CN206292298U - A kind of high voltage converter output voltage isolates sample circuit - Google Patents
A kind of high voltage converter output voltage isolates sample circuit Download PDFInfo
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- CN206292298U CN206292298U CN201621265284.8U CN201621265284U CN206292298U CN 206292298 U CN206292298 U CN 206292298U CN 201621265284 U CN201621265284 U CN 201621265284U CN 206292298 U CN206292298 U CN 206292298U
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Abstract
The utility model discloses a kind of high voltage converter output voltage isolation sample circuit, it is characterised in that 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；Differential amplification modulate circuit, differential amplification modulate circuit is electrically connected with electric resistance partial pressure sample circuit；Light-coupled isolation sample circuit；Amplifier modulate circuit, amplifier modulate circuit is electrically connected with light-coupled isolation sample circuit.Voltage after processing of circuit of the present utility model is the digital-to-analog signal converter sampling pin voltage for meeting digital signal processing chip; send into the digital-to-analog signal converter sampling pin of digital signal processing chip; sampled by digital signal processing chip and calculation process, monitor the output voltage of high voltage converter in real time so as to control system and realize overvoltage protection, under-voltage protection, the lock mutually function such as bypass.
Description
Technical field
The utility model is related 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 stabilization 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 pressures, its detection method is in addition to accuracy to be ensured, 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 has the following disadvantages：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, influence 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 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.
Utility model content
For defect present in prior art, the purpose of this utility model is to provide a kind of high voltage converter output electricity
Pressure isolation sample circuit, has the advantages that accuracy of detection is high, circuit structure is succinct, convenient installation and device cost are low.
To achieve the above objectives, the utility model 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 step-down treatment is carried out to the output voltage；
Differential amplification modulate circuit, the differential amplification modulate circuit is electrically connected with the electric resistance partial pressure sample circuit, institute
The output voltage after differential amplification modulate circuit receives step-down treatment is stated, 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
The output voltage after light-coupled isolation sample circuit receives the differential amplification modulate circuit amplification and bias treatment is stated, 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 treatment 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 pressure sampling branch roads,
Three every electric resistance partial pressure sampling branch roads include multiple divider resistances being in series, every input of electric resistance partial pressure sampling branch road
One phase power output end of correspondence connection three-phase electricity, every output end of 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 with additive process computing
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 same additive process computing circuit, the output end of the same additive process computing circuit connect the optocoupler every
From the input of sample circuit.
On the basis of above-mentioned technical proposal, in the amplifying circuit, an one end of resistance R1 connects the resistance point
Pressure sample circuit, the resistance R1 other ends connect the positive input terminal of resistance R2 and operational amplifier U1, the one of resistance R3 respectively
The end connection electric resistance partial pressure sample circuit, connection resistance R4, electric capacity C1 and computing are put respectively for the resistance R3 other ends connection
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 the other end of the resistance R4 and the input of the same additive process computing circuit respectively.
On the basis of above-mentioned technical proposal, in the same additive process computing 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 the negative input end of one end of resistance R9, one end of electric capacity C2 and operational amplifier U2 respectively, described
The output end of operational amplifier U2 connects the other end of the electric capacity C2 and one end of resistance R10 respectively, and the resistance R10's is another
One end connects the other end of the R9 and the input of the light-coupled isolation sample circuit respectively.
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 concatenation operation amplifier U4, the negative input end and output end of the operational amplifier U4 is held to be connected with resistance R12,
One end of the output end connection resistance R14 of the operational amplifier U4, 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 one end of resistance R15, electric capacity C3 respectively
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 connect the computing and put
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 output voltage after the differential amplification modulate circuit is processed step-down is amplified and biases
The scope of the output voltage after treatment is 0~5V.
Compared with prior art, the utility model has the advantage of：
1) a kind of high voltage converter output voltage isolation sample circuit of the present utility model, by electric resistance partial pressure sample circuit
The high voltage that high voltage converter is exported is carried out into partial pressure decay, the voltage after differential amplification modulate circuit is decayed to partial pressure is further
The voltage that decay and bias treatment are obtained is carried out, is easy to the light-coupled isolation sample circuit of rear class to work, light-coupled isolation sample circuit
Using high-linearity analogy optocoupler carries out voltage transmission, 1:1 transfer ratio ensure that the voltage before and after isolation is basically identical,
The distortion factor is low, while realizing the security isolation of height laminate section again, protects late-class circuit and main control chip, it is to avoid burn out master control core
Piece and cause the situation of whole control failure to occur.
