CN205051620U - SPWM's over -modulation control system in electric machine control for electric motor car - Google Patents
SPWM's over -modulation control system in electric machine control for electric motor car Download PDFInfo
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- CN205051620U CN205051620U CN201520861309.XU CN201520861309U CN205051620U CN 205051620 U CN205051620 U CN 205051620U CN 201520861309 U CN201520861309 U CN 201520861309U CN 205051620 U CN205051620 U CN 205051620U
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Abstract
The utility model relates to a SPWM's over -modulation control system in electric machine control for electric motor car, it includes sine table initialization unit, current sampling unit, crosses modulation factor the control unit, comparison the control unit, sampling point the control unit, sine table renewal unit, moves looks the control unit and pulse output and the control unit, sine table initialization unit one end junction current sampling unit, cross modulation factor the control unit one end and connect relatively the control unit, sine table renewal unit is connected conglomerate, mistake modulation factor the control unit and the comparison the control unit's of sine table initialization unit and current sampling unit conglomerate and carrier wave respectively and is connected than calculating unit, sampling point the control unit connect respectively the carrier wave than calculating unit with move looks the control unit, pulse output is connected respectively with the control unit and moves looks the control unit and duty cycle calculating unit. The utility model discloses improvement DC voltage utilization ratio that can be very big, the over -modulation district can follow load torque's change and change, and is efficient.
Description
Technical field
The utility model relates to the control technology field of AC induction motor, particularly relates to the ovennodulation control system of SPWM in the control of a kind of motor of electric motor car.
Background technology
AC induction motor is when adopting SPWM control technology, and the theoretic maximum of its direct voltage utilance is 0.866, and square being directly proportional of the torque of motor and stator voltage, this numerical value affects the external characteristic of motor, particularly peak torque greatly.
Concerning high-performance AC drive system, making full use of direct voltage, is obtain the very important factor of of maximum output electromagnetic torque, especially in the weak-magnetic speed-regulating stage.When two level PWM voltage source inverters adopt traditional SPWM to control, output voltage can only reach 78.54% (linear work district) of square wave operating mode.In order to obtain larger output voltage, inverter must operate at overmodulation, until reach square wave operating mode.After entering overmodulation, to Severe distortion be there is in output voltage, affect motor output torque, therefore special control method is needed, ensure while the raising index of modulation, make motor have good control characteristic in whole service process, realize the linearisation of control law and the minimizing of torque pulsation.
Above-mentioned known, be necessary to do perfect further to prior art.
Summary of the invention
For above problem, the utility model proposes a kind of simple and reasonable for structure, stable and reliable operation, direct voltage utilance can greatly be improved, overmodulation can be followed the change of load torque and change, efficiency is high, and most service areas harmonic content is little, can meet the ovennodulation control system of SPWM in the motor of electric motor car control of the technical requirement of Electric Machine Control SPWM.
The utility model is achieved through the following technical solutions:
The ovennodulation control system of SPWM during above-mentioned motor of electric motor car controls, it comprises sine table initialization unit, current sampling unit, ovennodulation degree control unit, compares control unit, sampled point control unit, sine table updating block, phase shifting control unit, pulse output and control unit, duty ratio computing unit and carrier wave ratio computing unit; Described sine table initialization unit is connected with current sampling unit, and becomes one, and forms described sine table initialization unit and current sampling unit conglomerate; Described current sampling unit comprises current detecting hardware handles circuit; Described current detecting hardware handles circuit is connected to form by chip A1, Transient Suppression Diode TVS2 and TVS3, electric capacity C10 ~ C20, resistance R18 ~ R28, chip U4, operational amplifier Q4 and Q5; Described ovennodulation degree control unit with compare control unit and be connected, and to become one, form described ovennodulation degree control unit and compare control unit conglomerate; Described sine table initialization unit is connected described ovennodulation degree control unit and compares control unit conglomerate with current sampling unit conglomerate; Described sine table updating block connects described sine table initialization unit and current sampling unit conglomerate, described ovennodulation degree control unit respectively and compares control unit conglomerate and described carrier wave ratio computing unit; Described sampled point control unit connects described carrier wave ratio computing unit and described phase shifting control unit respectively; Described phase shifting control unit one end is connected to described duty ratio computing unit; Described duty ratio computing unit one end connects described pulse output and control unit.
