input correspondence connection three-phase electricity of every electric resistance partial pressure sampling branch road
Power output end, the output end of every electric resistance partial pressure sampling branch road is connect by the metal-oxide film resistor that a precision is 0.1%
Ground, the output end of every electric resistance partial pressure sampling branch road is also connected with the input of differential amplification modulate circuit.Wherein one string resistance
The input of partial pressure sampling branch road connects the power input U of three-phase electricity, and output end connects U_Low ends and metal oxidation simultaneously
One end of film resistor, the other end ground connection of metal-oxide film resistor；The input connection of one electric resistance partial pressure sampling branch road
The power input V of three-phase electricity, output end connects one end of V_Low ends and a metal-oxide film resistor, metal oxidation simultaneously
The other end ground connection of film resistor；The input of one electric resistance partial pressure sampling branch road connects the power input W of three-phase electricity, output
End connects one end of W_Low ends and a metal-oxide film resistor, the other end ground connection of metal-oxide film resistor simultaneously.Using
Be that precision reaches millesimal high-precision power resistant series partial pressure, its partial pressure attenuation multiple is about 1821 times, sampling essence
Degree is less than 0.1%, and the scope of the output voltage after electric resistance partial pressure sample circuit voltage division processing is -10～+10V.
Differential amplification modulate circuit includes amplifying circuit and homophase adder operation circuit, the input connection electricity of amplifying circuit
The output end of resistance pressure sampling circuit, the output end of amplifying circuit connects the input of homophase adder operation circuit, same to additive process
The output end of computing circuit connects the input of light-coupled isolation sample circuit.
Shown in Figure 3, in amplifying circuit, one end of a resistance R1 connects the U_Low ends of electric resistance partial pressure sample circuit,
The resistance R1 other ends connect respectively the positive input terminal of resistance R2 and operational amplifier U1, and one end connection electric resistance partial pressure of resistance R3 is adopted
The U_Low ends of sample circuit, resistance R3 other ends connection connects respectively resistance R4, the negative input of electric capacity C1 and operational amplifier U1
End, the other end of the output end connection electric capacity C1 of operational amplifier U1 and one end of resistance R5, the other end of resistance R5 connects respectively
The other end of connecting resistance R4 and the input of homophase adder operation circuit.Differential amplification modulate circuit is to the output after step-down process
It is 0～5V that voltage is amplified with the scope of the output voltage after bias treatment.
In homophase adder operation circuit, one end of resistance R7 connects the output end of amplifying circuit, and the other end of resistance R7 connects
The positive input terminal of operational amplifier U2 is connect ,+5V bias voltages are accessed in one end of resistance R6, and the other end concatenation operation of resistance R6 is put
The positive input terminal of big device U2, one end ground connection of resistance R8, the other end of resistance R8 connects respectively one end of resistance R9, electric capacity C2
One end and the negative input end of operational amplifier U2, the output end of operational amplifier U2 connects respectively the other end and resistance of electric capacity C2
One end of R10, the other end of resistance R10 connects respectively the other end and output end U_Sample of R9.By homophase add operation
Discharge circuit in circuit adds 5V bias voltages, and the voltage signal of 0 to 5V is obtained after add operation, is easy to rear class optocoupler
Sample circuit works.The pF level small capacitances for being wherein connected across amplifier output end and negative-feedback end play a part of phase compensation.
Shown in Figure 4, in light-coupled isolation sample circuit, one end of linear optical coupling connects the defeated of differential amplification modulate circuit
Go out and hold U_Sample, the positive input terminal of the other end concatenation operation amplifier U3 of linear optical coupling, the negative input of operational amplifier U3
The output end U1_Sample connection amplifier conditioning of the output end connection resistance R11 of end and operational amplifier U3, operational amplifier U3
The input of circuit.Voltage transmission is carried out using high-linearity analogy optocoupler in the present embodiment, 1:1 transfer ratio ensure that isolation
Voltage in front and back is basically identical, and the distortion factor is low, while and realize the security isolation of height laminate section, protect the amplifier conditioning of rear class
Circuit and digital signal processing chip, it is to avoid burn out digital signal processing chip and cause the situation of whole control failure to occur.
