CN114070109B - Control circuit and control method of three-level in-line circuit - Google Patents
Control circuit and control method of three-level in-line circuit Download PDFInfo
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- CN114070109B CN114070109B CN202111319331.8A CN202111319331A CN114070109B CN 114070109 B CN114070109 B CN 114070109B CN 202111319331 A CN202111319331 A CN 202111319331A CN 114070109 B CN114070109 B CN 114070109B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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Abstract
The invention discloses a control circuit and a control method of a three-level linear circuit, wherein the circuit comprises: the output voltage sampling circuit comprises a voltage sampling end for sampling; the system control circuit is connected with the output voltage sampling circuit; the sine wave rectification conversion circuit is connected with the system control circuit; the positive and negative half cycle judging circuit is connected with the system control circuit and outputs a positive and negative half cycle switching signal; the PWM wave generating circuit is connected with the sine wave rectifying and converting circuit and outputs a pulse control signal; the driving converter is connected with the positive and negative half cycle judging circuit and the PWM wave generating circuit and controls the three-level linear circuit. The invention has the effects of reducing the cost of the control circuit and facilitating the control of the three-level linear circuit.
Description
Technical Field
The invention relates to the field of UPS inverter circuit control, in particular to a control circuit and a control method of a three-level linear circuit.
Background
With the increasing popularity of high-power switching power supplies, such as Uninterruptible Power Supplies (UPS), three-level inverter circuits with high efficiency and low harmonics are increasingly used by product developers.
In the related art, the UPS inversion adopts a three-level in-line topology, and referring to fig. 1, the circuit is generally based on a digital control DSP and adopts PI dual-loop control.
With respect to the above related art, the inventors consider that the DSP is expensive and the PI controller is additionally expensive, resulting in a disadvantage of high cost of the control circuit.
Disclosure of Invention
In order to reduce the cost of a control circuit and facilitate the control of a three-level linear circuit, the application discloses a control circuit and a control method of the three-level linear circuit.
In a first aspect, the application discloses a control circuit of a three-level linear circuit, which adopts the following technical scheme:
a control circuit for a three-level in-line circuit, comprising:
The output voltage sampling circuit comprises a voltage sampling end and a first output end, wherein the voltage sampling end is used for being connected with the voltage output end of the three-level linear circuit and used for sampling the output voltage of the three-level linear circuit, and the first output end is used for outputting a voltage sampling signal according to the output voltage of the three-level linear circuit;
The system control circuit comprises a first signal receiving end, a second signal receiving end and a control end, wherein the first signal receiving end is connected with the first output end, the second signal receiving end is used for accessing a reference wave signal, and the control end is used for outputting a primary control signal according to a voltage sampling signal and the reference wave signal;
The sine wave rectification conversion circuit comprises a third signal receiving end, a current sampling end and a second output end, wherein the third signal receiving end is connected with the control end and used for receiving a primary control signal, the current sampling end is connected with the three-level linear circuit and used for sampling the output current of the three-level linear circuit, and the second output end is used for outputting a half-wave control signal according to the primary control signal and the output current;
The positive and negative half cycle judging circuit comprises a fourth signal receiving end and a third output end, wherein the fourth signal receiving end is connected with the control end and is used for receiving a primary control signal, and the third output end is used for outputting a positive and negative half cycle switching signal according to the primary control signal;
The PWM wave generation circuit comprises a fifth signal receiving end, a sixth signal receiving end and a fourth output end, wherein the fifth signal receiving end is connected with the second output end and is used for receiving a half-wave control signal, the sixth signal receiving end is used for being connected with a triangular carrier wave, and the fourth output end is used for outputting a pulse control signal according to the half-wave control signal and the triangular carrier wave;
The driving converter comprises a positive half-cycle switching signal receiving end, a pulse control signal receiving end, a first driving signal, a second driving signal, a third driving signal and a fourth driving signal, wherein the positive half-cycle switching signal receiving end is connected with a third output end, the pulse control signal receiving end is connected with a fourth output end, and the first driving signal, the second driving signal, the third driving signal and the fourth driving signal are all connected with a three-level linear circuit and are used for controlling the three-level linear circuit.
