CN109900947A - A kind of isolation voltage sample circuit for PWM rectifier - Google Patents
A kind of isolation voltage sample circuit for PWM rectifier Download PDFInfo
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- CN109900947A CN109900947A CN201910286960.1A CN201910286960A CN109900947A CN 109900947 A CN109900947 A CN 109900947A CN 201910286960 A CN201910286960 A CN 201910286960A CN 109900947 A CN109900947 A CN 109900947A
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Abstract
The present invention provides a kind of isolation voltage sampling technique scheme for PWM rectifier, including voltage follower circuit, isolating amplifier circuit, current-voltage conversion circuit, clamp circuit.The program realizes output quickly the following to input of isolating device, the linearity and dynamic responding speed that ensure that using linear optical coupling；Using the mode of two stage amplifer, common-mode rejection ratio and anti-interference ability are improved；It designs power frequency filter circuit and eliminates self-oscillation, filter out burr signal, reduce the output noise of circuit.The program has the advantages that the linearity is good, precision is high, temperature drift is small, strong antijamming capability, has extensive market prospects and application value in the four-quadrant inverter based on PWM rectifier.
Description
Technical field
The present invention relates to field of circuit technology, and in particular to a kind of isolation voltage sample circuit for PWM rectifier
Background technique
Pulse width modulate (Pulse Width Modulation, PWM) rectifier have energy in bidirectional flow, power because
Number is adjustable, grid side current sinusoidal and the adjustable feature of busbar voltage, and is widely applied to active power filtering, photovoltaic hair
Electricity, field of wind power generation.PWM rectifier itself has the characteristics that multivariable, non-linear, close coupling, therefore PWM rectifier system
The dynamic and static state performance of system is heavily dependent on its control method, and any control mode is required to the mould in circuit
Quasi- signal is sampled the working condition to determine system, is controlled accordingly system in time.But in voltage sample mistake
Cheng Zhong, various interference signals can be with so that making the sampling precision of measured signal reduces, making in measured signal metering-in control system
It is distorted at sampled signal and controls misalignment.
Summary of the invention
The present invention causes to solve various interference signals as measured signal enters in the control system of PWM rectifier
Sampling precision is low, be easy to cause the problem of sampled signal distorted signals and control misalignment, provide it is a kind of have loop area it is small,
The linearity is good, temperature drift is small, precision is high, the isolation voltage sample circuit of strong antijamming capability.
To achieve the goals above, the present invention is achieved by the following technical programs:
A kind of isolation voltage sample circuit for PWM rectifier is by voltage follower circuit, isolating amplifier circuit, electricity
Stream-voltage conversion circuit, clamp circuit composition；
The voltage follower circuit is made of resistance R1, resistance R2, resistance R3, operational amplifier U1.The voltage follow
The one end resistance R1 connects voltage signal Vin to be measured in circuit, and the one of the non-inverting input terminal of the other end and operational amplifier, resistance R2
End connection；The one end resistance R2 connects the non-inverting input terminal of operational amplifier U1, resistance R1, and the other end is connect with GND；Operation amplifier
The inverting input terminal of device U1 is connected by resistance R3 with the output end of operational amplifier, the non-inverting input terminal and electricity of operational amplifier
Hinder R1, resistance R2 connection.
The isolating amplifier circuit is by resistance R4, resistance R5 capacitor C1, operational amplifier U2, high-precision linear analog photoelectricity
Coupler U3 composition.The inverting input terminal of operational amplifier U2 passes through capacitor C1 and operational amplifier in the voltage feedback circuit
The output end of U2 connects；The inverting input terminal of operational amplifier U2 is connect by resistance R4 with the output end of operational amplifier U1,
The non-inverting input terminal of operational amplifier U2 connects GND.1 foot of photoelectrical coupler U3 is exported by resistance R4 and operational amplifier U2
End connection, 2 feet of photoelectrical coupler connect+15V power supply, 3 feet of photoelectrical coupler U3 and the reversed-phase output of operational amplifier U2
It is connected, 4 feet of photoelectrical coupler connect GND, the 5 feet connection GND of photoelectrical coupler U3 and same mutually defeated with operational amplifier U4
Enter end to be connected.
