CN87105169A - Electronic control circuit for refrigerator - Google Patents

Abstract

This technology is mainly used in household electric refrigerator.By electronic circuit replacing existing electrothermal relay and Starting mode, unlikely the burning with whole refrigerator oncontacting of main frame winding revealed.For refrigerator work is provided with energy-conservation voltage-stabilized power supply in utmost point wide-voltage range.When 0～10 ℃ of room temperature, can make refrigerating chamber become refrigerating chamber and give full play to the refrigerator effect.And have that the two temperature in two chambers are adjustable respectively, functions such as quick-frozen electric leakage security personnel, temperature show, energy-saving run.Establish two reference levels and a plurality of differential amplifier in the circuit cost is greatly descended, the reliability height.Having many accompanying drawings to be suitable for the various refrigerator of each factory uses.Can manufacture five-function refrigerator external preserving device with a circuit part.

Description

The invention belongs to electronic control circuit, be mainly used on the household electric refrigerator, also be applicable to the refrigeration plant that some have refrigeration compressor.

Refrigerator on the present China market, " the ten thousand precious boards " refrigerator as Guangzhou generally adopts traditional control technology, is made up of gravity type starter relay, hot protective relay, temperature-sensitive cavate temperature controller, the molten white time relay etc.The shortcoming of electrothermal relay protection main frame is can not shield in some cases, but till switching is burnt to main frame winding or relay repeatedly.When reducing, electric current can not guarantee the end pressure of its contact to make loose contact with traditional gravity type starting relay; With semistor its to start pressure drop big, startability is poor under the generally low situation of China's line voltage, and this resistance will consume certain electric energy during operation.Traditional control technology can not safe operation and energy-saving run, exists main frame short, poor reliability in service life, and function is few, and the user uses shortcomings such as inconvenience.

The objective of the invention is to design a kind of multiple functional, reliability is high, is suitable for the electronic control circuit for refrigerator that various refrigerator is used.

Feature one of the present invention is with overvoltage crowbar, under-voltage protecting circuit, temperature-sensitive power failure delay protection circuit, itself (refer to refrigerator itself, non-electric network fault, as follows) fault secure circuit, start-up circuit has replaced traditional electrothermal relay protection and Starting mode, makes can effectively protect compressor and guarantee to have good startability under various overcurrent conditions; The 2nd, carry out the overheat protector of compressor with thermistor as temperature sensor, action is accurately and reliably; The 3rd, design has energy-conservation alternating current steady voltage plug circuit in the circuit, makes the supply voltage still can operate as normal at certain fluctuation range inner compressor; The 4th, positive negative temperature temperature control definite value potentiometer R is arranged ₁₂, R ₅₁, R ₁₁₄, temperature of refrigerating chamber is controlled at below 0 ℃; The 5th, for the temperature that makes refrigerating chamber and refrigerating chamber can be regulated respectively, in direct cooling refrigerator, adopt the solenoid control refrigeration, in the gasifying type refrigerator, adopt motor to drive air door; The 6th, automatic heating circuit is arranged, utilize the thermistor detected temperatures, make heater strip heating automatically at low temperatures; The 7th, the electric leakage safety circuit is arranged, low, the safety of cost; The 8th, the defrost circuit adopts manually defrosting automatic reset circuit in direct cooling refrigerator, and cost is low, and circuit is simple and reliable, has adopted the timing automatic defrosting circuit in the gasifying type refrigerator; The 9th, in the temperature indicator circuit, adopt a plurality of common thermistors to make temperature sensor, this circuit cost is low, pointing accuracy is high, the good adjustment; The tenth, provide the first reference level V by output end of voltage stabilizer in the line ₂, by voltage-stabiliser tube D ₁₂The second reference level V is provided ₃; 11 is to have adopted the differential amplifier of being made up of triode CQ, has simplified circuit, and cost is low; 12 is in the line to the second reference level V ₃Adopted with the temperature compensation system of transistor base to emitter voltage drop and diode drop composition, 13 is for the variation of the ratio of anti-electrical network crest voltage and mean value voltage, has with resistance R in the circuit ₆₄, R ₇₀, R ₁₁₀, R ₁₁₁, capacitor C ₂₆, C ₂₈, C ₃₄, C ₃₅The circuit of forming has improved the precision that detects voltage.14 is for making the bidirectional triode thyristor reliable trigger, and design has quick-break, speed conduction road.

Fig. 1 is the electronic control circuit for refrigerator that temperature control, overvoltage protection, under-voltage protection, temperature-sensitive power failure delay protection, automatic heating function are arranged.

Fig. 2 is an electronic control circuit for refrigerator of connecting main circuit with bidirectional triode thyristor, and its function is identical with Fig. 1.

Fig. 3 is the electronic control circuit for refrigerator of negative pressure triggering bidirectional triode thyristor, and its function is identical with Fig. 1.

Fig. 4 is the electronic control circuit for refrigerator that temperature control, starting, the error protection of refrigerator own, overheat protector, overvoltage protection, under-voltage protection, temperature-sensitive power failure delay protection function are arranged.

Fig. 5 is the electronic control circuit for refrigerator of bidirectional triode thyristor connection main circuit, and its function is identical with Fig. 4.

Fig. 6 is the electronic control circuit for refrigerator of negative pressure triggering bidirectional triode thyristor, and its function is identical with Fig. 4.

Fig. 7 be on the basis of Fig. 4 many snap frozen, energy-saving runs, partly thaw, the temperature of refrigerating chamber and refrigerating chamber can distinguish the electronic control circuit for refrigerator of regulatory function.

Fig. 8 and Fig. 9 are energy-conservation alternating current steady voltage plug circuit.

Figure 10, Figure 11, Figure 12 are the electric leakage safety circuit.

Figure 13 is the circuit with light emitting diode indication refrigerating chamber and freezer temperature.

Figure 14 is the overlong time warning circuit that opens the door.

Figure 15 is for improving the circuit of voltage detecting circuit accuracy class.

Figure 16 is the gasifying type refrigerator drives air door with motor a temperature-control circuit.

Figure 17 is the manual defrost automatic reset circuit of direct cooling refrigerator.

Figure 18 is the timing automatic defrosting circuit.

Figure 19 adds the circuit of electrical network overvoltage, under-voltage, power failure, refrigerator earth leakage protective device for refrigerator.

Figure 20 adds the circuit of protector for the refrigerator of many error protections of refrigerator own, warning function on the basis of Figure 19.

