CN103227598B - Permanent magnet motor controller with voltage dip protection function - Google Patents
Permanent magnet motor controller with voltage dip protection function Download PDFInfo
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Abstract
The invention relates to a variable frequency control device of a permanent magnet synchronous motor for voltage dip protection. The device can realize a variable frequency speed regulation function for the permanent magnet synchronous motor and automatically detect a network voltage condition in real time, judges the starting time and the stopping time of voltage dip by compiling a microprocessor software program, and ensures that the operation condition of the motor is unaffected when the motor has the voltage dip. In addition, and the adjustable voltage dip protection time can be set according to a hardware key and an upper computer monitoring system.
Description
Technical field
The present invention relates to permanent magnet motor controller field, particularly a kind of permanent magnet motor controller with voltage collapse protection.
Background technology
Rare-earth permanent-magnet synchronous motor is the high performance motor of a class, has high efficiency, High Power Factor, without advantages such as excitation losses, is widely used in fields such as family expenses, automobile-used industry, textile industry, mines, oil field.The present invention is with oil field rare-earth permanent-magnet synchronous motor for control object, and design has the control system of reactance voltage fall protection function.When the maximum feature of oil field pumping motor is upstroke, load is large; During down stroke, load is little, efficiency is low.Because pumping motor oil well in oil pumping process deepens gradually, its load also reduces gradually, in oil pumping process, motor speed and load are not unalterable, need on the one hand to realize oil field pump delivery with oil well penetrating power matches by changing rotating speed, the load of another aspect motor in oil pumping process upstroke and down stroke load also different.Universal frequency converter is more common on the market at present, and give full play to the superior function of permanent magnet synchronous motor, the best way is exactly to adopt the frequency-converting speed-governing control system adapted with it.
Voltage Drop problem be the most often occur in current distribution system and unavoidable voltage disturbance phenomenon, usually electric power system be short-circuited fault, reclosing, thunderbolt, same section of large capacity equipment starts or the reason such as fault, switching manipulation causes falling in short-term of voltage.According to IEC61000-4-30 standard, Voltage Drop confession under directions piezoelectric voltage is reduced to suddenly nominal voltage U
c90% and 1% between a value, then recover normal within very short time.The duration of Voltage Drop is usually between 10ms and 1 minute.In recent years; microprocessor, power electronic device are widely used in electric field; accelerate novel electric equipment on the one hand to intelligent, miniaturization; the sensitiveness of these equipment to Voltage Drop also brings series of problems on the other hand; Voltage Drop often causes even damaging based on the electric equipment misoperation of microprocessor and power electronic device, and this kind of novel electric product can stable operation to be therefore necessary to take corresponding Voltage Drop safeguard measure to ensure.Motor frequency change control device is exactly a control appliance based on microprocessor and power electronic device, and microprocessor, control circuit, signal acquisition circuit, telecommunication circuit etc. all requirement will have stable power supply guarantee control device stable operation.Generally speaking, when supply power voltage lower than nominal value 80% time, often cause Microprocessor S3C44B0X misprogramming, cause the misoperation of some power electronic device simultaneously, and then affect the normal work of motor, even cause motor failure, cause economic loss.Especially for quantity-produced oil, chemical enterprise; motor often interlocks with a series of mechanical mechanism; electrical network Voltage Drop in short-term often causes whole production line work disorder even to paralyse; bring about great losses to economical production; even bring Personal Risk to operating personnel, therefore Voltage Drop protection is necessary for industrial production.Electric Machine Control frequency converter increases reactance voltage fall protection function, will have broad application prospects.
Summary of the invention
The object of this invention is to provide a kind of permanent magnet motor controller with voltage collapse protection.The frequency control function to permanent magnet synchronous motor can be realized, and in automatic detection of grid voltage condition in real time, can also ensure that motor does not affect motor running condition when Voltage Drop occurs.