The ovennodulation control system of SPWM during described motor of electric motor car controls, wherein: the described control unit that compares is for generation of pulse.
The ovennodulation control system of SPWM during described motor of electric motor car controls, wherein: the carrier wave ratio of described carrier wave ratio computing unit when asynchronous modulation is the integral multiple of 6.
The ovennodulation control system of SPWM during described motor of electric motor car controls, wherein: No. 1 pin of described chip A1 connects+5V power supply, No. 2 pin ground connection; The anode tap ground connection of described Transient Suppression Diode TVS2, cathode terminal connects No. 3 pins of described chip A1; Described electric capacity C10 one end ground connection, the other end connects+5V power supply; Described electric capacity C11 one end connects No. 3 pins of described chip A1, other end ground connection; Described electric capacity C12 one end connects No. 3 pins of described chip A1, and the other end is connected described resistance R20 and is connected to the pin IN1 of described chip U3 by described resistance R20; Described resistance R18 one end ground connection, the other end is connected to No. 3 pins of described chip A1 and the tie point of described electric capacity C12; Described resistance R19 one end ground connection, the other end is connected to the tie point of described electric capacity C12 and resistance R20; Described chip U4, by pin IN2 ground connection, connects+5V power supply by pin V+; Described electric capacity C13 one end connects+5V power supply, other end ground connection; Described electric capacity C14 is polar capacitor, and its positive terminal connects the pin Vout of described chip U3, and negative pole end connects pin OUTRIN, pin EN and the pin GND of described chip U3 respectively; Described resistance R21 one end connects the pin Vout of described chip U3, and the other end is connected described resistance R23 and connected the in-phase input end of described operational amplifier Q4 by described resistance R23; Described electric capacity C15 one end connects the tie point of described resistance R21 and resistance R23, other end ground connection; Described resistance R22 one end connects the tie point of described resistance R21 and resistance R23, other end ground connection; The positive terminal of described operational amplifier Q4 connects+5V power supply, negative pole end ground connection, and inverting input connects described resistance R24 and by described resistance R24 ground connection; Between the in-phase input end that described electric capacity C16 one end is connected to described operational amplifier Q4 and inverting input; Between the inverting input that described resistance R25 is connected to described operational amplifier Q4 and output; Described electric capacity C17 is parallel to described resistance R25 two ends; Described electric capacity C18 one end is connected to the output of described operational amplifier Q4, other end ground connection; Described resistance R26 is parallel to described electric capacity C18 two ends; Described resistance R27 one end is connected to the output of described operational amplifier Q4, and the other end is connected to the in-phase input end of described operational amplifier Q5; The inverting input of described operational amplifier Q4 is connected with output; Described resistance R28 one end connects the output of described operational amplifier Q4, and the other end is connected with terminal ADCIN5; Described electric capacity C19 one end connects described terminal ADCIN5, other end ground connection; The anode tap ground connection of described Transient Suppression Diode TVS3, cathode terminal connects described terminal ADCIN5; Described electric capacity C20 one end connects+5V power supply, other end ground connection.
Beneficial effect:
During the utility model motor of electric motor car controls, the ovennodulation Control system architecture of SPWM is simple, reasonable, stable and reliable operation, on traditional modulator approach basis, adopt the control algolithm improved, can greatly improve direct voltage utilance, this numerical value synchronously can change according to the change of load torque simultaneously; Electric Machine Control SPWM ovennodulation control system is high to direct voltage utilance, and overmodulation can be followed the change of load torque and change, and efficiency is high, and most service areas harmonic content is little, can meet the technical requirement of Electric Machine Control SPWM.
