CN100544188C - A kind of pulse width modulation frequency changing driving system for economical AC motor - Google Patents

A kind of pulse width modulation frequency changing driving system for economical AC motor Download PDF

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CN100544188C
CN100544188C CNB2005100370508A CN200510037050A CN100544188C CN 100544188 C CN100544188 C CN 100544188C CN B2005100370508 A CNB2005100370508 A CN B2005100370508A CN 200510037050 A CN200510037050 A CN 200510037050A CN 100544188 C CN100544188 C CN 100544188C
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brachium pontis
mutually
phase
mouth
xor gate
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CN1925313A (en
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黄险峰
朱健昭
区长钊
卓春光
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JIANGMEN CITY WASHING MACHINE FACTORY
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JIANGMEN CITY WASHING MACHINE FACTORY
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Abstract

A kind of pulse width modulation frequency changing driving system for economical AC motor, the 1st mutually upper and lower brachium pontis switch element and the 2nd mutually upper and lower brachium pontis switch element that is connected in series are connected in series between the DC power supply positive and negative electrode; The threephase motor terminal is access to DC power supply common port and described series connection point; Also comprise single-chip microcomputer and the 1st, 2 mutually upper and lower brachium pontis control XOR gate.The 1st, 2 mutually upper and lower brachium pontis modulation signal mouths of single-chip microcomputer are access to one input of identical brachium pontis control XOR gate, and the 1st, 2 phase gating mouths are access to another input of homophase XOR gate; Each XOR gate output is access to identical brachium pontis switch element control end; The upper and lower brachium pontis modulation signal of homophase mouth is exported a phase double polarity sine ripple pulse-width signal, and the 1st, 2 phase signals phase difference of pi/3; Each gating mouth is output as each space voltage vector pulse-width modulation of brachium pontis switch element state mutually of control with modulation signal mouth state through each XOR gate, reaches the SVPWM that uses the special-purpose singlechip control chip of existing SPWM mode to realize 4 switch elements.

Description

A kind of pulse width modulation frequency changing driving system for economical AC motor
Technical field
The present invention relates to a kind of pulse width modulation frequency changing driving system for economical AC motor, in International Patent Classification (IPC), functional classification can belong to H02P7/00.
Background technology
Typical alternating current motor frequency changing driving system is that the three-phase bridge 6 unit inverter circuits of DC power supply are controlled in the sinusoidal pulse width modulation mode, converts the symmetrical threephase source of frequency conversion to, drives three-phase alternating-current motor.The existing at present ripe design of such system comprises special-purpose singlechip control chip and chip for driving that each device production merchant provides in a large number.Thereby the exemplary program that as far as possible adopts these chips and device production merchant to recommend when system design can significantly reduce the design work amount and more help the performance of the system that guarantees.
For saving cost, the applicant has proposed to be applicable to the economical AC motor frequency changing driving system of the electronic system of family expenses small-power, is found in Chinese invention patent specification CN1184735C " washing machine of frequency conversion drive " and CN1164824C " washing machine of frequency conversion three-phase drive ".Its change with respect to the alternating current motor frequency changing driving system of aforementioned typical mainly is to replace three-phase bridge 6 unit inverter circuits with two-phase bridge-type 4 unit inverter circuits, drives two-phase or threephase motor, thereby has saved 2 element circuits.
In addition, magnetic flux sinusoidal pulse width modulation (SVPWM) mode (claiming the space voltage vector PWM method again) that prior art is released in recent years, with respect to the most widely used voltage, current sinusoidal pulse-width modulation (SPWM) mode at present, can make System Model Reduction, being convenient to microprocessor handles in real time, can reduce the straight-through failure rate of torque pulsation, noise, switching loss and bridge circuit, the supply voltage utilance can improve 15%; When being used for two-phase bridge-type 4 unit inverter circuits driving threephase motors, also can improve the waveform and the symmetry of line voltage.
But, present special-purpose singlechip control chip and chip for driving mainly are the SPWM modes, especially as yet be not useful on the special-purpose singlechip control chip and the chip for driving of the SVPWM mode of two-phase bridge-type 4 unit inverter circuits, thereby influenced SVPWM mode applying at the economical AC motor frequency changing driving system.