The present invention adopts following scheme to realize: a kind of permanent magnet motor controller with voltage collapse protection, it is characterized in that: comprise three phase rectifier module, voltage signal detection module, high frequency switch power, voltage extraction circuit, inverter bridge protective circuit, filtering capacitor group and equalizer circuit thereof, soft starting circuit, indicating circuit, back-up source, braking circuit, relatively drive circuit, current transformer, signal conditioning circuit, isolated drive circuit, fault detection module, signal processing module, back-up source charge circuit, back-up source discharge loop, back-up source voltage detecting circuit, isolated form line sampling circuit, constant current charge loop, charging current detecting circuit, constant voltage charge loop, isolated form line sampling circuit, first ON-OFF control circuit, second switch control circuit, first central control module and the second central control module, ipc monitor platform, the input of three-phase alternating voltage through output one tunnel of three phase rectifier module as described high frequency switch power, this high frequency switch power is that motor frequency change controls and the realization of Voltage Drop protection is powered, and the one end on another road is connected with the input of described soft starting circuit, the output of this soft starting circuit and described voltage signal detection module three-phase alternating voltage is scaled after be input in the second central control module, back-up source charge circuit described in one output of described second central control module connects, output one tunnel first ON-OFF control circuit of described back-up source charge circuit is connected with described constant current charge loop, and another road is connected with described constant voltage charge loop through second switch control circuit, the positive pole of described back-up source is connected with the output in described constant voltage charge loop, the positive pole of described back-up source is connected with discharge loop after the first switching tube, described back-up source voltage detecting circuit is connected with described isolated form line sampling circuit, and the magnitude of voltage of back-up source of sampling feeds back to described second central control module, filtering capacitor group and equalizer circuit, voltage extraction circuit, indicating circuit, braking circuit, inverter is connected between described soft starting circuit output head anode and three phase rectifier module negative pole of output end, output one tunnel of described voltage extraction circuit is compared through signal and is connected with described soft starting circuit with drive circuit, and another road is compared drive circuit through signal and is connected with the control end of described braking circuit, the first described central control module gathers the rotating speed of bus three-phase voltage, electric current, motor three-phase electricity flow valuve and motor rotation by voltage transformer, current transformer and position detecting module EN, this first central control module is also connected with host computer and isolated drive circuit, and with described second central control module communication, described isolated drive circuit is connected with described inverter.
In an embodiment of the present invention, described high frequency switch power comprises a filter circuit, high frequency transformer, switching power source chip, MOSFET pipe, feedback circuit, over-voltage and over-current testing circuit, current-limiting resistance and transient suppressor; The direct voltage of pulsation changes into comparatively after galvanic current pressure by described filter capacitor, and its positive pole is connected to the different name end of high frequency transformer armature winding, and the source electrode of described switching power source chip is connected to the Same Name of Ends of high frequency transformer armature winding; The drain electrode end series connection MOSFET pipe of described switching power source chip; When the metal-oxide-semiconductor conducting that switching power source chip is built-in, the source voltage of MOSFET pipe is low level, makes the conducting of MOSFET pipe; When the metal-oxide-semiconductor cut-off that switching power source chip is built-in, MOSFET pipe ends; Current-limiting circuit, plays metering function; Transient suppressor, on restriction MOSFET pipe, dividing potential drop amount is lower than its withstand voltage; Described signal deteching circuit detects the voltage that three phase rectifier module exports; The input of described high frequency transformer is provided with clamp circuit; Whether normal described feedback circuit feed back the secondary output voltage of described high frequency transformer thus the duty ratio of by-pass cock power supply chip work.
In an embodiment of the present invention, LCD, key circuit that the first described central control module comprises a central processing element and is connected with this central processing element.
In an embodiment of the present invention, described soft starting circuit is made up of IGBT pipe, current limliting module and the first protective circuit, one end of described current limliting module is connected with the collector electrode of described IGBT1 pipe and an output of three phase rectifier module, and the other end is connected with the emitter of described IGBT1 pipe and the input of the first protective circuit; The output of described protective circuit is as the output of described soft starting circuit; Described signal compares and is connected with the base stage of the output of isolated drive circuit with described IGBT1 pipe.
In an embodiment of the present invention, described back-up source by after multiple super capacitor is connected again parallel connection form, and this back-up source is also provided with and all presses flow equalizing circuit.
In an embodiment of the present invention, described back-up source charge circuit comprises isolation drive and protective circuit IGBT manages, freewheeling circuit, accumulator; The drive singal that described second central control module exports triggers IGBT pipe through isolation drive and protective circuit and works, to reduce the charging voltage of back-up source.
The present invention devises a kind of permanent magnet synchronous motor frequency-converting control device for Voltage Drop protection; this device can not only realize the frequency control function to permanent magnet synchronous motor; and can also in automatic detection of grid voltage condition in real time; by writing microprocessor software program; realize the judgement to Voltage Drop generation start/stop time, ensure that motor does not affect motor running condition when Voltage Drop occurs.Meanwhile, adjustable Voltage Drop guard time can be set according to hardware button and Monitor Computer Control System.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention.
Fig. 2 is that the present invention one specific embodiment circuit theory connects block diagram.