Accompanying drawing explanation
Fig. 1 is the structural representation of the ovennodulation control system of SPWM during the utility model motor of electric motor car controls;
Fig. 2 is the current detecting hardware handles circuit diagram of the current sampling unit of the ovennodulation control system of SPWM during the utility model motor of electric motor car controls;
Fig. 3 is the circuit theory diagrams that three half-bridges of the phase shifting control unit of the ovennodulation control system of SPWM during the utility model motor of electric motor car controls are corresponding.
Embodiment
As shown in Figures 1 to 3, during the utility model motor of electric motor car controls, the ovennodulation control system of SPWM, comprises sine table initialization unit 1, current sampling unit 2, ovennodulation degree control unit 3, compares control unit 4, sine table updating block 5, carrier wave ratio computing unit 6, sampled point control unit 7, phase shifting control unit 8, duty ratio computing unit 9 and pulse output and control unit 10.
Wherein, this sine table initialization unit 1 and current sampling unit 2 become one, this ovennodulation degree control unit 3 and compare control unit 4 and also become one.
This sine table initialization unit 1 is that (according to the rotating speed range of operation of motor, its whole frequency is divided into multistage, and the carrier wave ratio of each section sets in advance for carrier wave ratio according to synchronous modulation.) size calculate sine table, obtain at sine value corresponding to different sampled point; Wherein, this sine table initialization unit 1 one end is connected to current sampling unit 2.
This current sampling unit 2 is the electric currents calculating two-phase stator winding in real time, and is formed in the ammeter under different torque and rotational speed; Wherein, as shown in Figure 2, this current sampling unit 2 comprises current detecting hardware handles circuit, and this current detecting hardware handles circuit is connected to form by chip A1, Transient Suppression Diode TVS2 and TVS3, electric capacity C10 ~ C20, resistance R18 ~ R28, chip U4, operational amplifier Q4 and Q5; Wherein, No. 1 pin of this chip A1 connects+5V power supply, No. 2 pin ground connection; The anode tap ground connection of this Transient Suppression Diode TVS2, cathode terminal connects No. 3 pins of chip A1; This electric capacity C10 one end ground connection, the other end connects+5V power supply; This electric capacity C11 one end connects No. 3 pins of chip A1, other end ground connection; This electric capacity C12 one end connects No. 3 pins of chip A1, and other end contact resistance R20 is also connected to the pin IN1 of chip U3 by resistance R20; This resistance R18 one end ground connection, the other end is connected to No. 3 pins of chip A1 and the tie point of electric capacity C12; This resistance R19 one end ground connection, the other end is connected to the tie point of electric capacity C12 and resistance R20; This chip U4, by pin IN2 ground connection, connects+5V power supply by pin V+; Electric capacity C13 one end connects+5V power supply, other end ground connection; This electric capacity C14 is polar capacitor, and its positive terminal connects the pin Vout of chip U3, and negative pole end connects pin OUTRIN, pin EN and the pin GND of chip U3 respectively; Resistance R21 one end connects the pin Vout of chip U3, and other end contact resistance R23 is also by the in-phase input end of resistance R23 concatenation operation amplifier Q4; The tie point of electric capacity C15 one end contact resistance R21 and resistance R23, other end ground connection; The tie point of resistance R22 one end contact resistance R21 and resistance R23, other end ground connection; The positive terminal of this operational amplifier Q4 connects+5V power supply, negative pole end ground connection, and inverting input contact resistance R24 also passes through resistance R24 ground connection; Between the in-phase input end that this electric capacity C16 one end is connected to operational amplifier Q4 and inverting input; Between the inverting input that this resistance R25 is connected to operational amplifier Q4 and output; This electric capacity C17 is parallel to resistance R25 two ends; Electric capacity C18 one end is connected to the output of operational amplifier Q4, other end ground connection; This resistance R26 is parallel to this electric capacity C18 two ends; This resistance R27 one end is connected to the output of operational amplifier Q4, and the other end is connected to the in-phase input end of operational amplifier Q5; The inverting input of this operational amplifier Q4 is connected with output; The output of this resistance R28 one end concatenation operation amplifier Q4, the other end is connected with terminal ADCIN5; This electric capacity C19 one end splicing ear ADCIN5, other end ground connection; The anode tap ground connection of this Transient Suppression Diode TVS3, cathode terminal splicing ear ADCIN5; Electric capacity C20 one end connects+5V power supply, other end ground connection.
