CN2186895Y

CN2186895Y - Refrigerating compressor protector with voltage increasing and starting function

Info

Publication number: CN2186895Y
Application number: CN 94206586
Authority: CN
Inventors: 王卫平; 向涛
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-03-12
Filing date: 1994-03-12
Publication date: 1995-01-04
Anticipated expiration: 2004-03-12

Abstract

The utility model discloses a refrigerating compressor protector with voltage increasing and starting function, particularly the protector of the refrigerating compressor of a refrigerator. The utility model comprises voltage increasing and starting circuit which is composed of transporting and discharging circuit. The comparison between the reference voltage generated from the circuit of the reference voltage of the protector and the voltage of the sampled signal reflecting the high and low voltage of urban electricity system is taken by the utility model, and the groups of starter windings of the compressor are respectively connected to the high voltage end (280V) or low voltage end (220V) of an autotransformer due to the result of the comparison. The utility model has the advantage that the voltage increasing and starting function makes the compressor start in the natural voltage under the condition that the voltage of the urban electricity system is lower than the natural voltage (but not lower than the voltage of the under voltage protection of the protector).

Description

Refrigerating compressor protector with voltage increasing and starting function

The utility model relates to Protector for electric appliances, particularly a kind of refrigeration compressor (refrigerator) protector with the startup function of boosting.

Various commercially available refrigeration compressors (refrigerator) protector generally only has overvoltage, under-voltage protection and delayed startup function at present; but it is to cause heavy hammer started device not throw off because of supply voltage is low excessively mostly that compressor is burnt, and makes the startup winding of compressor be in abnormal continuous powering state and causes.Therefore, common refrigeration compressor (refrigerator) protector is had a greatly reduced quality its protection effect because of not avoiding this main cause that causes compressor to be burnt.In addition, common refrigeration compressor (refrigerator) protector mostly is in continuous duty, all the time not in power consumption.The utility model except common refrigeration compressor (refrigerator) defencive function that protector had, also provides a kind of startup function of boosting in order to overcome the above-mentioned deficiency of existing procucts.When supply voltage low excessively (being not less than the under-voltage protection voltage of protector), supply voltage is raise, refrigeration compressor is started with normal voltage, and replaced heavy hammer started device with control circuit, thoroughly avoided the above-mentioned deficiency in the prior art.In addition; in order to accomplish real power saving, the power supply of protector of the present utility model is controlled by temperature controller, and promptly its working time is identical with the time of compressor operating; do not resemble and be in long-term "on" position common refrigeration compressor (refrigerator) protector, therefore very power saving.

Above-mentioned purpose of the present utility model is to realize by the output that is provided with booster circuit and start operation winding control circuit and make the power supply of protector be taken from temperature controller in the circuit of protector; they make refrigeration compressor respectively when supply voltage is on the low side; still can start with normal voltage; got rid of heavy hammer started device, and made protector not be in "on" position always.

Below referring to the description of accompanying drawing, above-mentioned advantage of the present utility model will be come into plain view.

Fig. 1 is a circuit block diagram of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

At first referring to Fig. 1; by this figure as seen; refrigeration compressor of the present utility model (refrigerator) protector is made up of 11 parts, and they are respectively overcurrent protector 1, overvoltage protector 2, transformer 3, sampled voltage circuit 4, reference voltage circuit 5, under-voltage protecting circuit delay circuit 7, operation in 6,5 minutes starting winding turn-on control circuit 8,2 seconds delay circuits 9, startup winding power-off control circuit 10 and booster circuits 11.Interaction relationship between them is shown in arrow among the figure, and their the detailed circuit structure and the course of work will describe in detail referring to circuit theory diagrams.

Fig. 2 is the schematic diagram of Fig. 1 circuit.Now, describe the course of work of the utility model protector in detail referring to this figure.

S1 and S2 are the civil power incoming end, and 5. an end of power supply and the input of protector join, and the other end is connected to the input of temperature controller, and 4. another input of the output of temperature controller and protector joins, and the utility model is connected between temperature controller and the compressor.T1 is (down together) overcurrent protector 1 among Fig. 1, is actually an overcurrent relay.Increase when causing the overcurrent relay action when refrigeration compressor (refrigerator) cryogenic temperature is lower than in fixed ceiling or the running current anomaly, protector and refrigeration compressor (refrigerator) lose power supply simultaneously and quit work.

Civil power is delivered to overvoltage protector 2 through overcurrent protector 1, and it is made up of a piezo-resistance RV1 and insurance PS1.When line voltage was higher than the upper voltage limit (250V) of protector permission work, piezo-resistance was breakdown, thereby blowout is realized over-voltage protecting function.

Through overvoltage protector 2, civil power is added in input I2, the I4 two ends of the auto-transformer TR of protector.If civil power is 220V, transformer output ± 15V(I3, I5 end then), the 220V(I2 end) and the 280V(I1 end), the I4 end for hold.± 15V supplies with under-voltage protecting circuit 6, sampled voltage circuit 4 and reference voltage circuit 5; The startup winding L 1 of 220V or 280V the supply system cold compressor and operation winding L 2.