The understanding that relates to relational term of the present invention and design is found in following data:
[1] Li Huade, AC speed regulating control system Beijing such as Bai Jing: Electronic Industry Press, 2003
[2] Li Yongdong alternating current machine numerical control system Beijing: China Machine Press, 2002
[3] experimental study in June, 2005 Tsing-Hua University's Master's thesis of the economical variable-frequency washing machine frequency-changing control system of Feng Guoqiang
[4] drive plate of a kind of variable-frequency washing machine of Zhang Jianming research in June, 2004 Tsing-Hua University's Master's thesis
[5] variable-frequency washing machine in December, 2003 Tsing-Hua University's Master's thesis of Zeng Lingyuan two-phase power drives two-phase asynchronous motor
[6]Blaabjerg?F,Freysson?S.A?new?optimized?space?vector?modulation?strategy?for?acomponent?minimized?voltage?source?inverter.IEEE?Trans?onPe,1997,12(2):705~714
[7]Peters?G?L,Covic?G?A.Elimination?output?distortion?in?four?switch?inverters?withthree-phase.IEE?Proc-electro?Power.1998,145(2):326~332
Summary of the invention
Technical problem to be solved by this invention is, proposes a kind of pulse width modulation frequency changing driving system for economical AC motor, and it uses the special-purpose singlechip control chip of two-phase bridge-type 4 unit inverter circuits and existing SPWM mode, but can realize SVPWM.
A technical scheme of technical solution problem of the present invention is, a kind of pulse width modulation frequency changing driving system for economical AC motor comprises by DC power supply and is controlled by the inverter circuit of controlling organization and the alternating current motor of driving thereof;
---described DC power supply is exported a positive pole, a negative pole and a zero potential common port;
---described inverter circuit is the two-phase bridge-type, and being included in is connected in series between positive supply bus and the negative supply bus the 1st goes up brachium pontis switch element and following brachium pontis switch element mutually, and is connected in series and the 2nd goes up brachium pontis switch element and following brachium pontis switch element mutually; Positive supply bus, negative supply bus are access to described dc power anode, negative pole respectively;
---described motor is a threephase motor, and its three-phase terminal is access to described DC power supply common port, the 1st respectively and goes up the series connection point that brachium pontis switch element and the series connection point, the 2nd of following brachium pontis switch element are gone up brachium pontis switch element and following brachium pontis switch element mutually mutually;
---described controlling organization is to the control end output modulation signal of described each phase brachium pontis switch element;
---described controlling organization comprises a single-chip microcomputer, and it comprises 6 switching value delivery outlets: the 1st goes up brachium pontis modulation signal mouth, the 1st mutually descends brachium pontis modulation signal mouth, the 2nd to go up brachium pontis modulation signal mouth, the 2nd mutually to descend brachium pontis modulation signal mouth, the 1st phase gating mouth, the 2nd phase gating mouth mutually mutually;
---described controlling organization comprises 4 XOR gate: the 1st goes up brachium pontis control XOR gate, the 1st mutually descend brachium pontis control XOR gate, the 2nd to go up brachium pontis mutually to control XOR gate and the 2nd and descend brachium pontis to control XOR gate mutually mutually; Described each modulation signal mouth is access to an input with identical brachium pontis control XOR gate respectively, and the output of each gating mouth is access to another input of homophase XOR gate respectively, and the output of each XOR gate is access to the control end of inverter circuit with identical brachium pontis switch element;
---the output characteristic of described 4 the modulation signal mouths of described Single-chip Controlling is: the output complementation of the output of brachium pontis modulation signal mouth and following brachium pontis modulation signal mouth on the homophase, export a phase double polarity sine ripple pulse-width signal according to the sinusoidal bipolarity modulation method of voltage, and the 1st modulates sinusoidal reference signal and the 2nd mutually to modulate the phase difference of sinusoidal reference signal mutually is π/3;
---described each the gating mouth of described Single-chip Controlling is output as each the space voltage vector pulse-width modulation (SVPWM) of brachium pontis switch element on off state mutually of the described inverter circuit of control with the state of modulation signal mouth through each XOR gate.
