CN2055995U - Electrical appliance time delay protection system with selectable capacity - Google Patents

Abstract

The utility model discloses an electrical appliance time delay protection system with selectable capacity, which can select short time power failure to do the time delay protection for the electrical appliances such as the refrigerators, the air-conditioners, etc. The electrical appliance time delay protection system with selectable capacity eliminates the side effect of time delay power on when just power on and after power failure for a long time, and provides a mature technique for the time delay protection of the television. A push-button switch K1 which is used for adjusting the temperature, a temperature controller which is used for adjusting the refrigerators and the air-conditioners are designed, and the energy-saving AC regulated voltage part can save two times energy than the prior art.

Description

Electrical appliance time delay protection system with selectable capacity

The utility model belongs to electronic technology, is mainly used in refrigerator, air conditioner, the television set, and also can be used for having a power failure in short-term needs down in other electrical equipment of delay protection.

Existing refrigerator needs delay protection under having a power failure in short-term; in the circuit that overvoltage and under-voltage protection are arranged, need delay protection after overvoltage and the under voltage protection in short-term during to normal voltage; now commercially available protector (as the BH-8 type voltage stabilizing delay protection device of Foshan production) not only has the delay protection effect in these cases; and on rigidly connecting during power supply and long-time back and the long-time overvoltage of having a power failure; the side effect of time-delay energized is all arranged after the under voltage protection, and these time-lag actions that need not have influenced the operate as normal of electrical equipment.Existing refrigerator protector does not all have adjusts the temperature switch switch, often makes when making people adjust thermostat in the refrigerator to start shooting immediately after the compressor shutdown and cause overload.

The purpose of this utility model is to overcome above shortcoming, designs a kind of better new product of using.

Feature of the present utility model is that design has the selection delay protection circuit that has a power failure in short-term, as be used for having, the protector of under voltage protection also has and selects the function of overvoltage and under voltage delay protection in short-term, as be used for electronic temperature control device in the refrigerator function of selecting compressor temporary stoppage delay protection is also arranged, as be used for television set and also provide ripe possible technique for the delay protection of television set; Also designing in the circuit has the temperature switch of adjustment K switch 1, makes it arbitrarily to adjust at any time the thermostat of refrigerator and air conditioner.

Fig. 1 is the circuit diagram that has the two function and protecting devices of " selecting to have a power failure in short-term the delay protection circuit " and " adjusting the temperature switch switch ".

Fig. 2 is only with the circuit diagram of the relay of a normally opened contact, and function and Fig. 1 are same.

Fig. 3 is for having " selecting to have a power failure in short-term the delay protection circuit " and the voltage stabilizing of " energy-conservation AC voltage-stabilizing circuit ", the circuit diagram of delay protection device.

Fig. 4 is the circuit diagram of the 6 function and protecting devices that have " the delay protection circuit of selecting to have a power failure is in short-term adjusted temperature and pressed switch, overvoltage crowbar, under-voltage protecting circuit, current foldback circuit, leakage protection circuit ".

Among Fig. 1 by input terminal 1 and 2 and electrical network join, by resistance R ₁R ₂, R ₃, decompression capacitor C1, filter capacitor C ₂, rectifier diode D _1-4, power supply shows light-emitting diode D ₅, voltage stabilizing didoe D ₆Form power circuit, resistance R ₁With decompression capacitor C ₁Serial connection is some phenomenons in the AC network such as anti-switch and the components and parts that cause damage and the instability of line work, and the sparking when also anti-and AC network is joined is excessive, and power supply shows light-emitting diode D ₅Positive pole be connected to filter capacitor C ₂Absorb overcurrent when making energized and do not damage this light-emitting diode, negative pole is connected to voltage stabilizing didoe D ₆Make this light-emitting diode luminance stable, line work does not change its brightness.

In order to reach when rigidly connecting power supply and the long-time back that has a power failure does not have the effect of time-delay energized, by resistance R ₄Discharge time delay resistance R ₅, discharge delay capacitor C ₃, blocking diode D ₇, relay J ₁Normally opened contact J _1-2Normally-closed contact J _1-3, triode Q ₁The delay protection circuit of form selecting to have a power failure in short-term, on rigidly connecting during power supply and behind long-time the power failure, resistance R ₆On electric current be input to triode Q ₂, relay J ₁Adhesive, its normally opened contact J _1-1Connect main circuit, outlet terminal 3 and 4 presents voltage, makes protected electrical work, and output simultaneously shows light-emitting diode D ₉Luminous demonstration.Relay J ₁After the adhesive, its normally opened contact J _1-2Give discharge delay capacitor C ₃Charging, current potential is by blocking diode D ₇Kept, behind long-time the power failure, discharge delay capacitor C ₃On electricity through relay J ₁Normally-closed contact J _1-3With discharge time delay resistance R ₅Put.Incoming call back relay J ₁Adhesive immediately has a power failure in this way in short-term, discharge time delay resistance R ₅On electric current continue to input to triode Q ₁Resistance R ₆On electric current be input to ground, relay J ₁Can not adhesive, could adhesive when having only to delay adjustments, so just reached the function of the delay protection of selecting to have a power failure in short-term.