This ovennodulation degree control unit 3 is the data gathered according to current sampling unit 2, and in conjunction with the rotor speed of current motor and stator voltage, determines ovennodulation coefficient; Wherein, conglomerate one end of this sine table initialization unit 1 and current sampling unit 2 is connected to ovennodulation degree control unit 3 and compares the conglomerate of control unit 4; This ovennodulation degree control unit 3 one end is connected to compares control unit 4.
This compares control unit 4 is produce pulse according to the ovennodulation coefficient determination modulation signal of ovennodulation degree control unit 3 with comparing of carrier signal.
This sine table updating block 5 upgrades sine table according to the size of the stator voltage frequency of governing system and modulation degree (calculating and the sine value of the numerical value of comparand register are relevant, after sine table upgrades, calculate the numerical value of new comparand register), thus upgrade the numerical value of comparand register; Wherein, this sine table updating block 5 one end is connected to the conglomerate of this sine table initialization unit 1 and current sampling unit 2, and the other end is connected to ovennodulation degree control unit 3 and compares the conglomerate of control unit 4, is also connected with carrier wave ratio computing unit 6 simultaneously.
Carrier wave ratio when carrier wave ratio when this carrier wave ratio computing unit 6 is calculating asynchronous modulations and synchronous modulation, wherein, in order to harmonic reduction and slow down the asymmetric of waveform, when asynchronous modulation, to ensure that carrier wave ratio be the integral multiple of 6 while considering frequency transitions smooth as far as possible, adopt the method for tabling look-up to calculate the carrier wave ratio under different operating mode; Calculate carrier wave ratio during synchronous modulation, according to the rotating speed range of operation of motor, its whole frequency is divided into multistage, and the carrier wave ratio of each section sets in advance.This carrier wave ratio computing unit 6 one end connects sampled point control unit 7.
This sampled point control unit 7 is that the carrier wave ratio obtained according to carrier wave ratio computing unit 6 (is divided into two kinds of situations, one is the carrier wave ratio of asynchronous modulation, calculate carrier wave ratio during asynchronous modulation, in order to harmonic reduction and slow down the asymmetric of waveform, when asynchronous modulation, to ensure that carrier wave ratio be the integral multiple of 6 while considering frequency transitions smooth as far as possible, adopt the method for tabling look-up to calculate the carrier wave ratio under different operating mode; Two is carrier wave ratios of synchronous modulation, and according to the rotating speed range of operation of motor, its whole frequency is divided into multistage, and the carrier wave ratio of each section sets in advance.) size, from sampled point 0 moment in disconnected in the cycle, continuous print changes to maximum, to reach after maximum again from zero moment, repeats said process; Wherein, this sampled point control unit 7 one end is connected to phase shifting control unit 8.
This phase shifting control unit 8 is that according to the carrier wave ratio of different frequency range, (according to the rotating speed range of operation of motor, its whole frequency is divided into multistage, and the carrier wave ratio of each section sets in advance in synchronous modulation.), calculate the sampled point that the initial phase of 3 half-bridges in three-phase inverter is corresponding; Wherein, this phase shifting control unit 8 one end is connected to duty ratio computing unit 9.
This duty ratio computing unit 9 is the duty ratios calculating six current pulses according to current carrier signal, modulation wave signal and modulation degree, direct voltage utilance and reduce the occupancy of controller memory space during in order to be increased in low cruise, this unit will calculate in real time; Wherein, this duty ratio computing unit 9 one end connects pulse output and control unit 10.