In Fig. 1 circuit terminals 1 and 2 be connected to electrical network, power supply behind fuse RD by capacitor C ₁Step-down, diode D ₁, D ₂, D ₃, D ₄Rectification, voltage-stabiliser tube D ₅Voltage stabilizing, capacitor C ₂, C ₃Filtering is at the output V by voltage-stablizer W ₂Provide first reference level, V to circuit ₂When first reference level is provided and V ₁Provide working power to circuit together.Voltage-stabiliser tube D ₁₂Effect be to provide the second reference level V to circuit ₃, resistance R ₃₁Effect be to voltage-stabiliser tube D ₁₂Import certain electric current, make its work more stable.Light emitting diode D ₂₉Be to indicate as power supply.

Resistance R in the temperature-control circuit ₁₀, positive negative temperature temperature control definite value potentiometer R ₁₂Thermistor R ₁₃Form the temperature control divider, thermistor R ₁₃Place in the refrigerating chamber when temperature of refrigerating chamber is lower than definite value temperature as temperature-control senser, just negative temperature temperature control definite value potentiometer R ₁₂The current potential of mid point surpasses the second reference level V ₃Current potential add triode Q ₅Base stage is to emitter stage step-down and diode L ₁₃Pressure drop after, triode Q ₅Conducting, its colelctor electrode are from the high potential to the electronegative potential, and this moment is by triode CQ ₆, CQ ₇, CQ ₈The differential amplifier of forming is by conducting, as the light emitting diode D of operation indication ₃₄Stop luminous, relay J ₁Discharge its normally opened contact J _1-1Cut off main circuit, compressor M ₁Out of service, refrigeration stops, simultaneously resistance R ₃₅With feedback resistance R ₃₃The current potential of tie point raises, feedback resistance R ₃₃Beginning is to positive negative temperature temperature control definite value potentiometer R ₁₂The mid point input current, make triode R ₅More difficult ending.Otherwise in relay J ₁During adhesive, resistance R ₃₅With feedback resistance R ₃₃The current potential of tie point descends, positive negative temperature temperature control definite value potentiometer R ₁₂The part electric current of mid point is by feedback resistance R ₃₃Input ground makes triode Q ₅Feedback resistance R is adjusted in more difficult conducting ₃₃Effect be the temperature difference of adjusting start and shutting down, as start when thinking 6 ℃ is shut down in the time of 3 ℃, adjusts feedback resistance R ₃₃Value just can reach.Resistance R ₁₁Effect be the bound of adjusting the definite value temperature, make positive negative temperature temperature control definite value potentiometer R ₁₂Movable in certain temperature control scope, capacitor C ₁₁Effect be to eliminate outside interference to circuit.This temperature-adjusting circuit changes in room temperature under 50 ℃ the situation, and temperature-controlled precision is easy to adjust to the variation less than ± 00.5 ℃ because on the value of transcribing respectively voltage-stabiliser tube D ₁₂Voltage temperature coefficient and triode Q ₅Base stage to the pressure drop of emitter stage adds diode D ₁₃Forward voltage drop just in time compensate counteracting with variation of temperature, adjust resistance R ₃₁To voltage-stabiliser tube D ₁₂Input current circuit is not acted upon by temperature changes substantially.Adjust potentiometer R ₁₂Can make refrigerating chamber definite value temperature adjust to more than 0 ℃ or below, room temperature article in the time of 0～10 ℃ need not refrigeration, adjust potentiometer R ₁₂Temperature of refrigerating chamber is adjusted to below 0 ℃, and refrigerating chamber just changes refrigerating chamber into and uses.Potentiometer R ₁₂Can special slip customized long linear potentiometer, remind the user to note at standardized red-way of 0 ℃ critical point.

In the temperature-sensitive power failure delay circuit, as triode Q ₅Current collection very during high potential, electric current is through resistance R ₃₄, FET Q ₁₁Give delay capacitor C ₉Charging, charging is delayed time to when setting by triode CQ ₆CQ ₇CQ ₈Just conducting of the differential amplifier of forming, relay J ₁Just adhesive, FET Q at this moment ₁₁End delay capacitor C ₉Through diode D ₃₂And resistance R ₃₆Compose in series the loop discharge, in order to time-delay next time, the purpose of delay protection effect is to prevent to have a power failure in short-term to compressor M ₁Injury and sensor R ₁₃Touch just put into refrigerator than hot object after the main circuit conducting to compressor M ₁Injury.This circuit is not as wanting FET Q ₁₁With diode D ₃₂And resistance R ₃₆The delay capacitor C that forms ₉Charge-discharge circuit reliably design according to Figure 19.

Undervoltage detection circuit in the under-voltage and overvoltage crowbar is by resistance R ₁, R ₂Potentiometer R ₃Form under-voltage divider, in the over-voltage detection circuit by resistance R ₄, R ₅, potentiometer R ₆Form the overvoltage divider, directly insert electrical network, when line voltage is low, potentiometer R ₃Midpoint potential reduces, triode Q ₄End, electric current is through resistance R ₃₀, diode D ₁₄Inject triode Q ₅, its current collection is electronegative potential very, relay J ₁Not adhesive.When line voltage is high, potentiometer R ₆Midpoint potential raise triode Q ₅Conducting, its current collection is electronegative potential very, resistance R ₃₂On electric current input ground, relay J ₁Not adhesive is only at line voltage triode Q just often ₄Conducting, triode Q ₅End relay J ₁Could adhesive.Diode D ₁₀, D ₁₁Effect be and triode Q ₄, Q ₅Base stage to emitter voltage drop cooperate and voltage-stabiliser tube D ₁₂Constitute temperature-compensating, when eliminating variations in temperature to detecting the influence of voltage accuracy.Capacitor C ₆And C ₇Effect be to make triode Q ₄And Q ₅Its collector potential can not be raise.In order to prevent compressor M ₁Electrical network during startup is under-voltage and electrical network in transient voltage and instantaneous overvoltage, in the circuit by diode D ₁₆And capacitor C ₈Join and form electrical network transient fluctuation holding circuit, guarantee its operate as normal.

Automatically link to each other with heater by terminals 3 in the heating line, when temperature is hanged down by resistance R ₇, as the thermistor R of sensor ₈The voltage that the divider of forming is told raises, through compensation diode D ₂₇Inject electric triode CQ ₁, CQ ₂, CQ ₃The differential amplifier of forming, heating indication light emitting diode D ₂₈Begin luminous, relay J ₂Adhesive, its normally opened contact J _2-1Connecting heater through terminals 3 is the refrigerating chamber heating.Relay J when otherwise temperature is high ₂Not adhesive, heater does not heat, resistance R ₉Effect be that the second reference level V is injected in restriction ₃Electric current, capacitor C ₁₀Effect be to eliminate outside circuit not disturbed diode D ₂₆Effect be to make start the time stop heating, diode D ₁₇And D ₁₈Be to eliminate relay J ₁And J ₂The high pressure that coil produces.This circuit power is as without capacitor C ₁The also available transformer step-down of step-down.Can in 20 millimeters, can be put in the refrigerator top together with capacitance decompression entire circuit thickness with operation panel.

