CN101295933A - Frequency conversion power source based on digital signal processor controlling - Google Patents

Frequency conversion power source based on digital signal processor controlling Download PDF

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Publication number
CN101295933A
CN101295933A CNA2007100986928A CN200710098692A CN101295933A CN 101295933 A CN101295933 A CN 101295933A CN A2007100986928 A CNA2007100986928 A CN A2007100986928A CN 200710098692 A CN200710098692 A CN 200710098692A CN 101295933 A CN101295933 A CN 101295933A
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China
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circuit
voltage
power supply
signal
pulse
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CNA2007100986928A
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Chinese (zh)
Inventor
郑军
王云宽
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中国科学院自动化研究所
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Priority to CNA2007100986928A priority Critical patent/CN101295933A/en
Publication of CN101295933A publication Critical patent/CN101295933A/en

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Abstract

The invention relates to a variable-frequency power source based on the control of a digital signal processor, which comprises a switch power source module, a control circuit, a circuit for isolating and shaping pulse-width modulating signal, IPM inverting circuits, a circuit for detecting and protecting busbar voltage, a rectification input slow-start circuit, a communication circuit, an interface circuit for isolating and inputting parallel signals and an human-computer interface circuit for displaying the key. The invention adopts the structure of a single digital signal processor (DSP) coupled with the double IPM inverting circuits, provides two paths of independent variable-frequency power sources for two sets of asynchronous motors at the same time and carries out independent speed regulations to the two sets of asynchronous motors. The variable-frequency power source of the invention has the advantages of small volume, low power consumption, high reliability and being convenient for bulk production, etc., and adopts an appropriate switch frequency and an advanced voltage space vector pulse width modulation algorithm (SVPWM), thereby lowering the noise during the operation of the asynchronous motors and increasing the voltage utilization rate, with obvious effect on energy saving.

Description

A kind of variable frequency power supply based on DSP CONTROL

Technical field

The present invention relates to variable frequency power supply, relate to a kind of variable frequency power supply especially based on DSP CONTROL.

Background technology

Weft accumulator is the special equipment of deposit weft yarn on the shuttleless loom, adopts Induction Motor-Driven mostly, and according to the process characteristic of two spray weft accumulators, its variable frequency power supply must satisfy following specification requirement: energy is the speed of independent regulation two asynchronous motors simultaneously; Can control the asynchronous machine lifting speed time by switching value; Volume is little, low in energy consumption; Little, the good energy-conserving effect of noise; The reliability height; Cost is low, is suitable for producing in batches.

Adopt universal frequency converter to have following shortcoming as the variable frequency power supply of weft accumulator:

Though 1, every frequency converter can be controlled two asynchronous motors simultaneously, speed that can not each asynchronous machine of independent regulation, each asynchronous machine can only be operated in same rotating speed;

2, the interface of universal frequency converter is single, can not control the asynchronous machine lifting speed time by switching value;

3, volume is big, and noise is big;

4, if want the speed of independent regulation two asynchronous motors simultaneously, must dispose two frequency converters, cost increases, and reliability is low.

Be not difficult to find out by above analysis, adopt universal frequency converter to be difficult to satisfy above-mentioned requirements as the variable frequency power supply of weft accumulator.

Control circuit is the core of whole special-purpose variable frequency power supply design, and its major function is to produce three-phase six road pulse-width signals, controls the running status of asynchronous machine simultaneously according to the input state of switching value.In common transducer control circuit design, more employing single-chip microcomputer or special integrated chip (as HEF4752, SLE480 etc.) make hardware circuit comparatively complicated like this, are difficult to satisfy the little and low requirement of cost of weft accumulator special converter volume.And said chip only has the output of 6 road pulse-width signals, can not satisfy the requirements of 12 road required pulse-width signals of two spray weft accumulator two-way power supplys simultaneously.

The discrete power switch elements that adopt in the common frequency converter make drive circuit and protective circuit complexity more, cause the shortcoming of frequency converter stability and poor reliability.This variable frequency power supply has adopted the main power device of the very high Intelligent Power Module IPM of cost performance as inverter circuit; simplified the design of drive circuit; dwindled the circuit volume, and made full use of that the integrated protected location of Intelligent Power Module IPM has been realized fast, reliable protection.

Summary of the invention

For the weft accumulator special converter that solves prior art can not each asynchronous machine of independent regulation speed, each asynchronous machine can only be operated in same rotating speed; Can not control the asynchronous machine lifting speed time by switching value; Hardware circuit is comparatively complicated, is difficult to satisfy that the little and cost of weft accumulator special converter volume is low requires and noise is big, stability and poor reliability; If want the speed of independent regulation two asynchronous motors simultaneously; cost increases; reliability low etc. a series of problems; for this reason; the purpose of this invention is to provide the design that has bigger program's memory space and abundant peripheral hardware resource, only needs a small amount of peripheral circuit, simplified driving circuit, dwindle the circuit volume, realize fast, the design of reliably protecting; for this reason, the invention provides a kind of variable frequency power supply based on DSP CONTROL.

