CN86107077A

CN86107077A - Electronic control circuit for refrigerating compressor

Info

Publication number: CN86107077A
Application number: CN198686107077A
Authority: CN
Inventors: 孟祥厚
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-10-06
Filing date: 1986-10-06
Publication date: 1987-08-26

Abstract

A kind of electronic control circuit for refrigerating compressor is mainly used in the production household electric refrigerator.Replaced traditional Starting mode by electronic circuit, temperature control mode, hot protected mode.According to this circuit design of most common failure of current refrigerator electric network fault protection system and energy-conservation AC voltage-stabilizing system and the error protection of refrigerator own, warning system are arranged.Can strengthen operational reliability, reduce repair rate, prolong main frame service life, be operated in relatively poor rural area of power supply quality and area.This circuit also can be produced refrigerator and add protector, and cost is very low, and the function of electric network fault and the error protection of refrigerator own is arranged.

Description

Electronic control circuit for refrigerating compressor

This invention is an electronic control circuit for refrigerating compressor.Be mainly used in the neutralize control of other refrigeration compressor of household electric refrigerator.Can make protector with the part of circuit wherein, be used for the protection that adds of refrigerator refrigeration compressor.

Existing refrigerator control system generally adopts conventional art, is made up of gravity type starting relay, hot protective relay, temperature-sensitive cavate temperature controller etc." snowflake board ", " ten thousand precious boards " refrigerator that produce in Guangzhou of producing of Beijing for example.To the more perfect protection system of main frame neither one.Because inevitably power supply trouble and some regional power supplies are of poor quality, it is common in some areas that line voltage is lower than 180 volts under-voltage phenomenon.When zero line was opened a way, the imbalance of three-phase voltage sometimes can be high to more than 300 volts, also has the power failure of short time, some faults of refrigerator itself all can produce overcurrent to main frame, are not to burn main frame at once, make its insulation ag(e)ing exactly, reduction of service life, can make troubles to the user like this.Even if repairing also, difficulty reaches quality requirement.Adopt the dynamical type starting relay, hour can not guarantee pressure between the contact to make contact unreliable at electric current, the startup circuit that has adopts thermistor, has that pressure drop is big, power consumption is many, the shortcoming of under-voltage startability difference.

Task of the present invention is to design a kind of electronic control circuit that can strengthen operational reliability, reduce anti-revisionist rate, improve the quality of products in order to overcome above shortcoming.

This electronic control circuit for refrigerating compressor is characterized in that all being made up of electronic circuit.With bidirectional triode thyristor KS1 and KS ₂Connect main circuit whole control circuit oncontactings are revealed, form first reference level by voltage-stabiliser tube D13.Form second reference level by supply voltage VCC.Voltage control circuit as overvoltage and under-voltage protection is arranged; The error protection start-up circuit of refrigerator own; Delay driving circuit; Energy-conservation AC voltage-stabilizing circuit; The overheat protector temperature-control circuit; Start holding circuit.

Solution of the present invention, available following accompanying drawing further specifies.

Fig. 1 is the optimum implementation of electronic control circuit for refrigerating compressor, is made up of power circuit, voltage control circuit, the error protection start-up circuit of refrigerator own, delay driving circuit, overheat protector temperature-control circuit.Electric network fault protection, the error protection of refrigerator own, the fault alarm of refrigerator own are arranged, overheat protector, startup, the multinomial function of temperature control.

Fig. 2 electronic control circuit for refrigerating compressor is to have added energy-conservation AC voltage-stabilizing circuit on the basis of Fig. 1, and energy-saving effect is four times that current refrigerator adds AC voltage regulator.

Fig. 3 is an electronic control circuit for refrigerating compressor of connecting main circuit with bidirectional triode thyristor, and oncontacting is revealed, the corresponding raising of cost.The decline of controllable silicon price can become optimum implementation in the future.

Fig. 4 utilizes electronic control circuit for refrigerating compressor voltage control circuit wherein, the error protection warning circuit of refrigerator own, the circuit that is used for producing " refrigerator adds electric network fault, the failure protector of refrigerator own " that delay driving circuit is formed.It is the circuit of producing " refrigerator adds the electric network fault protector " that own fault secure circuit is wherein removed, and is used to have the external control of refrigerant compression machine equipment.

