CN2053806U

CN2053806U - Safety protection device for electric refrigerator

Info

Publication number: CN2053806U
Application number: CN 89217157
Authority: CN
Inventors: 袁乐勤
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-09-18
Filing date: 1989-09-18
Publication date: 1990-02-28

Abstract

The utility model discloses a safety protection device for the electric refrigerator, which is composed of a current checking circuit, an amplifying circuit, a maintaining circuit, an OR gate drive circuit, a power regulation circuit, a fault indicating circuit, a selective circuit, a power circuit, a plug CT, a socket CZ and a casing. The safety protection device for the electric refrigerator adopts the amplifying circuit. The maintaining circuit and the OR gate drive circuit, so the safety protection device for the electric refrigerator can act to protect a compressor from being damaged in time when the inner of the refrigerator has a disconnection fault. The safety protection device for the electric refrigerator has the advantages of reasonable design, high reliability, complete functions and stable working.

Description

Safety protection device for electric refrigerator

The utility model relates to a kind of refrigerator protector, particularly a kind of refrigerator protector that is perfectly safe.

In the prior art; even state-of-the-art memory time-delay multi-functional refrigerator protector; in the time of also can only after the external circuit outage of protector front, restoring electricity again suddenly; just play the delay protection effect, and to loosening, former protector partial circuit rosin joint is arranged between the loose contact of refrigerator internal wiring, refrigerator plug and protector socket and when getting food refrigerator shaken etc. and just can not in time have been shielded when reason causes the instant cut-off fault.After above-mentioned fault takes place, just can cut off the electricity supply when compressor current increases, and will be easy to burn out compressor so often.

The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and provides a kind of and can just begin the refrigerator that compressor the carries out delay protection protector that is perfectly safe from the refrigerator instant cut-off.

The purpose of this utility model can reach by following measure: the utility model is by current detection circuit; power adjusting circuit; the overload signal amplifying circuit; the delayed startup circuit; current foldback circuit; failure indicating circuit; power circuit; plug CT; socket CZ; shell is formed; it is characterized in that: also have amplifying circuit; holding circuit; or gate drive circuit; select circuit; power adjusting circuit is sent in the output one tunnel of current detection circuit; the veer away input of big circuit of another road; the output of amplifying circuit leads up to that holding circuit connects or gate drive circuit; another road is directly delivered to or gate drive circuit; the output of power adjusting circuit is by the overload signal amplifying circuit; the delayed startup circuit is delivered to current foldback circuit; failure indicating circuit is also delivered in the output of delayed startup circuit; the output of current foldback circuit is sent or gate drive circuit; the input of circuit is selected in the output selecting of failure indicating circuit, selects the output of circuit to connect or gate drive circuit.

The purpose of this utility model can also reach by following measure: in the current detection circuit transformer L (1) end by or the end of the contact J1-1 combination hub CZ of gate drive circuit repeat circuit J, select the collector electrode of BG10 in the circuit to connect by K switch or gate drive circuit in the base stage of BG5, the base stage of BG10 meets the negative electrode E of controllable silicon SCR in the failure indicating circuit, emitter grounding, the emitter-base bandgap grading of BG3 in the holding circuit, in the delayed startup circuit collector electrode of BG8 connect or gate drive circuit in the base stage of BG5, the coil of the collector connecting relay J of BG5, emitter grounding, the collector electrode of BG1 connects the base stage of BG2 in the holding circuit in the amplifying circuit by R3, the collector electrode of BG2 is by diode D2, inverter F1, resistance R 5, R6 connects the base stage of BG3, the emitter-base bandgap grading of BG3 connect or gate drive circuit in the base stage of BG5.

Figure (1) is a functional-block diagram of the present utility model;

Figure (2) is an electrical schematic diagram of the present utility model.

The utility model is described in further detail below in conjunction with accompanying drawing (embodiment):

With reference to figure (1), the utility model is made up of current detection circuit 1, amplifying circuit 2, holding circuit 3 or gate drive circuit 4, power adjusting circuit 5, overload signal amplifying circuit 6, delayed startup circuit 7, current foldback circuit 8, failure indicating circuit 9, selection circuit 10, power circuit 11, plug CT, socket CZ, shell etc.