To achieve these goals; the present invention adopts advanced microcontroller technology, pulse modulation technology and power electronic technology to combine; the technical scheme that provides based on the variable frequency power supply of DSP CONTROL; comprise: switch power module, control circuit, pulse-width signal are isolated shaping circuit, IPM inverter circuit, busbar voltage detection and protective circuit, rectification input slow start circuit, telecommunication circuit, parallel signal isolation input interface circuit and display button man-machine interface circuit, wherein:

One switch power module provides control voltage for control circuit and IPM inverter circuit;

One control circuit produces pulse-width signal, is used to control the output frequency and the voltage of IPM inverter circuit;

One pulse-width signal isolate shaping circuit to the pulse-width signal that control circuit produces isolate, shaping;

One IPM inverter circuit to pulse-width signal isolate that shaping circuit is isolated, pulse-width signal after the shaping carries out power amplification and inversion, produces two independent frequency conversion three phase mains, is used to drive asynchronous machine (M);

One busbar voltage detects and protective circuit, is used to realize the overvoltage of power supply, under-voltage and overcurrent protection;

One rectification input slow start circuit is used for restriction start charging current, with protection rectifier bridge and filter capacitor;

One telecommunication circuit is real-time transmitted to the running state information of variable frequency power supply host computer and sends the instruction of host computer to variable frequency power supply by serial ports or CAN bus, realizes remote real-time monitoring;

One parallel Signal Spacing input interface circuit and display button man-machine interface circuit are used for the input of on-the-spot command signal and the demonstration of state information, realize local monitoring in real time.

According to embodiments of the invention, switch power module comprises power supply control chip, contains the high-frequency pulse transformer and the feedback loop of nine groups of secondary windings, utilize DC bus-bar voltage as input, export that seven tunnel+15V voltage offers the IPM inverter circuit, one tunnel+24V voltage offers external fan or relay, a tunnel+5V voltage offers control circuit.

According to embodiments of the invention, control circuit adopts digital signal processor DSP as CPU, the output frequency and the voltage of control IPM inverter circuit produce ten two road pulse-width signals after the Signal Spacing shaping circuit is isolated shaping, are used to drive the IPM inverter circuit.

According to embodiments of the invention, the pulse-width signal that control circuit produces adopts switching frequency and the space vector of voltage pulse width modulation algorithm of 16KHz.

According to embodiments of the invention, control circuit also has the jtag interface circuit, is used to realize the debugging and the upgrading of Control Software.

According to embodiments of the invention, described pulse-width signal is isolated shaping circuit and is adopted high speed photo coupling that pulse-width signal is isolated, and through inverter to pulse-width signal shaping rear drive IPM inverter circuit.

According to embodiments of the invention, the work of two-way IPM inverter circuit common DC bus.

According to embodiments of the invention; busbar voltage detection and protective circuit detect bus voltage value in real time by the busbar voltage testing circuit and compare with the setting threshold value; produce guard signal; again in conjunction with the over-current signal of IPM inverter circuit; deliver to control circuit together and carry out logical process, be used to protect IPM inverter circuit and asynchronous machine M.

According to embodiments of the invention, rectification input slow start circuit is realized starting slowly by being connected on the current-limiting resistance R18 on the dc bus and the normally opened contact J1-1 of delayed startup relay J 1.

According to embodiments of the invention, described telecommunication circuit communicates by RS-232 serial ports or CAN bus and host computer.

According to embodiments of the invention, parallel signal is isolated input interface circuit and is adopted the circuit of being made up of programmable logic device and buffer that the input port of control circuit is expanded, and through realizing the isolation input of multidiameter delay switching value signal after the light-coupled isolation, the switching value signal of input comprises speed command, lifting speed time and other control command switching value signals.

According to embodiments of the invention, display button man-machine interface circuit adopts based on the chip of the serial SPI communication mode managing chip as display button, adopts six charactrons as display device, and six press keys is as input.

Variable frequency power supply of the present invention has adopted Intelligent Power Module IPM as power component, has perfect defencive function.And Intelligent Power Module IPM is integrated in multi-channel driver circuit and IGBT power tube in the module, makes the reduction of design and debugging difficulty, shortened the design cycle, reduced cost.

