CN2184902Y

CN2184902Y - Controller for refrigerating compressor

Info

Publication number: CN2184902Y
Application number: CN 93241362
Authority: CN
Inventors: 万振坤
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-10-09
Filing date: 1993-10-09
Publication date: 1994-12-07
Anticipated expiration: 2003-10-09

Abstract

The utility model relates to a controller for refrigerating compressors, which is composed of an overvoltage and undervoltage protection circuit, a delay time control circuit, an electronic switching circuit of photocoupling passed zero triggering, an electric circuit of a precise reference voltage source, and an electric source rectification circuit, wherein the delay time control circuit is composed of an operational amplifier ICE, a voltage comparator ICD, a transistor BG, a capacitor CT, resistors R17, R18, R19, R20, R21, R22, R23, R24, R25, RT, and a diode VD9, and the electronic switching circuit of photocoupling passed zero triggering is composed of a triggering element ICT of photocoupling passed zero, resistors R26, R27, R28, a capacitor C5, a light emitting diode VD11 and bidirectional controlled silicon VS.

Description

Controller for refrigerating compressor

The utility model relates to the safe operation resist technology of refrigeration compressor, promptly relates to a kind of refrigerant compression machine controller that can be applicable to refrigeration compressor safe operation protection.

Traditional refrigeration compressor running protection technology is generally overcurrent protection; and require refrigeration compressor motor under underloading, to start; for the sake of security; all indicate as refrigerator, air-conditioner being equipped with on the equipment of refrigeration compressor: this product is in operation if the outage phenomenon takes place, and must can reclose power supply more than 3 minutes in the interval.Refrigeration compressor starts as if horse back after power failure; because of the compressor inner high voltage does not discharge as yet fully; at this moment this compressor electric motor just starts under heavy duty; the operating current of motor will exceed the several times of normal starting current, and the overcurrent protection relay that is connected in the circuit is tripping, but resets soon; as still not starting just tripping again of motor; go down for a long time just easily to cause damage mechanically on the compressor electrical equipment, shorten compressor service life, the serious motor that promptly causes burns out.In addition, power supply fluctuation is a major reason that causes the refrigeration compressor damage, damages, i.e. compressor operation under under-voltage, overpressure situation starts, especially heavy load starting.Above-mentioned situation caused the damage of refrigeration compressor quite a lot, then the product that addresses these problems has just appearred, as refrigerator protector etc.Using as these devices such as refrigerator protectors to avoid compressor to start under mistake, undervoltage condition; and the delayed startup function is arranged; solved problem to a certain extent; but part also comes with some shortcomings: control and time delay generally adopts RC to discharge and recharge the trigger switch circuit, use charging capacitor to need bigger capacity, and big capacity electrolytic capacitor electric leakage is big; life-span is short; instability, volume are also big, are difficult for making the product miniaturization.The employed switching device of control device generally is common reverse-blocking tetrode thyristor circuit in addition, there is phase conduction angle, the ghyristor circuit of working under the phase place conduction mode can produce a large amount of abundant harmonic waves, can disturb the operate as normal of electronics, instrument and equipment, forms so-called power supply " pollution ".

The purpose of this utility model is exactly to overcome the weak point of existing refrigerant compression protector and a kind of working stability is provided, and volume is little, the reliability height, and do not cause the refrigerant compression machine controller of power supply " pollution ".