Another technical scheme of technical solution problem of the present invention is, a kind of pulse width modulation frequency changing driving system for economical AC motor comprises by DC power supply and is controlled by the inverter circuit of controlling organization and the alternating current motor of driving thereof;
---described DC power supply is exported a positive pole, a negative pole and a zero potential common port;
---described inverter circuit is the two-phase bridge-type, and being included in is connected in series between positive supply bus and the negative supply bus the 1st goes up brachium pontis switch element and following brachium pontis switch element mutually, and is connected in series and the 2nd goes up brachium pontis switch element and following brachium pontis switch element mutually; Positive supply bus, negative supply bus are access to described dc power anode, negative pole respectively;
---described motor is symmetrical two-phase motor, the common port of its two-phase winding is access to described DC power supply common port, and the other end of each phase winding is access to the 1st respectively and goes up the series connection point that brachium pontis switch element and the series connection point, the 2nd of following brachium pontis switch element are gone up brachium pontis switch element and following brachium pontis switch element mutually mutually;
---controlling organization, to the control end output modulation signal of described each phase brachium pontis switch element;
---described controlling organization comprises a single-chip microcomputer, and it comprises 6 switching value delivery outlets: the 1st goes up brachium pontis modulation signal mouth, the 1st mutually descends brachium pontis modulation signal mouth, the 2nd to go up brachium pontis modulation signal mouth, the 2nd mutually to descend brachium pontis modulation signal mouth, the 1st phase gating mouth, the 2nd phase gating mouth mutually mutually;
---described controlling organization comprises 4 XOR gate: the 1st goes up brachium pontis control XOR gate, the 1st mutually descend brachium pontis control XOR gate, the 2nd to go up brachium pontis mutually to control XOR gate and the 2nd and descend brachium pontis to control XOR gate mutually mutually; Described each modulation signal mouth is access to an input with identical brachium pontis control XOR gate respectively, and the output of each gating mouth is access to another input of homophase XOR gate respectively, and the output of each XOR gate is access to the control end of inverter circuit with identical brachium pontis switch element;
---the output characteristic of described 4 the modulation signal mouths of described Single-chip Controlling is: the output complementation of the output of brachium pontis modulation signal mouth and following brachium pontis modulation signal mouth on the homophase, export a phase double polarity sine ripple pulse-width signal according to the sinusoidal bipolarity modulation method of voltage, and the 1st modulates sinusoidal reference signal and the 2nd mutually to modulate the phase difference of sinusoidal reference signal mutually is pi/2;
---described each the gating mouth of described Single-chip Controlling is output as each the space voltage vector pulse-width modulation (SVPWM) of brachium pontis switch element on off state mutually of the described inverter circuit of control with the state of modulation signal mouth through each XOR gate.
Above scheme is accepted or rejected the two-phase double polarity sine ripple pulse-width signal that phase difference changes π/3 (when driving threephase motor) or pi/2 (when driving two-phase motor) into through XOR gate the ingenious gating mouth that established procedure control is set of the special-purpose singlechip control chip of existing SPWM mode, and the result obtains 4 on off state space voltage vector pulse-width modulation (SVPWM) signals.
The control that above scheme further designs single-chip microcomputer comprises an interrupt routine, and this interrupt routine comprises the steps:
---check described on off state and gating mouth state is set by this state;
---the voltage vector instruction to described space voltage vector pulse-width modulation changes the regulation electrical degree;
---by interval of living in after the described voltage vector change regulation electrical degree on off state and modulation signal mouth state are set.
Technical solution of the present invention and effect will be further described in embodiment in conjunction with the accompanying drawings.
Description of drawings
Fig. 1 is the electric diagram of a kind of frequency conversion drive system of pulse width modulation in AC motor of prior art;
Fig. 2 is frequency conversion drive system of pulse width modulation in AC motor modulation signal waveform figure shown in Figure 1;
Fig. 3 is a frequency conversion drive system of pulse width modulation in AC motor main program flow chart shown in Figure 1;
Fig. 4 is a frequency conversion drive system of pulse width modulation in AC motor interrupt routine flow chart shown in Figure 1;
Fig. 5 is the present invention's the 1st embodiment electric diagram;
Fig. 6 is the present invention's the 1st embodiment interrupt routine flow chart;
Fig. 7 is that the present invention's the 1st embodiment interrupt routine is provided with gating mouth flow chart;
Fig. 8 is that the present invention's the 1st embodiment interrupt routine is provided with modulation signal mouth flow chart;
Fig. 9 is the subroutine flow chart that the present invention's the 1st embodiment interrupt routine calls;
Figure 10 is the present invention's the 1st embodiment XOR gate input and output oscillogram.
Embodiment
Embodiment of the invention frequency conversion drive system of pulse width modulation in AC motor is to transform to form on the basis of a kind of frequency conversion drive system of pulse width modulation in AC motor of prior art.
This system electrical of prior art figure as shown in Figure 1, the interchange of bridge rectifier BRD201 (AC) input 2 and 3 is connected the neutral line N and the phase line L of the single phase alternating current power supply of 220V (AC50HZ) respectively, direct current (DC) output 1 is connected the filter circuit of being made up of capacitor 225 with 4, output dc bus VDD is the about 300V of voltage of bus over the ground.The A that inverter circuit is made up of insulated gate bipolar transistor IGBT 201 and IGBT202 is bridge mutually, and the B that IGBT203 and IGBT204 form is bridge mutually, and the C phase spanning that IGBT205 and IGBT206 form is connected between dc bus VDD and the ground bus.Three-phase terminal A-phase, the B-phase of three-phase alternating-current motor (MOTOR) M201 and C-phase are access to inverter circuit homophase bridge mid point respectively.It is ST7FMC1K276 that single-chip microcomputer U201 selects model for use, be special-purpose variable frequency control chip, its inside is except that comprising common single chip computer architecture U201.1 such as CPU and I/O mouth, the SPWM waveform generator U201.2 that also has a three-phase complementation, the three-phase SPWM modulation signal switching value delivery outlet of 6 special uses of being disposed: 30 (definition MCO0.HS), 31 (definition MCO1.HS), 32 (definition MCO2.HS), 1 (definition MCO3.HS), 2 (definition MCO4.HS) and 3 (definition MCO5.HS) number pin are respectively through chip for driving U202, U203, U204, U205, (select model for use: (H0) exported in input IR2125) (IN) for U206 and U207, current-limiting resistance R207, R208, R252, R253, R209 and R210 are access to the G utmost point of each IGBT.Single-chip microcomputer U201 requires also to write a plurality of interrupt routines that comprise functions such as protection of manufacturer recommendation the self-editing main program according to machine specific tasks speed regulating control except that writing as Fig. 3, especially produces the interrupt routine of SPWM waveform as Fig. 4.