In system of the present invention, adopt DSP as main control chip, made full use of the abundant interior peripheral hardware resource of sheet of DSP, reduced the quantity of peripheral circuit components and parts, make the design of control circuit more simple and reliable.Operation result shows that the dynamic characteristic of system is good for a long time, has the advantage that volume is little, cost is low simultaneously.

Protective circuits such as complete overvoltage, under-voltage, overcurrent that system of the present invention has adopted switch element such as relay and corresponding Logic Circuit Design; the system that makes can in time detect fault-signal and can in time cut off the output of system when abnormal conditions occurring, system is quit work be not damaged with guaranteed output device and asynchronous machine.The mode that this protective circuit has adopted hardware circuit and software control to combine is protected, and has simple, comprehensive, reliable advantage.The present invention can be used for the frequency control of various two spray weft accumulators, and other occasions that need carry out frequency control simultaneously to two asynchronous motors, also can be used as universal frequency converter and separately an asynchronous motors is carried out frequency control.

Description of drawings

Fig. 1 is a circuit structure The general frame of the present invention

Fig. 2 is switch power module circuit theory diagrams of the present invention

Fig. 3 is a control circuit schematic diagram of the present invention

Fig. 4 isolates the shaping circuit schematic diagram for pulse-width signal of the present invention

Fig. 5 is an IPM inverter circuit schematic diagram of the present invention

Fig. 6 detects and the protective circuit schematic diagram for busbar voltage of the present invention

Fig. 7 is rectification input slow start circuit schematic diagram of the present invention

Fig. 8 is communication module circuit theory diagrams of the present invention

Fig. 9 isolates the input interface circuit schematic diagram for parallel signal of the present invention

Figure 10 is display button man-machine interface circuit theory diagrams of the present invention

Embodiment

Below in conjunction with accompanying drawing the present invention is described in detail, be to be noted that described embodiment only is intended to be convenient to the understanding of the present invention, and it is not played any qualification effect.

The present invention can be used for the frequency control of various two spray weft accumulators, and other occasions that need carry out frequency control simultaneously to two asynchronous motors, also can be used as universal frequency converter and separately an asynchronous motors is carried out frequency control.

The present invention only enumerates the special-purpose variable frequency power supply embodiment of two spray weft accumulators that is used for based on DSP CONTROL, with reference to Fig. 1, is the circuit structure The general frame of the embodiment of the invention.It is isolated shaping circuit 3, IPM inverter circuit 4, busbar voltage detection and protective circuit 5, rectification input slow start circuit 6, telecommunication circuit 7, parallel signal isolation input interface circuit 8 and display button man-machine interface circuit 9 by switch power module 1, control circuit 2, pulse-width signal and forms.

The switch power module 1 of the present invention's design adopts the TOP224Y chip of POWER INTEGERATION company as main control chip U0, and designed high-frequency pulse transformer T and feedback loop with nine groups of secondary windings, the dc bus that utilizes capacitor C 0 two ends is as input voltage, principle according to single-end flyback switching power supply has produced nine tunnel control voltages of isolating mutually, seven tunnel+15V voltage V1 wherein, V2, V3, V4, V5, V6, V7 offers IPM inverter circuit 4,1 tunnel+24V voltage offers fan or relay, 1 tunnel+5V voltage VCC offers control circuit 2, its detail circuits principle is seen Fig. 2, owing to adopted integrated chip TOP224Y as control chip, make the structure of Switching Power Supply become simple and reliable, and dwindled volume greatly.Wherein the TOP224Y chip has three terminals: drain D, control end C, source S; its inner integrated pulse width modulator, power switch field effect transistor MOSFET, automatic bias circuit, protective circuit, high-voltage starting circuit and loop compensation circuit; by high frequency transformer output and electrical network are isolated fully; realized the integrated, safe and reliable of no industrial frequency transformer, isolation, inverse-excitation type switch power-supply.High-frequency pulse transformer T adopts the magnetic core of EI35, and operating frequency is 100KHz, has 10 windings, and wherein 1 is elementary winding, and 1 is the feedback winding, and 8 is secondary winding, and winding all uses the triple insulated wire coiling, has effectively reduced the volume of transformer.D3, D4 form clamp circuit among the figure, are used to absorb peak voltage; The circuit of being made up of R3, C3 between C, S terminal provides drive current for the door driving stage of TOP224Y inside; Feedback circuit has adopted the modified model feedback circuit of being made up of diode D1, voltage-stabiliser tube D2 and resistance R 1, has simplified circuit, has reduced cost; For power supply is worked more reliably, in feedback circuit, added the soft starting circuit of forming by R2 and C2 simultaneously.Ultrafast recovery diode D and capacitor C are formed current rectifying and wave filtering circuit, and each pulse voltage of exporting winding is converted to corresponding direct voltage.Its operation principle is: utilize the feedback current of feedback winding to regulate the output duty of ratio, reach the purpose of voltage stabilizing.For example raise when exceeding design voltage+15V when the voltage of feedback winding V7, the feedback current Ic that is obtained by feedback circuit will increase, the control end C of feedback current Ic by TOP224Y controls each winding output duty of ratio and reduces, thereby voltage is descended, finally make voltage maintain+15V is constant.Feedback winding V7 also exports winding for IPM inverter circuit 4 provides+15V voltage as one group simultaneously, has made full use of Transformer Winding, has saved cost.VCC and VCC2 two-way+5V voltage produce by the U1 voltage stabilizing, and VCC1 voltage is produced by the U2 voltage stabilizing, as the power supply of DSP, greatly reduces the ripple of output voltage, has reduced the interference of Switching Power Supply to control circuit.Wherein U1 has adopted LM7805 voltage stabilizing chip, and U2 has adopted LM1117 voltage stabilizing chip.This switch power module has the input voltage range of broad, but exchanges all operate as normal of input 150V-265V, and power output can reach 50W.