The purpose of this utility model realizes by following measure: delay control circuit (2) is by operational amplifier ICE, voltage comparator ic D, transistor BG, capacitor C T, resistance R 17, R18, R19, R20, R21, R22, R23, R24, R25, RT, diode VD9 forms, the in-phase input end of operational amplifier ICE meets delay adjustments device capacitor CT, resistance R T, the end of R11, another termination power cathode of capacitor C T, one end of the inverting input of operational amplifier ICE and output and resistance R 18, the in-phase input end of voltage comparator ic D connects, the end of the other end connecting resistance R17 of resistance R 18 and the other end of resistance R T, resistance R 17 other end ground connection, the inverting input connecting resistance R19 of voltage comparator ic D, R20, the end of R22, resistance R 21 1 ends and resistance R 20 other ends, the output of voltage comparator ic D joins, the base stage of resistance R 21 another termination transistor BG and an end of resistance R 23, the other end ground connection of resistance R 23, the colelctor electrode of transistor BG connects power cathode, the end of the emitter stage connecting resistance R24 of BG and the positive pole of diode VD9, the negative pole of VD9 connects reference voltage source by resistance R 25; Photoelectricity coupling zero cross fired electronic switching circuit (3) is by photoelectricity coupling zero cross fired device ICF, resistance R 26, R27, R28, capacitor C 5, light emitting diode VD11, bidirectional triode thyristor VS forms, the input one end ground connection of photoelectricity coupling zero cross fired device ICF, the positive pole of other end sending and receiving optical diode VD11, the end of the negative pole connecting resistance R24 of VD11, the emitter stage of transistor BG in another termination delay control circuit (2) of resistance R 24, output one end of photoelectricity coupling over-zero trigger ICF connects the K1 end of bidirectional triode thyristor VS by resistance R 26, the control utmost point G of another termination bidirectional triode thyristor VS, the G utmost point of bidirectional triode thyristor VS and K2 extremely go up and are connected to resistance R 27, resistance R 28, be attempted by the K1 of bidirectional triode thyristor VS after capacitor C 5 series connection, K2 extremely goes up.

Operational amplifier ICE inverting input is connected with output and resistance R T, R18, R17 again in the delay control circuit (2), the RC that capacitor C T the is connected into delay circuit that charges, and the voltage of operational amplifier ICE output is to change with the voltage on the capacitor C T.

The output voltage of operational amplifier ICE is just to export as signal after being differentiated by the signal identification circuit that voltage comparator ic D and resistance R 20, R19, R22 connect in the delay control circuit (2).

ICF is a zero cross fired device that has photoelectricity isolation coupling circuit in the photoelectricity coupling zero cross fired electronic switching circuit (3).

The electronic switching device VS that is triggered by device ICF in the photoelectricity coupling zero cross fired electronic switching circuit (3) is a two-way controllable silicon, and resistance R 28 extremely goes up with the K1, the K2 that are attempted by bidirectional triode thyristor VS after capacitor C 5 is connected.

The utility model advantage compared with prior art is:

1, the delay circuit of this refrigerant compression machine controller utilizes the operation principle of output signal feedback bootstrapping can make the work of RC delay circuit more stable, reliably, and the capacity of timing capacitor can be reduced to one of conventional percentage, help the miniaturization of control circuit, improved reliability, also can reduce production costs.

2, owing to adopted photoelectricity coupling zero cross fired device to go to control the through and off of electronic switch; eliminated the harmonic wave interference problem that on electrical network, produces because of " angle of flow " problem; promptly solved the caused power supply of conventional electrical switch " pollution " problem; even under big capacity, big current conditions, do not have harmonic problem yet; the high capacity that helps the refrigerant compression motor protector also can be applicable on the equipment of other similar functions.

The drawing of accompanying drawing is described as follows:

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is an outline drawing of the present utility model.

The utility model is done with detailed description below with reference to embodiment (accompanying drawing):

As shown in the figure, the utility model is made up of mistake, under-voltage protecting circuit (1), delay control circuit (2), photoelectricity coupling zero cross fired electronic switching circuit (3), accurate reference voltage source circuit (4), rectification power circuit (5), controller out-put supply socket CZ etc.

Controller out-put supply socket CZ is used for connecting the control refrigeration compressor; Rectification power circuit (5) is to connect into half-wave rectifying circuit by step-down transformer T, commutation diode VD8, filter condenser C4; String has fuse FU in the primary return of transformer T, and rectifier power source adopts the mode of plus earth to power.

Accurate reference voltage source circuit (4) is adjusted device by voltage comparator ic C as voltage stabilizing, an end and the ICC inverting input of the anodal connecting resistance R12 of diode VD7, R14; The end of the output of the negative pole of diode VD7 and the negative pole of VD10, ICC, the end of feedback resistance R16 and filter capacitor C3 joins; The reference voltage source of ICC output is that the positive pole by isolating diode VD10 outwards provides; The end of the other end of the in-phase input end of ICC and feedback resistance R16, resistance R 13, R15 is connected; VD7 is that accurate reference voltage source circuit (4) provides reference voltage; The other end ground connection of resistance R 14, R15, they are respectively anti-, the homophase input resistance of voltage comparator ic C.