2) in a kind of high voltage converter output voltage isolation sample circuit of the present utility model, light-coupled isolation sample circuit it
Voltage afterwards is again by after the following of amplifier modulate circuit, 3.3V bias treatments, being converted to and meeting digital signal processing chip
Digital-to-analog signal converter sampling pin voltage, the digital-to-analog signal converter sampling for sending into digital signal processing chip is drawn
Pin, is sampled and calculation process by digital signal processing chip, monitors the defeated of high voltage converter in real time so as to control system
Go out voltage and realize overvoltage protection, under-voltage protection, the lock mutually function such as bypass.
Brief description of the drawings
Fig. 1 is the structured flowchart of output voltage isolation sample circuit in the utility model embodiment；
Fig. 2 is the circuit diagram of electric resistance partial pressure sample circuit in the utility model embodiment；
Fig. 3 is the circuit diagram of differential amplification modulate circuit in the utility model embodiment；
Fig. 4 is the circuit diagram of light-coupled isolation sample circuit in the utility model embodiment；
Fig. 5 is the circuit diagram of amplifier modulate circuit in the utility model embodiment.
Specific embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
Shown in Figure 1, the utility model embodiment provides a kind of high voltage converter output voltage isolation sample circuit, bag
Include：
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 step-down treatment is carried out to output voltage；
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 treatment, 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 the output voltage after the amplification of differential amplification modulate circuit and 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, and amplifier modulate circuit receives light
Output voltage after coupling isolation sample circuit insulation blocking transmission, and amplifier treatment 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 pressure sampling branch roads, every electric resistance partial pressure sampling
Branch road includes multiple resistant series divider resistances, every phase of the input correspondence connection three-phase electricity of 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；One input connection of 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 with additive process computing circuit, the input connection electricity of amplifying circuit
The output end of pressure sampling circuit is hindered, the output end of amplifying circuit is connected with the input of additive process computing 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, an one end of resistance R1 connects the U_Low ends of electric resistance partial pressure sample circuit,
The resistance R1 other ends connect the positive input terminal of resistance R2 and operational amplifier U1 respectively, 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 resistance R4, the negative input of electric capacity C1 and operational amplifier U1 respectively
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 connect respectively
The other end of connecting resistance R4 and the input with additive process computing circuit.Differential amplification modulate circuit is to the output after step-down treatment
It is 0~5V that voltage is amplified with the scope of the output voltage after bias treatment.
With in additive process computing 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 one end of resistance R9, electric capacity C2 respectively
One end and the negative input end of operational amplifier U2, the output end of operational amplifier U2 connect the other end and resistance of electric capacity C2 respectively
One end of R10, the other end of resistance R10 connects the other end and output end U_Sample of R9 respectively.By same additive process computing
Discharge circuit in circuit adds 5V bias voltages, and the voltage signal by obtaining 0 to 5V after add operation is easy to rear class optocoupler
Sample circuit works.PF grades of 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 conditionings of output end connection the resistance R11, operational amplifier U3 of end and operational amplifier U3
The input of circuit.Voltage transmission, 1 are carried out using high-linearity analogy optocoupler in the present embodiment:1 transfer ratio ensure that isolation
Front and rear voltage is basically identical, and the distortion factor is low, while realizing the security isolation of height laminate section again, protects 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 operations 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
One end of output end connection 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 one end of one end of resistance R15, one end of electric capacity C3 and resistance R16, the other end of resistance R15 respectively
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.Process is followed voltage after the isolation sampling of light-coupled isolation sample circuit again, 3.3V is biased
After treatment, 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, monitored in real time so as to control system high voltage converter output voltage and realize overvoltage protection, under-voltage protection,
Lock the mutually function such as bypass.
The utility model is not limited to above-mentioned implementation method, for those skilled in the art, not
On the premise of departing from the utility model principle, some improvements and modifications can also be made, these improvements and modifications are also considered as this reality
Within new protection domain.The content not being described in detail in this specification belongs to known to professional and technical personnel in the field
Prior art.