The thermostat of adjusting in refrigerator and the air conditioner can carry out at any time from cold spot tuning focus; as from focus tuning cold spot being difficult operation; must shut down and carry out after three minutes; because compressor sound is less; whether difficulty is told running and is still shut down or shut down greater than three minutes, adjusts the temperature switch K switch so this device has designed one ₁, when need are adjusted temperature, click this switch, relay J ₁Discharge, just can arbitrarily adjust control temperature, adjusted temperature relay J then ₁Automatically adhesive has prevented the overload of transferring thermostat to cause, should adjust also available other the various forms of switches of temperature push-button switch certainly and replace.Diode D ₈Be to eliminate relay J ₁The high pressure that coil produces.

Resistance R among Fig. 2 ₁₀Be attempted by triode Q ₄Base stage and emitter on, resistance R ₈Be attempted by triode Q ₃Base stage and emitter on, work as relay J ₁Resistance R before the adhesive ₁₀Terminal voltage raises, triode Q ₄Elder generation's conducting makes electric current can not import triode Q ₁, constant resistance R ₈Terminal voltage raises, triode Q ₃Discharge delay capacitor C is given in back conducting ₃Charging has so just replaced Fig. 1 repeat circuit J ₁A normally opened contact and a normally-closed contact, resistance R ₇Be triode Q ₃Bleeder resistance, resistance R ₈, R ₉Be the dividing potential drop relation, under certain electric current, make triode Q ₃Conducting, other symbol description is referring to Fig. 1 among this figure.

The operation principle of the energy-conservation AC voltage-stabilizing circuit of Fig. 3 is just often to use relay J at line voltage ₃Normally opened contact J _3-2The working power of main power consumption device transformer B is cut off, thereby is economized on electricity about one times, when voltage is high or low by relay J ₃Connect transformer B voltage stabilizing.In the power circuit by voltage stabilizing didoe D ₆And D ₁₀Serial connection provides two level A and B to circuit, and power supply shows light-emitting diode D ₁₁String has current-limiting resistance R ₁₆, also be voltage stabilizing didoe D simultaneously ₁₀Shunting.

When line voltage hangs down, by resistance R ₁₁, R ₁₃Potentiometer R ₁₂The voltage that the voltage divider of forming is told reduces, when being lower than level B point, and triode Q ₅End resistance R ₁₄Electric current make triode Q ₆, Q ₇Conducting, relay J ₃Adhesive, its normally opened contact J _3-2Adhesive, normally-closed contact J _3-1Disconnect, transformer B-source line is connected, and boosts to outlet terminal 3 and 4.

When line voltage was high, the voltage that the voltage divider of being made up of resistance R 17, R19 potentiometer R18 is told raise, when being higher than level B, and triode Q ₈, Q ₉, Q ₁₀Conducting simultaneously, relay J 2 adhesives, its normally opened contact J _2-3Make also adhesive of relay J 3, the power line of transformer B is connected, by relay J ₂Normally opened contact J _2-1With normally-closed contact J _2-2Gear shift is depressured to outlet terminal 3 and 4.

Resistance R ₁₅And R ₂₂Be feedback resistance, be anti-relay J ₂, J ₃In all actions frequently of voltage critical point, be 200 volts as the relay pick-up voltage, release voltage is 195 volts, the value of adjusting feedback resistance can change the poor of adhesive and release voltage.Capacitor C ₄, C ₅Be under the half-wave conducting, to make its operate as normal.Resistance R ₁₄, R ₂₁, R ₂₃For current limliting is used.Resistance R ₂₀Be bleeder resistance.Diode D ₁₂, D ₁₃Be that anti-relay coil produces high pressure.Other symbol description is referring to Fig. 1 Fig. 2 among this figure.

The selection of Fig. 4 delay protection circuit that has a power failure is in short-term selected overvoltage in short-term in addition, the function of delay protection after the under voltage protection, as with reference to this figure at triode Q ₁₂Several inputs of base stage add a temperature control input again, can do the thermostat in refrigerator and the air conditioner, and the selection of this moment delay protection circuit that has a power failure is in short-term selected the function of compressor temporary stoppage delay protection in addition.