Through adopting above-mentioned technical scheme, output voltage acquisition circuit gathers contravariant output voltage, system control circuit outputs primary control signal according to voltage sampling signal and the reference wave of switch-in, primary control signal forms pulse control signal after sine wave rectification conversion circuit and PWM wave generation circuit, output positive negative half cycle switching signal after positive negative half cycle judgement circuit, pulse control signal and positive negative half cycle switching signal are controlled three-level straight line type circuit after driving the converter, whole circuit need not to adopt PI dicyclo control based on digital control DSP, thereby reduce control circuit's cost and be convenient for control three-level straight line type circuit.
Optionally, the output voltage sampling circuit includes a fourteenth resistor R14, a fifteenth resistor R15, a first resistor R1, a second resistor R2, and a first operational amplifier U1A, where one end of the fourteenth resistor R14 is connected to one end of the second resistor R2 and a negative input end of the first operational amplifier U1A, and the other end of the second resistor R2 is connected to an output end of the first operational amplifier U1A, and an output end of the first operational amplifier U1A is a first output end;
one end of the fifteenth resistor R15 is connected with one end of the first resistor R1 and the positive electrode input end of the first operational amplifier U1A, and the other end of the first resistor R1 is grounded;
the other end of the fourteenth resistor R14 and the other end of the fifteenth resistor R15 are voltage sampling terminals.
By adopting the technical scheme, the inverter output voltage is more stably and accurately sampled, voltage sampling signals are output after operational amplification, and the cost of each component is lower, so that the cost of a control circuit is reduced, and the control of a three-level linear circuit is facilitated.
Optionally, the system control circuit includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a second operational amplifier U1B, where one end of the first capacitor C1 is connected to the negative input terminal of the second operational amplifier U1B, the other end of the first capacitor C1 is connected to one end of the third resistor R3, the other end of the third resistor R3 is a first signal receiving terminal and is connected to one end of the output terminal of the first operational amplifier U1A, one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5, one end of the second capacitor C2, one end of the third capacitor C3, one end of the negative input terminal of the second operational amplifier U1B, the other end of the second capacitor C2 is connected to one end of the sixth resistor R6, and the other end of the fifth resistor R5 is connected to the other end of the output terminal of the third resistor U1B, and the other end of the fourth resistor R5 is an output terminal of the third operational amplifier U1B;
The positive input end of the second operational amplifier U1B is a second signal receiving end and is used for accessing reference waves.
By adopting the technical scheme, the amplified primary control signal is output according to the voltage sampling signal and the reference wave and in combination with the electronic element.
Optionally, the sine wave rectification and conversion circuit includes a seventh resistor R7, a ninth resistor R9, an eleventh resistor R11, a first diode D1, and a third operational amplifier U1C, where a negative input end of the third operational amplifier U1C is connected to one end of the eleventh resistor R11, one end of the seventh resistor R7, and one end of the ninth resistor R9, another end of the seventh resistor R7 is a current sampling end, another end of the ninth resistor R9 is a third signal receiving end and is connected between the control end and the fourth signal receiving end, another end of the eleventh resistor R11 is connected to a cathode of the first diode D1, an anode of the first diode D1 is connected to an output end of the third operational amplifier U1C, and a cathode of the first diode D1 is a second output end and is connected to a fifth signal receiving end;
The positive input end of the third operational amplifier U1C is grounded.
By adopting the technical scheme, the primary control signal is better and faster preprocessed, and the sine wave is rectified into a half wave.
Optionally, the positive and negative half cycle judging circuit includes an eighth resistor R8, a tenth resistor R10, a twelfth resistor R12, a zener diode ZD1, and a fourth operational amplifier U2A, where the negative input end of the fourth operational amplifier U2A is a fourth signal receiving end and is connected to the ninth resistor R9 and the output end of the second operational amplifier U1B, the positive input end of the fourth operational amplifier U2A is connected to one end of the eighth resistor R8 and one end of the tenth resistor R10, the other end of the eighth resistor R8 is grounded, the other end of the tenth resistor R10 is connected to the output end of the fourth operational amplifier U2A and one end of the twelfth resistor R12, the other end of the twelfth resistor R12 is connected to the cathode of the zener diode ZD1, and the anode of the zener diode ZD1 is grounded;
the other end of the twelfth resistor R12 is a third output end.