It is shown in Figure 5, in amplifier modulate circuit, the output end U1_Sample concatenation operation of light-coupled isolation sample circuit
The positive input terminal of amplifier U4, the negative input end and output end of operational amplifier U4 are connected with resistance R12, operational amplifier U4's
Output end connects one end of resistance R14, the positive input terminal of the other end concatenation operation amplifier U5 of resistance R14, operational amplifier
The positive input terminal of U5 connects one end of resistance R13 simultaneously, and the other end of resistance R13 accesses+3.3V bias voltages, operational amplifier
The negative input end of U5 connects respectively one end of one end of resistance R15, one end of electric capacity C3 and resistance R16, the other end of resistance R15
Ground connection, the output end of the other end concatenation operation amplifier U5 of electric capacity C3, the output end of operational amplifier U5 connects resistance simultaneously
One end of R17, the other end of resistance R17 connects the other end of resistance R16 and the digital simulation of digital signal processing chip simultaneously
The DSP_Sample ends of signal adapter.Again process is followed voltage after the isolation sampling of light-coupled isolation sample circuit, 3.3V is biased
After process, the voltage of the digital-to-analog signal converter sampling pin voltage scope for meeting digital signal processing chip is converted to,
Send into digital signal processing chip digital-to-analog signal converter sampling pin, by digital signal processing chip carry out sampling and
Calculation process, so as to control system monitor the output voltage of high voltage converter in real time and realize overvoltage protection, under-voltage protection,
Lock the mutually function such as bypass.
The present invention is not limited to above-mentioned embodiment, for those skilled in the art, without departing from
On the premise of the principle of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (8)
1. a kind of high voltage converter output voltage isolates sample circuit, it is characterised in that include：
Electric resistance partial pressure sample circuit, the input of the electric resistance partial pressure sample circuit connects the voltage output end of high voltage converter,
The electric resistance partial pressure sample circuit receives the output voltage of high voltage converter, and to the output voltage step-down process is carried out；
Differential amplification modulate circuit, the differential amplification modulate circuit is electrically connected with the electric resistance partial pressure sample circuit, the difference
Divide and amplify the output voltage after modulate circuit reception step-down is processed, and output voltage is amplified and bias treatment；
Light-coupled isolation sample circuit, the light-coupled isolation sample circuit is electrically connected with the differential amplification modulate circuit, the light
Coupling isolation sample circuit receives the differential amplification modulate circuit and amplifies and the output voltage after bias treatment, and to the output
Voltage carries out insulation blocking transmission；
Amplifier modulate circuit, the amplifier modulate circuit is electrically connected with the light-coupled isolation sample circuit, the amplifier conditioning electricity
Road receives the output voltage after light-coupled isolation sample circuit insulation blocking transmission, and carries out amplifier process to output voltage, obtains
Meet the voltage of the digital-to-analog signal converter sampling pin of digital signal processing chip.
2. a kind of high voltage converter output voltage as claimed in claim 1 isolates sample circuit, it is characterised in that：The resistance
Pressure sampling circuit includes that three electric resistance partial pressures are sampled branch roads, and three every electric resistance partial pressure sampling branch roads include multiple being in series
Divider resistance, a phase power output end of the input correspondence connection three-phase electricity of every electric resistance partial pressure sampling branch road, every resistance
The output end of partial pressure sampling branch road is grounded by a metal oxidation resistance, and the output end of three electric resistance partial pressure sampling branch roads also connects
Connect the input of the differential amplification modulate circuit.
3. a kind of high voltage converter output voltage as claimed in claim 1 isolates sample circuit, it is characterised in that：The difference
Amplifying modulate circuit includes amplifying circuit and homophase adder operation circuit, and the input of the amplifying circuit connects the resistance point
The output end of pressure sample circuit, the output end of the amplifying circuit connects the input of the homophase adder operation circuit, described
The output end of homophase adder operation circuit connects the input of the light-coupled isolation sample circuit.
4. a kind of high voltage converter output voltage as claimed in claim 3 isolates sample circuit, it is characterised in that：The amplification
In circuit, one end of a resistance R1 connects the electric resistance partial pressure sample circuit, and the resistance R1 other ends connect respectively resistance
The positive input terminal of R2 and operational amplifier U1, one end of resistance R3 connects the electric resistance partial pressure sample circuit, and the resistance R3 is another
One end connection connects respectively resistance R4, the negative input end of electric capacity C1 and operational amplifier U1, and the output end of operational amplifier U1 connects
The other end of the electric capacity C1 and one end of resistance R5 are connect, the other end of the resistance R5 connects respectively the another of the resistance R4
End and the input of the homophase adder operation circuit.
5. a kind of high voltage converter output voltage as claimed in claim 3 isolates sample circuit, it is characterised in that：The homophase
In adder operation circuit, one end of resistance R7 connects the output end of the amplifying circuit, the other end connection fortune of the resistance R7
The positive input terminal of amplifier U2 is calculated ,+5V bias voltages are accessed in one end of resistance R6, and the other end concatenation operation of the resistance R6 is put
The positive input terminal of big device U2, one end ground connection of resistance R8, the other end of the resistance R8 connects respectively one end of resistance R9, electric capacity
One end of C2 and the negative input end of operational amplifier U2, the output end of the operational amplifier U2 connects respectively the electric capacity C2's
One end of the other end and resistance R10, the other end of the resistance R10 connects respectively the other end of the R9 and the light-coupled isolation
The input of sample circuit.