In Fig. 1, control circuit 2 adopts the special-purpose integrated DSP chip of Digital Signal Processing TMS320LF2407 as CPU, output frequency and voltage according to parallel input signal control IPM inverter circuit 4, make full use of its hardware resource, can produce 12 road pulse-width signal PWM simultaneously, isolate through the pulsewidth modulation signal and be used to drive IPM inverter circuit 4 after shaping circuit 3 is isolated shaping, because DSP has abundant peripheral hardware resource, make that the design of circuit is simple relatively, move more reliably that cost reduces.TMS320LF2407 is 16 fixed DSPs of a kind of high-performance that TIX produces.Fixed-point calculation speed can reach 30,000,000 instructions of per second, has stronger operational capability and quick processing capability in real time.TMS320LF2407 is a kind of motor special control dsp chip, taken into full account and optimized the required hardware configuration of Electric Machine Control, being particularly suitable for the high performance control of threephase asynchronous, having characteristics such as flexibility and reliability, cost be low, is the upgrading products of motor Digital Control.Two task manager modules have two general purpose timers, three comparing units and the output of six road pulse-width signals respectively, are applicable to control asynchronous machine and inverter, and can control two asynchronous motors simultaneously.

Utilize the task manager module of TMS320LF2407 can adjust the switching frequency of pulse-width signal easily, and can realize space vector of voltage pulse-width modulation (SVPWM) algorithm easily.The switching frequency that the present invention designs pulse-width signal PWM is 16KHz, and has adopted the space vector of voltage pulse width modulation algorithm, effectively reduced weft accumulator noise, improved the operational efficiency of weft accumulator.Space vector of voltage pulse width modulation algorithm (SVPWM) is the angle from motor, is conceived to make motor to obtain the circular magnetic field of constant amplitude, promptly sinusoidal magnetic flux.The circular ideal flux path of asynchronous machine was a benchmark when it was powered with three-phase symmetrical sine wave voltage, and the actual magnetic flux that produces with the different switching mode of inverter removes to approach benchmark magnetic flux circle, thereby reaches higher control performance.

As shown in Figure 3, DSP also has peripheral hardware resource in the abundant sheet: SPI interface (peripheral serial line interface) is a kind of four line locking serial line interfaces, can be connected with display button man-machine interface circuit 9 easily, carry out the exchanges data of full duplex with it according to the SPI standard time sequence, speed can reach several Mbps; The jtag interface circuit is the online programming interface of standard, can be connected with artificial debugging equipment easily, realizes the debugging and the upgrading of Control Software, need not the dismounting chip; The SCI interface is the asynchronous serial communication interface of standard, and terminal TX, RX just can communicate with host computer serial ports such as industrial computers by a level transferring chip, and communication protocol adopts industrial general MODBUS agreement.The CAN bus is a kind of serial communication bus of many master modes, is one of most widely used fieldbus in the world, has lower cost and high total line use ratio.CAN Interface Terminal CANTX, CANRX communicate by level transferring chip and host computer, greatly facilitate hardware designs and software programming.Because the integrated communication mode of these two kinds of industrial extensive uses makes system widely applicable, convenient, flexible; DSP also has a large amount of input/output ports, can realize the input of the delay control signal DELAY of rectification input slow start circuit 6 and various guard signal OV, LV, OC.Can also expand input port by data/address bus, realize the input of a large amount of parallel switching value signals.