By adopting the technical scheme, the method is beneficial to processing the primary control signal into the positive and negative half-cycle switching signal faster so as to control the three-level linear circuit.
Optionally, the PWM wave generating circuit includes a voltage comparator U3A and a thirteenth resistor R13, where a negative input end of the voltage comparator U3A is a sixth signal receiving end and is used for accessing a triangular carrier, an positive input end of the voltage comparator U3A is a fifth signal receiving end and is connected with a cathode of the first diode D1, an output end of the voltage comparator U3A is a fourth output end and is connected with one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is connected with the power VCC.
By adopting the technical scheme, the method is beneficial to faster generation of pulse control signals so as to control the three-level in-line circuit, and has lower cost.
The application discloses a control method of a three-level linear circuit, which adopts the following technical scheme:
a control method of a three-level in-line circuit comprises the following steps:
Designing a control circuit of a three-level linear circuit to obtain a first control circuit;
obtaining a transfer function of a system control circuit according to the first control circuit;
simplifying and transforming based on the transfer function of the system control circuit to obtain controller parameters;
Simulating the controller parameters and the controlled object by using matlab according to the controller parameters;
According to the simulation result, the first control circuit is adjusted until the simulation result of the first control circuit is that the angular frequency is 20K, the system is kept stable, and the first control circuit is consistent with the control circuit of any three-level linear circuit to obtain a second control circuit;
Constructing a circuit according to the second control circuit and connecting the circuit with a three-level linear circuit;
a reference wave is input to the second signal receiving end, a triangular carrier is input to the sixth signal receiving end, and the control of the three-level linear circuit is realized; the reference wave is a sine wave formed by filtering pulses with equal amplitude and unequal widths by software according to sine wave chopping through a circuit.
Through adopting above-mentioned technical scheme, after the design and adjustment overall circuit, output primary control signal according to voltage sampling signal and the reference wave of switch-in, primary control signal forms pulse control signal and positive and negative half cycle switching signal after processing, and pulse control signal and positive and negative half cycle switching signal are controlled three-level straight line type circuit after driving the converter, and overall circuit need not to adopt PI dicyclo control based on digital control DSP to reduce control circuit's cost and be convenient for control three-level straight line type circuit.
Optionally, when the first control circuit is adjusted to be the second control circuit, the calculating step of the controller parameter of the second control circuit includes:
Calculating equivalent impedance of each part of the system control circuit according to the circuit structure of the second control circuit and according to the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the first capacitor C1, the second capacitor C2 and the third capacitor C3;
Obtaining a transfer function of a system control circuit according to the equivalent impedance of each part;
simplifying and equivalent transfer functions of a system control circuit, and converting the transfer functions into zero-pole transfer functions;
And obtaining the controller parameters according to the equivalent impedance of each part and the transfer function of the zero pole point type.
By adopting the technical scheme, the controller parameters are calculated accurately and rapidly, the design, adjustment and verification of the circuit are facilitated, the stability of controlling the three-level linear circuit is further improved, the cost of the control circuit is reduced, and the control of the three-level linear circuit is facilitated.
Optionally, the transfer function of the zero pole point mode is: Wherein 、、、；
The controller parameter is。
By adopting the technical scheme, the accuracy of the controller parameters is further improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. The system control circuit outputs a primary control signal according to a voltage sampling signal and an accessed reference wave, the primary control signal forms a pulse control signal after passing through a sine wave rectification and conversion circuit and a PWM wave generation circuit, a positive half-cycle switching signal is output after passing through a positive half-cycle judgment circuit, the pulse control signal and the positive half-cycle switching signal control a three-level linear circuit after passing through a driving converter, and the whole circuit does not need to adopt PI double-loop control based on a digital control DSP, so that the cost of the control circuit is reduced, and the three-level linear circuit is convenient to control.
2. The method is beneficial to faster generation of pulse control signals so as to control the three-level in-line circuit, and has lower cost.