This pulse output and control unit 10 are the output calculated according to duty ratio computing unit 9 and carrier wave ratio computing unit 6, carry out the equivalent width and the frequency that upgrade pulse in timed interrupt cycle.
Use principle of the present utility model:
After control system powers on, system initialization, offset of sinusoidal table carries out initialization, according to the electric current that current sampling unit 2 is sampled, voltage and rotor speed, judge whether to carry out ovennodulation, if do not carry out ovennodulation, so just carry out following operating process, if now carrying out voltage and frequency adjustment, so just upgrade sine table, when Interruption arrives, judge whether to upgrade sine table, if upgrade sine table to upgrade with regard to offset of sinusoidal table again, if do not upgrade sine table, now by sampled point control unit 7 calculating sampling point, the phase sequence of three phase full bridge six pulses is calculated by phase shifting control unit 8, the phase sequence determined according to said two units and sampled point calculate the numerical value of comparand register by the method for tabling look-up, pulse output and control unit 10 export PWM waveform according to the parameter calculating PWM, after exporting PWM waveform, system gets back to whether upgrade sine table place, repeat said process.If now carry out ovennodulation, by the calculated index of modulation of ovennodulation degree control unit 3, according to the ovennodulation coefficient calculated, the pulse duration of calculated modulator zone, upgrades sine table after calculating the pulse duration of overmodulation, repeats said process.
The utility model is simple and reasonable for structure, stable and reliable operation, can greatly improve direct voltage utilance, overmodulation can be followed the change of load torque and change, efficiency is high, and most service areas harmonic content is little, can meet the technical requirement of Electric Machine Control SPWM.
Claims (4)
1. motor of electric motor car control in an ovennodulation control system of SPWM, it is characterized in that: described ovennodulation control system comprises sine table initialization unit, current sampling unit, ovennodulation degree control unit, compares control unit, sampled point control unit, sine table updating block, phase shifting control unit, pulse output and control unit, duty ratio computing unit and carrier wave ratio computing unit;
Described sine table initialization unit is connected with current sampling unit, and becomes one, and forms described sine table initialization unit and current sampling unit conglomerate; Described current sampling unit comprises current detecting hardware handles circuit; Described current detecting hardware handles circuit is connected to form by chip A1, Transient Suppression Diode TVS2 and TVS3, electric capacity C10 ~ C20, resistance R18 ~ R28, chip U4, operational amplifier Q4 and Q5;
Described ovennodulation degree control unit with compare control unit and be connected, and to become one, form described ovennodulation degree control unit and compare control unit conglomerate;
Described sine table initialization unit is connected described ovennodulation degree control unit and compares control unit conglomerate with current sampling unit conglomerate;
Described sine table updating block connects described sine table initialization unit and current sampling unit conglomerate, described ovennodulation degree control unit respectively and compares control unit conglomerate and described carrier wave ratio computing unit;
Described sampled point control unit connects described carrier wave ratio computing unit and described phase shifting control unit respectively;
Described phase shifting control unit one end is connected to described duty ratio computing unit;
Described duty ratio computing unit one end connects described pulse output and control unit.
2. motor of electric motor car as claimed in claim 1 control in the ovennodulation control system of SPWM, it is characterized in that: the described control unit that compares is for generation of pulse.
3. motor of electric motor car as claimed in claim 1 control in the ovennodulation control system of SPWM, it is characterized in that: the carrier wave ratio of described carrier wave ratio computing unit when asynchronous modulation is the integral multiple of 6.