The current-voltage conversion circuit is made of resistance R6, resistance R7, capacitor C2, operational amplifier U4.The electricity
6 feet of the inverting input terminal connection photoelectrical coupler U3 of operational amplifier U4 in stream-voltage conversion circuit, operational amplifier U4's
Non-inverting input terminal connects GND and connect with 5 feet of photoelectrical coupler, and the inverting input terminal of operational amplifier U4 passes through resistance respectively
R3, capacitor C2 are connect with the output end of operational amplifier U4.
The clamp circuit includes resistance R8, diode D1, diode D2.The one end resistance R8 connects in the clamp circuit
Operational amplifier U4 output end, the other end connect the cathode of diode D1 and the anode of D2；Diode D1 anode connection+3.3V electricity
Source, diode D1 cathode connect diode D2 anode；Diode D2 anode connects GND.
The present invention has technical characteristics some in this way:
1, the operational amplifier U1, operational amplifier U2, operational amplifier U4 are OPA4350UA.
2, the photoelectrical coupler U3 is HCNR201.
3, the diode D1, diode D2 are Schottky diode.
4, resistance R1=300K, resistance R2=10K, resistance R3=100K in the voltage follower circuit；Isolation amplification electricity
Resistance R4=300K in road, resistance R5=1K, capacitor C1=0.001uF；Resistance R6=80K in current-voltage conversion circuit, electricity
R7=80K, capacitor C2=0.001uF are hindered, R8=5.1K in the clamp circuit.
Beneficial effects of the present invention:
1, it realizes that the output of isolating device changes with input terminal using linear optical coupling in voltage signal sampling circuit, guarantees
The higher linearity；Linear optical coupling HCNR201 has the advantages that fast response time, anti-common mode interference ability are strong, using linear
Optocoupler HCNR201 reduces the cost of circuit and improves the stability of voltage sampling circuit, the linearity, the voltage sampling circuit
It is not influenced by exchange input frequency, the effective sampling precision for improving voltage sample.
2, using two stage amplifer circuit, input impedance is big, and common-mode rejection ratio is high, effectively external disturbance can be inhibited to believe
Number；Due to use differential amplification mode, can effectively stable quiescent point, reduce device temperature drift caused by sampling error.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention
Related elements symbol description: resistance R1, R2, R3, R4, R5, R6, R7, R8, capacitor C1, C2, operational amplifier U1,
U2, U4, photoelectrical coupler U3.
Specific embodiment
In order to which the purpose of the present invention and technical solution is more clearly understood, below in conjunction with drawings and examples, to this hair
Bright application principle is described in detail.
In conjunction with Fig. 1, a kind of isolation voltage sample circuit for PWM rectifier is by voltage follower circuit, isolation amplification
Circuit, current-voltage conversion circuit, clamp circuit composition；
The voltage follower circuit is made of resistance R1, resistance R2, resistance R3, operational amplifier U1.The voltage follow
The one end resistance R1 connects voltage signal Vin to be measured in circuit, and the one of the non-inverting input terminal of the other end and operational amplifier, resistance R2
End connection；The one end resistance R2 connects the non-inverting input terminal of operational amplifier U1, resistance R1, and the other end is connect with GND；Operation amplifier
The inverting input terminal of device U1 is connected by resistance R3 with the output end of operational amplifier, the non-inverting input terminal and electricity of operational amplifier
Hinder R1, resistance R2 connection.
The isolating amplifier circuit is by resistance R4, resistance R5 capacitor C1, operational amplifier U2, high-precision linear analog photoelectricity
Coupler U3 composition.The inverting input terminal of operational amplifier U2 passes through capacitor C1 and operational amplifier in the voltage feedback circuit
The output end of U2 connects；The inverting input terminal of operational amplifier U2 is connect by resistance R4 with the output end of operational amplifier U1,
The non-inverting input terminal of operational amplifier U2 connects GND.1 foot of photoelectrical coupler U3 is exported by resistance R4 and operational amplifier U2
End connection, 2 feet of photoelectrical coupler connect+15V power supply, 3 feet of photoelectrical coupler U3 and the reversed-phase output of operational amplifier U2
It is connected, 4 feet of photoelectrical coupler connect GND, the 5 feet connection GND of photoelectrical coupler U3 and same mutually defeated with operational amplifier U4
Enter end to be connected.