With reference to figure (2), amplifying circuit 2 is made up of BG1, R1, R2 etc., and holding circuit 3 is made up of BG2～BG4, R3～R10, C2, D2, inverter F1; Or gate drive circuit is made up of BG5, relay J, R11, diode D3.After energized, because not adhesive of relay J, so the compressor access failure, coil L1 no current flows through, L2 does not have induced current voltage, and triode BG1 ends, and BG2 is saturated, give inverter F1 input electronegative potential, so F1 output high potential, BG3 is saturated, and BG5 is saturated, refrigerator is connected in relay J energising adhesive; At this moment L1 has electric current to pass through, and L2 has responded to current/voltage, gives D1 rectification, C1 filtering, the BG1 conducting, BG4 ends, and BG5 continues conducting, but BG2 was ended by saturated transferring to, power supply is defeated by the F1 high potential after being full of electricity by R4, D2 to C2, so F1 output electronegative potential, after BG3 is ended, BG5 is still saturated, continues attracting electric relay J, makes compressor operating.When (cutting off the power supply) for a certain reason as loose contact of refrigerator inside or external circuit; the L1 no current is passed through, the non-inductive electric current voltage of L2, BG1 ends; BG4 is saturated; because C2 has been full of electricity, so F1 output electronegative potential, BG3 ends again; therefore BG5 ends immediately; J disconnects immediately, the compressor outage, thus in time play a protective role.Because R5 is much larger than R4, therefore discharge is very slow, treat 5 minutes C2 discharge offs after, F1 input electronegative potential output high potential, BG3, BG5 are saturated again, adhesive J makes refrigerator work again.

In running; if compressor overwork; the voltage ratio of L2 induction is just often big; BG6 in the overload signal amplifying circuit is than more conducting of normal value, and BG7 more trends towards ending, the further charging of the C4 in the delayed startup circuit of power supply; after waiting to be charged to energy conducting voltage-stabiliser tube D7; BG8 in the current foldback circuit is saturated, and BG5 ends immediately, and compressor is cut off the power supply immediately.Because of the charge constant of C4, R16 and W1, R12, C3 starting time greater than refrigerator, though so during the refrigerator starting electric current very big, can not make BG8 saturated and make the compressor outage yet.Adjust the operating current of the whole BG6 of adjustable size of W1, thereby adapt to the refrigerator of various different capacities.When compressor start at need, the current ratio that flows through L1 is big when normally starting, the voltage of L2 induction height during also than normal starting, therefore, C3 is full of electricity very soon, BG8 is saturated immediately, BG5 ends immediately, J is tripping immediately, the compressor outage, thus be protected.

Failure indicating circuit is by inverter F2, BG9, R17～R19, and controllable silicon SCR, luminous tube LED1, diode D6 form.When once loading, inverter F2 import high potential when super, the output electronegative potential, and BG9 ends, and controllable silicon SCR has the eternal conducting of trigger voltage because of grid, and LED1 is luminous forever, causes that the user notes, checks reason.If when at this moment selecting K switch in the circuit to be in closure state (position is perfectly safe), because of BG10 conducting in the sixth of the twelve Earthly Branches, so BG5 ends forever, compressor is switched on never, examine could recover behind the refrigerator normally to move.

Power circuit is made up of transformer B, capacitor C 5, rectifier bridge Z.

The utility model has following advantage compared to existing technology:

1. when the reasons such as the inner loose contact of refrigerator cause instant cut-off, power supply is cut off, and postponed to recover after 5 minutes, avoid burning out compressor.

2. circuit is reasonable, design is ingenious, multiple functional, working stability, dependable performance.

Claims

1; a kind of refrigerator protector that is perfectly safe; by current detection circuit 1; power adjusting circuit 5; overload signal amplifying circuit 6; delayed startup circuit 7; current foldback circuit 8; failure indicating circuit 9; power circuit 11; plug CT; socket CZ; shell is formed; it is characterized in that: also have amplifying circuit 2; holding circuit 3; or gate drive circuit 4; select circuit 10; power adjusting circuit is sent in the output one tunnel of current detection circuit; the veer away input of big circuit of another road; the output of amplifying circuit leads up to that holding circuit connects or gate drive circuit; another road is directly delivered to or gate drive circuit; the output of power adjusting circuit is by the overload signal amplifying circuit; the delayed startup circuit is delivered to current foldback circuit; failure indicating circuit is also delivered in the output of delayed startup circuit; the output of current foldback circuit is sent or gate drive circuit; the input of circuit is selected in the output selecting of failure indicating circuit, selects the output of circuit to connect or gate drive circuit.

2, protector according to claim 1 is characterized in that: in the current detection circuit transformer L (1) end by or the end of the contact J1-1 combination hub CZ of gate drive circuit repeat circuit J.

3, protector according to claim 1 is characterized in that: select the collector electrode of BG10 in the circuit to connect by K switch or gate drive circuit in the BG5 base stage, the base stage of BG10 connects the negative electrode E of controllable silicon SCR in the failure indicating circuit, emitter grounding.

4, protector according to claim 1 is characterized in that: in the holding circuit in the emitter-base bandgap grading of BG3, the delayed startup circuit collector electrode of BG8 connect or gate drive circuit in the base stage of BG5, the coil of the collector connecting relay J of BG5, emitter grounding.

5, protector according to claim 1; it is characterized in that: the collector electrode of BG1 connects the base stage of BG2 in the holding circuit in the amplifying circuit by R3; the collector electrode of BG2 connects the base stage of BG3 by diode D2, inverter F1, resistance R 5, R6, the emitter-base bandgap grading of BG3 connect or gate drive circuit in the base stage of BG5.