Claims (8)
1. a kind of high voltage converter output voltage isolates sample circuit, it is characterised in that including：
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 step-down treatment is carried out to the output voltage；
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 receives step-down treatment, 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 output voltage after the differential amplification modulate circuit amplification and 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 treatment 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 three electric resistance partial pressure sampling branch roads, and three every electric resistance partial pressure sampling branch roads include what multiple was in series
Divider resistance, every phase power output end of the input correspondence connection three-phase electricity of 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 with additive process computing circuit, and the input of the amplifying circuit connects the resistance point
The output end of sample circuit is pressed, the output end of the amplifying circuit connects the input of the same additive process computing circuit, described
The input of the light-coupled isolation sample circuit is connected with the output end of additive process computing 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, an one end of resistance R1 connects the electric resistance partial pressure sample circuit, and the resistance R1 other ends connect resistance respectively
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 resistance R4, the negative input end of electric capacity C1 and operational amplifier U1 respectively, 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 the another of the resistance R4 respectively
End and the input of the same additive process computing circuit.
5. a kind of high voltage converter output voltage as claimed in claim 3 isolates sample circuit, it is characterised in that：The same phase
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 one end of resistance R9, electric capacity respectively
One end of C2 and the negative input end of operational amplifier U2, the output end of the operational amplifier U2 connect the electric capacity C2's respectively
One end of the other end and resistance R10, the other end of the resistance R10 connects the other end of the R9 and the light-coupled isolation respectively
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 the input that end connects the output end connection amplifier modulate circuit of resistance R11, the operational amplifier U3.
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 are connected with the one of the output end connection resistance R14 of resistance R12, the operational amplifier U4
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 connection resistance R13 one end, the other end of the resistance R13 accesses+3.3V bias voltages, and the operational amplifier U5's is negative
Input connects one end of one end of resistance R15, one end of electric capacity C3 and resistance R16, another termination of the resistance R15 respectively
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 connection resistance R17 one end, 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 treatment is amplified with the scope of the output voltage after bias treatment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621265284.8U CN206292298U (en) | 2016-11-11 | 2016-11-11 | A kind of high voltage converter output voltage isolates sample circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621265284.8U CN206292298U (en) | 2016-11-11 | 2016-11-11 | A kind of high voltage converter output voltage isolates sample circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106645905A (en) * | 2016-11-11 | 2017-05-10 | 大禹电气科技股份有限公司 | Output voltage isolation sampling circuit of high-voltage inverter |
| CN108872803A (en) * | 2018-03-29 | 2018-11-23 | 福建工程学院 | A kind of detection method of the transformer insulation state based on dielectric return voltage |
| CN109212303A (en) * | 2018-10-22 | 2019-01-15 | 大禹电气科技股份有限公司 | Digital signal samples processing circuit for high-voltage frequency converter |
| CN110829400A (en) * | 2019-10-25 | 2020-02-21 | 天津航空机电有限公司 | Analog quantity acquisition lightning protection 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 |
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2016
- 2016-11-11 CN CN201621265284.8U patent/CN206292298U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106645905A (en) * | 2016-11-11 | 2017-05-10 | 大禹电气科技股份有限公司 | Output voltage isolation sampling circuit of high-voltage inverter |
| CN106645905B (en) * | 2016-11-11 | 2023-06-30 | 大禹电气科技股份有限公司 | Output voltage isolation sampling circuit of high-voltage frequency converter |
| CN108872803A (en) * | 2018-03-29 | 2018-11-23 | 福建工程学院 | A kind of detection method of the transformer insulation state based on dielectric return voltage |
| CN108872803B (en) * | 2018-03-29 | 2020-12-08 | 福建工程学院 | Method for detecting insulation state of transformer based on insulation medium return voltage |
| CN109212303A (en) * | 2018-10-22 | 2019-01-15 | 大禹电气科技股份有限公司 | Digital signal samples processing circuit for high-voltage frequency converter |
| CN110829400A (en) * | 2019-10-25 | 2020-02-21 | 天津航空机电有限公司 | Analog quantity acquisition lightning protection 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 |
| CN110850761B (en) * | 2019-10-25 | 2022-11-01 | 天津航空机电有限公司 | High-precision analog quantity acquisition circuit |
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