Main circuit bidirectional triode thyristor KS in Fig. 2 circuit ₁Connect heater circuit bidirectional triode thyristor KS ₂Connect resistance R ₄₄And capacitor C ₁₄Be to bidirectional triode thyristor KS ₁Carry out resistance-capacitance protection, prevent that inductive load from producing high pressure, resistance R ₁₄And R ₁₅Being current limliting uses.

Because the positive half cycle conducting and the negative half period conducting trigger current of bidirectional triode thyristor are different, with rectification filtering power be not absolute non-ripple, so design has controllable silicon speed conduction road and controllable silicon quick-break circuit in this circuit, making it can be to compressor M ₁Add in the low pressure speed conduction road of half-wave DC and non-sinusoidal waveform and work as resistance R ₃₉The voltage at two ends is greater than triode Q ₉Base stage to emitter stage when falling, triode Q ₉Conducting, its colelctor electrode are electronegative potential just, resistance R ₃₈On electric current input ground, this moment FET Q ₁₁End feedback resistance R ₃₃Positive negative temperature temperature control definite value potentiometer R ₁₂The part electric current input ground of mid point, resistance R ₃₂On electric current through resistance R ₃₄All input is by triode CQ ₆, CQ ₇, CQ ₈The differential amplifier of forming is added to bidirectional triode thyristor KS ₁On electric current never electrical conduction current arrive maximum current immediately, bidirectional triode thyristor KS ₁Open to maximum to the angle of flow immediately from not on-state, reach speed and lead purpose.Work as triode CQ in the quick-break circuit ₈When the base stage input current reduced, colelctor electrode to emitter stage both end voltage raise, and raising surpasses triode Q ₁₀Base stage is during to emitter voltage drop, and electric current is through resistance R ₄₀Current limliting makes triode Q ₁₀Conducting, resistance R ₃₄On electric current through diode D ₃₁Whole input capacitance C ₁₇, this moment is by triode CQ ₆, CQ ₇, CQ ₈The differential amplifier of forming ends bidirectional triode thyristor KS ₁Because of the quick-break of triggerless electric current.As triode CQ ₈During conducting, capacitor C ₁₇On electric current through diode D ₃₃And resistance R ₄₁Discharge, resistance R ₄₁Be restriction discharge current usefulness, diode D ₃₃Be to prevent through resistance R ₄₁Give capacitor C ₁₇Charging.Resistance R ₃₇Be restriction triode CQ ₇On electric current.Other symbol description is referring to Fig. 1 among the figure.

In Fig. 3 circuit by transformer B ₁Step-down triggers the bidirectional triode thyristor conducting with negative pressure, because bidirectional triode thyristor negative pressure triggering and conducting is reliable, establishes a power supply that voltage is lower in addition with the negative pressure triggering, not only can save electric energy, and power transformer B ₁Power also can reduce.Trigger the bidirectional triode thyristor power supply by diode D ₆, D ₇Rectification, capacitor C ₄Filtering provides.

Resistance R ₄₂For bidirectional triode thyristor KS is injected in restriction ₁Trigger current usefulness, diode D ₃₀Effect be to make when start heater stop heating.Other symbol description is referring to Fig. 1 and Fig. 2 among the figure.

In Fig. 4 circuit by power transformer B ₁Power supply is provided, in the start-up circuit, works as relay J ₁Normally opened contact J _1-1Connect compressor M ₁The operation circuit time, the sample resistance R that is connected with electrical network ₂₀The voltage of two ends raises, through resistance R ₂₆Current limliting input triode Q ₁₄Base stage, make relay J after electric current amplifies ₃Adhesive is by its normally opened contact J _3-1Connect compressor M ₁Start-up circuit, reduce sample resistance R to starting current ₂₀Both end voltage reduces, triode Q ₁₄Cutoff relay J ₃Discharge, disconnect start-up circuit, just finished compressor M ₁Start-up course.Capacitor C ₂₀Effect be at triode Q ₁₄Guarantee relay J under the situation of half-wave conducting ₃Adhesive diode D ₁₉Be to eliminate relay J ₃The high pressure that coil produces.Can design with reference to Fig. 5 with two triodes amplifications as improving the sensitivity that starts again.This circuit has replaced traditional starting relay.

In the fault secure circuit of refrigerator own, as the sample circuit R that is connected with electrical network ₁₉The voltage at two ends hinders overcurrent for some reason and after raising, sampling current is through diode D ₃₅Rectification, resistance R ₂₁Current limliting, diode D ₃₆, D ₃₇Voltage stabilizing, capacitor C ₁₈Filtering, resistance R ₂₂And R ₂₃Dividing potential drop is after start time delay resistance R ₂₄Give and start delay capacitor C ₁₉The charging capacitor C of delaying time ₁₉Positive electrode potential surpass triode Q ₁₂Base stage is during to emitter voltage drop, by triode Q ₁₂, Q ₁₃The eternal conducting of forming of memory circuit is triode CQ ₇Collector potential lowers and makes electric current input ground, compressor M ₁Because of being cut off, power supply reaches the protection purpose.While light emitting diode D ₃₈Through resistance R ₂₅Send fault alarm after the current limliting, prove promptly after the warning that refrigerator is bad, should go maintenance.In this circuit through diode D ₃₆, D ₃₇Voltage stabilizing and resistance R ₂₂, R ₂₃Dividing potential drop is to make action current more accurate, adjusts sample resistance R ₁₉Resistance can adjust the action current of error protection, this action current is generally adjusted to compressor M ₁Maximum allow 1.5 times of operating current to get final product.Start time delay resistance R ₂₄With startup delay capacitor C ₁₉Be that overcurrent when get rid of starting makes the action of memory electric current, this delay time is adjustable to the 1.5 times of triode Q of the longest start-up time under the normal condition ₁₂And Q ₁₃Connection be the controllable silicon equivalent circuit, also available controllable silicon replaces.

By thermistor R ₁₆, resistance R ₁₇, capacitor C ₁₂, diode D ₁₅The compressor M that forms ₁In the thermal-shutdown circuit, as compressor M ₁During excess temperature, place compressor M as sensor ₁On thermistor R ₁₆Resistance descends, thermistor R ₁₆And resistance R ₁₇The current potential of tie point raises, and its electric current is by diode D ₁₅, input triode Q ₅, make Q ₅Colelctor electrode from the high potential to the electronegative potential, compressor M ₁The out of service beginning lowered the temperature.Capacitor C ₁₂Act as and eliminate outside influence, diode D circuit ₁₅Effect be by the end of its anodal electric current, another effect is and the second reference level V ₃Carry out temperature-compensating.Diode D ₈₀Be used for cut-off current.