Resistance R when under-voltage ₁₁, R ₁₃The voltage that the voltage divider that potentiometer R12 forms is told is lower than level B point voltage, triode Q ₁₁End,, the electric current on the resistance R 24 is through diode D ₁₅Make the under-voltage protection input electric current is input to triode Q ₁₂, its current collection is low level very.

During overvoltage by resistance R ₁₇, R ₁₉Potentiometer R ₁₈The voltage that the voltage divider of forming is told is higher than the B point voltage, diode D ₁₄Make the overvoltage protection input electric current is input to triode Q ₁₂, its current collection is low level very.

When having a power failure in short-term, diode D ₁₆Doing in short-term, the power-failure protecting input is input to triode Q to electric current ₁₂, its current collection is low level very.

Only just often at line voltage, under the non-power failure in short-term, triode Q ₁₂Just end, the electric current on the resistance R 25 just makes triode Q ₂, Q ₁₃Conducting, relay J ₁Just adhesive.Overvoltage/undervoltage often has moment in the electrical network, and for making protected electrical equipment moment mistake, the under-voltage power supply that is not cut off down can operate as normal, by capacitor C ₈, resistance R ₂₆, diode D ₁₇, discharge diode D ₁₈Form the moment mistake, under-voltage holding circuit, moment mistake, under-voltage back triode Q ₁₂Current collection low level very, capacitor C ₈On electricity still can keep relay J ₁Adhesive a period of time, guarantee the moment mistake, under-voltage operate as normal.Discharge diode D ₁₈Be rapidly capacitor C after power failure ₈On tele-release fall, for the selection down that guarantees to have a power failure in short-term has a power failure the delay protection circuit in short-term can operate as normal.Capacitor C ₆, C ₇Effect be to guarantee that overvoltage and under-voltage protection can operate as normal under half-wave.

In leakage protection circuit and the current foldback circuit, triode Q ₁₄, Q ₁₅Form memory circuit, trigger and open back conducting forever, supply voltage is dropped to zero substantially, relay J ₁Discharge, play a protective role, simultaneous faults shows light-emitting diode D ₁₉Luminous warning.The earth leakage protective terminals 5 that join with refrigerator and air conditioner casing when electric leakage back present voltage (input terminal 1 must start to exchange fire line ability operate as normal), by resistance R ₃₂, R ₃₄R ₃₅Dividing potential drop is after diode D ₂₀Trigger the memory circuit conducting, relay J ₁Release plays a protective role.Resistance R ₂₈, R ₂₉, R ₃₀, R ₃₁, R ₃₃Capacitor C ₉, C ₁₀, C ₁₁, diode D ₂₁, D ₂₂, D ₂₃Form current foldback circuit, behind the overcurrent, trigger the memory circuit conducting, make relay J ₁Discharge, play a protective role.Resistance R ₂₇For current limliting is used.Other symbol description is referring to previous figures among this figure.

Do not influence the operate as normal of protected electrical equipment with this technology, eliminated the side effect of existing protector.After people recognize this new technology, the existing commercially available product of can all regenerating.

Claims (1)

1. A kind of electrical equipment delay protection system that selective power is arranged, the selection that it is characterized in that this system has a power failure in short-term has discharge time delay resistance R in the delay protection circuit ₅, discharge delay capacitor C ₃, blocking diode D ₇, resistance R ₁₀Be attempted by triode D ₄Base stage and emitter on, resistance R ₈Be attempted by triode D ₃Base stage and emitter on; And design has the temperature switch of adjustment K switch ₁, the overload that has caused when having prevented to adjust thermostat; Resistance R in power circuit ₁With decompression capacitor C ₁Serial connection has prevented some phenomenons in the AC network such as switch and the components and parts that cause damage and the instability of line work, and power supply shows light-emitting diode D ₅Positive pole is connected to filter capacitor C ₂, negative pole is connected to voltage stabilizing didoe D ₆, make power supply show light-emitting diode D ₅Be difficult for damaging and brightness stability voltage stabilizing didoe D in the moment of energized ₆And D ₁₀Serial connection provides two level A and B to circuit; The working power line of transformer B can be by relay J in the voltage stabilizing circuit ₃Break of contact and connection, for preventing relay J ₂, J ₃In the frequently all action designs of voltage critical point feedback resistance R is arranged ₁₅, R ₂₂Leakage protection circuit has earth leakage protective terminals 5; Moment crosses, discharge diode D is arranged in the under-voltage holding circuit ₁₆