CN102072141A

CN102072141A - Control circuit capable of out-of-control prevention for compressor of refrigerator

Info

Publication number: CN102072141A
Application number: CN2011100434539A
Authority: CN
Inventors: 杨桂福
Original assignee: Wuxi Hodgen Technology Co Ltd
Current assignee: Wuxi Hodgen Technology Co Ltd
Priority date: 2011-02-23
Filing date: 2011-02-23
Publication date: 2011-05-25

Abstract

The invention provides a control circuit capable of out-of-control prevention for a compressor of a refrigerator, which relates to a controller of a household electrical appliance. The control circuit capable of out-of-control prevention for the compressor of the refrigerator is characterized in that the circuit is connected to one output port of a single chip computer, a level turning circuit is formed by using the connection of two triodes, then a coil of a control relay is output, and a contact of the relay controls a load, wherein the front end of the base electrode of a first triode is connected with an electrodeless capacitor in series, the collector electrode of the first triode is connected with the base electrode of a second triode, and an electrolytic capacitor is also connected to the base electrode of the second triode in parallel. By the control circuit capable of out-of-control prevention for the compressor of the refrigerator, which is disclosed by the invention, direct-current level is isolated by utilizing the capacitors, the continuous working of the compressor, which is caused when the single chip computer outputs high level continuously, also can be effectively prevented by utilizing an energy storage capacitor, the compressor is protected, and the potential safety hazard is reduced.

Description

A kind ofly prevent freezer compressor control circuit out of control

Technical field

The present invention relates to a kind of refrigerator controller, specifically is a kind of controlling method and circuit of controlling the freezer compressor operation.

Background technique

The household refrigerator controller for the control of non-frequency compressor, all is to use relay as switching element now, and relay and master chip plate are placed apart.By level triggers or comment conversion regime relay is controlled, connected or disconnected the compressor of refrigerator.

In the prior art, most controllers have all adopted single-chip microcomputer to control as main control chip, in these control circuits, utilize the input/output port (I/O mouth) of single-chip microcomputer, and by power conversion apparatus, the output high-low level is controlled compressor.

The shortcoming of sort circuit is, in case generation external interference, such as situations such as power network fluctuation, high frequency radiation or electrical spark sparkings, because the antijamming capability of main controller is limited, the control program that very easily takes place to move in single chip microcomputer halt or the single-chip microcomputer runs the situation that flies, thereby causes the out of control of compressor.There is potential safety hazard in the damage that this just is easy to cause compressor.

Summary of the invention

The objective of the invention is to invent a kind of refrigerator control circuit that can prevent that the described out-of-control condition of background technique from taking place, and the specific procedure method of corresponding sort circuit.

For reaching the foregoing invention purpose, the present invention designs following circuit:

This circuit is connected on the delivery outlet of single-chip microcomputer, use two triodes to connect and compose the level reverse circuit, the coil of output control relay then, the contact control load of relay, wherein, electrodeless electric capacity of the base stage front end of first triode series connection, the collector electrode of first triode connects the base stage of second triode, on the base stage of second triode also and an electrochemical capacitor arranged.

The electrochemical capacitor of this circuit has the energy storage effect, with the frequency of input/output port output is to become high level after the PWM ripple shaping of 100Hz ~ 1kHz, makes second triode saturated, the control compressor operating; In the time of the delivery outlet output low level, can in time end second triode.Electrodeless electric capacity plays the effect of isolated DC level.

The invention has the beneficial effects as follows: when cause locked of external interference software or when crashing, the delivery outlet of single-chip microcomputer continues output high level or low level.This circuit can be isolated the inflow of this DC level in this case, and triode that yet can't second direct control relay of conducting just can not cause the wrong continuous action of relay, can protect compressor not to be damaged.

Use the concrete grammar of circuit of the present invention to be:

The input/output port that single-chip microcomputer at first is set is the delivery outlet state, output low level when not allowing compressor to open; Output high level when allowing, high level output has the cycle regularly to be 1 millisecond, and the cycle is returned then to regard to the zero clearing cycle timer; Cycle is to then directly returning.Assurance is output as the PWM ripple of high-low level clocklike.

Description of drawings

Fig. 1, existing freezer compressor control circuit figure;

Fig. 2, circuit diagram of the present invention.

Embodiment

Fig. 1 be prior art utilize the Single-chip Controlling relay switch, control the work of freezer compressor or stop.In this circuit, a triode 2 is as switching tube, and the output terminal P01 of single-chip microcomputer only exports high level or low level, change the saturated or cut-off state of triode 2, and relay 5 coils that control is attached thereto obtain.The contact of relay 5 is connected in load 6 circuit, becomes the switch of load.Sort circuit, in case single-chip microcomputer is out of control, delivery outlet P01 may continue to export a high level or low level, and can not change, if always output be high level, the saturated always connection of triode 2, load 6 just compressor with continuous service, be easy to cause damage, and other potential safety hazards are arranged.

Fig. 2 is an embodiment of circuit of the present invention.

In this circuit, adopt two triode series connection to use, level signal to input is overturn, the base stage of first triode 3 is introduced level and is believed, collector electrode is connected to the base stage of second triode 4 later on through divider resistance, the coil of the collector connection relay 5 of second triode 4, the contact control load 6 of relay 5.And, be connected in the circuit of triode at the delivery outlet of single-chip microcomputer, be in series with an electrodeless electric capacity 7, be parallel with an electrochemical capacitor 8 on the base stage of second triode 4 of control relay coil.

Cooperate the software program in the single-chip microcomputer, working principle:

Single-chip microcomputer configures the time lag of compressor switch as required, exports the high-low level at interval clocklike at delivery outlet accordingly, the corresponding start of general high level, and low level correspondence compressor stops.Under the start situation, delivery outlet P01 output be that dutycycle is 50%, frequency is the PWM ripple of 100Hz ~ 1kHz, this output is through the upset of two triodes, and become high level through after the shaping of electrochemical capacitor 8, allow second triode 4 saturation conduction, relay 5 coils get electric adhesive, the normal worker's group of compressor.Wherein the size of electrochemical capacitor can be adjusted according to output PWM wave frequency, the output frequency height, and the capacity of electrochemical capacitor 8 is little.

When the needs compressor load stops, delivery outlet P01 output low level, and the energy storage effect of electrochemical capacitor 8 at this moment disappears, and discharge finishes, and second triode 4 ends, and relay coil dead electricity contact is decontroled, and load just compressor just quits work.

The effect of electrodeless electric capacity 7 is isolated DC level; when producing serious the interference, the external world causes being output as lasting high level or low level the time; this dc level signal will be isolated by electrodeless electric capacity 7 and can not be moved on backward; and after the electrochemical capacitor 8 discharge end; also can allow second triode 4 end; allow compressor shutdown, reach and prevent the long-term continuous operation of compressor or be under the runaway condition.

Claims

1. one kind can prevent freezer compressor control circuit out of control, it is characterized in that: this circuit is connected on the delivery outlet (P01) of single-chip microcomputer, use two triodes to connect and compose the level reverse circuit, the coil of output control relay (5) then, the contact control load (6) of relay, wherein, a base stage front end series connection electrodeless electric capacity (7) of first triode (3), the collector electrode of first triode connects the base stage of second triode (4), on the base stage of second triode also and an electrochemical capacitor (8) arranged.