Cross, under-voltage protecting circuit (1) is made up of voltage comparator ic A, ICB, diode VD1, VD2, VD3, VD4, VD5, VD6, C1, C2, resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, adjustable resistance RP1, RP2; R1, RP1, R3, R5, VD1, C1 and R2, R4, RP2, VD2, R6, C2 were connected into respectively, under-voltage sampling dividing potential drop, rectification circuit, adjust RP1, RP2 can obtain respectively different partial pressure value with determined, under-voltage controller starts to control a little.Alternating voltage sampling is to obtain from transformer T secondary to be added on the common point that R1, R2 link to each other.Same, the inverting input of voltage comparator ic A, ICB connected respectively, under-voltage dividing potential drop sampled rectifier circuit, ICA, ICB anti-, in-phase input end terminates at together with one of resistance R 7 and be connected to obtain reference voltage, R7 other end ground connection with the positive pole of accurate voltage of voltage regulation source output isolating device VD10.The output of ICA, ICB is taken over respectively, under-voltage indicating device light emitting diode VD3 and VD4, is overvoltage with the display circuit duty, and is under-voltage, still normal.VD5, D6 are overvoltage/undervoltage signal output isolating devices, and resistance R 8, R9 are respectively the current-limiting resistances of VD3, VD4.Resistance R 7 is the load of accurate reference voltage source.The resistance R 12 that connects on voltage comparator ic A, the ICB output, R13 are respectively the output loadings of ICA, ICB.Delay control circuit (2) is by amplifier ICE, voltage comparator ic D, transistor BG, resistance R 17, R18, R19, R20, R21, R22, R23, R24, R25, RT, CT form, wherein ICE and RT, R17, R18, CT connect into delay circuit, when line voltage just often, ICA, ICB are output as the zero potential signal, and ICE in-phase end discharge loop ends.When rigidly connecting the energising network source, capacitor C T begins charging via R17, RT loop, voltage on the CT increases in time, current potential on the resistance R of booting simultaneously 18 is also gone up voltage with CT and is increased, at this moment the electric current of RT of flowing through becomes very little, makes that the voltage on the capacitor C T rises very slowly, even at this moment the appearance value of CT has only several microfarads also can reach several minutes effect of time-delay, resistance R 17 is the isolation resistance of boostrap circuit in the circuit, and RT, CT are time set device in the delay circuit.The ICE that reaches a certain setting value when the last voltage of CT will export the in-phase input end that a comparative voltage is added to time-delay judging circuit ICD, the inverting input of ICD connects the intrinsic standoff ratio be made up of resistance R19, R20, R22 than reference circuit, obtain reference voltage, at this moment ICD just exports a negative high potential signal and is added to transistor BG base stage through resistance R 21, the BG conducting, at this moment go here and there input circuit conducting at the optocoupler over-zero trigger of BG emitter circuit, it sends the zero cross fired signal, make bidirectional triode thyristor VS conducting, then socket CZ connects electrical network, power supply.Resistance R 26 is for triggering current-limiting resistance in the circuit; R27 is the biasing resistor of VS; be the feedback resistance of ICD in order to protection controllable silicon VS resistance R 20 on resistance R 28 and the K1 that is connected in parallel on VS after capacitor C 5 is connected, the K2 end; in order to overcome the action of hysteresis acceleration switch; resistance R 21, R25 are current-limiting resistance; diode VD9 is the reference voltage isolating device, and resistance R 23 is the bias device of transistor BG.Be serially connected in light emitting diode VD11 in the ICF input circuit in order to the duty of indication electronic switch, bright expression switch is logical, and the expression switch that goes out is disconnected.

