CN2268341Y

CN2268341Y - Frequency-conversion speed regulator for motor

Info

Publication number: CN2268341Y
Application number: CN 96237325
Authority: CN
Inventors: 谭潮枝; 陈林康
Original assignee: JIANYE ELECTRIC-APPLIANCE EQUIPMENT FACTORY JUNAN TOWN SHUNDE CITY
Current assignee: JIANYE ELECTRIC-APPLIANCE EQUIPMENT FACTORY JUNAN TOWN SHUNDE CITY
Priority date: 1996-08-12
Filing date: 1996-08-12
Publication date: 1997-11-19
Anticipated expiration: 2006-08-12

Abstract

The utility model relates to a frequency-conversion speed regulator for a motor, which belongs to the technical field of speed regulation of a motor and comprises a rectification circuit, an inverter circuit, a voltage-stabilizing direct-current power supply, a microcomputer control circuit and a power interface circuit. An intelligent power module (IPM) which is integrated into a whole body by a drive circuit and an insulated-gate bipolar transistor is used as a power switch element of the inverter circuit; a single-chip microcomputer and the PWM special purpose chip are combined to generate SPWM signals. The utility model can enhance the reliability of frequency converters, can solve the problems of the existing frequency-conversion speed regulator for a motor with low reliability and high outside influences, can reduce the noise and the consumption of the motor; can enhance service life remarkably and can save electrical energy.

Description

The motor variable-frequency speed-regulating device

The utility model relates to a kind of motor variable-frequency speed-regulating device, it belongs to the electric machine speed regulation technical field, and it comprises microcomputer control circuit and the drive circuit that inverter circuit that rectification circuit and power end link to each other with this rectification circuit output end and constant voltage dc source and power end link to each other with the direct current of voltage regulation source output terminal.

At present, the motor variable-frequency speed-regulating device of domestic production, great majority are to adopt the power switch component of ambipolar high-power product body pipe BJT as inverter circuit in the frequency converter, because BJT is a current controling element, required base drive electric current is big, makes the drive circuit power consumption of frequency converter big, fragile; Its switching frequency is low, the carrier frequency of this kind frequency converter pwm voltage output is restricted, cause the stability of frequency converter relatively poor, reliability is relatively poor, causes problems such as the noise of motor height, the loss that utilize frequency converter timing are big, efficient is low, the life-span is short thus.

Chinese patent discloses a kind of motor frequency conversion device for No. 93229285.2, it comprises rectification circuit, constant voltage dc source, inverter circuit, microcomputer control circuit and drive circuit, and use the IGBT module as inverse switch element, EXB840 integrated thick-film circuit as drive circuit, though improved performance, but because power switch component IGBT external application drive circuit EXB840 drives, and since circuit parameter difficulty be controlled at the optimal parameter state, thereby still exist reliability not too high, be subject to the problem of ectocine.

The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art and a kind of drive circuit that need not to add is provided, and uses single chip microcomputer and dedicated PWM chip to produce the SPWM signal, improves the motor variable-frequency speed-regulating device of self reliability.

The purpose of this utility model is achieved in that microcomputer control circuit and the drive circuit that inverter circuit that it comprises that rectification circuit and power end link to each other with this rectification circuit output end and constant voltage dc source and power end link to each other with the direct current of voltage regulation source output terminal, the power interface circuit that links to each other with the direct current of voltage regulation source output terminal through power end of microcomputer control circuit wherein, link to each other with the input control end of inverter circuit through drive circuit again, by drive circuit, with the integrated Intelligent Power Module (IPM) of insulated gate bipolar transistor (IGBT) as the inverter circuit power switch component.