Main program as shown in Figure 3, at first carry out the conventional initialization of reading in file, definition and each variable (as step 001 and 002), begin to take place the interrupt routine (as step 003) of SPWM waveform then, and repeatedly communicate by letter (as step 004) with host computer, motor operational mode state (code name state) word that acquisition is determined according to the machine specific tasks, and according to this status word operating motor operational mode 1 or 2 or 3 (as step 005), comprising the setting that changes frequency (using variable MTCstatute).
Interrupt routine uses variable Y to be used to calculate modulation reference sinusoidal signal electrical degree as shown in Figure 4.After the former data stacked (as step 010), at first whether change the new angle step of packing into: the read states word corresponding to concrete frequency according to frequency---the zero-bit of variable MTCstatute, if not zero, frequency shift, the new angle step of packing into, and the zero-bit assignment that makes MTCstatute is zero, otherwise keeps former angle step (as step 011,012 and 013).Step 014 couple electrical degree Y increases new or original angle step.Afterwards as step 014~027, increase electrical degree Y and following formula behind angle step by this:
C==C。+ MsinY (C in the formula.Be initial value, M is a constant)
Look into sine table and calculate the 1st phase pwm pulse width, income value C sends into W phase register; Further phase shift 2 π/3 are looked into sine table and are calculated the 2nd phase pwm pulse width, and income value C sends into U phase register; Further phase shift 2 π/3 are looked into sine table and are calculated the 3rd phase pwm pulse width again, and income value C sends into V phase register; At last, the former data of variable Y are popped, and interrupt returning.
The interrupt routine that the SPWM waveform takes place constantly regularly carries out after beginning, value control waveform generator U201.2 with each phase register, make 30 and 31,32 and 1, the output complementation of 2 and No. 3 pin, and respectively export a phase double polarity sine ripple pulse-width signal according to the sinusoidal bipolarity triangular modulation of voltage method; And each phase place of modulating sinusoidal reference signal mutually differs 2 π/3 successively.Fig. 2 (d) has represented that using prior art to be intersected with reference to sinusoidal signal UmA, UmB and Umc with three-phase respectively by modulated triangular wave Uc in this program obtains each principle of double polarity sine ripple pulse-width signal mutually, and (a) and (b), (c) represent the 1st, 2, the 3 phase modulation signal UdA that generated, the pulse-width modulation waveform of UdB, UdC respectively.The first half of the UdA train of impulses is that No. 30 human hair combing wastes go out the waveform that receives with chip for driving U202, and the latter half is that No. 31 human hair combing wastes go out the waveform that receives with chip for driving U203; The first half of the UdB train of impulses is to go out the waveform that receives with chip for driving U204 through No. 31 human hair combing wastes, and the latter half is to go out the waveform that receives with chip for driving U205 through No. 1 human hair combing waste; The first half of the UdC train of impulses is to go out the waveform that receives with chip for driving U206 through No. 2 human hair combing wastes, and the latter half is to go out the waveform that receives with chip for driving U207 through No. 3 human hair combing wastes.Below all belong to prior art.