Voltage-stabiliser tube D13 provides first reference level among Fig. 1.Resistance R 18 is to make voltage-stabiliser tube D13 working stability, forms power circuit by fuse RD, step-down transformer B1, commutation diode D1, D2, filter capacitor C1, voltage-stablizer W.Supply voltage VCC provides the second datum line level again when circuit provides power supply.One end of the positive pole of the positive pole of the colelctor electrode of triode BG5, capacitor C 13, diode D14 and resistance R 19 links together, and this tie point is set at 1.Being conducting to of triode BG5 ends, and 1 is from the low level to the high level.

The voltage control circuit is used for the protection of electric network fault, line voltage just often, 1 is high level.When line voltage was under-voltage, the voltage that the under-voltage divider of being made up of resistance R 6 and R8, potentiometer R7 is told descended.The level of diode D12 and capacitor C 4 and resistance R 35 tie points is lower than first reference level, triode BG4 ends, electric current on resistance R 17 capacitor C 12 injects the base stage of triode BG5 through diode D8, electric current on resistance R 19 capacitor C 12 flows into system earth through triode BG5, and 1 becomes low level.During the electrical network overvoltage, by resistance R 9 and R11, the voltage that the overvoltage divider that potentiometer R10 forms is told raises, and the level of diode D11 and capacitor C 5 and resistance R 36 tie points is higher than first reference level, makes triode BG5 conducting, and 1 becomes low level.Potentiometer R7 makes under-voltage limit value potentiometer down, and potentiometer R10 adjusts the minimum permission operating voltage of potentiometer R7 to compression motor M as limit value potentiometer in the overvoltage, adjusts the highest permission operating voltage of potentiometer R10 to compressor electric motor M.

Delay driving circuit.The time-delay part is used for the control at intermittence of electric network fault protection and compression motor M.1 electric current when being high level is given capacitor C7 charging through the normally-closed contact J2-1 of resistance R 19 and R20, diode D14, relay J 2, the charging time-delay raises current potential, make triode BG6 conducting through voltage-stabiliser tube D15, the electric current on the resistance R 21 injects ground through triode BG6.Triode BG7 ends, and the electric current of resistance R 22 injects triode BG8, relay J 2 adhesives, and the normally opened contact J2-3 of relay J 2 connects main circuit, and compression motor M is started working.At the same time, the normally opened contact J2-2 of relay J 2 gives capacitor C 7 discharges.As long as the every running of compression motor M once finishes, running all will be through time-delay again once more.When compression motor M starts, supply voltage is descended about 20 volts.For guarantee starting under-voltage normal operation, by the startup holding circuit that diode D14 and capacitor C 6 are concatenated into, make 1 under-voltage when becoming low level because of starting, the positive pole of capacitor C 6 is still high level, this high level can be kept the connection of main circuit in short-term.The effect of diode D16 is to eliminate the high pressure that relay J 2 produces.

The error protection start-up circuit of refrigerator own, i.e. fault overcurrent protection start-up circuit.Line voltage is limited in the value of permission, has under the situation of delay protection, except that starting overcurrent in short-term and the overcurrent that produces can only be from the fault of refrigerator itself.After refrigerator produced the fault overcurrent, the effect value terminal voltage on the signal resistance R1 raise, and electric current is through diode D3, and by diode D4 and D5 voltage stabilizing, capacitor C 2 filtering after resistance R 2 and R3 dividing potential drop, give capacitor C 3 chargings by resistance R 4.When charging is delayed time to and set, by the eternal conducting of control circuit that triode BG1 is connected with BG2, make the light emitting diode D7 of serial connection send fault alarm, fall into low level to 1, J2 never can adhesive, and the circuit of compression motor M is cut off, and plays a protective role.The voltage that overcurrent during startup, signal resistance R1 produce is through rectifying tube D3, by resistance R 5 electric current injected the base stage of triode BG3, triode BG3 conducting, and the startup winding of compression motor M is connected in relay J 1 adhesive by the normally opened contact J1-1 of relay J 1.Starting current drops to setting value, and because of the terminal voltage on the signal resistance R1 descends, triode BG3 ends, and relay J 1 discharges, and has finished to start and has followed journey.The effect of diode D6 is to eliminate the high pressure that relay J 1 produces.

Overheat protector temperature-control circuit: provide first reference level by voltage-stabiliser tube D13.Provide second reference level by supply voltage VCC.Temperature control resistance R 12, temperature control potentiometer R13 with as the probe thermistor R14 be serially connected.After temperature in the refrigerator improved, thermistor R14 resistance diminished, and the voltage of being told by the mid point of potentiometer R13 descends, and electric current can not inject triode BG5 through diode D10, and 1 is high level, and trigger makes relay J 2 adhesives, and compression motor M rotates.After temperature descended in the refrigerator, thermistor R14 resistance strengthened, and potentiometer R13 midpoint potential is elevated to adjusted value, and relay J 2 discharges compression motor M stall.Resistance R 16 and thermistor R15 serial connection in the overheat protector, thermistor R15 places by the compression motor as temp probe.After compression motor M body temperature raise, thermistor R15 resistance diminished, and resistance R 16 and thermistor R15 serial connection point current potential raise, and electric current injects triode BG5 through diode D9, and 1 is low level, and relay J 2 disconnects, and compression motor M stall plays a protective role.