Available overvoltage crowbar in this circuit, under-voltage protecting circuit, power failure delay protection circuit are got rid of the compressor M that external cause causes ₁Overcurrent, get rid of the overcurrent that sensor is heated and causes by the temperature-sensitive delay circuit, by starting time delay resistance R ₂₄And startup delay capacitor C ₁₉Prevent from normally to start the action of the fault secure circuit that overcurrent causes, getting rid of compressor M by thermal-shutdown circuit ₁The damage that excess temperature causes can be protected compressor M in all cases effectively thereby eliminated traditional electrothermal relay protection ₁, make that its winding is unlikely to be burnt.

Often open knob QA ₁, normally closed knob TA ₁, resistance R ₂₇Be to shut down usefulness, make the unnecessary attaching plug that pulls out when shutting down, certainly, this circuit also can save not.When needs are shut down defrost, press and often open knob QA ₁, this moment light emitting diode D ₃₈Also luminous but light that send is not fault alarm, often open knob QA but press ₁Shutdown indication, after defrost finishes, press normally closed knob TA ₁Just start again.Each figure can design with reference to Fig. 1, Fig. 2, Fig. 3 as adding automatic heating circuit after this figure reached.Other symbol description is referring to Fig. 1 among the figure.

In Fig. 5 circuit by resistance R ₄₃Restriction bidirectional triode thyristor KS ₁Trigger current.Triode Q in the start-up circuit ₁₄The conducting amplification is after resistance R ₂₈Current limliting is again through triode Q ₁₅Conducting is amplified makes bidirectional triode thyristor KS ₃Connect compressor M ₁Start-up circuit, resistance R ₂₉Be restriction bidirectional triode thyristor KS ₃Trigger current, capacitor C ₂₀Be filtering usefulness, capacitor C ₁₅And resistance R ₄₅Be to bidirectional triode thyristor KS ₃Carry out resistance-capacitance protection, prevent high-voltage breakdown.This circuit is by bidirectional triode thyristor KS ₁And KS ₃Connecting main circuit can make whole refrigerator oncontacting reveal.Other symbol description is with reference to Fig. 1, Fig. 2, Fig. 4 among the figure.

Each symbol description is referring to previous figures in Fig. 6 circuit.

In Fig. 7 circuit by often opening knob QA ₄, resistance R ₁₂₇, R ₁₂₈, capacitor C ₂₁, FET Q ₅₉Form the quick-frozen circuit, by often opening knob QA ₄After, through resistance R ₁₂₇Give capacitor C ₂₁Charging, capacitor C ₂₁Anodal current potential raises FET Q ₅₉Conducting, the one end is connected resistance R with ground ₁₀On electric current input ground, compressor M ₁The row of not stopping transport is because resistance R ₁₂₈And capacitor C ₂₁Form the discharge delay circuit, constant resistance R ₁₂₈Give capacitor C ₂₁The field-effect pipe Q that delays time discharges ₅₉When ending, compressor M ₁Out of service, refrigeration stops, and changes capacitor C ₂₁And resistance R ₁₂₈Value can change the quick-frozen time.

Thermistor R among this figure ₁₃Be freezer temperature sensor.Work as K switch in the energy-saving run circuit ₂With potentiometer R ₁₂Termination when logical, the temperature of refrigerating chamber is controlled at the highest, K switch ₂While on-delay capacitor C ₂₂Prolong the startup-shutdown time, reach energy-saving run.Partly thaw and work as K switch in the circuit ₁Contact and resistance R ₁₈Termination when logical, the temperature of refrigerating chamber is-3 ℃, makes the food of putting into refrigerating chamber be in half thawed state, is convenient to cutter and cuts processing.As K switch in the gasifying type refrigerator ₁Available double-pole switch is connected box fan simultaneously and is made cold wind circulation by force in refrigerating chamber.

In the temperature of refrigerating chamber control circuit, thermistor R ₅₂Be refrigerator temperature sensor, positive negative temperature temperature control definite value resistance position device R ₅₁With positive negative temperature temperature control definite value potentiometer R among Fig. 1 ₁₂Illustrate identical, potentiometer R among the Yin Bentu ₁₂The control refrigerating chamber, the definite value temperature is lower limit, resistance R ₄₉, R ₅₀With resistance R in Fig. 1 circuit ₁₀, R ₁₁Illustrate identical.After temperature of refrigerating chamber raise, electric current can not be from positive negative temperature temperature definite value potentiometer R ₅₁Mid point through diode D ₃₉Input triode Q ₁₆Base stage, triode Q ₁₆End resistance R ₅₄On electric current input by triode CQ ₁₇, CQ ₁₈, CQ ₁₉The differential amplifier of forming, bidirectional triode thyristor KS ₄Add the negative pressure triggering and conducting, connect magnetic valves, make the refrigeration system of refrigerating chamber begin circulation after the magnetic valve energising by terminals 4, be lower than the definite value temperature to temperature of refrigerating chamber after, negative temperature temperature control definite value potentiometer R just ₅₁The current potential of mid point raises, and electric current is through diode D ₃₉Input triode Q ₁₆Resistance R ₅₄On electric current input ground, bidirectional triode thyristor KS ₄End, magnetic valve turn-offs the refrigerating circuit of refrigerating chamber, stops the refrigeration of refrigerating chamber.Only at compressor M ₁Bidirectional triode thyristor KS during start ₄The ability triggering and conducting is connected the refrigerating chamber refrigerating circuit with magnetic valve.Because triode Q when shutting down ₉Current collection high potential very, electric current is through resistance R ₄₈, diode D ₄₀Inject triode Q ₁₆Base stage, bidirectional triode thyristor KS ₄Can not triggering and conducting.

Triode Q among this figure ₂₀With Q among Fig. 2 ₉, Q ₂₁With Q among Fig. 2 ₁₀, diode D ₄₁With D among Fig. 2 ₃₃, feedback resistance R ₅₃With R among Fig. 1 ₃₃, resistance R ₅₅With R among Fig. 2 ₃₈R ₅₆With R among Fig. 2 ₃₇, R ₅₇With R among Fig. 2 ₄₀, R ₅₈With R among Fig. 2 ₄₁, R ₅₉With R among Fig. 2 ₃₉, capacitor C ₂₅With C among Fig. 2 ₁₇, C ₂₃With C among Fig. 1 ₁₁Illustrate identical.

Resistance R ₄₇Be restriction bidirectional triode thyristor KS ₄Trigger current, capacitor C ₁₆And resistance R ₄₆Be to bidirectional triode thyristor KS ₄Carry out resistance-capacitance protection, prevent high-voltage breakdown.As the refrigerating chamber temperature control in this circuit is partly removed, motor-driven system or the existing gasifying type cold compartment of refrigerator thermoregulating system of changing Figure 16 also can be used in the gasifying type refrigerator.Join as discord magnetic valve on terminals 4 and to change suitable drive mechanism and also can be used for the gasifying type refrigerator.Be used for the gasifying type refrigerator and often open knob QA ₁, normally closed knob TA ₁And resistance R ₂₇Shouldn't.Each circuit also can be with reference to this line design in the past.Other symbol description is referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5.