The present invention's the 1st embodiment frequency conversion drive system of pulse width modulation in AC motor electric diagram as shown in Figure 5, it has following modification with respect to prior art frequency conversion drive system of pulse width modulation in AC motor shown in Figure 1:
A) filter circuit that is connected with 4 of the direct current of bridge rectifier BRD201 (DC) output 1 increases capacitor 226, this capacitor is connected the back cross-over connection between dc bus VDD and ground bus with capacitor 225, formation is a common port with the series connection point of capacitor 225 and 226, exports a positive supply and the negative supply of each about 150V through dc bus VDD and ground bus;
B) C that cancellation is made up of IGBT205 and IGBT206 in inverter circuit bridge mutually, chip for driving U206 and U207, resistance R 209 and R210
C) the two phase terminal A-phase of three-phase alternating-current motor (MOTOR) M201 and B-phase still are access to inverter circuit homophase bridge mid point respectively, but the series connection point of the 3rd phase terminal C-phase reconfiguration capacitor 225 and 226;
D) about single-chip microcomputer U201, its special-purpose three-phase SPWM modulation signal switching value delivery outlet is still 4 of usefulness: 30,31,32 and No. 1 former circuit that are access to chip for driving U202, U203, U204 and U205 respectively of pin, and each inserts an XOR gate U212A, U212B, U212C and U212D and (selects model for use: CD4071BC); Enable 2 new switching value delivery outlets 10 (definition MCIA/PB1) and 11 (definition MCIB/PB2) number pin; No. 3 pin of the output of U212A connect the input of chip for driving U202, and input 2 and No. 1 pin are connected 30 and No. 10 pin of single-chip microcomputer U201 respectively; No. 4 pin of the output of U212B connect the input of chip for driving U203, and input 6 and No. 5 pin are connected 31 and No. 10 pin of single-chip microcomputer U201 respectively; No. 10 pin of the output of U212C connect the input of chip for driving U204, and input 9 and No. 8 pin are connected 2 and No. 11 pin of single-chip microcomputer U201 respectively; No. 11 pin of the output of U212D connect the input of chip for driving U205, and input 13 and No. 12 pin are connected 3 and No. 11 pin of single-chip microcomputer U201 respectively;
The main program of the present invention's the 1st embodiment frequency conversion drive system of pulse width modulation in AC motor is continued to use the main program of prior art frequency conversion drive system of pulse width modulation in AC motor shown in Figure 3, and the interrupt routine that produces SVPWM control has replaced the interrupt routine that prior art frequency conversion drive system of pulse width modulation in AC motor shown in Figure 4 produces the SPWM waveform.
Produce SVPWM control as shown in Figure 6:
---at first interrupt, judge whether to change state of a control and, perhaps all need not change according to step 101~105 then if need enter I or II or III or IV district during change from step 100; Then whether change and if pack new angle step or all constant when needing to change into, the new or original angle step of electrical degree stack according to step 106~108 determination frequency; Further according to step 109~117 pair stack new or original angle step after new electrical degree judge that the place operation interval is in I or II or III or IV district, relative set state of a control word and call subroutine SUBW1 and SUBU1, perhaps SUBW1 and SUBU2, perhaps SUBW2 and SUBU2, perhaps SUBW2 and SUBU1;
---the more detailed flow process in step 100 among Fig. 6~105 sees Fig. 7.Interrupt from step 100, step 201 makes the former data of variable Y stacked, step 202~217 are judged the state of 0#~7# position of variable Qjstatute successively and are adjusted and to gating mouth state variable PCDR assignment afterwards, promptly at first press (a) step 202~205 among Fig. 7, check the 0# of Qjstatute and the state of 1# position, determine whether that state of a control enters the I district and be F4H gating mouth state variable PCDR assignment; Otherwise press the 2# that (b) step 206 among Fig. 7~209 checks Qjstatute and the state of 3# position, determine whether that electrical degree Y state of a control enters the II district, and be F1H gating mouth state variable PCDR assignment; Otherwise press (c) step 210 among Fig. 7~4# of 213 inspection Qjstatute and the state of 5# position, determine that electrical degree Y state of a control enters the III district, and be F2H to gating mouth state variable PCDR assignment, otherwise press the 6# that (d) step 214 among Fig. 7~217 checks Qjstatute and the state of 7# position, determine that electrical degree Y state of a control enters the IV district and be F6H gating mouth state variable PCDR assignment; The result of gating mouth state variable PCDR assignment is promptly determined state as 10 and No. 11 pin of the single-chip microcomputer U201 of gating mouth;