Being labeled as wherein in figure: three phase rectifier modules A; Filter circuit D; Detecting voltage by three phase module U; High frequency transformer Y; Switching power source chip S; MOSFET pipe Q; Feedback circuit T; Over-voltage and over-current testing circuit R3; Current-limiting circuit R1; Transient suppressor R2; Clamp circuit P; Filter capacitor group F1; Equalizer circuit F2; Voltage extraction circuit G; Signal compares and modulate circuit C3; Isolated drive circuit C2; Protective circuit C1; IGBT pipe B1; Current limliting module B3; Protective circuit B2; Brake resistance I1; Comparison circuit E3; Drive circuit E2; IGBT pipe I2; Current transformer K1; Signal conditioning circuit K2; Isolated drive circuit O; Button KB; Fault detection module L1; Signal processing module L2; Optical coupling isolation circuit L3; Z10 is accumulator 1; Z11 freewheeling circuit 1; Z16 is accumulator 2; Second switch pipe Z17; Z20 is freewheeling circuit 2; Z15 is insulation blocking module; Z2 is back-up source voltage detection circuit; Z3 is isolated form line sampling circuit; Signal condition and isolation module Z4; Optical couple isolation drive circuit Z19; Power sense circuit Z2; Constant current charge loop CC; Protective circuit Z12; Isolated drive circuit Z13, switching tube Z9; Semiconductor switch Z5; Constant-current control circuit Z7; Semiconductor switch Z6; Current sampling circuit Z1; Isolation module Z4; COM is ipc monitor platform; Constant voltage charge loop CV; Constant-voltage control circuit Z8; First switching tube Z14; Voltage transformer J1; Voltage sample modulate circuit J2; E1 braking circuit switching tube protection module; H1 dividing potential drop current-limiting circuit; H2 electrification indicating circuit; Z18 discharge circuit protection module; M1 inverter bridge protective circuit; W is high frequency switch power; F is Capacitor banks and equalizer circuit thereof; Soft starting circuit B; H is indicating circuit; X is back-up source; I is braking circuit; E is that signal compares and drive circuit; N is back-up source discharge circuit; T1 is the first ON-OFF control circuit; T2 is second switch control circuit; Z is back-up source charge circuit.
High frequency transformer Y each road output action:
8 as soft start drive circuit C2 power supply;
9 as three phase inverter bridge (M) driving power;
10 as position detecting module (EN) power supply;
11 power source circuit switch tube drive circuit power supplies in support;
12 as CPU 1 the power supply of CPU 2.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
Refer to Fig. 1, the present embodiment provides a kind of permanent magnet motor controller with voltage collapse protection, it is characterized in that: comprise three phase rectifier modules A, filter circuit D, detecting voltage by three phase module U, high frequency transformer Y, voltage extraction circuit G, current transformer K1, signal conditioning circuit K2, isolated drive circuit O, fault detection module L1, signal transacting isolation module L, back-up source charge circuit Z, back-up source voltage detecting circuit Z2, isolated form line sampling circuit Z3, optical couple isolation drive circuit Z19, constant current charge loop CC, charging current detecting circuit A1, ipc monitor platform COM, constant voltage charge loop CV, inverter bridge protective circuit (M1), position detecting module (EN), high frequency switch power W, Capacitor banks and equalizer circuit F thereof, soft starting circuit B, indicating circuit H, back-up source X, braking circuit I, relatively drive circuit E, back-up source discharge loop N, first ON-OFF control circuit T1, second switch control circuit T2, first central control module U1 and the second central control module U2, the input of three-phase alternating voltage through output one tunnel of three phase rectifier modules A as described high frequency switch power W, this high frequency switch power W is that motor frequency change controls and the realization of Voltage Drop protection is powered, and the one end on another road is connected with the input of described soft starting circuit B, the output of this soft starting circuit and described voltage signal detection module U three-phase alternating voltage is scaled after be input in the second central control module U2, described in one output of described second central control module U2, back-up source charge circuit Z connects, the output one tunnel first ON-OFF control circuit T1 of described back-up source charge circuit Z is connected with described constant current charge loop CC, and another road is connected with described constant voltage charge loop CV through second switch control circuit T2, described constant current charge loop CC is connected with back-up source X positive pole with the output of constant voltage charge loop CV, the positive pole of described back-up source X is connected with discharge loop N through the first switching tube Z14, described back-up source voltage detecting circuit Z2 is connected with described isolated form line sampling circuit Z3, and the magnitude of voltage of the back-up source X that samples feeds back to described second central control module U2, Capacitor banks and equalizer circuit F, voltage extraction circuit G, indicating circuit H, braking circuit I, inverter M is connected between the two-way of described three phase rectifier module exports, output one tunnel of described voltage extraction circuit G is connected with described soft starting circuit B through amplification driving circuit C, and another road is compared through signal and is connected with the control end of described braking circuit I with drive circuit E, the rotating speed that the first described central control module U1 is rotated by voltage transformer, current transformer J1, K1 and position detecting module EN collection busbar voltage and electric current, motor three-phase electricity flow valuve and motor, this first central control module U1 is also connected with host computer COM and isolated drive circuit O, and with described second central control module U2 communication, described isolated drive circuit O is connected with described inverter M.
Below motor frequency change controlling functions, Voltage Drop defencive function are described in detail.Schematic diagram is shown in Fig. 2.
motor frequency change controlling functions
Three-phase alternating voltage is from 1, and 2,3 terminations enter, and a road input three phase rectifier modules A, another road directly supplies the voltage signal detection module U with isolation voltage sampling functions.Filtering is carried out through filter circuit D in output one tunnel of three phase rectifier modules A, and when line voltage is normal, this road is as the input of variable frequency control module.Be input to after detecting voltage by three phase module U is scaled by three-phase alternating voltage in chip CPU2, CPU2 has the management function of Voltage Drop differentiation and back-up source, further judgement is identified to line voltage, this sample mode greatly reduces adjunct circuit to the interference of line voltage sampled signal and impact, improves the accuracy and reliability that have judged.Introduce respectively below.
