Household electrical appliance protection device

Abstract

The invention discloses a household electrical appliance protection device. The household electrical appliance protection device comprises a voltage stabilization power supply, a voltage sampling circuit and an execution circuit, wherein the voltage stabilization power supply is used for providing a power supply, the voltage sampling circuit is used for acquiring a voltage of the power supply, theexecution circuit is used for driving a relay to work so that the power supply of a household electrical appliance is timely switched off when over-voltage occurs, the voltage stabilization power supply comprises a transformer, a bridge rectification circuit and a voltage stabilizer, the voltage sampling circuit comprises a first triode, a second triode and a third triode, a collector of the third triode is connected with an output end of the voltage stabilizer via a coil of the relay, the execution circuit comprises a normally-open contact of the relay and a timer, an output end of the timeris connected with a control electrode of a bidirectional silicon-controlled rectifier, a positive electrode of the bidirectional silicon-controlled rectifier is connected with the power supply of thehousehold electrical appliance. By the household electrical appliance protection device, the power supply of the household electrical appliance can be timely switched off when over-voltage or under-voltage occurs, the damage to the household electrical appliance due to excessively high or excessively low voltage is prevented, and the equipment is enabled to safely and reliably work.

Description

technical field [0001] The invention relates to the technical field of electric equipment protection, in particular to a household appliance protection device. Background technique [0002] For most household appliances, the voltage range of the working power supply is strictly limited. Overvoltage or undervoltage will have a serious impact on the work of household appliances. A fire causes property loss. When the voltage is too low, it will affect the normal operation of household appliances. If the voltage is too low for a long time, it will also cause the motor windings of household appliances to burn out, which will affect the normal operation of household appliances and cause accidents. Therefore, real-time monitoring It is very necessary to monitor and protect the power supply voltage of household appliances to ensure the normal operation of household appliances. Contents of the invention [0003] The purpose of the present invention is to provide a protection devic...

AI Technical Summary

Problems solved by technology

[0002] For most household appliances, the voltage range of the working power supply is strictly limited. Overvoltage or undervoltage will have a serious impact on the work of household appliances. A fire causes property loss. When the voltage is too low, it will affect the normal operation of household appliances. If the voltage is too low for a long time, it will also cause the motor windings of household appliances to burn out, which will affect the normal operation of household appliances and cause accidents. Therefore, real-time monitoring It is very necessary to monitor and protect the power supply voltage of household appliances to ensure the normal operation of household appliances

Images