---the more detailed flow process in step 106 among Fig. 6~118 sees Fig. 8.Wherein step 301~304 are similar to Fig. 4 step 011~014, still use variable Y, but calculating is the electrical degree of space voltage vector.At first whether change the new angle step of packing into: the read states word corresponding to concrete frequency according to frequency---the zero-bit of variable MTCstatute, if not zero, frequency shift, the new angle step of packing into, and the zero-bit assignment that makes MTCstatute is zero, otherwise keep former angle step, at last electrical degree Y is increased new or original angle step; Further according to step 305~320, check stack new or original angle step after new electrical degree Y in-scope, if 75<Y ≦ 315, whether the zero-bit of checking Qjstatute is 1, be then call subroutine SUBW1 and SUBU1 successively, otherwise assignment is to call (seeing (a) step 305~308 among Fig. 8) again after 1; If 75<Y ≦ 165, check whether the 2nd of Qjstatute is 1, be then call subroutine SUBW1 and SUBU2 successively, otherwise assignment Qjstatute call (seeing (b) step 309~312 among Fig. 8) again behind the 04H; If 165<Y ≦ 255, check whether the 4th of Qjstatute is 1, be then call subroutine SUBW2 and SUBU2 successively, otherwise assignment Qjstatute call (seeing (c) step 313~316 among Fig. 8) again behind the 10H; If 255<Y ≦ 345, check whether the 6th of Qjstatute is 1, be then call subroutine SUBW2 and SUBU1 successively, otherwise assignment Qjstatute call (seeing (d) step 317~320 among Fig. 8) again behind the 40H; By (e) step 321 among Fig. 8 the former data of variable Y are popped at last and step 118 makes and interrupts returning.The detailed process of the subprogram SUBW1 that more than calls, SUBU1, SUBW2 and SUBU2 sees (a) step 401~404 among Fig. 9 respectively, (b) step 501~504 among Fig. 9, (d) step 701~704 among (c) step 601~604 and Fig. 9 among Fig. 9, at first to electrical degree Y stack π/6 (to SUBW1 and SUBW2) or π/3 (to SUBU1 and SUBU2), look into sine table by the electrical degree Y after this stack with following formula then and calculate the count value C that specifies pwm pulse width mutually respectively:
C==C。±MsinY
In the formula, C.Be initial value; M is a constant; " ± " number gets "-" to SUBW1 and SUBU1, SUBW2 and SUBU2 got "+".All at last C is sent into W phase register (to SUBW1 and SUBW2) or U register (to SUBU1 and SUBU2) mutually, and then by waveform generator U201.2 control U201 4 still at the SPWM modulation signal switching value delivery outlet of the special use of usefulness (30,31,32 with No. 11 pin) output the 1st and the 2nd double polarity sine ripple pulse-width signal mutually, its modulation principle still can be with reference to (d) and (a) and (b) among the figure 2, but will change the phase difference of this two phase waveform among Fig. 2 into π/3 by 2 π/3.
Each XOR gate shown in Figure 3 sees among Figure 10 (a) and (b) and (c) to the output waveform relation of the gating mouth of its input and modulation signal.The output of each XOR gate drives threephase motor M201 through chip for driving U202, U203, U204 and U205 to the two-phase bridge-type 4 unit inverter circuits that IGBT201, IGBT202, IGBT203 and IGBT204 form, and is achieved as follows the voltage vector commands for controlling of definition:
Each phase voltage vector is defined in each phase terminal A-phase, the B-phase of three-phase alternating-current motor (MOTOR) M201 and instantaneous voltage Uan, Ubn, the Ucn that C-phase arrives its theoretical neutral point n.Naming these phase terminals and the voltage of ground bus again is Uao, Ubo, Uco.Capacitor 225 and 226 capacity are enough big, and Uao can perseverance be dc bus VDD half of voltage U dc of bus, i.e. 1/2Udc over the ground.The value of Ubo and Uco depends on the state of IGBT201, IGBT202, IGBT203 and IGBT204, sees Table 1.
Table 1 on off state vector (each phase brachium pontis switch element on off state) table
Ubo Uco On off state vector (each phase brachium pontis switch element on off state)
Udc Udc 1,1 (IGBT201, IGBT203 are logical, and IGBT202, IGBT204 are disconnected)
0 0 0,0 (IGBT202, IGBT204 are logical, and IGBT201, IGBT203 are disconnected)
Udc 0 1,0 (IGBT201, IGBT204 are logical, and IGBT203, IGBT202 are disconnected)
0 Udc 0,1 (IGBT203, IGBT202 are logical, and IGBT203, IGBT202 are disconnected)
Voltage U an, Ubn, Ucn can calculate by following formula:
U an = U a 0 - U n 0 = 2 3 U a 0 - 1 3 ( U b 0 + U c 0 )
U bn = U b 0 - U n 0 = 2 3 U b 0 - 1 3 ( U a 0 + U c 0 )
U cn = U c 0 - U n 0 = 2 3 U c 0 - 1 3 ( U a 0 + U b 0 )
And just like the relation of table 2 on off state vector and inverter circuit output voltage.