Output after the rectification of three phase rectifier modules A is divided into two-way:
(1) one tunnel is after filter circuit D alternating current transfers level and smooth direct voltage to, and its positive pole is connected to the different name end of high frequency transformer Y armature winding, and the source electrode of switching power source chip S is connected to the Same Name of Ends of high frequency transformer Y armature winding.Because electrical network input voltage range is wider, and the withstand voltage basic designing requirement that cannot meet this circuit at about 900V of MOSFET that switching power source chip common on the market is at present built-in, therefore at the drain electrode end series connection MOSFET pipe Q of switching power source chip S, to improve overall withstand voltage level.When the metal-oxide-semiconductor conducting that switching power source chip S is built-in, the source voltage of MOSFET pipe Q is low level, makes Q conducting; When the metal-oxide-semiconductor cut-off that switching power source chip S is built-in, MOSFET pipe Q ends, and the voltage on such main circuit is just assigned on switching power source chip S and MOSFET pipe Q; R1 is current-limiting circuit, plays metering function; R2 is transient suppressor, and on restriction MOSFET pipe Q, dividing potential drop amount is lower than its withstand voltage, avoids exceeding withstand voltage and damages; R3 is signal deteching circuit, detects outside voltage and current signal and whether exceedes requirement.After switching power source chip S starts, if feedback end load remains unchanged, then work under the duty ratio set when switching power source chip S can remain on design, high frequency transformer Y secondary output voltage is normal.When feedback output end 12 changes, now feedback circuit T can change the magnitude of current feeding back to S, thus regulates the duty ratio of S work, ensures the stability of output voltage.Outside over-voltage and over-current testing circuit R3 is that circuit is expanded in the periphery of switching power source chip S, by arranging rational power limiting resistor and line voltage detection resistances carrys out the outside ductility limit of chip monitoring, and the function of the overvoltage of realizing circuit, under-voltage, overcurrent protection.Switching power source chip S and metal-oxide-semiconductor Q is operated in high frequency state, when Q ends, easily peak voltage is produced because high frequency transformer Y exists leakage inductance, not only easily damage switching tube Q and chip S, the current sample of peripheral circuit and the stability of output voltage also can be affected time serious, so, devise clamp circuit P, the function of P consumes this part energy exactly, is limited in the instantaneous overvoltage that switching tube occurs.In figure, R1, R2, R3, P, Q, S, T, Y together constitute high frequency switch power, and its realization being motor frequency change controlling functions and Voltage Drop are protected provides required DC power supply.
(2) another road is input in the main circuit of frequency-variable controller.Direct voltage after rectifying and wave-filtering needs Capacitor banks and equalizer circuit F thereof after filtering, and this equalizer circuit F comprises filter capacitor group F1 and equalizer circuit F2, and the first capacitance group F1 after filtering of direct voltage obtains galvanic current pressure.In order to meet the requirement of main circuit and capacity withstand voltage to electric capacity, filtering capacitor group F1 is by the identical electric capacity series and parallel of several specifications, but due to the difference of monomer electric capacity in actual capacity, technique, insulation resistance etc., the voltage easily causing electric capacity in parallel to bear is not identical, and then cause over-voltage breakdown, therefore the present invention is realized the voltage-sharing of parallel resistance by equalizer circuit F2.
Capacity due to filter capacitor is very large and bus direct voltage is higher, and system electrification moment jumbo storage capacitor is equivalent to " short circuit ", causes very large instantaneous charge current; Excessive impulse current, easily causes three phase rectifier module to be damaged because of heavy overload, even burns out filter capacitor, therefore devises reliable soft starting circuit B, is made up of B1, B2, B3 in figure.During starting; soft start current-limiting circuit B3 connects on the main circuit; in order to limiting starting current; after system normally starts; busbar voltage is detected by voltage extraction circuit G; once electric capacity has been charged to suitable state, is compared by signal and triggered IGBT pipe B1 conducting with modulate circuit C3, isolated drive circuit C2, protective circuit C1, thus by current-limiting circuit B3 short circuit.Because semiconductor switch device all only has the unidirectional general character usually, in order to avoid the reverse current produced during the electric discharge of shutdown momentary capacitance impacts IGBT pipe B1, devise bus protection circuit B2, block reverse current path.H1, H2 constitute indicating circuit H, can be used to the normal electrifying condition of indicating circuit on the one hand, can be used to the discharge condition indicating bulky capacitor on the other hand when down circuitry, avoid directly touching causing Personal Risk.