The utility model is because of adopting its defencive function of Intelligent Power Module (IPM) strong, and itself has drive circuit again, so simple in structure, volume is less, is not subject to ectocine; Module parameter in manufacture process has been the optimal parameter state, thus the reliability height, and use single chip microcomputer and dedicated PWM integrated chip to combine to produce the SPWM signal, further improve the reliability of frequency converter, greatly reduce noise of motor and loss, significantly improve useful life, saves energy.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is a housing outline drawing of the present utility model;

Fig. 2 is the utility model circuit block diagram;

Fig. 3 is the utility model main circuit schematic diagram;

Fig. 4 is the utility model microcomputer control circuit schematic diagram;

Fig. 5 is the utility model power interface circuit theory diagrams;

Fig. 6 is the utility model constant voltage dc source schematic diagram;

By accompanying drawing as can be known, the front side of housing 1 is provided with running switch 3 and the charging indicator light 6 and the malfunction indicator lamp 7 of the charactron 4 (LED1, LED2, LED3) that shows output frequency, the fm dial 5 that is used to set output frequency, control frequency output; The rear side of housing 1 is provided with lead-out terminal 8 (U, V, W) and the power input terminal 9 (R, S, T) that connects motor; Be equipped with rectification circuit A on housing 1 inner frame 2, constant voltage dc source B, microcomputer control circuit C, power interface circuit D and include drive circuit, and the IPM Intelligent Power Module E of IGBT inverter circuit, wherein rectification circuit A is made of diode rectification module DM and filter circuit, filter circuit is by capacitor C 1, be connected to rectification circuit A output and resistance R 1 after the C2 series connection, be connected to rectification circuit A output after the R2 series connection and with C1, tie point M and the R1 of C2, the tie point N of R2 links to each other and constitutes, and rectification circuit A from power input R, S, the three-phase alternating current electric rectification of T also is filtered into direct current stably, E provides power supply energy for intelligent object; Constant voltage dc source B is mainly by transformer T, five rectifier bridge BR, four three-terminal voltage-stabilizing chips 7815,1 three-terminal voltage-stabilizing chip 7805 and electric capacity constitute, it has the output of five road power supplys, transformer T will be from power input R, the alternating current step-down of T, become the alternating current of output four road 18V and one road 9V, after five rectifier bridge BR rectification, again through four three-terminal voltage-stabilizing chips 7815 and three-terminal voltage-stabilizing chip 7805 and capacitor filtering, export the constant voltage dc source of four tunnel+15V and a tunnel+5V, + 5V voltage provides working power for microcomputer control circuit C, and four tunnel+15V voltage provides working power for interface circuit D and Intelligent Power Module E; Microcomputer control circuit C mainly shows that by single chip microcomputer UPD78C10, buffer 74LS373, memory under program EPROM27C64, programmable timer 8254, pulse width signal generator HEF4752 and frequency charactron LED1, LED2, LED3 constitute; Single chip microcomputer UPD78C10 reads software program by buffer 74LS373 from memory under program EPROM27C64, and the state of judgement running switch 3 and fm dial 5, if there is CRANK PULSES, then by digital display tube LED1, LED2, LED3 shows output frequency, the programmable timer of single chip microcomputer UPD78C10 control simultaneously 8254 produces the required square-wave pulse frequency of pulse width signal generator HEF4752, make pulse width signal generator HEF4752 produce six road sinusoidal pulsewidth waveform signals, respectively from six output control terminal ORM1, ORM2, OYM1, OYM2, OBM1, OBM2 delivers to input T1～T6 of power interface circuit D; Power interface circuit D is made of photoelectrical coupler P521, after input signal is isolated, exports Intelligent Power Module E to; Intelligent Power Module E is the IPM module, include drive circuit and IGBT power component, drive circuit amplifies rear drive IGBT inverter circuit with input signal, the direct voltage of rectification circuit A output inserts P, the N end of intelligent object E, make the output of IGBT inverter circuit U, V, W three phase sine pulse width modulation voltage waveform, U, V, W output are linked to each other with the power end of motor, and U, V, W three phase sine pulse modulation voltage drive motor rotation, guarantee that motor rotation is functional.

Claims

1, a kind of motor variable-frequency speed-regulating device, it comprises microcomputer control circuit and the drive circuit that inverter circuit that rectification circuit and power end link to each other with this rectification circuit output end and constant voltage dc source and power end link to each other with the direct current of voltage regulation source output terminal, it is characterized in that the power interface circuit that microcomputer control circuit links to each other with the direct current of voltage regulation source output terminal through power end, link to each other with the input control end of inverter circuit through drive circuit again, by the integrated Intelligent Power Module (IPM) of drive circuit and insulated gate bipolar transistor (1GBT) as the inverter circuit power switch component.