Table 2 on off state vector and output voltage relation
Ubo Uco Uan Ubn Ucn The on off state vector
Udc Udc —Udc/3 Udc/6 Udc/6 1?1
0 0 —Udc/3 —Udc/6 —Udc/6 0?0
Udc 0 0 Udc/2 —Udc/2 1?0
0 Udc 0 —Udc/2 Udc/2 0?1
According to each on off state vector of table 2, can be defined as the unified voltage vector Us that represents with two axis coordinate systems to Uan, Ubn, Ucn:
U s = 2 3 [ U an + U bn · e j ( 2 3 π ) + U cn · e j ( 4 3 π ) ]
Present embodiment single-chip microcomputer U201 also can adopt other chip of output three-phase symmetric double polarity Sine Wave Pulse Width Modulation signal, especially has the chip of SPWM waveform generator in the sheet, for example the 8XC196MC series of products of intel company.XOR gate U212A, U212B, U212C and U212D also can adopt other logical circuit to replace, and only need total output and input to keep the XOR gate relation to get final product.In addition, also can use (common is 2) the unit drives chip that has paired input and output even number, if these paired input and output are amplified the relation except that following, also has other logical relation, then can be by prior art about the design of circuit and program, comprehensive these logical relations make 30,31,32, No. 11 pin and 10, No. 11 pin to G utmost points of each IGBT of single-chip microcomputer U201 keep aforementioned control relation.
The difference of the present invention the 2nd embodiment and the 1st embodiment only is:
---in the electrical diagram, (MOTOR) M201 changes symmetrical two-phase alternating current motor into as shown in Figure 3, and two phase terminal A-phase and B-phase still are access to inverter circuit homophase bridge mid point respectively; But its public terminal COM replaces the 3rd phase terminal C-phase of former threephase motor to connect the series connection point of capacitor 225 and capacitor 226;
---in (a) and (b), (c) and the step 401 (d), 501,601 and 701, electrical degree stack π/6 are changed into 0 among Fig. 9, stack π/3 change pi/2 into.
The present invention's the 2nd embodiment motor uses traditional single phase permanent split capacitor motor space to differ the two-phase symmetrical magnetic circuits structure of pi/2 electrical degree, even also symmetrical structure (for example washing machine motor) of two-phase winding.Certainly, also can use two-phase magnetic circuit or winding to owe the motor of symmetry.At this moment,, adjust the control signal of modulation circuit, make the two-phase current I of inverter circuit output by calculating or experiment aAnd I b, according to effective turn (winding coefficient * actual number of turn) K of motor two-phase winding DpaW aAnd K DpbW b, meet the circular rotating magnetic potential condition of the two-phase motor symmetrical operation of following formulate fully:
I aK dpaW a=±j?I bK dpbW b
For space electrical degree θ is the two-phase winding motor of the non-orthogonal axes of arbitrary value, and the formula of this condition is:
I aK dpaW a=I b?K dpbW b?e j(π±θ)
Be that inverter circuit produces the symmetrical two-phase control about two-phase motor.

Claims (4)

1, a kind of pulse width modulation frequency changing driving system for economical AC motor comprises by DC power supply and is controlled by the inverter circuit of controlling organization and the alternating current motor of driving thereof;
---described DC power supply is exported a positive pole, a negative pole and a zero potential common port;
---described inverter circuit is the two-phase bridge-type, being included in is connected in series between positive supply bus and the negative supply bus the 1st goes up the brachium pontis switch element mutually and descends the brachium pontis switch element mutually with the 1st, and is connected in series and the 2nd goes up the brachium pontis switch element mutually and descend the brachium pontis switch element mutually with the 2nd; Positive supply bus, negative supply bus are access to described dc power anode, negative pole respectively;
---described motor is a threephase motor, and its three-phase terminal is access to described DC power supply zero potential common port and inverter circuit respectively, and each goes up the series connection point of brachium pontis switch element and following brachium pontis switch element mutually;
---described controlling organization is to the control end output modulation signal of inverter circuit two-phase brachium pontis switch element; It is characterized in that:
---described controlling organization comprises a single-chip microcomputer, and it comprises 6 switching value delivery outlets: the 1st goes up brachium pontis modulation signal mouth, the 1st mutually descends brachium pontis modulation signal mouth, the 2nd to go up brachium pontis modulation signal mouth, the 2nd mutually to descend brachium pontis modulation signal mouth, the 1st phase gating mouth, the 2nd phase gating mouth mutually mutually;
---described controlling organization comprises 4 XOR gate: the 1st goes up brachium pontis control XOR gate, the 1st mutually descend brachium pontis control XOR gate, the 2nd to go up brachium pontis mutually to control XOR gate and the 2nd and descend brachium pontis to control XOR gate mutually mutually; Described each modulation signal mouth is access to an input with identical brachium pontis control XOR gate respectively, and the output of each gating mouth is access to another input of homophase XOR gate respectively, and the output of each XOR gate is access to the control end of inverter circuit with identical brachium pontis switch element;
---the output characteristic of described 4 the modulation signal mouths of described Single-chip Controlling is: the output complementation of the output of brachium pontis modulation signal mouth and following brachium pontis modulation signal mouth on the homophase, export a phase double polarity sine ripple pulse-width signal according to the sinusoidal bipolarity modulation method of voltage, and the 1st modulates sinusoidal reference signal and the 2nd mutually to modulate the phase difference of sinusoidal reference signal mutually is π/3;
---described each the gating mouth of described Single-chip Controlling constitutes each the space voltage vector pulse-width modulation (SVPWM) of brachium pontis switch element on off state mutually of the described inverter circuit of control with the state of modulation signal mouth through each XOR gate output.