Braking circuit I is an indispensable part in the entire system, and the effect of this braking circuit I is the energy that consumption motor produces in frequency reducing moderating process.If this energy is directly fed back to main circuit, easily make DC bus-bar voltage raise, cause storage capacitor and inversion module to damage because of transient overvoltage and even burn out equipment, therefore the present invention devises rational braking circuit.Braking circuit is constituted by brake resistance I1, IGBT pipe I2 in figure.Control device in the course of the work; by voltage extraction circuit G Real-Time Monitoring main circuit voltage; IGBT pipe I2 is triggered via comparing drive circuit E; this compares drive circuit E and comprises comparison circuit E3, drive circuit E2 and braking circuit switching tube protection module E1; in figure; this voltage extraction circuit G Real-Time Monitoring main circuit voltage; via comparison circuit E3; judge whether to exceed brake voltage limit value; once voltage is greater than set point; comparison circuit E3 exports brake signal to drive circuit E2, triggers IGBT pipe I2 conducting, by dump energy consumption on brake resistance I1.
System realizes by chip CPU1 motor internal finder control inverter after soft start, thus realizes applying voltage to permanent magnet motor, completes the initial alignment work of permanent magnet synchronous motor.This signal, to provide the parameter required for CPU1 program, is sent to host computer via SCI serial communication simultaneously, shows in real time by the voltage on instrument transformer J1 real-time sampling bus, electric current.
The realization controlled motor frequency change is the control realizing inverter by the execution of CPU1 software program, and alternating voltage direct voltage being converted to different frequency is transported to REPMSM three-phase windings, controls motor and rotates under different rotating speeds.What CPU1 performed is based on SVPWM double-closed-loop control program: after first motor three-phase current carries out isolation sampling by current transformer (K1), via input chip CPU1 after ac sampling signal modulate circuit (K2) process, ensure the current signal phase place that samples and to be actually consistent, within the scope of sampled voltage that maximum amplitude allows at CPU1, as the electric current loop real time data of two close cycles software control procedure; By software program, coordinate transform is carried out to current signal again, the three-phase current be in three-phase static coordinate system is converted to and is being in the current i on two-phase rotating coordinate system d-q
d, i
q, the feedback parameters needed for inner ring in double-closed-loop control program is provided.Secondly, the rotating speed measured motor rotates by position detecting module EN is measured, the signal that encoder exports is a series of pulse, therefore this signal is input to pin corresponding to the built-in orthogonal coding module of chip CPU1, thus by internal processes judge that motor rotates turn to, rotating speed and rotor-position, as the parameter of der Geschwindigkeitkreis feedback.By feedback parameters and set-point, (der Geschwindigkeitkreis set-point is the predetermined motor rotary speed of user; The set-point of electric current loop, direct-axis current set-point is 0, quadrature axis current set-point is that the difference of given rotating speed and actual speed is again through value that speed regulator obtains) compare separately after, then export via current regulator, speed regulator the parameter performed required for SVPWM control algolithm.Chip CPU1 obtains driving three couples of drive singal c1 required for three-phase inverter by performing SVPWM control algolithm.In order to avoid the interference of chip CPU1 acceptor current high voltage, the transmission between the two signal must carry out necessary isolation.SVPWM drive singal c1 by isolated drive circuit O carry out amplifying with isolate after, three pairs of brachium pontis that driving inverter M is corresponding respectively.After electric motor starting, the first initial speed (being generally rated speed) of working procedure acquiescence, then, external key KB can be passed through, or send running frequency instruction by host computer, change the running frequency (or rotating speed) that motor is given, thus realize changing motor operation speed.
The hardware circuit of PMSM controller is in high-voltage state, and power electronic device has strict requirement to operating voltage, operating current, can bear maximum voltage and electric current, easily damaging device once exceed.Need design protection circuit.Error protection mainly contains DC bus overvoltage, overcurrent protection, under-voltage protection, the anti-straight-through protection of SVPWM signal etc.In figure, fault detection module L1 is made up of circuit such as signals collecting, multilevel iudge, the outputs of fault-signal signal, Real-Time Monitoring main circuit voltage, current amplitude, once circuit occurs that overvoltage, overcurrent, the fault such as under-voltage export fault-signal e immediately, through signal processing module L2 by occur all kinds of fault-signal merger be that single fault-signal d2 is transported in the error protection pin of isolated drive circuit O, trigger drive circuit quit work; This isolated drive circuit O devises the failure protection function preventing the conducting simultaneously of same brachium pontis drive singal on the other hand, once any pair signal simultaneously for high level is about to cause the conducting simultaneously of same brachium pontis, export straight-through fault-signal d1 to fault processing module L2; All hardware faults are accumulated single fault-signal f and are transported in optical coupling isolation circuit L3 by fault processing module L2; output signal b is connected to the power protection pin of chip CPU1; the flip chip CPU1 error protection immediately once break down; stop exporting SVPWM drive singal; inverter bridge quits work; motor stopping, waits to be repaired.
voltage Drop defencive function:
After motor normally starts, be connected with chip CPU2 by the detecting voltage by three phase module U independently with isolation voltage sampling functions, can Real-Time Monitoring voltage on line side, to judge whether Voltage Drop fault occurs.