Fig. 8 to Figure 18 is the individual feature circuit, be with each circuit design of Fig. 1 to Fig. 7 together, satisfy the requirement of each model refrigerator of each producer.

Fig. 8 is the energy-conservation alternating current steady voltage plug circuit that has only boost function.1 is connected to electrical network, V mutually among terminals 1 and Fig. 1 to 7 ₁And V among Fig. 1-7 ₁Join V ₂And Fig. 1-7V ₂Join V ₃And V among Fig. 1-7 ₃Join, 5 and 6 receive circuit to compressor M ₁The termination on.When line voltage reduces in the voltage detecting circuit by resistance R ₆₀, R ₆₁R in the current potential ₆₂The voltage that the divider of forming is told descends, triode Q ₂₂End resistance R ₆₅On electric current input by triode CQ ₂₃, CQ ₂₄, CQ ₂₅The differential amplifier of forming is making relay J after the electric current amplification ₄Adhesive, its normally opened contact J after the adhesive _4-2Connect transformer B ₂Tap make its work, its normally-closed contact J _4-1Disconnect, make transformer B ₂Send into compressor M after boosting ₁When line voltage just often, voltage that divider is told raises, electric current is through diode D ₄₂Input triode Q ₂₂Resistance R ₆₅On electric current can not import triode CQ ₂₃, CQ ₂₄, CQ ₂₅The differential amplifier of forming, relay J ₄Can not its normally opened contact of adhesive J _4-2Cut off transformer B ₂Active line, power supply is without transformer B ₂By relay J ₄Normally-closed contact J _4-1Directly insert compressor M ₁Adjust feedback resistance R ₆₃Make relay J ₄Not at all actions frequently of voltage critical point, diode D ₂₀Be to eliminate relay J ₄The high pressure that coil produces, capacitor C ₂₇Be at triode Q ₂₂The unlikely input of electric current is by triode CQ during the half-wave conducting ₂₃, CQ ₂₄, CQ ₂₅The differential amplifier resistance R of forming ₆₆Be current-limiting resistance, diode D ₄₂Effect be and triode Q ₂₂Base stage to emitter stage together with the second reference level V ₃Constitute temperature-compensating, another effect is blocking capacitor C ₂₆The voltage that keeps.In mains supply, the ratio of the crest voltage of industrial-frequency alternating current and mean value voltage is the amount of a change, is not absolute $\sqrt{2}$ Relation doubly is for the precision that improves this voltage detecting circuit detection mean value voltage has increased capacitor C ₂₆And resistance R ₆₄, the influence that the ratio that ought not be subjected to temperature and crest voltage and mean value voltage substantially of this circuit adjustment changes.This voltage-stabilized power supply can improve 4 times than existing refrigerator external power supply energy-saving effect, because the main consuming components transformer B of voltage-stabilized power supply ₂At freezer compressor M ₁Do not work when not starting shooting.Line voltage is not just often worked.

Fig. 9 has to boost and the energy-conservation alternating current steady voltage plug circuit of falling-rising function, when line voltage is too high, in the voltage detecting circuit by resistance R ₆₇, R ₆₈Potentiometer R ₆₉The overtension that the divider of forming is told, electric current is through diode D ₄₃Injection is by triode CQ ₂₆, CQ ₂₇CQ ₂₈The differential amplifier of forming, relay J ₅Adhesive, electric current is through diode D ₄₄Potentiometer R ₆₂Midpoint potential lowers, relay J ₄Also its normally-closed contact of adhesive J _4-1Disconnect normally opened contact J _4-2Adhesive makes transformer B ₂Start working relay J ₅Its normally-closed contact J after the adhesive _5-1Disconnect normally opened contact J _5-2Adhesive conversion transformer B ₂Tap down resistance R ₇₁, R ₇₂Be current-limiting resistance, capacitor C ₂₉For filtering with make relay J ₅At the not all frequently action diode D of voltage critical point ₂₁It is anti-relay J ₅Produce high pressure, diode D ₄₃, resistance R ₇₀, capacitor C ₂₈With diode D among Fig. 8 ₄₂, resistance R ₆₄Capacitor C ₂₆Illustrate identically, other symbol description is referring to Fig. 8.

Figure 10 is for blowing the electric leakage safety circuit of fuse, V with the relay contact short circuit ₁And V among Fig. 1-7 ₁Join V ₃And V among Fig. 1-7 ₃Join, terminals 1 hot terminal 2 zero line that gets access to grid that gets access to grid, terminals 7 insert outcase of refrigerator, and when outcase of refrigerator had electricity, power connection end 7 had voltage, through resistance R ₇₄, R ₇₅, diode D ₄₅And resistance R ₇₆Input is by triode CQ after the divider dividing potential drop of forming ₂₉, CQ ₃₀, CQ ₃₁The differential amplifier of forming, relay J ₆Adhesive, its normally opened contact J _6-1Through resistance R ₇₃Fuse RD is burnt after the current limliting, live wire is cut off, and has guaranteed personal safety.Resistance R ₇₄, R ₇₅With diode D ₄₅Be for preventing that the anti-casing generation of zero-power line and live wire is worked as zero line to the adventurous electric current of human body and live wire connects the inverse time resistance R ₇₄, R ₇₅The resistance sum is as being 220K, can arrive 1 milliampere to the electric current of casing, adds diode D ₄₅After-current has only 0.5 milliampere, and human body sensory is very little, with two resistance R ₇₄, R ₇₅Serial connection can connect the reliability that improves circuit inverse time at live wire and zero line.Resistance R ₇₇, R ₇₈Be current-limiting resistance, diode D ₂₂It is anti-relay J ₆Produce high pressure, capacitor C ₁₃, C ₄₂Be anti-circuit erroneous action, capacitor C ₃₀Be filtering usefulness, also can drive dropout switch dropout outage security personnel if need not burn the method for fuse.

Figure 11 is for using bidirectional triode thyristor KS ₅Make power supply short circuit blow the electric leakage safety circuit of fuse, replace bidirectional triode thyristor KS with common controllable silicon ₅Also can, capacitor C ₃₀Shouldn't.Resistance R ₇₉For restriction triggers bidirectional triode thyristor KS ₅Electric current usefulness, other symbol description is referring to Figure 10.

Figure 12 triggers bidirectional triode thyristor KS with negative pressure ₅The electric leakage safety circuit of conducting, other symbol is referring to Figure 10, Figure 11.The electric leakage safety circuit also can be with reference to Figure 19 and Figure 20 design, makes relay adhesive or controllable silicon conducting blow fuse and ensure public security with memory circuit after electric leakage.