As shown in Figure 4, isolate a road in the shaping circuit 3, have 12 the tunnel for pulse-width signal of the present invention.12 road pulse-width signal PWM that control circuit 2 produces isolate through high speed photo coupling U3 earlier, through inverter U4 signal is carried out being input to respectively in the two-way IPM module after the anti-phase shaping again, reduced the interference of power circuit, damaged control circuit when having avoided the power circuit fault control circuit.High speed photo coupling U3 adopts HCPL4504, this is the special-purpose optocoupler of IPM interface of a kind of high speed, high common mode ratio, its extremely short parasitism time-delay has been guaranteed safety for the Dead Time of the speed-sensitive switch in the IPM application, simultaneously also reduced the interference of power circuit, damaged control circuit when having avoided the power circuit fault control circuit.What inverter U4 adopted is the 74HC14 chip.Power supply VCC3 wherein (+3.3V) detect by busbar voltage and protective circuit 5 controls, in order to turn-off pulse-width signal when the over current fault, realize hardware protection.R4 is the current-limiting resistance of optocoupler input, and optocoupler output is moved on resistance R 5+5V (VCC2), carries out shaping through inverter 74HC14 then, makes the rising edge and the trailing edge of isolating the pulse-width signal PWM1 waveform after the shaping more precipitous.

As shown in Figure 5, the pulse-width signal PWM1 after 4 pairs of isolation of IPM inverter circuit, the shaping carries out power amplification and inversion, produces two independent frequency conversion three phase mains, is used to drive two asynchronous motors.Intelligent Power Module IPM in the IPM inverter circuit 4 adopts the PS21564 module of Mitsubishi.This Intelligent Power Module IPM adopts the 5th generation low-power consumption IGBT technology; gate driving after the built-in optimization and short-circuit protection, driving voltage under-voltage protecting circuit; with microminiature volume and integrated protective circuit; make the design and the debugging difficulty of circuit reduce; cost descends, and driving power all adopts insulating power supply, and is more reliable compared with the bootstrapping charge pump circuit; make two-way IPM inverter circuit 4 when common bus is worked, avoid interfering with each other, increased the reliability of system.The withstand voltage 600V of this module, maximum current 15A, the highest switching frequency can reach 20KHz.IPM is very high to the requirement of control power supply, and spoilage is more than the several times of other reasons, and traditional bootstrapping charge pump mode is because the difference of each element and charging interval must constantly test with capacitance-resistance function, so reliability is poor.As shown in Figure 5, in the present embodiment, the control power supply of every road IPM module all adopts isolation+15V voltage V1, V2, V3, V4, V5, V6, the V7 by switch power module 1 output, has guaranteed the reliable and stable of drive circuit.Pulse-width signal PWM1 inversion after Intelligent Power Module IPM power amplification after the isolation shaping is that the three-phase sine-wave of frequency adjustable is given asynchronous machine M power supply.The dc bus at the shared capacitor C of two-way Intelligent Power Module IPM 0 two ends is as input voltage among the figure, the resistance R between N terminal and the ground sBe the overcurrent sampling resistor, be used to gather current signal, resistance R SfAnd capacitor C SfForm filter circuit, current sampling signal is done the CIN terminal that is input to PS21564 after the Filtering Processing.FO is over-current signal output.Capacitor C between CFO terminal and the ground FOBe used to be provided with the output pulse width of over-current signal.

As shown in Figure 6; for busbar voltage of the present invention detects and protective circuit 5 schematic diagrams; comprise Fig. 6-A and Fig. 6-B two parts composition; busbar voltage detection and protective circuit 5 detect bus voltage value in real time by the busbar voltage testing circuit and compare with the setting threshold value; produce guard signal; in conjunction with the over-current signal and the heat alarm of two-way IPM inverter circuit, deliver to control circuit 2 together and carry out the protection that logical process is used for variable frequency power supply again.The existing hardware protection of this protective circuit has software protection again, can protect variable frequency power supply itself and asynchronous machine simultaneously.As Fig. 6-A; form differential amplifier circuit by operational amplifier U4 and resistance R 6, R7, R8, R9; gather the DC bus-bar voltage signal at capacitor C 0 two ends; capacitor C 6, C7 carry out filtering to signal; then by resistance R 10 inputs; compare with overvoltage, under-voltage threshold voltage respectively, produce corresponding overvoltage, under-voltage protection signal OV, LV input to DSP and carry out logical process, realize software protection.Wherein operational amplifier U4 adopts TL272; comparator U5 adopts its course of work of LM393 to be: when the DC bus-bar voltage of gathering is between overvoltage threshold voltage and under-voltage threshold voltage; OV, LV all export high level; when DC bus-bar voltage is higher than the overvoltage threshold voltage; the overvoltage protection signal of OV output low level is given DSP; when DC bus-bar voltage was lower than under-voltage threshold voltage, the under-voltage protection signal of LV output low level was given DSP.Wherein overvoltage, under-voltage threshold voltage can be adjusted by potentiometer R11, R12 respectively according to actual needs.As Fig. 6-B, believe that by the overcurrent that Intelligent Power Module IPM produces FO is after optocoupler U6 isolates, by drawing signal on the resistance R 14 into 3.3V, being input to D flip-flop U7 through resistance R 15 then latchs, produce two opposite overcurrent protection signals of phase place, wherein the signal OC of Q terminal inputs to DSP and carries out logical process, realizes software protection; The signal of Q terminal inputs to the base stage of triode N1 by resistance R 16, forms hardware protection circuit with resistance R 17 and triode N1 and is used to cut off pulse-width signal PWM1, makes IPM stop output.Wherein optocoupler U6 adopts the TLP521 chip, and D flip-flop U7 adopts the 74HC74 chip.Its course of work is: when normally moving, Q terminal output low level, triode N1 conducting, 3.3V the power supply of the optocoupler U3 among power supply VCC3 bio-occlusion Fig. 4, when Intelligent Power Module IPM produces over-current signal, U6 output low level signal, input end of clock at 74HC74 produces a trailing edge, make Q terminal output high level, this moment, triode N1 ended, 3.3V power supply VCC1 can not give the optocoupler U3 among Fig. 4 power supply, makes the pulse-width signal PWM1 that is input to IPM be low level, forces to stop the output of Intelligent Power Module IPM.Above hardware protection and software protection combine, and have realized, reliable protection comprehensive to variable frequency power supply itself and asynchronous machine.