Fig. 2 has added energy-conservation AC voltage-stabilizing circuit on the basis of Fig. 1.The control system of this circuit is by the VCC supply power.Line voltage just often, the voltage that the divider of being made up of resistance R 23 and R25 and potentiometer R24 is told raises, the level of diode D17 and capacitor C 8 and resistance R 37 tie points surpasses first reference level, triode BG9 conducting, the electric current on resistance R 26 capacitor C 14 can not inject triode BG10 through voltage-stabiliser tube D18.Therefore the electric current on the resistance R 27 injects triode BG11, relay J 3 adhesives, and its normally opened contact J3-1 connects, and normally-closed contact J3-2 disconnects, and transformer B2 does not work.Otherwise line voltage descends, and relay J 3 discharges, and transformer B2 begins to boost and delivers to compression motor M, plays pressure stabilization function.The effect of diode D19 is to eliminate the high pressure that relay J 3 produces.Other symbol description is referring to Fig. 1, and this voltage stabilizing of device partly can improve four times than adding the AC voltage regulator energy-saving effect in the refrigerator.Because main consuming components transformer B2 does not just often work at line voltage, when not rotating, compression motor M do not work.

Fig. 3 has been Duoed triggering bidirectional triode thyristor power supply and isolating transformer B3 than Fig. 1.Wherein the charge-discharge circuit of delay capacitor C7 and Fig. 1 are different.The effect of diode D11, D12 is to constitute temperature-compensating with voltage-stabiliser tube D13, eliminates influence of temperature variation.Diode D22 capacitor C 11 is to provide negative supply to circuit, and other symbol description is referring to Fig. 1.

Setting up and triggering the bidirectional triode thyristor power supply is for saves energy.This supply voltage is lower, and power consumption is less, and as bigger with higher supply voltage VCC power consumption, through diode D23 and D24 rectification, capacitor C 10 filtering provide trigger current to bidirectional triode thyristor KS1 and KS2 again.

The charge-discharge circuit of capacitor C 7 is to give capacitor C 7 chargings by FET BG12.When leading to when the voltage of capacitor C 7 is elevated to triode BG6, also conducting of triode BG8.The control utmost point B point of the colelctor electrode B point of triode BG8 and bidirectional triode thyristor KS2 joins.After the control utmost point of bidirectional triode thyristor KS2 added the negative pressure triggering and conducting, the operation winding of compression motor M was switched on, and the terminal voltage of signal resistance R1 raises, and by isolating transformer B3, makes triode BG3 conducting.The control utmost point A point of the A point of current-limiting resistance R28 and bidirectional triode thyristor KS1 joins.After the control utmost point of bidirectional triode thyristor KS1 adds the negative pressure triggering and conducting, finish to start after the signal resistance R1 terminal voltages such as startup winding of connection compression motor M descend and follow journey.The effect of capacitor C 9 is to make the triggering of bidirectional triode thyristor KS2 more reliable.

In triode BG8 conducting, the terminal voltage of resistance R 31 raises, triode BG13 conducting, and divider resistance R 30, R32, R33 connect on the positive-negative power respectively.The mid point of resistance R 30, R33 is a negative pressure at this moment, and FET BG12 turn-offs.Capacitor C 7 is through diode D21, resistance R 29 discharges.When triode BG13 ended, the negative pole of diode D20 was a malleation, and FET BG1.2 conducting gives capacitor C 7 chargings.

After power supply advances input AC among Fig. 4,, provide working power to circuit after diode D31, D32 rectification, voltage-stabiliser tube D33 voltage stabilizing, capacitor C 32 filtering through fuse RD, by capacitor C 31 step-downs.Capacitor C 33 is to eliminate the voltage that line capacitance produces, by output X1 and X2 to the refrigerator power line.Other symbol description is referring to Fig. 1.

Voltage control circuit and overheat protector control circuit can be connected in series diode compensation as being acted upon by temperature changes on voltage-stabiliser tube D13.If capacitor C 4, C5, C12, C13, certain element can not wanted as the effect when adjusting is not obvious among resistance R 35, the R36.