3. The controller parameter calculation method is beneficial to accurately and quickly calculating the controller parameter, is beneficial to designing, adjusting and verifying the circuit, and further improves the stability of controlling the three-level linear circuit, so that the cost of the control circuit is reduced, and the control of the three-level linear circuit is facilitated.
Drawings
Fig. 1 is a schematic circuit connection diagram of a three-level linear circuit in the present application.
Fig. 2 is a schematic circuit connection diagram of a control circuit of a three-level in-line circuit according to an embodiment of the application.
Fig. 3 is a flow chart of a control method of a three-level in-line circuit according to an embodiment of the application.
Fig. 4 is a flowchart of the steps for calculating the controller parameters of the second control circuit according to the embodiment of the present application.
Reference numerals illustrate:
1. An output voltage sampling circuit; 2. a system control circuit; 3. a sine wave rectifying and converting circuit; 4. a positive and negative half cycle judgment circuit; 5. a PWM wave generation circuit; 6. the transducer is driven.
Detailed Description
The application is described in further detail below with reference to fig. 1-4.
Referring to fig. 1, the three-level in-line circuit works as follows:
The driving tube Q1 and the driving tube Q3 are in a complementary relationship, and the driving tube Q2 and the driving tube Q4 are in a complementary relationship;
Inversion is at positive half cycle: PWM2 is high level, and the driving tube Q2 is conducted; PWM4 is low level, and driving tube Q4 is cut off; PWM1 and PWM3 form a high frequency (19.2 KHZ) switch; PWM1 is high level driving tube Q1 to be conducted, PWM3 is low level, and driving tube Q3 is cut off; the current direction sequentially passes through the positive electrode of the capacitor C4, the driving tube Q1, the driving tube Q2, the inductor L1, the capacitor C6, the GND and the negative electrode of the capacitor C4, and the capacitor C4 discharges.
PWM1 is low level, drive tube Q1 is cut off, PWM3 is low level, drive tube Q3 is cut off, the current direction is through GND, diode D3, drive tube Q2, inductance L, electric capacity C6, GND in proper order, energy feedback is on bus capacitor C4.
Inversion is at negative half cycle: PWM1 is low, Q1 is not conductive; PWM3 is high and Q3 is on. PWM2 and PWM4 form high frequency (19.2 KHz) switching. PWM4 is turned on by high level Q4, PWM2 is turned off by low level Q2; the current direction sequentially passes through the negative electrode C5, the negative electrode Q4, the positive electrode Q3, the positive electrode L, C, the negative electrode GND and the positive electrode C5, and the capacitor C5 discharges.
PWM4 is off at low level Q4, PWM2 is off at low level Q2: the current direction is through GND, D2, Q3, L, C, GND in turn, and energy is fed back to busbar C5.
The transfer function of the controlled object (neglecting the equivalent resistance of capacitance) when the inversion output is idle is that. Taking 1K as an example, l=1mh, c=4.7x -6,rL =0.1 ohm, and matlab simulation results in a system instability when the angular frequency is 20K. Therefore, on the premise of reducing the cost, the control circuit and the control method of the three-level linear circuit disclosed by the application are needed to control.
Referring to fig. 2, the present application discloses a control circuit of a three-level in-line circuit.