As shown in Figure 7, for rectification input slow start circuit 6 schematic diagrams of the present invention, comprise two parts composition diagram 7-A Fig. 7-B.Rectification input slow start circuit 6 is realized starting slowly by being connected on the current-limiting resistance R18 on the dc bus and the normally opened contact J1-1 of delayed startup relay J 1.As Fig. 7-A, when variable frequency power supply is started shooting, at first give filter capacitor C0 charging by resistance R 18, as Fig. 7-B, this moment, delay control signal DELAY was a low level, triode N2 ends, and relay J 1 coil can not get electric, and normally opened contact J1-1 opens, Deng the time-delay a period of time after (about 3 seconds), electric capacity charges substantially and finishes, and at this moment makes delay control signal DELAY become high level by DSP again, makes triode N2 conducting, this moment, relay J 1 coil got, normally opened contact J1-1 adhesive with resistance R 18 short circuits, directly is that capacitor C 0 continues charging by normally opened contact.Adopt this circuit can reduce the start charging current effectively, to the impact of rectifier bridge and filter capacitor C0, prolong its useful life when reducing to start shooting, reduced the cost that variable frequency power supply is safeguarded.

As shown in Figure 8, be telecommunication circuit 7 schematic diagrams of the present invention.This circuit adopts level transferring chip U9 that SCI Interface Terminal TX, the RX of DSP are carried out level conversion, be connected to the RS-232 serial ports of host computer then, the MODBUS communication protocol and the host computer of employing standard communicate, and have versatility, can compatible various systems based on MODBUS communication protocol.What wherein level transferring chip U9 adopted is the MAX232 chip.Adopt level transferring chip U8 that CAN Interface Terminal CANTX, the CANRX of DSP are carried out level conversion, be connected to the CAN address card of host computer then, this circuit can provide differential transmission and the acceptance to the CAN bus, and communication media (bus) adopts the stronger twisted-pair feeder of antijamming capability, and highest communication speed can reach 1Mbps.What wherein level transferring chip U8 adopted is the PCA82C250 chip.By serial communication or CAN communication, can be online on the host computer (industrial computer or PC) show intermediate variable and important parameter that institute's weft accumulator that is useful on is controlled, make the running status of the monitoring weft accumulator that the operator can be real-time, and according to circumstances operate accordingly and control, realize remote real-time monitoring.Because the integrated communication mode of these two kinds of industrial extensive uses, the system that makes goes for different industrial environments, and is convenient, flexible.

As shown in Figure 9, isolate input interface circuit 8 schematic diagrams for parallel signal of the present invention.The outside parallel signal of multichannel is input among the DSP through the expansion input port through after the light-coupled isolation.Expansion input port circuit adopts based on the circuit of programmable logic device U10 and buffer U11 composition to be expanded the input port of control circuit 2, and parallel input signal comprises speed command, lifting speed time and other control command switching value signals.Wherein programmable logic device U10 adopts the GAL16V8 chip, and buffer U11 adopts the 74HC244 chip.Parallel input signal is through being input to the A terminal of U11 after the light-coupled isolation, optocoupler adopts the TLP121 of extra small encapsulation, dwindled volume greatly, because the control signal of industry spot mostly is the 24V level, and the level of DSP is 3.3V, therefore light-coupled isolation has not only guaranteed the isolation of electric signal but also has realized the conversion of level, make input interface more flexibly, reliable.U10 provides chip selection signal/CS for U11, because GAL16V8 is a kind of logic gate array (GAL) device, can dispose the address of expansion input port by it is programmed easily, when DSP will read the data of certain expansion address, input port, GAL16V8 will produce corresponding chip selection signal be input to 74HC244 /the CS terminal, the 74HC244 device of gating correspondence makes data be loaded on the data/address bus of DSP by the Y terminal of 74HC244, makes DSP receive corresponding data.