2, according to the described pulse width modulation frequency changing driving system for economical AC motor of claim 1, it is characterized in that: described Single-chip Controlling comprises an interrupt routine, and this interrupt routine comprises the steps:
---check described on off state and gating mouth state is set by this state;
---the voltage vector instruction to described space voltage vector pulse-width modulation changes the regulation electrical degree;
---according to interval of living in after the described voltage vector change regulation electrical degree, described on off state and modulation signal mouth state are set.
3, a kind of pulse width modulation frequency changing driving system for economical AC motor comprises by DC power supply and is controlled by the inverter circuit of controlling organization and the alternating current motor of driving thereof;
---described DC power supply is exported a positive pole, a negative pole and a zero potential common port;
---described inverter circuit is the two-phase bridge-type, being included in is connected in series between positive supply bus and the negative supply bus the 1st goes up the brachium pontis switch element mutually and descends the brachium pontis switch element mutually with the 1st, and is connected in series and the 2nd goes up the brachium pontis switch element mutually and descend the brachium pontis switch element mutually with the 2nd; Positive supply bus, negative supply bus are access to described dc power anode, negative pole respectively;
---described motor is symmetrical two-phase motor, and the common port of its two-phase winding is access to described DC power supply zero potential common port, and the other end of each phase winding is access to the mid point of each phase brachium pontis of inverter circuit respectively;
---controlling organization, to the control end output modulation signal of inverter circuit two-phase brachium pontis switch element; It is characterized in that:
---described controlling organization comprises a single-chip microcomputer, and it comprises 6 switching value delivery outlets: the 1st goes up brachium pontis modulation signal mouth, the 1st mutually descends brachium pontis modulation signal mouth, the 2nd to go up brachium pontis modulation signal mouth, the 2nd mutually to descend brachium pontis modulation signal mouth, the 1st phase gating mouth, the 2nd phase gating mouth mutually mutually;
---described controlling organization comprises 4 XOR gate: the 1st goes up brachium pontis control XOR gate, the 1st mutually descend brachium pontis control XOR gate, the 2nd to go up brachium pontis mutually to control XOR gate and the 2nd and descend brachium pontis to control XOR gate mutually mutually; Described each modulation signal mouth is access to an input with identical brachium pontis control XOR gate respectively, and the output of each gating mouth is access to another input of homophase XOR gate respectively, and the output of each XOR gate is access to the control end of inverter circuit with identical brachium pontis switch element;
---the output characteristic of described 4 the modulation signal mouths of described Single-chip Controlling is: the output complementation of the output of brachium pontis modulation signal mouth and following brachium pontis modulation signal mouth on the homophase, export a phase double polarity sine ripple pulse-width signal according to the sinusoidal bipolarity modulation method of voltage, and the 1st modulates sinusoidal reference signal and the 2nd mutually to modulate the phase difference of sinusoidal reference signal mutually is pi/2;
---described each the gating mouth of described Single-chip Controlling constitutes each the space voltage vector pulse-width modulation (SVPWM) of brachium pontis switch element on off state mutually of the described inverter circuit of control with the state of modulation signal mouth through each XOR gate output.
4, according to the described pulse width modulation frequency changing driving system for economical AC motor of claim 3, it is characterized in that: described Single-chip Controlling comprises an interrupt routine, and this interrupt routine comprises the steps:
---check described on off state and gating mouth state is set by this state;
---the voltage vector instruction to described space voltage vector pulse-width modulation changes the regulation electrical degree;
---according to interval of living in after the described voltage vector change regulation electrical degree, described on off state and modulation signal mouth state are set.
CNB2005100370508A 2005-09-02 2005-09-02 A kind of pulse width modulation frequency changing driving system for economical AC motor Expired - Fee Related CN100544188C (en)

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CN101895247B (en) * 2010-07-02 2012-07-11 哈尔滨工程大学 Rotational speed governor of driving motor of submersible propeller
CN102005960B (en) * 2010-11-30 2013-02-06 中国汽车技术研究中心 Inverter with three bridge arms and nine switches for dual-alternating-current motor drive and control method thereof

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* Cited by examiner, † Cited by third party
Title
两相异步电动机变频调速装置. 韩英桃,吴斌.微特电机,第1996卷第4期. 1996
两相异步电动机变频调速装置. 韩英桃,吴斌.微特电机,第1996卷第4期. 1996 *

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