A control circuit for a three-level in-line circuit, comprising:
The output voltage sampling circuit 1 comprises a voltage sampling end and a first output end, wherein the voltage sampling end is used for being connected with the voltage output end of the three-level linear circuit and used for sampling the output voltage of the three-level linear circuit, and the first output end is used for outputting a voltage sampling signal according to the output voltage of the three-level linear circuit;
the system control circuit 2 comprises a first signal receiving end, a second signal receiving end and a control end, wherein the first signal receiving end is connected with the first output end, the second signal receiving end is used for accessing a reference wave signal, and the control end is used for outputting a primary control signal according to a voltage sampling signal and the reference wave signal;
The sine wave rectification and conversion circuit 3 comprises a third signal receiving end, a current sampling end and a second output end, wherein the third signal receiving end is connected with the control end and is used for receiving a primary control signal, the current sampling end is connected with the three-level linear circuit and is used for sampling the output current of the three-level linear circuit, and the second output end is used for outputting a half-wave control signal according to the primary control signal and the output current;
The positive and negative half cycle judging circuit 4 comprises a fourth signal receiving end and a third output end, wherein the fourth signal receiving end is connected with the control end and is used for receiving the primary control signal, and the third output end is used for outputting a positive and negative half cycle switching signal according to the primary control signal;
The PWM wave generating circuit 5 includes a fifth signal receiving end, a sixth signal receiving end, and a fourth output end, where the fifth signal receiving end is connected to the second output end and is used to receive the half-wave control signal, the sixth signal receiving end is used to access the triangular carrier, and the fourth output end is used to output the pulse control signal according to the half-wave control signal and the triangular carrier;
the driving converter 6 comprises a positive and negative half-cycle switching signal receiving end, a pulse control signal receiving end, a first driving signal end, a second driving signal end, a third driving signal end and a fourth driving signal end, wherein the positive and negative half-cycle switching signal receiving end is connected with the third output end, the pulse control signal receiving end is connected with the fourth output end, and the first driving signal end, the second driving signal end, the third driving signal end and the fourth driving signal end are all connected with a three-level linear circuit and are used for controlling the three-level linear circuit.
Specifically, the output voltage sampling circuit 1 includes a fourteenth resistor R14, a fifteenth resistor R15, a first resistor R1, a second resistor R2, and a first operational amplifier U1A, one end of the fourteenth resistor R14 is connected to one end of the second resistor R2 and a negative input terminal of the first operational amplifier U1A, the other end of the second resistor R2 is connected to an output terminal of the first operational amplifier U1A, and an output terminal of the first operational amplifier U1A is a first output terminal. One end of the fifteenth resistor R15 is connected to one end of the first resistor R1 and the positive input terminal of the first operational amplifier U1A, and the other end of the first resistor R1 is grounded. The other end of the fourteenth resistor R14 and the other end of the fifteenth resistor R15 are voltage sampling terminals.
The system control circuit 2 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a second operational amplifier U1B, one end of the first capacitor C1 is connected to the negative input terminal of the second operational amplifier U1B, the other end of the first capacitor C1 is connected to one end of the third resistor R3, the other end of the third resistor R3 is a first signal receiving terminal and is connected to the output terminal of the first operational amplifier U1A, one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5, one end of the second capacitor C2, one end of the third capacitor C3, the negative input terminal of the second operational amplifier U1B, the other end of the second capacitor C2 is connected to one end of the sixth resistor R6, the other end of the fifth resistor R5 is connected to the other end of the sixth resistor R6, the other end of the third resistor C3, the output terminal of the second operational amplifier U1B, and the output terminal of the second operational amplifier U1B. The positive input end of the second operational amplifier U1B is a second signal receiving end and is used for accessing the reference wave. The reference wave is a sine wave formed by filtering pulses with equal amplitude and unequal widths by software according to sine wave chopping through a circuit.
The sine wave rectification and conversion circuit 3 comprises a seventh resistor R7, a ninth resistor R9, an eleventh resistor R11, a first diode D1 and a third operational amplifier U1C, wherein the negative input end of the third operational amplifier U1C is connected with one end of the eleventh resistor R11, one end of the seventh resistor R7 and one end of the ninth resistor R9, the other end of the seventh resistor R7 is a current sampling end, the other end of the ninth resistor R9 is a third signal receiving end and is connected between the control end and the fourth signal receiving end, the other end of the eleventh resistor R11 is connected with the cathode of the first diode D1, the anode of the first diode D1 is connected with the output end of the third operational amplifier U1C, and the cathode of the first diode D1 is a second output end and is connected with the fifth signal receiving end. The positive input end of the third operational amplifier U1C is grounded.
The positive and negative half cycle judging circuit 4 comprises an eighth resistor R8, a tenth resistor R10, a twelfth resistor R12, a zener diode ZD1 and a fourth operational amplifier U2A, wherein the negative input end of the fourth operational amplifier U2A is a fourth signal receiving end and is connected with the ninth resistor R9 and the output end of the second operational amplifier U1B, the positive input end of the fourth operational amplifier U2A is connected with one end of the eighth resistor R8 and one end of the tenth resistor R10, the other end of the eighth resistor R8 is grounded, the other end of the tenth resistor R10 is connected with the output end of the fourth operational amplifier U2A and one end of the twelfth resistor R12, the other end of the twelfth resistor R12 is connected with the cathode of the zener diode ZD1, and the anode of the zener diode ZD1 is grounded. The other end of the twelfth resistor R12 is a third output terminal.