As shown in figure 10, be display button man-machine interface circuit 9 schematic diagrams of the present invention.This circuit adopts based on the interface chip U12 of serial SPI communication mode and has designed display button man-machine interface circuit as the managing chip of display button.The concrete model of interface chip U12 is CH452, and this is a kind of charactron display driver and keyboard scan control chip.CH452 onboard clock oscillating circuit can 8 charactrons of dynamic driving or 64 LED, have functions such as BCD decoding, flicker, displacement, section addressing, light beam decoding; Simultaneously can also carry out the keyboard scan of 64 keys.CH452 links to each other with the SPI interface (SPICLK, SPISI, SPISTE, SPISO) of DSP by 4 line serial SPI interfaces (DCLK, DIN, LOAD, DOUT), carries out the exchanges data of full duplex according to SPI sequential and DSP, and speed can reach several Mbps.The display part is made up of 6 charactrons, and button is 6 buttons, be respectively the operation key (RUN), stop/reset key (STOP), on/following key (▲/ ), functional mode switch key (MODE) and revise acknowledgement key (ENTER).This part circuit can provide the demonstration of state information and the input interface of command signal for the execute-in-place person, realize local monitoring in real time, compared with the display button management circuit that uses discrete device to form, this circuit can better be saved the space, reduce cost, and because the minimizing of element makes that the reliability of circuit is higher, many integrated functionalities of chip make the workload of software significantly reduce in addition.

The front has specifically described embodiment of the present invention, be to be understood that, for a people with the common skill in present technique field, under the situation that does not deviate from scope of the present invention, above-mentioned and in additional claim, change and adjust in the special scope of the present invention that proposes and to reach purpose of the present invention equally.

Claims (12)