The current-voltage conversion circuit is made of resistance R6, resistance R7, capacitor C2, operational amplifier U4.The electricity
6 feet of the inverting input terminal connection photoelectrical coupler U3 of operational amplifier U4 in stream-voltage conversion circuit, operational amplifier U4's
Non-inverting input terminal connects GND and connect with 5 feet of photoelectrical coupler, and the inverting input terminal of operational amplifier U4 passes through resistance respectively
R3, capacitor C2 are connect with the output end of operational amplifier U4.
The clamp circuit includes resistance R8, diode D1, diode D2.The one end resistance R8 connects in the clamp circuit
Operational amplifier U4 output end, the other end connect the cathode of diode D1 and the anode of D2；Diode D1 anode connection+3.3V electricity
Source, diode D1 cathode connect diode D2 anode；Diode D2 anode connects GND.
Voltage sampling circuit of the present invention, prime amplifier U1 constitute voltage follower circuit, wherein the accurate electricity of resistance R1, R2 composition
Hinder potential-divider network, in order to expand the range of measurement voltage, capacitor C1 has also filtered out circuit while playing feedback effect
In high frequency voltage burr signal.
Inside photoelectrical coupler HCNR201 comprising a high performance GaAs LED light tube, input photodiode and
Output photoelectric diode.LED light tube, which powers on, is, issue optically coupling to input photodiode and output photoelectric diode
For internal monitoring and constitute closed loop feedback, main function is the light output for stablizing LED light tube, therefore, LED light tube it is non-
Linear and drift characteristic can be almost completely eliminated, and output photoelectric diode then generates a kind of output optical line with LED light tube
The relevant photoelectric current of property, so that circuit system has high linearity and constant gain characteristic.
Amplifier U2, Light-emitting diode LED, photodiode PD1 constitute input circuit, two pole of photoelectricity together with Resistor-Capacitor Unit
Pipe PD1 is that amplifier U2 introduces negative-feedback, if Light-emitting diode LED luminous intensity changes, the size of amplifier input current with
The luminous intensity of light emitting diode is adjusted, so that stablizing the electric current for flowing through photodiode.Amplifier U4 LED P D2
Output circuit is constituted together with Resistor-Capacitor Unit, and the photo-signal for flowing through photodiode PD2 is converted into voltage signal.
Voltage sampling circuit input voltage and isolation circuit output voltage are linear changes, and amplification relationship can pass through electricity
The size of R4, R5, R6 are hindered to adjust.
In conclusion the embodiment of the present invention, a kind of isolation voltage sample circuit for PWM rectifier, in voltage signal
It realizes that the output of isolating device changes with input terminal using linear optical coupling in sample circuit, ensure that the higher linearity；Linearly
Optocoupler HCNR201 has the advantages that fast response time, anti-common mode interference ability are strong, reduces electricity using linear optical coupling HCNR201
The cost on road and the stability of voltage sampling circuit, the linearity are improved, the voltage sampling circuit is not by exchange input frequency
It influences, the effective sampling precision for improving voltage sample.Using two stage amplifer circuit, input impedance is big, and common-mode rejection ratio is high, can
Effectively to inhibit external interference signals；It designs power frequency filter circuit and eliminates self-oscillation, filter out burr signal, reduce circuit
Output noise.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Detailed explanation has been carried out to the present invention, those skilled in the art should understand that: it still can be to aforementioned each reality
Technical solution documented by example is applied to modify or equivalent replacement of some of the technical features；And these modification or
Person's replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (5)
1. a kind of isolation voltage sample circuit for PWM rectifier is by voltage follower circuit, isolating amplifier circuit, electric current-
Voltage conversion circuit, clamp circuit composition；
It is characterized by: the voltage follower circuit is made of resistance R1, resistance R2, resistance R3, operational amplifier U1.The electricity
Pressure follows one end resistance R1 in circuit to connect voltage signal Vin to be measured, non-inverting input terminal, the resistance of the other end and operational amplifier
One end of R2 connects；The one end resistance R2 connects the non-inverting input terminal of operational amplifier U1, resistance R1, and the other end is connect with GND；Fortune
The inverting input terminal for calculating amplifier U1 is connected by resistance R3 with the output end of operational amplifier, the homophase input of operational amplifier
End is connect with resistance R1, resistance R2.