Resistance R 10, be connected on after the R11 series connection, the in-phase input end of ICE in under-voltage signal output part and the delay control circuit (2), be to have served as between the control end of delay circuit, when high potential is born in under-voltage circuit output, (promptly occurred, during under-voltage phenomenon) RC charging device CT in the delay control circuit (2) goes up original electric charge and passes through R10, the R11 loop bleeds off, the output of ICE is to voltage signal of voltage comparator ic D normal phase input end output simultaneously, through ICD, sent an actuating signal by output to BG after differentiating, the signal of ICD output is added to by R21 on the base stage of transistor BG of emitter follower, at this moment, the ICD output voltage signal be zero potential signal BG can not conducting because not conducting of BG optocoupler triggers the input no current of ICF passes through, the output of optocoupler zero-cross triggering circuit Triggerless is so bidirectional triode thyristor turn-offs.

Claims

1, a kind of refrigerant compression machine controller, it is by mistake, under-voltage protecting circuit (1), delay control circuit (2), photoelectricity coupling zero cross fired electronic switching circuit (3), accurate reference voltage source circuit (4), rectification power circuit (5) is formed, of the present utility model being characterised in that: delay control circuit (2) is by operational amplifier ICE, voltage comparator ic D, transistor BG, capacitor C T, resistance R 17, R18, R19, R20, R21, R22, R23, R24, R25, RT, diode VD9 forms, the in-phase input end of operational amplifier ICE meets delay adjustments device capacitor CT, resistance R T, the end of R11, another termination power cathode of capacitor C T, one end of the inverting input of operational amplifier ICE and output and resistance R 18, the in-phase input end of voltage comparator ic D connects, the end of the other end connecting resistance R17 of resistance R 18 and the other end of resistance R T, resistance R 17 other end ground connection, the inverting input connecting resistance R19 of voltage comparator ic D, R20, the end of R22, resistance R 21 1 ends and resistance R 20 other ends, the output of voltage comparator ic D joins, the base stage of another termination transistor BG of resistance R 21 and an end of resistance R 23, the other end ground connection of R23, the colelctor electrode of transistor BG connects power cathode, the end of the emitter stage connecting resistance R24 of BG and diode VD9 positive pole, the negative pole of VD9 connects reference voltage source by resistance R 25; Photoelectricity coupling zero cross fired electronic switching circuit (3) is by photoelectricity coupling zero cross fired device ICF, resistance R 26, R27, R28, capacitor C 5, light emitting diode VD11, bidirectional triode thyristor VS forms, the input one end ground connection of photoelectricity coupling zero cross fired device ICF, the positive pole of other end sending and receiving optical diode VD11, the end of the negative pole connecting resistance R24 of VD11, the emitter stage of transistor BG in resistance R 24 another termination delay control circuits (2), output one end of photoelectricity coupling zero cross fired device ICF connects the K1 end of two-phase controllable silicon VS by resistance R 26, the control utmost point G of another termination two-phase controllable silicon VS, the G utmost point of bidirectional triode thyristor VS and K2 extremely go up and are connected to resistance R 27, resistance R 28, be attempted by the K1 of bidirectional triode thyristor VS after capacitor C 5 series connection, K2 extremely goes up.

2, refrigerant compression machine controller according to claim 1, it is characterized in that: operational amplifier ICE inverting input is connected the RC that is connected into resistance R T, R18, R17, the capacitor C T delay circuit that charges again with output in the delay control circuit (2), and the voltage on the output of operational amplifier ICE is to change with the voltage on the capacitor C T.

3, refrigerant compression machine controller according to claim 1 is characterized in that: the output voltage of operational amplifier ICE is just to export as signal after being differentiated by the signal identification circuit that voltage comparator ic D and resistance R 20, R19, R22 connect in the delay control circuit (2).

4, refrigerant compression machine controller according to claim 1 is characterized in that: ICF is a zero cross fired device that has photoelectricity isolation coupling circuit in the photoelectricity coupling zero cross fired electronic switching circuit (3).

5, according to claim 1 or 4 described refrigerant compression machine controllers, it is characterized in that: the electronic switching device VS that is triggered by device ICF in the photoelectricity coupling zero cross fired electronic switching circuit (3) is a two-way controllable silicon, and resistance R 28 extremely goes up with the K1, the K2 that are attempted by bidirectional triode thyristor VS after capacitor C 5 is connected.