Alternating voltage is contracted within the scope of the maximum sampled voltage of chip CPU2 line linearity isolation of going forward side by side by voltage signal detection module U, guarantees can obtain actual value accurately after software program amplifies in proportion.The intelligent algorithm that inner programming is write voluntarily in chip CPU2 with to sampled voltage signal h process, the start/stop time that identification Voltage Drop occurs.The method judged has two kinds: the effective value or the DC bus-bar voltage after directly can measuring rectification that 1. calculate the ac voltage signal of real-time sampling, if effective value or busbar voltage are lower than 80%U
n, the determining program of Voltage Drop realizes in CPU2; 2. the software program of the Voltage Drop characteristic quantity detection algorithm combined with intelligent control algorithm based on wavelet packet is write; the characteristic value of Voltage Drop is extracted from the alternating voltage of sampling; judge the start/stop time that Voltage Drop occurs, immediately to take safeguard measure.
Back-up source X by after multiple super capacitor X1 connects again parallel connection form, to meet the demand of main circuit to capacitance, but the capacity of monomer electric capacity, initial voltage, internal resistance all can not be identical, the time that each electric capacity is full of electricity is also different, therefore be necessary to design the equalizer circuit Y1 preventing overvoltage to charge, equalizer circuit Y1 mono-aspect ensure that the voltage that the electric capacity that each is connected bears is consistent, ensure that electric capacity can not exceed the magnitude of voltage of setting in charging process simultaneously.
When chip CPU2 detects that line voltage falls, back-up source drops into main circuit in time, and from 6,7 terminations enter, and provides enough voltage to inverter bridge, makes the running status of motor unaffected.What back-up source discharge circuit adopted is the form of step-up discharge, is made up of in figure based on the charging module N of DC boosting Boost circuit accumulator Z16, switching tube Z17, freewheeling circuit Z20.During Voltage Drop, chip CPU2 output drive signal p triggers the first switching tube Z14 conducting through isolation drive module Z15, connects discharge loop; Back-up source voltage detection circuit Z2, Z3 sampling back-up source magnitude of voltage, feeds back to direct voltage (AC380V occasion, the U needed for duty ratio calculation procedure Duan Zhongyu main circuit
dC=540V) compare conversion, determine the duty ratio of PWM drive singal, for avoiding forceful electric power to the interference of microprocessor, affect the execution of program, the drive singal i of output triggers optical couple isolation drive circuit Z19, makes its secondary export corresponding level, control second switch pipe Z17 work, from 6,7 ends export the voltage after promoting to the normal operating voltage of main circuit, and during guarantee Voltage Drop, motor runs well.When chip CPU2 monitor grid voltage sags fault recovery normal time, drive singal p saltus step is low level, cuts off discharge loop, and stop sending booster circuit PWM drive singal, booster circuit quits work simultaneously.
Meanwhile, the software program that programming Voltage Drop guard time is adjustable in chip CPU2, can arrange maximum voltage protection time t
x, initial default t0=1min in program.If the Voltage Drop time is less than t
xand chip CPU2 detects that supply power voltage recovers normal, then back-up source stops powering to main circuit; If when voltage dip duration exceedes the maximum time of protection, chip CPU2 controls charging circuit and quits work, and sends information in chip CPU1 simultaneously, controls complete machine and quits work.
IEC61000-4-30 standard specifies: voltage die-offs the duration usually between 10ms and 1min, and amplitude is between 90% ~ 1% of nominal voltage.
Line voltage is when normal condition, and back-up source testing circuit Z2, Z3 periodically detect electricity, to guarantee that back-up source electricity is sufficient, chip CPU2 once back-up source undertension be detected, demand working charge circuit.Back-up source charge circuit adopts step-down Buck charge mode; be made up of Z12, Z13, Z9, Z10, Z11; according to main circuit voltage and the maximum charging voltage ratio determination reduction voltage circuit switching tube PWM drive singal l duty ratio of back-up source; the drive singal l that chip CPU2 exports is through isolation drive and protective circuit Z13; Z12 trigger switch pipe Z9 works, and reduces charging voltage.The working method that back-up source charging modes adopts constant current to combine with constant voltage charge.When starting to charge, adopt the form of constant current charge, send triggering signal by software program and drive constant current charge loop CC to work; Maximum charging voltage is preset in the software program of chip CPU2, the back-up source of cycle detection simultaneously voltage, all the time putting drive singal m when back-up source voltage does not reach limit value is high level, through isolation control circuit Z7 triggered semiconductor switching device Z5 conducting all the time, constant current charge loop CC continuous firing; The supply voltage value sampled once chip CPU2 reaches setting limit value, connects constant voltage charge loop CV; Now, drive singal n is high level, through isolation control circuit Z8 triggered semiconductor switch Z6 conducting, and constant voltage charge loop starts, arrange drive singal m is low level simultaneously, cuts off constant current charge loop; In the process of constant voltage charge, charging current is changed into voltage after signal condition and isolation module Z4 periodic sampling by current sampling circuit Z1 by chip CPU2, charge circuit judges that whether charging current is close to minimum, once meet the demands, can judge that back-up source is full of electricity, chip CPU2 stops sending drive singal n, cuts off constant voltage charge loop, stop sending reduction voltage circuit PWM drive singal l, charge circuit quits work simultaneously.