The PWM wave generating circuit 5 includes a voltage comparator U3A and a thirteenth resistor R13, where a negative input end of the voltage comparator U3A is a sixth signal receiving end and is used for accessing a triangular carrier, an positive input end of the voltage comparator U3A is a fifth signal receiving end and is connected with a cathode of the first diode D1, an output end of the voltage comparator U3A is a fourth output end and is connected with one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is connected with the power VCC.
The drive converter 6 is used to convert HLPWM, HPWM, VCC and GND through gates to form the drive PWM1-PWM4 for the drive tube. The first driving signal end, the second driving signal end, the third driving signal end and the fourth driving signal end are respectively connected with corresponding driving pipes.
Referring to fig. 3, the application also discloses a control method of the three-level in-line circuit.
A control method of a three-level in-line circuit comprises the following steps:
S1, designing a control circuit of a three-level linear circuit to obtain a first control circuit.
S2, obtaining a transfer function of the system control circuit according to the first control circuit.
S3, simplifying and transforming based on the transfer function of the system control circuit to obtain the controller parameters.
And S4, simulating the controller parameters and the controlled object by using matlab according to the controller parameters.
And S5, adjusting the first control circuit according to the simulation result until the simulation result of the first control circuit is that the angular frequency is 20K, and the system is kept stable, and the first control circuit is consistent with the control circuit of the three-level linear circuit to obtain a second control circuit.
S6, constructing a circuit according to the second control circuit and connecting the circuit with the three-level linear circuit.
S7, inputting a reference wave for the second signal receiving end, and inputting a triangular carrier for the sixth signal receiving end, so as to control the three-level linear circuit.
S2 and S3 are illustrated with the first control circuit being adjusted to the second control circuit. Referring to fig. 4, the calculating step of the controller parameter of the second control circuit includes:
A1, calculating equivalent impedance of each part of the system control circuit according to the circuit structure of the second control circuit and according to the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the first capacitor C1, the second capacitor C2 and the third capacitor C3.
Specifically, the first impedance Z1 is equivalent in series according to the third resistor R3 and the fourth capacitor C4; the second impedance Z2 is equivalent according to the parallel connection of the third resistor R3 and the fourth capacitor C4 and the fourth resistor R4 after the series connection; a third impedance Z3 is equivalent in series according to the sixth resistor R6 and the second capacitor C2; a fourth impedance Z4 is equivalent according to the parallel connection of the fifth resistor R5 and the third capacitor C3; the network fifth resistor R5, the second capacitor C2, the sixth resistor R6 and the third capacitor C3 are equivalent to a fifth impedance Z5.
Wherein,，，，，。
A2, obtaining a transfer function of the system control circuit according to the equivalent impedance of each part.
Specifically, the transfer function of the controller formed by the operational amplifier U1B is as follows:
。
And A3, simplifying and equivalent transfer functions of a system control circuit, and converting the transfer functions into zero pole point type transfer functions.
Specifically, since the coefficients of R5, R6, C2, and C3 are very small, they are negligible for ease of design, and thus the equation above can be simplified and equivalent to:
；
the transfer function of the zero pole point is as follows: Wherein 、、、。
And A4, obtaining the controller parameters according to the equivalent impedance of each part and the transfer function of the zero pole point type.