This circuit mainly designs according to the certain situation that China's condition of power supply and refrigerator damage, and can strengthen reliability of operation, reduce anti-revisionist rate, eliminates the noise of control system, prolongs main frame service life, improves the quality of products.Be operated in relatively poor rural area of power supply quality and area, make refrigerator with Fig. 4 circuit and add protector, can reduce the fault of refrigeration compressor.

Claims

1, a kind of electronic control circuit for refrigerating compressor is characterized in that this circuit all is made up of electronic circuit, forms first reference level by voltage-stabiliser tube D13; Form second reference level by supply voltage VCC; The voltage control circuit is arranged in the circuit, start holding circuit, the error protection start-up circuit, the overheat protector temperature-control circuit, energy-conservation alternating current steady voltage plug, the charge-discharge circuit of delay capacitor C7, decompression capacitor C31 and output X1 and X2, under-voltage lower limit adjust potentiometer R7 and the overvoltage upper limit is adjusted potentiometer R10; Bidirectional triode thyristor KS1 and KS2 are that main circuit is connected element to whole circuit oncontacting is revealed.

2, electronic control circuit for refrigerating compressor according to claim 1, the under-voltage divider that it is characterized in that said voltage control circuit is made up of resistance R 6 and R8 potentiometer R7, the overvoltage divider is made up of resistance R 9 and R11 potentiometer R10, diode D12 negative pole is connected with capacitor C 4 resistance R 35 triode BG4, the negative pole of diode D11 is connected with capacitor C 5 resistance R 36 triode BG5, resistance R 35 and resistance C4 also connect, resistance R 36 and capacitor C 5 also connect, the positive pole of diode D8 connects the colelctor electrode of triode BG4, the negative pole of diode D8 connects the base stage of triode BG5, the colelctor electrode of triode BG4 connects capacitor C 12, the base stage of diode D12 and triode BG4 is serial connection to emitter stage to voltage-stabiliser tube D13, the base stage of diode D11 and triode BG5 is serial connection to emitter stage to voltage-stabiliser tube D13, and the colelctor electrode of triode BG5 is gone here and there respectively to voltage-stabiliser tube D15 and capacitor C 13.

3, electronic control circuit for refrigerating compressor according to claim 1 is characterized in that said startup holding circuit is by diode D14 and capacitor C 6 serial connections.

4, electronic control circuit for refrigerating compressor according to claim 1 is characterized in that said error protection start-up circuit has signal resistance R1, rectifying tube D3, Zener diode D4 and D5, filter capacitor C2, divider resistance R2 and R3, delay capacitor C3; Triode BG1 and BG2 form a control circuit, the end serial connection light emitting diode D7 of this circuit, resistance R 5 is gone here and there to the base stage of triode BG3, triode BG3 link to each other with relay J 1 or and the control utmost point of bidirectional triode thyristor KS1 be connected in series.

5, electronic control circuit for refrigerating compressor according to claim 1, it is characterized in that the temperature control part branch in the said overheat protector temperature-control circuit is connected in series by resistance R 12 potentiometer R13 thermistor R14, the mid point of potentiometer R13 is connected in series with the base stage of triode BG5 by diode D10; The overheat protector part is by thermistor R15 and resistance R 16 serial connections, and the tie point of thermistor R15 and resistance R 16 is by the base stage serial connection of diode D9 and triode BG5.

6, electronic control circuit for refrigerating compressor according to claim 1, the power supply that it is characterized in that the control system of said energy-conservation alternating current steady voltage plug is to be supplied with by supply voltage VCC and system earth, the power input line of transformer B2 can disconnect by controlled circuit J3-2, resistance R 23 is arranged, R25, the divider that potentiometer R24 forms, the negative pole of diode D17 is connected with capacitor C 8 resistance R 37 triode BG9, capacitor C 8 and resistance R 37 also connect, the emitter stage of voltage-stabiliser tube D13 and triode BG9 is connected in series with diode D17 to base stage, and the colelctor electrode of triode BG9 is connected to voltage-stabiliser tube D18 and capacitor C 14.

7, electronic control circuit for refrigerating compressor according to claim 1, the charge-discharge circuit one that it is characterized in that said delay capacitor C7 is made up of the normally-closed contact J2-1 and the normally opened contact J2-2 of relay J 2; It two is linked to each other with capacitor C 7 by FET BG12, has resistance R 31 to go here and there to the base stage of triode BG13, the collector series connection resistance R 29 of triode BG13 and diode D21, and divider resistance R30, R32, R33 connect on the positive-negative power respectively.