Figure 13 is the circuit with light emitting diode indication refrigerating chamber and freezer temperature, among the figure at transformer B ₁On increase a secondary coil L again, through diode D ₈, D ₉Rectification, capacitor C ₅After the filtering to the light emitting diode D that shows as temperature ₄₇Working power is provided.V ₂And V among Fig. 1-7 ₂Join voltage-stabiliser tube D ₅₃Provide the reference level of native system, by resistance R ₈₀To voltage-stabiliser tube D ₅₃Input current makes work more stable, as the thermistor R of temperature sensor ₈₃Be put in freezer compartment of refrigerator and the refrigerating chamber, when temperature arrives potentiometer R ₈₂The definite value temperature after this potentiometer and resistance R ₈₁Thermistor R ₈₃The bleeder circuit of forming makes potentiometer R ₈₂The current potential rising electric current input compositing amplification tube Q of mid point _32-33, conducting is after resistance R ₈₄Current limliting makes light emitting diode D ₄₇Luminous demonstration the temperature inside the box, potentiometer R ₈₂In the figure in 1,2,3,4,5,6 definite value each is different, its displays temperature is also different, top 6 thermistor R ₈₃Be put in refrigerating chamber and the refrigerating chamber its light emitting diode D respectively ₄₇Show the different temperatures in refrigerating chamber and the refrigerating chamber respectively, drawn 6 same circuit among this figure,, also can establish several more or establish several same circuit, compositing amplification tube Q less with 6 kinds of temperature of 6 diode displaying _32-33Just in time with voltage-stabiliser tube D ₅₃Constitute temperature-compensating, make luminous demonstration not be subjected to the room temperature variable effect substantially

Though above established several temperature sensors that become by common temperature-sensitive resistor group more, cost is not high, and circuit is adjusted well, luminous demonstration is accurate.

Figure 14 is the overlong time warning circuit that opens the door, among the figure terminals 9 and 11 and electrical network join, after refrigerating-chamber door is opened, the refrigerating chamber K switch ₃Closed case intraoral illumination lamp ZD is bright, through diode D ₅₄Rectification, resistance R ₁₀₅Step-down, voltage-stabiliser tube D ₅₆Voltage stabilizing, capacitor C ₃₁Provide working power to circuit after the filtering, behind the power connection by resistance R ₁₀₆To capacitor C ₃₂The charging time-delay, when the overlong time time-delay of opening the door surpasses regularly, resistance R ₁₀₇, R ₁₀₈, R ₁₀₉, capacitor C ₃₃, unijunction transistor Q ₄₄, triode Q ₄₅The concussion amplifying circuit of forming is started working, and closes chamber door by the loudspeaker Y warning reminding of sounding.After refrigerating chamber opens the door, the refrigerating chamber K switch ₄Closure is through diode D ₅₅Rectification just repeats above-described action.After any one door of refrigerating chamber or refrigerating chamber is opened, through K switch ₃And K ₄Fan electromotor M is turn-offed in the capital ₂, as be used for direct cooling refrigerator, because of no fan motor M ₂The refrigerating chamber switch only needs a normally opened contact and diode D ₅₅Join, for simple gate refrigerator, K switch ₄With diode D ₅₅All can save.This figure circuit is independent decompression rectification power, can set up wiring board and install.

Figure 15 designs resistance R for the precision of over-voltage detection circuit and undervoltage detection circuit among raising Fig. 1 to Fig. 7 ₁₁₀, R ₁₁₁With R among Fig. 8 ₆₄Effect identical, capacitor C ₃₄, C ₃₅With C among Fig. 8 ₂₆Effect identical, diode D ₁₀, D ₁₁Remove and voltage-stabiliser tube D ₁₂Constitute temperature compensation function and keep capacitor C outward in addition ₃₄, C ₃₅The effect of voltage, V ₃And Fig. 1-7V ₃Join, if the ratio of nationwide integrated power grid crest voltage and virtual value voltage change not the university degree circuit shouldn't, other symbol description is referring to Fig. 1.

To be the gasifying type refrigerator drive the temperature-control circuit of air door with motor to Figure 16, among the figure after the indoor temperature of refrigerator cold-storage is higher than the definite value temperature, as the thermistor R of sensor ₁₁₅Resistance reduces by resistance R ₁₁₂, positive negative temperature temperature control definite value potentiometer R ₁₁₄, thermistor R ₁₁₅The divider of forming makes positive negative temperature temperature control definite value potentiometer R ₁₁₄The current potential of mid point descends, and electric current can not be through compensation diode D ₅₇Input triode Q ₄₆, so resistance R ₁₁₇On electric current input by triode CQ ₄₇, CQ ₄₈, CQ ₄₉The differential amplifier of forming makes relay J ₇Adhesive, its normally opened contact makes resistance R ₁₂₀On electric current input triode CQ ₅₃, triode Q ₅₃The while is by resistance R after the conducting ₁₂₂Current limliting makes triode Q ₅₂Also conducting, at this moment, direct current generator M ₃Power line begins just to change after voltage is arranged, because direct current generator M ₃Link to each other with air door by transmission mechanism, drive air door and open and begin refrigeration, after air door is opened entirely automatically often opening knob QA ₂On the top resistance R ₁₂₀On electric current input ground, triode Q ₅₃Turn-off direct current generator M ₃Stall.Have only after temperature in the refrigerator is lower than the definite value temperature because thermistor R ₁₁₅It is big that resistance becomes, and electric current is through compensation diode D ₅₇Input triode Q ₄₆, triode CQ ₄₇CQ ₄₈, CQ ₄₉The differential amplifier of forming just ends relay J ₇Just discharge resistance R ₁₂₀On electric current could be through diode D ₅₈Input triode Q ₅₁Make its conducting, simultaneously, by resistance R ₁₂₁Current limliting makes triode Q ₅₀Conducting, direct current generator M ₃Counter-rotating drives air door and closes, stops refrigeration, after air door is closed entirely, automatically normally closed toggle TA ₂Cut off circuit, direct current generator M on the top ₃Stall, promptly perseveration reaches constant temperature purpose in the case, diode D like this ₅₈Effect be in relay J ₇Do not make electric current input triode Q during adhesive ₅₁

Positive negative temperature temperature control definite value potentiometer R among this figure ₁₁₄With R among Fig. 1 ₁₂, feedback resistance R ₁₁₆With R among Fig. 1 ₃₃Resistance R ₁₁₁With R among Fig. 1 ₁₁, R ₁₁₉With R among Fig. 1 ₃₅, capacitor C ₃₆In Fig. 1 ₁₁The C explanation is identical, resistance R ₁₁₈Be current-limiting resistance, capacitor C ₃₇Effect be and diode D ₆₁, D ₆₂, D ₆₃, D ₆₄Cooperate anti-direct current generator M ₃Triode is punctured diode D ₅₉Be to cooperate triode Q ₅₂With triode Q ₅₃Conducting synchronously, diode D ₆₀Be to cooperate triode Q ₅₀With triode Q ₅₁Conducting synchronously.Diode D ₂₃It is anti-relay J ₇The high pressure that produces.V among the figure ₁And V among Fig. 1-7 ₁Join V ₂And V among Fig. 1-7 ₂Join V ₃And V among Fig. 1-7 ₃Join, terminals 12 and 13 insert direct current generator M ₃Working power, the required electric current of Yin Mada is big, this circuit will partly separate with other local filtering.