Specifically, the controller parameters are. The controller parameters and the controlled object are simulated by using matlab, and the result is that: at an angular frequency of 20K, the phase margin is 68 ° and the system is stable.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (9)
1. A control circuit for a three-level in-line circuit, comprising:
The output voltage sampling circuit comprises a voltage sampling end and a first output end, wherein the voltage sampling end is used for being connected with the voltage output end of the three-level linear circuit and used for sampling the output voltage of the three-level linear circuit, and the first output end is used for outputting a voltage sampling signal according to the output voltage of the three-level linear circuit;
The system control circuit comprises a first signal receiving end, a second signal receiving end and a control end, wherein the first signal receiving end is connected with the first output end, the second signal receiving end is used for accessing a reference wave signal, and the control end is used for outputting a primary control signal according to a voltage sampling signal and the reference wave signal;
The sine wave rectification conversion circuit comprises a third signal receiving end, a current sampling end and a second output end, wherein the third signal receiving end is connected with the control end and used for receiving a primary control signal, the current sampling end is connected with the three-level linear circuit and used for sampling the output current of the three-level linear circuit, and the second output end is used for outputting a half-wave control signal according to the primary control signal and the output current;
The positive and negative half cycle judging circuit comprises a fourth signal receiving end and a third output end, wherein the fourth signal receiving end is connected with the control end and is used for receiving a primary control signal, and the third output end is used for outputting a positive and negative half cycle switching signal according to the primary control signal;
The PWM wave generation circuit comprises a fifth signal receiving end, a sixth signal receiving end and a fourth output end, wherein the fifth signal receiving end is connected with the second output end and is used for receiving a half-wave control signal, the sixth signal receiving end is used for being connected with a triangular carrier wave, and the fourth output end is used for outputting a pulse control signal according to the half-wave control signal and the triangular carrier wave;
The driving converter comprises a positive half-cycle switching signal receiving end, a pulse control signal receiving end, a first driving signal, a second driving signal, a third driving signal and a fourth driving signal, wherein the positive half-cycle switching signal receiving end is connected with a third output end, the pulse control signal receiving end is connected with a fourth output end, and the first driving signal, the second driving signal, the third driving signal and the fourth driving signal are all connected with a three-level linear circuit and are used for controlling the three-level linear circuit.
2. The control circuit of a three-level in-line circuit of claim 1, wherein: the output voltage sampling circuit comprises a fourteenth resistor R14, a fifteenth resistor R15, a first resistor R1, a second resistor R2 and a first operational amplifier U1A, wherein one end of the fourteenth resistor R14 is connected with one end of the second resistor R2 and the negative input end of the first operational amplifier U1A, the other end of the second resistor R2 is connected with the output end of the first operational amplifier U1A, and the output end of the first operational amplifier U1A is a first output end;
one end of the fifteenth resistor R15 is connected with one end of the first resistor R1 and the positive electrode input end of the first operational amplifier U1A, and the other end of the first resistor R1 is grounded;
the other end of the fourteenth resistor R14 and the other end of the fifteenth resistor R15 are voltage sampling terminals.
3. A control circuit for a three-level in-line circuit as defined in claim 2, wherein: the system control circuit comprises a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a second operational amplifier U1B, wherein one end of the first capacitor C1 is connected with the negative input end of the second operational amplifier U1B, the other end of the first capacitor C1 is connected with one end of the third resistor R3, the other end of the third resistor R3 is a first signal receiving end and is connected with the output end of the first operational amplifier U1A, one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected with one end of the fifth resistor R5, one end of the second capacitor C2, one end of the third capacitor C3 and one end of the second operational amplifier U1B, the other end of the second capacitor C2 is connected with one end of the sixth resistor R6, the other end of the fifth resistor R5 is connected with the output end of the third resistor U1B, and the other end of the fourth resistor R6 is an operational amplifier;
The positive input end of the second operational amplifier U1B is a second signal receiving end and is used for accessing reference waves.
4. A control circuit for a three-level in-line circuit as defined in claim 3, wherein: the sine wave rectification conversion circuit comprises a seventh resistor R7, a ninth resistor R9, an eleventh resistor R11, a first diode D1 and a third operational amplifier U1C, wherein the negative input end of the third operational amplifier U1C is connected with one end of the eleventh resistor R11, one end of the seventh resistor R7 and one end of the ninth resistor R9, the other end of the seventh resistor R7 is a current sampling end, the other end of the ninth resistor R9 is a third signal receiving end and is connected between a control end and a fourth signal receiving end, the other end of the eleventh resistor R11 is connected with the cathode of the first diode D1, the anode of the first diode D1 is connected with the output end of the third operational amplifier U1C, and the cathode of the first diode D1 is a second output end and is connected with a fifth signal receiving end;
The positive input end of the third operational amplifier U1C is grounded.