Sampled voltage circuit 4 is by commutation diode D4, D5, filter capacitor C4, and sampling resistor R1, R2 and filter capacitor C3 form.± 15V input is output direct current 17V after rectification, filtering, obtains reflecting the direct current signal V1 of line voltage height after dividing potential drop, uses for under-voltage protecting circuit 6.

Reference voltage circuit 5 is by integrated voltage stabilizer U1, and resistance R 4, R5 and capacitor C 1 are formed.The signal of U1 output obtains reference voltage signal V2 supply section circuit and uses through resistance R 4, R5 dividing potential drop.

Under-voltage protecting circuit 6 is the core with amplifier unit U2.It will compare and enlarge from the signal V1 of sampled voltage circuit 4 and signal V2 from reference voltage circuit 5: if V1 is higher than V2, amplifier output high level allows compressor start; If V1 is lower than V2, the amplifier output low level is forbidden compressor start.

Delay circuit 7 was made up of protection diode D3, Zener diode D2, charging resistor R3 and capacitor C 5 in 5 minutes.When under-voltage protecting circuit allowed compressor start, amplifier unit U2 exported high level, charges to C5 through R3, obtains an increasing voltage signal V3 on C3, was compared by V3 and reference signal V2.When V3 is higher than V2, compressor start.D3 and D2 finish protection and voltage stabilizing function.

Operation starts 8,2 seconds delay circuits 9 of winding turn-on control circuit and starts running control circuit 10 common compositions with startup winding power-off control circuit.It is by amplifier unit U4, U5, resistance R 9, R10, R11, R12, and diode D1, D7, D8, capacitor C 2, triode Q2, Q3, relay J 1, J2 form.When V3 was higher than V2 in 5 minutes delay circuits, amplifier unit U4, U5 exported high level simultaneously, and respectively by R10, R11 current limliting, Q2, Q3 amplify, and drive relay J 1, J2 adhesive, started winding L 1 and operation winding L 2 is switched on compressor start simultaneously; The high level of U4 output simultaneously charges to C2 by R12, and C2 is full of after 2 seconds, the U5 output low level, and J2 disconnects, and starts winding L 1 outage, and compressor is finished start-up course and is entered normal operating condition.

Booster circuit is by amplifier unit U3, resistance R 6, R7, R8, and capacitor C 6, diode D6, triode Q1, relay J 3 is formed.Behind the rectifying and wave-filtering+17V voltage obtains a sampled signal V4 through resistance R 6, R7 dividing potential drop, with reference voltage V 2 relatively.As V4 during less than V2, amplifier unit U3 exports high level, amplifies 3 actions of rear drive relay J through C6 filtering, R8 current limliting, Q1, and the 280V output that starts winding and transformer joins, and finishes the startup function of boosting; As V4 during greater than V2, amplifier unit U3 output low level, J3 is failure to actuate, and the 220V output that starts winding and transformer joins, and start-up course is the normal pressure startup.

In sum, protector of the present utility model still can start refrigeration compressor by normal voltage owing to have the startup of boosting function especially when supply voltage is on the low side, protected compressor effectively.In addition, owing to adopt integrated circuit, accuracy height, good stability, volume are small and exquisite; can be installed in refrigeration machine (refrigerator) inside, easy to use, because its power on/off is controlled by temperature controller; its working time is identical with the time of compressor operating, than the power saving more of common protector.

Claims

1, a kind of refrigerant compression protector is started winding turn-on control circuit, 2 seconds delay circuits and is started winding power-off control circuit etc. by overcurrent protector, overvoltage protector, auto-transformer, sampled voltage circuit, reference voltage circuit, under-voltage protecting circuit, delay circuit, operation in 5 minutes and forms.The three kinds of circuit general designations in back start running control circuit; it is characterized in that also comprising booster circuit; auto-transformer is taken from the input of reference voltage circuit; be respectively under-voltage protecting circuit, startup operation winding control circuit and booster circuit reference voltage is provided; auto-transformer is also taken from the input of sampled voltage circuit, is respectively under-voltage protecting circuit and booster circuit provides sampled voltage.The signal trend of other circuit part is identical with the above-mentioned order that the composition of protective device is described, and the start-up circuit that boosts mainly is made up of the comparator that amplifier is made.It compares the reference voltage that reference voltage circuit produces with reflection line voltage sampled voltage just, by relay the startup winding of freezer compressor is connected to the high voltage end or the low-voltage end of auto-transformer respectively according to comparative result, when line voltage is low, realizes boosting startup.

2, by the described protective device of claim 1, it is characterized in that it is connected between the temperature controller and compressor of refrigeration system, the working time is subjected to the control of temperature controller, and is synchronous with the working time of compressor.