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Protection circuit for household appliance

A technology for protecting circuits and household appliances. It is applied in emergency protection circuit devices, circuit devices, and protection against overvoltages. It can solve problems such as repeated start-up, on-off, and unstable power supply of compressors.

Inactive Publication Date: 2012-04-18
SHAANXI DONGXIAN YONGYI ELECTROMECHANICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The working environment of many electrical appliances is relatively special, such as refrigerators, freezers, etc., and it is very taboo to have unstable power supply, especially repeated power failures in a short period of time, because this will cause repeated startup and on-off of the compressor

Method used

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Embodiment Construction

[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0015] As shown in the drawings, the present invention is a protection circuit for household appliances, including a step-down rectifier circuit 1, which provides a DC voltage for the entire circuit, and is realized by a 1N4001X4 rectifier; an undervoltage and overvoltage control circuit 2, which is lower than or higher than normal The DC voltage of the working voltage is amplified or protected by power failure. The rheostat W1 and W2 are connected in parallel and connected to the output of the step-down rectifier circuit 1. The rheostat W1 is connected in series with the resistors R1 and R2. The rheostat W2 is connected in series with the resistors R3 and R4. The resistor R2 is connected in parallel to the button Switch AN1, resistor R4 is connected in parallel with button switch AN2, the other end of the parallel resistor group is connected t...

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Abstract

The invention relates to a protection circuit for a household appliance, which comprises a voltage reduction and rectification circuit, an undervoltage and overvoltage control circuit, a time delay circuit, an electric leakage detection circuit and a sound and light alarm circuit, wherein the voltage reduction and rectification circuit is used for providing a direct current voltage for the whole circuit; the undervoltage and overvoltage control circuit is used for carrying out amplification and power-off protection on the direct current voltage lower or higher than a normal working voltage; the time delay circuit is used for providing a time delay voltage after the household appliance is suddenly powered off; the electric leakage detection circuit is used for detecting the electric leakage condition of the appliance; and the sound and light alarm circuit is used for starting alarm according to a detecting result of the electric leakage detection circuit. Compared with the prior art, the protection circuit for the household appliance can simultaneously provide functions of overvoltage and undervoltage protection, power-off time delay, electric leakage automatic power-off and sound and light alarm.

Description

technical field [0001] The invention belongs to the technical field of electric appliance protection, and relates to a protective circuit for household electric appliances Background technique [0002] The working environment of many electrical appliances is relatively special, such as refrigerators, freezers, etc., and it is very taboo to have unstable power supply, especially repeated power failures in a short period of time, because this will cause repeated startup and on-off of the compressor. Contents of the invention [0003] In order to overcome the disadvantages of the prior art above, the object of the present invention is to provide a protection circuit for household appliances, which can avoid accidental damage to the appliances when the power supply is unstable, and has the characteristics of simple structure and convenient use. [0004] In order to achieve the above object, the technical scheme adopted in the present invention is: [0005] Household appliance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/00H02H3/20H02H3/24H02H3/247H02H3/04
Inventor 任东红
Owner SHAANXI DONGXIAN YONGYI ELECTROMECHANICAL TECH
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