4. motor of electric motor car as claimed in claim 1 control in the ovennodulation control system of SPWM, it is characterized in that: No. 1 pin of described chip A1 connects+5V power supply, No. 2 pin ground connection; The anode tap ground connection of described Transient Suppression Diode TVS2, cathode terminal connects No. 3 pins of described chip A1; Described electric capacity C10 one end ground connection, the other end connects+5V power supply; Described electric capacity C11 one end connects No. 3 pins of described chip A1, other end ground connection; Described electric capacity C12 one end connects No. 3 pins of described chip A1, and the other end is connected described resistance R20 and is connected to the pin IN1 of described chip U3 by described resistance R20; Described resistance R18 one end ground connection, the other end is connected to No. 3 pins of described chip A1 and the tie point of described electric capacity C12; Described resistance R19 one end ground connection, the other end is connected to the tie point of described electric capacity C12 and resistance R20; Described chip U4, by pin IN2 ground connection, connects+5V power supply by pin V+; Described electric capacity C13 one end connects+5V power supply, other end ground connection; Described electric capacity C14 is polar capacitor, and its positive terminal connects the pin Vout of described chip U3, and negative pole end connects pin OUTRIN, pin EN and the pin GND of described chip U3 respectively; Described resistance R21 one end connects the pin Vout of described chip U3, and the other end is connected described resistance R23 and connected the in-phase input end of described operational amplifier Q4 by described resistance R23; Described electric capacity C15 one end connects the tie point of described resistance R21 and resistance R23, other end ground connection; Described resistance R22 one end connects the tie point of described resistance R21 and resistance R23, other end ground connection; The positive terminal of described operational amplifier Q4 connects+5V power supply, negative pole end ground connection, and inverting input connects described resistance R24 and by described resistance R24 ground connection; Between the in-phase input end that described electric capacity C16 one end is connected to described operational amplifier Q4 and inverting input; Between the inverting input that described resistance R25 is connected to described operational amplifier Q4 and output; Described electric capacity C17 is parallel to described resistance R25 two ends; Described electric capacity C18 one end is connected to the output of described operational amplifier Q4, other end ground connection; Described resistance R26 is parallel to described electric capacity C18 two ends; Described resistance R27 one end is connected to the output of described operational amplifier Q4, and the other end is connected to the in-phase input end of described operational amplifier Q5; The inverting input of described operational amplifier Q4 is connected with output; Described resistance R28 one end connects the output of described operational amplifier Q4, and the other end is connected with terminal ADCIN5; Described electric capacity C19 one end connects described terminal ADCIN5, other end ground connection; The anode tap ground connection of described Transient Suppression Diode TVS3, cathode terminal connects described terminal ADCIN5; Described electric capacity C20 one end connects+5V power supply, other end ground connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520861309.XU CN205051620U (en) | 2015-11-02 | 2015-11-02 | SPWM's over -modulation control system in electric machine control for electric motor car |
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| CN201520861309.XU CN205051620U (en) | 2015-11-02 | 2015-11-02 | SPWM's over -modulation control system in electric machine control for electric motor car |
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| CN201520861309.XU Expired - Fee Related CN205051620U (en) | 2015-11-02 | 2015-11-02 | SPWM's over -modulation control system in electric machine control for electric motor car |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113098355A (en) * | 2021-04-29 | 2021-07-09 | 臻驱科技（上海）有限公司 | Over-modulation method and system of motor controller |
| CN116338439A (en) * | 2023-05-29 | 2023-06-27 | 成都瑞迪威科技有限公司 | Chip initialization data testing method through phase shift control |
-
2015
- 2015-11-02 CN CN201520861309.XU patent/CN205051620U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113098355A (en) * | 2021-04-29 | 2021-07-09 | 臻驱科技（上海）有限公司 | Over-modulation method and system of motor controller |
| CN116338439A (en) * | 2023-05-29 | 2023-06-27 | 成都瑞迪威科技有限公司 | Chip initialization data testing method through phase shift control |
| CN116338439B (en) * | 2023-05-29 | 2023-08-04 | 成都瑞迪威科技有限公司 | Chip initialization data testing method through phase shift control |
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Effective date of registration: 20160620 Address after: 100055, room two, room 1, building 201, Beijing office, South Plaza, Fengtai District west station, Beijing Patentee after: SHANGTANG INVESTMENT CO., LTD. Address before: Shiyan City, Hubei province 442002 City Road No. 167 Patentee before: Hubei University of Automobile Technology |
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Granted publication date: 20160224 Termination date: 20181102 |