Figure 17 is the direct cooling refrigerator automatic reset circuit that manually defrosts, among the figure when refrigerator need defrost hand click and often open knob QA ₃After-current is through resistance R ₁₂₆Current limliting triggers controllable silicon KP ₁Conducting, relay J ₈Adhesive utilizes its normally opened contact to connect heater and begins defrost, after being heated to uniform temperature, as the thermistor R of sensor ₁₂₄Resistance diminishes and makes and resistance R ₁₂₃The current potential of tie point descends, and electric current can not be through compensation diode D ₆₅Input is by triode CQ ₅₄CQ ₅₅, CQ ₅₆The differential amplifier of forming, differential amplifier ends, and causes relay J after ending ₈Discharge, defrost finishes and has recovered normal refrigeration.When the people clicks normally closed knob TA when stopping defrost ₃Get final product.Light emitting diode D during defrost ₆₇Luminous demonstration is because through diode D ₆₆By triode CQ among tie point 14 and Fig. 1-7 ₆Base stage link to each other compressor M during defrost ₁Stop refrigeration immediately.V among this figure ₁And V among Fig. 1-7 ₁Join V ₂And V among Fig. 1-7 ₂Join V ₃And V among Fig. 1-7 ₃Join resistance R ₁₂₅Be current-limiting resistance, diode D ₂₄Be anti-relay J ₈Produce high pressure, the function of this circuit is the same with the manual defrost function of the Japanese GR204E of Toshiba refrigerator, but circuit greatly simplifies.Behind this circuit, often open knob QA among Fig. 4-7 ₁, normally closed knob TA ₁, resistance R ₂₇Shouldn't.During defrost as without heater, relay J ₈With diode D ₂₄Shouldn't.

Figure 18 is the timing automatic defrosting circuit, is used for the gasifying type refrigerator, by binary counter to compressor M ₁The timing of working time accumulative total, regularly give controllable silicon KP to one from terminals 15 ₁A trigger impulse makes its conducting defrost, two advance to count automatic defrosting be prior art this be not quite clear introduction, other symbol description is referring to Figure 17 among this figure.

Figure 19 adds the circuit of electrical network overvoltage, under-voltage, power failure, refrigerator earth leakage protective device for refrigerator, by capacitor C ₃₉, C ₄₀Anti-triode Q ₅₇And Q ₅₈The memory circuit misoperation of forming is resistance R after the refrigerator electric leakage ₇₆With diode D ₄₅The current potential of tie point raises and makes by triode Q ₅₇Q ₅₈The eternal conducting of forming of memory circuit, light emitting diode D ₆₈Send leakage-current alarm, simultaneously triode CQ ₇Collector potential lowers, and makes electric current input ground, relay J ₁Discharge its normally opened contact J _1-1The live wire of cutting off the electricity supply is guaranteed personal safety.Terminals 16 and 17 connect the refrigerator plug, terminals 7 plug ground wires, terminals 1 live wire that gets access to grid, terminals 2 zero line that gets access to grid.In the power failure delay circuit by resistance R ₃₄Through relay J ₁Normally-closed contact J _1-2Give capacitor C ₉Relay J is worked as in charging ₁After the time-delay adhesive, its normally-closed contact J _1-2Disconnect normally opened contact J _1-3Delay capacitor C is given in the closed loop of forming ₉Discharge is with each time-delay next time.Triode Q ₅₇, Q ₅₈Be the controllable silicon equivalent circuit, available controllable silicon replaces.Other symbol description is referring to Fig. 1, Figure 10.

Figure 20 is many own error protections of refrigerator on Figure 19,, warning function add the protector circuit, after the refrigerator electric leakage by diode D ₄₆Electric current is imported by triode Q ₁₂, Q ₁₃The memory circuit of forming makes light emitting diode D ₃₈Send the fault alarm of refrigerator own, simultaneously triode CQ ₇The collector potential relay J that lowers ₁Discharge its normally opened contact J _1-1The live wire of cutting off the electricity supply guarantees personal safety.The power failure delay circuit of this figure also can be with reference to Figure 19 design capacitance C ₄₁It is anti-memory circuit misoperation.Other symbol description is referring to Fig. 1, Fig. 4, Figure 10 Figure 19.With the refrigerator protector that Figure 19 and Figure 20 make, the protection that can be used for current refrigerator has the advantage that performance is good, cost is low, function is many.

The Electronic Control of refrigerator is the inevitable direction of refrigerator development, and can prevail over competition because it have many good qualities such as: the user is easy to use, and external structure is attractive in appearance, is suitable for China's various places condition of power supply, multiple functional, reliable operation, security of operation, energy-conservation. This circuit designs according to like this situation just, and more function, lower cost are arranged, and has many accompanying drawings to be fit to the needs of each various refrigerator of producer, makes its product obtain liking of user and wins the market.

Claims (10)

1, a kind of electronic control circuit for refrigerator is characterized in that:

(1) control of refrigerator all is made up of electronic circuit;

(2) main circuit is by bidirectional triode thyristor KS ₁And KS ₃Connection is revealed whole refrigerator oncontacting

(3) in the circuit by the output V of voltage-stablizer W ₂Provide first reference level to circuit; By voltage-stabiliser tube D ₁₂An end V ₃Provide second reference level to circuit;

(4) working power of control circuit is passed through capacitor C ₁Be connected to electrical network and make the power supply decompression capacitor

(5) electrical network transient fluctuation holding circuit adopts capacitor C ₈Be connected to diode D ₁₆

(6) temperature-sensitive power failure delay circuit adopts resistance R ₃₄Through FET Q ₁₁Or relay J ₁Normally-closed contact J _1-2With delay capacitor C ₉Be connected to form delay capacitor C ₉Charging circuit; Delay capacitor C ₉Through diode D ₃₂And resistance R ₃₆Compose in series the loop or by relay J ₁Normally opened contact J _1-3With delay capacitor C ₉Form the loop discharge.