6. a kind of high voltage converter output voltage as claimed in claim 1 isolates sample circuit, it is characterised in that：The optocoupler
In isolation sample circuit, one end of linear optical coupling connects the output end of the differential amplification modulate circuit, the linear optical coupling
The positive input terminal of other end concatenation operation amplifier U3, the negative input end of the operational amplifier U3 and operational amplifier U3's is defeated
Go out end connection resistance R11, the output end of the operational amplifier U3 connects the input of the amplifier modulate circuit.
7. a kind of high voltage converter output voltage as claimed in claim 1 isolates sample circuit, it is characterised in that：The amplifier
In modulate circuit, the positive input terminal of the output end concatenation operation amplifier U4 of the light-coupled isolation sample circuit, the computing is put
The negative input end and output end of big device U4 is connected with resistance R12, and the output end of the operational amplifier U4 connects the one of resistance R14
End, the positive input terminal of the other end concatenation operation amplifier U5 of the resistance R14, the positive input terminal of the operational amplifier U5 is same
When connect one end of resistance R13, the other end of the resistance R13 accesses+3.3V bias voltages, and the operational amplifier U5's is negative
Input connects respectively one end of one end of resistance R15, one end of electric capacity C3 and resistance R16, another termination of the resistance R15
Ground, the other end of the electric capacity C3 connects the output end of the operational amplifier U5, and the output end of the operational amplifier U5 is same
When connect one end of resistance R17, the other end of the resistance R16 connects the other end of the resistance R17.
8. a kind of high voltage converter output voltage as claimed in claim 1 isolates sample circuit, it is characterised in that：The resistance
The scope of the output voltage after pressure sampling circuit voltage division processing is -10～+10V；The differential amplification modulate circuit pair
It is 0～5V that the output voltage after step-down process is amplified with the scope of the output voltage after bias treatment.
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| CN201611040502.2A CN106645905B (en) | 2016-11-11 | 2016-11-11 | Output voltage isolation sampling circuit of high-voltage frequency converter |
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| CN201611040502.2A CN106645905B (en) | 2016-11-11 | 2016-11-11 | Output voltage isolation sampling circuit of high-voltage frequency converter |
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| CN107478885A (en) * | 2017-08-02 | 2017-12-15 | 国网陕西省电力公司电力科学研究院 | A kind of differential signal isolated variable device and method suitable for mesohigh signal |
| CN107478885B (en) * | 2017-08-02 | 2023-09-12 | 国网陕西省电力公司电力科学研究院 | Differential signal isolation conversion device and method suitable for medium-high voltage signals |
| CN110018340A (en) * | 2019-03-15 | 2019-07-16 | 广州小鹏汽车科技有限公司 | A kind of battery voltage sampling circuit, method and battery management system |
| CN111751605A (en) * | 2019-03-29 | 2020-10-09 | 全球能源互联网研究院有限公司 | High potential voltage measuring device and method |
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| CN110702974A (en) * | 2019-10-22 | 2020-01-17 | 湖南凯杰科技有限责任公司 | High-reliability current sampling circuit of alternating current servo motor |
| CN110702974B (en) * | 2019-10-22 | 2022-04-01 | 中电凯杰科技有限公司 | High-reliability current sampling circuit of alternating current servo motor |
| CN110850761B (en) * | 2019-10-25 | 2022-11-01 | 天津航空机电有限公司 | High-precision analog quantity acquisition circuit |
| CN110850761A (en) * | 2019-10-25 | 2020-02-28 | 天津航空机电有限公司 | High-precision analog quantity acquisition circuit |
| CN111413893B (en) * | 2020-03-02 | 2023-11-03 | 国网江苏省电力有限公司电力科学研究院 | Wireless current collection system for starting and debugging of ultra-high voltage power transmission and transformation project |
| CN111413893A (en) * | 2020-03-02 | 2020-07-14 | 国网江苏省电力有限公司电力科学研究院 | Wireless current acquisition system for starting debugging of ultra-high voltage power transmission and transformation project |
| CN111579860A (en) * | 2020-05-25 | 2020-08-25 | 青岛中加特电气股份有限公司 | Circuit device for collecting output voltage of frequency converter |
| CN111879997A (en) * | 2020-07-31 | 2020-11-03 | 中国人民解放军海军工程大学 | High-voltage input current output isolated type and high-precision voltage sensor |
| CN112327721A (en) * | 2020-11-20 | 2021-02-05 | 北京捍御者信息科技有限公司 | Control system and method of feedback switch |
| CN113866494A (en) * | 2021-11-03 | 2021-12-31 | 易事特集团股份有限公司 | Isolated form high voltage direct current sampling circuit |
| CN114113764A (en) * | 2021-11-03 | 2022-03-01 | 浙江吉利控股集团有限公司 | High-voltage sampling circuit and method |
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