Above-mentioned known, whole device comprises two CPU, and hardware display LCD, host computer directly communicates with chip CPU1, therefore the information such as back-up source electricity are observed to realize on LCD and ipc monitor platform, reduce the complexity of hardware, it may be necessary the information transmission that corresponding means of communication realizes between chip CPU1 and chip CPU2, agreement (SPI) is set between, chip CPU2 can when back-up source state changes by (the charging of its operating state, electric discharge, electricity, whether there is the information such as Voltage Drop) send information in chip CPU1, show on LCD after chip CPU1 process again.In figure, COM is ipc monitor platform, comprises permanent magnet motor monitoring interface and back-up source observation interface.On permanent magnet synchronous motor monitoring interface, can real-time monitored to the motor running speed curve be sent to by chip CPU1, turn to, main circuit current curve, voltage curve, whether there is Voltage Drop etc., send control command in chip CPU1 by host computer simultaneously, thus control the rotating speed of motor operation and turn to; Back-up source monitoring platform can observe back-up source electricity, charging current, charging voltage etc.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (6)
1. there is a permanent magnet motor controller for voltage collapse protection, it is characterized in that: comprise three phase rectifier module (A), filter circuit (D), detecting voltage by three phase module (U), high frequency transformer (Y), voltage extraction circuit (G), current transformer (K1), signal conditioning circuit (K2), isolated drive circuit (O), fault detection module (L1), signal transacting isolation module (L), back-up source charge circuit (Z), back-up source voltage detecting circuit (Z2), isolated form line sampling circuit (Z3), optical couple isolation drive circuit (Z19), constant current charge loop (CC), charging current detecting circuit (A1), ipc monitor platform (COM), constant voltage charge loop (CV), inverter bridge protective circuit (M1), high frequency switch power (W), filter capacitor and equalizer circuit (F) thereof, soft starting circuit (B), indicating circuit (H), back-up source (X), braking circuit (I), relatively drive circuit (E), back-up source discharge circuit (N), first ON-OFF control circuit (T1), second switch control circuit (T2), first central control module (U1) and the second central control module (U2), the input of three-phase alternating voltage through output one tunnel of three phase rectifier module (A) as described high frequency switch power (W), this high frequency switch power (W) controls for motor frequency change and the realization of Voltage Drop protection is powered, and the one end on another road is connected with the input of described soft starting circuit (B), the output of this soft starting circuit and described voltage signal detection module (U) three-phase alternating voltage is scaled after be input in the second central control module (U2), one output of described second central control module (U2) is connected with described back-up source charge circuit (Z), output one tunnel first ON-OFF control circuit (T1) of described back-up source charge circuit (Z) is connected with described constant current charge loop (CC), and another road is connected with described constant voltage charge loop (CV) through second switch control circuit (T2), the positive pole of described back-up source (X) is connected with the output of described constant voltage charge loop (CV), described back-up source voltage detecting circuit (Z2) is connected with described isolated form line sampling circuit (Z3), and the magnitude of voltage of back-up source of sampling (X) feeds back to described second central control module (U2), the positive pole of described back-up source (X) is connected with the first switching tube (Z14), and the emitter of the first switching tube (Z14) is connected with back-up source discharge circuit (N), described back-up source discharge loop (N) output head anode is connected with soft starting circuit (B) output head anode, and back-up source (X) negative pole is connected with the negative output terminal of three phase rectifier modules A, shunt-wound capacitance device group and equalizer circuit (F), voltage extraction circuit (G), indicating circuit (H), braking circuit (I), inverter (M) between described soft starting circuit (B) output head anode and three phase rectifier module (A) negative pole of output end, output one tunnel of described voltage extraction circuit (G) is compared through signal and is connected with described soft starting circuit (B) control end with isolated drive circuit (C), and another road is connected with the control end of described braking circuit (I) through comparing drive circuit (E), described the first central control module (U1) gathers the rotating speed of bus current value, motor three-phase current and motor rotation by current transformer (J1, K1) and position detecting module (EN), this first central control module (U1) is also connected with host computer (COM) and isolated drive circuit (O), and with the communication of described second central control module (U2), described isolated drive circuit (O) is connected with described inverter (M).