(7) compressor M ₁Thermal-shutdown circuit adopt sensor R ₁₆Be put in compressor M ₁Go up and be connected with resistance R ₁₇, capacitor C ₁₂With diode D ₁₅

(8) the quick-frozen circuit adopts resistance R ₁₂₈And capacitor C ₂₁Form the discharge delay circuit, discharge delay circuit and FET Q ₅₉An end join FET Q ₅₉The other end be connected with ground;

(9) circuit that partly thaws adopts K switch ₁Contact and resistance R ₁₈An end join;

(10) the energy-saving run circuit adopts K switch ₂With potentiometer R ₁₂An end join delay capacitor C ₂₂Prolong the startup-shutdown time by K switch ₂Control;

(11) the overlong time warning circuit that opens the door adopts K switch ₃The closed diode D that connects ₅₄Rectification.K switch ₄The closed diode D that connects ₅₅Rectification;

(12) differential amplifier of forming by triode CQ in each circuit;

(13) temperature-control circuit is arranged; Automatic heating circuit; Overvoltage and under-voltage protecting circuit error protection start-up circuit; Energy-conservation alternating current steady voltage plug circuit; The speed of bidirectional triode thyristor is led the quick-break circuit, electric leakage safety circuit, temperature display circuit; The defrost circuit.

2,, it is characterized in that said temperature-control circuit adopts positive negative temperature control definite value potentiometer R according to the described electronic control circuit for refrigerator of claims ₁₂, R ₅₁, R ₁₁₄, the mid point of these three potentiometers respectively with diode D ₁₃, D ₃₉, D ₅₇And feedback resistance R ₃₃, R ₅₃, R ₁₁₆Connect diode D ₁₃, D ₃₉, D ₅₇Negative pole respectively with triode Q ₅, Q ₁₆Q ₄₆Connect; Direct current generator M ₃Be to link to each other with air door by transmission mechanism, direct current generator M ₃Power line respectively with diode D ₅₉, D ₆₀And triode Q ₅₀, Q ₅₁, Q ₅₂, Q ₅₃Connect; Triode Q ₅₁, Q ₅₃Base stage respectively with knob TA ₂, QA ₂Connect, again with diode D ₅₈And relay J ₇Connect.

3, electronic control circuit for refrigerator according to claim 1 is characterized in that said automatic heating circuit is by sensor R ₈And resistance R ₇Connect to form divider, by relay J ₂Normally opened contact J _2-1Or bidirectional triode thyristor KS ₂Be connected with heater.

4, electronic control circuit for refrigerator according to claim 1 is characterized in that said overvoltage and under-voltage protecting circuit adopt resistance R ₁R ₄An end be connected triode Q with electrical network ₄Base stage and resistance R ₁₁₀, capacitor C ₃₄, diode D ₁₀Connect its colelctor electrode and capacitor C ₆Connect; Triode Q ₅Base stage and resistance R ₁₁₁, capacitor C ₃₅, diode D ₁₁Connect its colelctor electrode and capacitor C ₇Connect.

5, electronic control circuit for refrigerator according to claim 1 is characterized in that said error protection start-up circuit adopts sample resistance R ₁₉, R ₂₀Be connected sample resistance R with electrical network ₁₉, commutation diode D ₃₅, Zener diode D ₃₆, D ₃₇, filter capacitor C ₁₈, divider resistance R ₂₂, R ₂₃, start time delay resistance R ₂₄Start delay capacitor C ₁₉, triode Q ₁₂, Q ₁₃Interconnect.Sample resistance R ₂₀With amplifying triode Q ₁₄, Q ₁₅Connect, by relay J ₃Normally opened contact J _3-1Or bidirectional triode thyristor KS ₃With compressor M ₁Start-up circuit join.

6, electronic control circuit for refrigerator according to claim 1; The terminals 1 that it is characterized in that said energy-conservation alternating current steady voltage plug circuit are connected with electrical network, triode Q ₂₂Base stage and resistance R ₆₄, capacitor C ₂₆, diode D ₄₂Connect triode CQ ₂₆Base stage and resistance R ₇₀, capacitor C ₂₈, diode D ₄₃Connect potentiometer R ₆₂Mid point and feedback resistance R ₆₃Connect triode Q ₂₂Colelctor electrode and capacitor C ₂₇Connect relay J ₄Normally opened contact J _4-2Just often cut off transformer B at line voltage ₂Active line make at line voltage transformer B just often ₂Do not work relay J ₄Normally-closed contact J _4-1At line voltage compressor M just often ₁Without transformer B ₂Directly be connected to power supply, transformer B ₂Tap respectively and relay J ₄, J ₅Contact and compressor M ₁Join.

7, electronic control circuit for refrigerator according to claim 1 is characterized in that said bidirectional triode thyristor speed leads the quick-break circuit and adopt resistance R ₃₉With triode Q ₉Join triode Q ₉Colelctor electrode and FET Q ₁₁, resistance R ₃₈, feedback resistance R ₃₃Connect triode Q ₁₀Base stage and current-limiting resistance R ₄₀Connect emitter stage and capacitor C ₁₇, diode D ₃₃Resistance R ₄₁Connect colelctor electrode and diode D ₃₁Connect; Resistance R ₅₉With triode Q ₂₀Join triode Q ₂₀Colelctor electrode and resistance R ₅₅, feedback resistance R ₅₃Connect triode Q ₂₁Base stage and current-limiting resistance R ₅₇Connect emitter stage and capacitor C ₂₅, diode D ₄₁, resistance R ₅₈Connect colelctor electrode and resistance R ₅₄Connect.

8, electronic control circuit for refrigerator according to claim 1 is characterized in that terminals 7 are connected to outer case of refrigerator in the said electric leakage safety circuit, the terminals 1 live wire current-limiting resistance R that gets access to grid ₇₃Succeed electrical equipment J ₆Normally opened contact J _6-1Or bidirectional triode thyristor KS ₅, by resistance R ₇₄, R ₇₅, R ₇₆, diode D ₄₅Form divider, triode CQ ₂₉Base stage and capacitor C ₁₃, C ₄₂Connect triode Q ₅₈Base stage and capacitor C ₃₉, C ₄₀Connect triode Q ₁₂Base stage and capacitor C ₁₉, C ₄₁Connect triode Q ₅₇, Q ₅₈Form memory circuit and join triode Q with ground ₁₂, Q ₁₃Forming memory circuit joins with ground.

9, electronic control circuit for refrigerator according to claim 1 is characterized in that said temperature display circuit is by voltage-stabiliser tube D ₅₃Reference level is provided, a plurality of sensor R are arranged ₈₃

10, electronic control circuit for refrigerator according to claim 1 is characterized in that said defrost circuit adopts controllable silicon KP ₁With triode CQ ₅₆Serial connection, triode CQ ₅₄With compensation diode D ₆₅Connect.

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