1, a kind of variable frequency power supply based on DSP CONTROL; it is characterized in that: comprise that switch power module (1), control circuit (2), pulse-width signal are isolated shaping circuit (3), IPM inverter circuit (4), busbar voltage detects and protective circuit (5), rectification input slow start circuit (6), telecommunication circuit (7), parallel signal isolation input interface circuit (8) and display button man-machine interface circuit (9), wherein:
One switch power module (1) provides control voltage for control circuit (2) and IPM inverter circuit (4);
One control circuit (2) produces pulse-width signal, is used to control the output frequency and the voltage of IPM inverter circuit (4);
One pulse-width signal isolate shaping circuit (3) to the pulse-width signal that control circuit (2) produces isolate, shaping;
One IPM inverter circuit (4) to pulse-width signal isolate that shaping circuit (3) is isolated, pulse-width signal after the shaping carries out power amplification and inversion, produces two independent frequency conversion three phase mains, is used to drive asynchronous machine (M);
One busbar voltage detects and protective circuit (5), is used to realize the overvoltage of power supply, under-voltage and overcurrent protection;
One rectification input slow start circuit (6) is used for restriction start charging current, with protection rectifier bridge and filter capacitor (C0);
One telecommunication circuit (7) is real-time transmitted to the running state information of variable frequency power supply host computer and sends the instruction of host computer to variable frequency power supply by serial ports or CAN bus, realizes remote real-time monitoring;
One parallel Signal Spacing input interface circuit (8) and display button man-machine interface circuit (9) are used for the input of on-the-spot command signal and the demonstration of state information, realize local monitoring in real time.
2, variable frequency power supply according to claim 1, it is characterized in that: described switch power module (1) comprises power supply control chip, contains the high-frequency pulse transformer and the feedback loop of nine groups of secondary windings, utilize DC bus-bar voltage as input, export that seven tunnel+15V voltage offers IPM inverter circuit (4), one tunnel+24V voltage offers external fan or relay, a tunnel+5V voltage offers control circuit (2).
3, variable frequency power supply according to claim 1, it is characterized in that: described control circuit (2) adopts digital signal processor DSP as CPU, the output frequency and the voltage of control IPM inverter circuit (4), produce ten two road pulse-width signals after Signal Spacing shaping circuit (3) is isolated shaping, be used to drive IPM inverter circuit (4).
4, variable frequency power supply according to claim 1 is characterized in that: the pulse-width signal that described control circuit (2) produces adopts switching frequency and the space vector of voltage pulse width modulation algorithm of 16KHz.
5, variable frequency power supply according to claim 1 is characterized in that: described control circuit (2) also has the jtag interface circuit, is used to realize the debugging and the upgrading of Control Software.
6, variable frequency power supply according to claim 1 is characterized in that: described pulse-width signal is isolated shaping circuit (3) and is adopted high speed photo coupling that pulse-width signal is isolated, and through inverter to pulse-width signal shaping rear drive IPM inverter circuit (4).
7, variable frequency power supply according to claim 1 is characterized in that: the work of two-way IPM inverter circuit (4) common DC bus.
8, variable frequency power supply according to claim 1; it is characterized in that: described busbar voltage detection and protective circuit (5) detect bus voltage value in real time by the busbar voltage testing circuit and compare with the setting threshold value; produce guard signal; again in conjunction with the over-current signal of IPM inverter circuit (4); deliver to control circuit (2) together and carry out logical process, be used to protect IPM inverter circuit (4) and asynchronous machine M.
9, variable frequency power supply according to claim 1 is characterized in that: described rectification input slow start circuit (6) is realized startup slowly by being connected on the current-limiting resistance (R18) on the dc bus and the normally opened contact (J1-1) of delayed startup relay (J1).
10, variable frequency power supply according to claim 1 is characterized in that: described telecommunication circuit (7) communicates by RS-232 serial ports or CAN bus and host computer.
11, variable frequency power supply according to claim 1, it is characterized in that: described parallel signal is isolated input interface circuit (8) and is adopted the circuit of being made up of programmable logic device and buffer that the input port of control circuit (2) is expanded, and through realizing the isolation input of multidiameter delay switching value signal after the light-coupled isolation, the switching value signal of input comprises speed command, lifting speed time and other control command switching value signals.
12, variable frequency power supply according to claim 1, it is characterized in that: described display button man-machine interface circuit (9) adopts based on the chip of the serial SPI communication mode managing chip as display button, adopt six charactrons as display device, six press keys is as input.
CNA2007100986928A 2007-04-25 2007-04-25 Frequency conversion power source based on digital signal processor controlling CN101295933A (en)

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CN101841231A (en) * 2010-06-22 2010-09-22 华中科技大学 IP drive and protection method in motor control system
CN101977016A (en) * 2010-10-22 2011-02-16 天津理工大学 Singlechip-based induction motor variable frequency speed regulation control system
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CN102647095A (en) * 2011-02-17 2012-08-22 曲阜嘉信电气有限公司 Method for reducing voltage of direct-current bus of frequency changer
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CN104868822A (en) * 2015-05-29 2015-08-26 江苏海大印染机械有限公司 Preshrinking machine with Modbus frequency conversion speed regulation system
CN105508230A (en) * 2015-12-31 2016-04-20 深圳市英威腾电气股份有限公司 Air compressor variable-frequency driving and control AIO (All-In-One) machine and air compressor variable-frequency driving and control system
CN105896989A (en) * 2016-04-08 2016-08-24 昂宝电子(上海)有限公司 Flyback power supply system
CN106061085A (en) * 2016-08-15 2016-10-26 东文高压电源(天津)股份有限公司 High-precision isolated krypton lamp high-voltage power circuit with function of current adjustment
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CN101841231A (en) * 2010-06-22 2010-09-22 华中科技大学 IP drive and protection method in motor control system
CN102055464A (en) * 2010-10-14 2011-05-11 中国北车股份有限公司大连电力牵引研发中心 Velocity impulse processing circuit and operating method thereof
CN102055464B (en) * 2010-10-14 2012-09-05 中国北车股份有限公司大连电力牵引研发中心 Velocity impulse processing circuit
CN101977016A (en) * 2010-10-22 2011-02-16 天津理工大学 Singlechip-based induction motor variable frequency speed regulation control system
CN102647095A (en) * 2011-02-17 2012-08-22 曲阜嘉信电气有限公司 Method for reducing voltage of direct-current bus of frequency changer
US8966006B2 (en) 2011-03-08 2015-02-24 Lsis Co., Ltd. Data transfer apparatus and method
CN102737000A (en) * 2011-03-08 2012-10-17 Ls产电株式会社 Data transfer apparatus and method
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CN102694530A (en) * 2012-05-11 2012-09-26 蔡远文 Pulse signal test device of inertial platform for launch vehicle
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CN103326651A (en) * 2013-04-18 2013-09-25 江苏华骋科技有限公司 Alternating current motor control system based on vector control
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