2. the permanent magnet motor controller with voltage collapse protection according to claim 1, is characterized in that: described high frequency switch power (W) comprises a filter circuit (D), high frequency transformer (Y), switching power source chip (S), MOSFET pipe (Q), feedback circuit (T), over-voltage and over-current testing circuit (R3), current-limiting circuit (R1) and transient suppressor (R2); Described filter circuit (D) converts the direct voltage of the pulsation that three phase rectifier module (A) two ends described in claim 1 export to comparatively galvanic current pressure, its positive pole is connected to the different name end of high frequency transformer (Y) armature winding, and the source electrode of described switching power source chip (S) is connected to the Same Name of Ends of high frequency transformer (Y) armature winding; Drain electrode end series connection MOSFET pipe (Q) of described switching power source chip (S); When the metal-oxide-semiconductor conducting that switching power source chip (S) is built-in, the source voltage of MOSFET pipe (Q) is low level, makes MOSFET manage (Q) conducting; When the metal-oxide-semiconductor cut-off that switching power source chip (S) is built-in, MOSFET pipe (Q) cut-off; Current-limiting circuit (R1), plays metering function; Transient suppressor (R2), the upper dividing potential drop amount of restriction MOSFET pipe (Q) is lower than its withstand voltage; Described signal deteching circuit (R3) detects the voltage that three phase rectifier module (D) exports; The input of described high frequency transformer (Y) is provided with clamp circuit (P); Described feedback circuit (T) feeds back the duty ratio that whether normal the secondary output voltage of described high frequency transformer (Y) thus by-pass cock power supply chip (S) work.
3. the permanent magnet motor controller with voltage collapse protection according to claim 1, is characterized in that: described the first central control module (U1) comprises a central processing element (CPU1) and the LCD be connected with this central processing element, key circuit (KB).
4. the permanent magnet motor controller with voltage collapse protection according to claim 1, it is characterized in that: described soft starting circuit (B) is managed (B1), current limliting module (B3) and the first protective circuit (B2) by IGBT and formed, one output of (B1) is managed in one end of described current limliting module (B3) collector electrode and three phase rectifier module (A) with described IGBT is connected, and the input of the other end manages (B1) emitter and the first protective circuit (B2) with described IGBT is connected; The output of described protective circuit (B2) is as the output of described soft starting circuit; Described signal compares the grid of managing (B1) with the output of isolated drive circuit (C) with described IGBT and is connected.
5. the permanent magnet motor controller with voltage collapse protection according to claim 1; it is characterized in that: described back-up source (X) by after multiple super capacitor is connected again parallel connection form, and this back-up source (X) is also provided with and all presses flow equalizing circuit (Y).
6. the permanent magnet motor controller with voltage collapse protection according to claim 1, is characterized in that: described back-up source charge circuit (Z) comprises protective circuit (Z12), isolated drive circuit (Z13), switching tube (Z9), accumulator (Z10), freewheeling circuit (Z11); The drive singal (l) that described second central control module (U2) exports works through isolation drive protective circuit (Z13, Z12) trigger switch pipe (Z9), to reduce the charging voltage of back-up source;
Described back-up source discharge loop (N) comprises protective circuit (Z18), the first isolated drive circuit (Z15), the second isolated drive circuit (Z19), the first switching tube (Z14), second switch pipe (Z17), accumulator (Z16), freewheeling circuit (Z20); Described second central control module (U2) output drive signal (p) triggers the first switching tube (Z14) work through isolated drive circuit (Z15), is energized to discharge loop; Described second central control module (U2) output drive signal (i) triggers second switch pipe (Z17) work through isolation drive and protective circuit (Z18, Z19), powers to main circuit to promote back-up source voltage
.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310162108.6A CN103227598B (en) | 2013-05-06 | 2013-05-06 | Permanent magnet motor controller with voltage dip protection function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310162108.6A CN103227598B (en) | 2013-05-06 | 2013-05-06 | Permanent magnet motor controller with voltage dip protection function |
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| CN103227598B true CN103227598B (en) | 2015-04-15 |
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| CN103956952B (en) * | 2013-04-17 | 2017-10-13 | 济南亚特伦特机械科技有限公司 | Synchronous frequency conversion formula alternating current generator vector frequency conversion control device |
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|---|---|---|---|---|
| US4588933A (en) * | 1984-09-13 | 1986-05-13 | Motorola, Inc. | Brushless direct current motor control system with protection circuitry |
| CN101976880A (en) * | 2010-11-11 | 2011-02-16 | 福州大学 | Intelligent device for voltage dip protection |
| CN102291085A (en) * | 2011-08-23 | 2011-12-21 | 东北电网有限公司 | Asynchronous motor frequency converter device with low-voltage ride through capability |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA813797B (en) * | 1980-06-10 | 1982-06-30 | Thorn Domestic Appliances Ltd | Motor speed control system |
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2013
- 2013-05-06 CN CN201310162108.6A patent/CN103227598B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4588933A (en) * | 1984-09-13 | 1986-05-13 | Motorola, Inc. | Brushless direct current motor control system with protection circuitry |
| CN101976880A (en) * | 2010-11-11 | 2011-02-16 | 福州大学 | Intelligent device for voltage dip protection |
| CN102291085A (en) * | 2011-08-23 | 2011-12-21 | 东北电网有限公司 | Asynchronous motor frequency converter device with low-voltage ride through capability |
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| digital analysis and development of ride-through capability of ac contactor with respect to voltage sag characteristics;Ismail,N.A et al.;《The 2nd IEEE International Conference on Computer and Automation Engineering》;20101231;第5卷;全文 * |
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