The isolating amplifier circuit is coupled by resistance R4, resistance R5 capacitor C1, operational amplifier U2, high-precision linear analog photoelectricity
Device U3 composition.The inverting input terminal of operational amplifier U2 passes through capacitor C1's and operational amplifier U2 in the voltage feedback circuit
Output end connection；The inverting input terminal of operational amplifier U2 is connect by resistance R4 with the output end of operational amplifier U1, operation
The non-inverting input terminal of amplifier U2 connects GND.1 foot of photoelectrical coupler U3 is connected by resistance R4 and operational amplifier U2 output end
It connecing, 2 feet of photoelectrical coupler connect+15V power supply, and 3 feet of photoelectrical coupler U3 are connected with the reversed-phase output of operational amplifier U2,
4 feet of photoelectrical coupler connect GND, and 5 feet of photoelectrical coupler U3 connect GND and the non-inverting input terminal phase with operational amplifier U4
Even.
The current-voltage conversion circuit is made of resistance R6, resistance R7, capacitor C2, operational amplifier U4.Electric current-the electricity
6 feet of the inverting input terminal connection photoelectrical coupler U3 of operational amplifier U4, the same phase of operational amplifier U4 in voltage conversion circuit
Input terminal connection and is connect GND with 5 feet of photoelectrical coupler, the inverting input terminal of operational amplifier U4 pass through respectively resistance R3,
Capacitor C2 is connect with the output end of operational amplifier U4.
The clamp circuit includes resistance R8, diode D1, diode D2.The one end resistance R8 connects operation in the clamp circuit
Amplifier U4 output end, the other end connect the cathode of diode D1 and the anode of D2；Diode D1 anode connection+3.3V power supply,
Diode D1 cathode connects diode D2 anode；Diode D2 anode connects GND.
2. a kind of isolation voltage sample circuit for PWM rectifier according to claim 1, it is characterised in that: described
Operational amplifier U1, operational amplifier U2, operational amplifier U4 are OPA4350UA.
3. a kind of isolation voltage sample circuit for PWM rectifier according to claim 1, it is characterised in that: described
Photoelectrical coupler U3 is HCNR201.
4. a kind of isolation voltage sample circuit for PWM rectifier according to claim 1, it is characterised in that: described
Diode D1, diode D2 are Schottky diode.
5. a kind of isolation voltage sample circuit for PWM rectifier according to claim 1, it is characterised in that: described
Resistance R1=300K, resistance R2=10K, resistance R3=100K in voltage follower circuit；Resistance R4=in isolating amplifier circuit
300K, resistance R5=1K, capacitor C1=0.001uF；Resistance R6=80K in current-voltage conversion circuit, resistance R7=80K, electricity
Hold C2=0.001uF, R8=5.1K in the clamp circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910286960.1A CN109900947A (en) | 2019-04-11 | 2019-04-11 | A kind of isolation voltage sample circuit for PWM rectifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910286960.1A CN109900947A (en) | 2019-04-11 | 2019-04-11 | A kind of isolation voltage sample circuit for PWM rectifier |
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| CN109900947A true CN109900947A (en) | 2019-06-18 |
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| CN201910286960.1A Pending CN109900947A (en) | 2019-04-11 | 2019-04-11 | A kind of isolation voltage sample circuit for PWM rectifier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111379893A (en) * | 2020-03-20 | 2020-07-07 | 青岛中加特电气股份有限公司 | Device for controlling electromagnetic valve |
| CN112730969A (en) * | 2021-01-19 | 2021-04-30 | 刘龙丰 | Medical instrument sampling circuit for isolation detection |
| CN113156197A (en) * | 2021-05-25 | 2021-07-23 | 中国工程物理研究院机械制造工艺研究所 | Pulse power supply data acquisition system |
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