5. A control circuit for a three-level in-line circuit as defined in claim 3, wherein: the positive and negative half cycle judging circuit comprises an eighth resistor R8, a tenth resistor R10, a twelfth resistor R12, a zener diode ZD1 and a fourth operational amplifier U2A, wherein the negative input end of the fourth operational amplifier U2A is a fourth signal receiving end and is connected with the ninth resistor R9 and the output end of the second operational amplifier U1B, the positive input end of the fourth operational amplifier U2A is connected with one end of the eighth resistor R8 and one end of the tenth resistor R10, the other end of the eighth resistor R8 is grounded, the other end of the tenth resistor R10 is connected with the output end of the fourth operational amplifier U2A and one end of the twelfth resistor R12, the other end of the twelfth resistor R12 is connected with the cathode of the zener diode ZD1, and the anode of the zener diode ZD1 is grounded;
the other end of the twelfth resistor R12 is a third output terminal.
6. The control circuit of a three-level in-line circuit of claim 4, wherein: the PWM wave generation circuit comprises a voltage comparator U3A and a thirteenth resistor R13, wherein the negative electrode input end of the voltage comparator U3A is a sixth signal receiving end and is used for being connected with a triangular carrier wave, the positive electrode input end of the voltage comparator U3A is a fifth signal receiving end and is connected with the cathode of a first diode D1, the output end of the voltage comparator U3A is a fourth output end and is connected with one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is connected with a power supply VCC.
7. A control method of a three-level in-line circuit, suitable for a control circuit of any one of claims 1 to 6, comprising:
Designing a control circuit of a three-level linear circuit to obtain a first control circuit;
obtaining a transfer function of a system control circuit according to the first control circuit;
simplifying and transforming based on the transfer function of the system control circuit to obtain controller parameters;
Simulating the controller parameters and the controlled object by using matlab according to the controller parameters;
According to the simulation result, the first control circuit is adjusted until the simulation result of the first control circuit is that the angular frequency is 20K, the system is kept stable, and the first control circuit is consistent with the control circuit of any three-level linear circuit to obtain a second control circuit;
Constructing a circuit according to the second control circuit and connecting the circuit with a three-level linear circuit;
a reference wave is input to the second signal receiving end, a triangular carrier is input to the sixth signal receiving end, and the control of the three-level linear circuit is realized; the reference wave is a sine wave formed by filtering pulses with equal amplitude and unequal widths by software according to sine wave chopping through a circuit.
8. The control method of the three-level in-line circuit according to claim 7, wherein: when the first control circuit is adjusted to a second control circuit, the calculating step of the controller parameter of the second control circuit includes:
Calculating equivalent impedance of each part of the system control circuit according to the circuit structure of the second control circuit and according to the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the first capacitor C1, the second capacitor C2 and the third capacitor C3;
Obtaining a transfer function of a system control circuit according to the equivalent impedance of each part;
simplifying and equivalent transfer functions of a system control circuit, and converting the transfer functions into zero-pole transfer functions;
And obtaining the controller parameters according to the equivalent impedance of each part and the transfer function of the zero pole point type.
9. The control method of a three-level in-line circuit according to claim 8, wherein: the transfer function of the zero pole point type is as follows: Wherein 、、、；
The controller parameter is。
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| CN102854373A (en) * | 2012-04-25 | 2013-01-02 | 中国科学院等离子体物理研究所 | PWM (Pulse-Width Modulation) three-level digital controller of zero-flux Hall large-current sensor |
| CN106160556A (en) * | 2016-07-04 | 2016-11-23 | 苏州迈力电器有限公司 | A kind of pure sine wave inverter with voltage stabilizing isolation features |
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| CN102854373A (en) * | 2012-04-25 | 2013-01-02 | 中国科学院等离子体物理研究所 | PWM (Pulse-Width Modulation) three-level digital controller of zero-flux Hall large-current sensor |
| CN106160556A (en) * | 2016-07-04 | 2016-11-23 | 苏州迈力电器有限公司 | A kind of pure sine wave inverter with voltage stabilizing isolation features |
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