Loaded multifunctional protection circuit

Abstract

The invention relates to the field of electronic circuits, in particular to an electric supply load protection circuit against overvoltage, overcurrent, current leakage, short circuits, surge and lighting strokes. A loaded multifunctional protection circuit of the invention carries out monitor and protection on current, voltage and leakage current of alternating current respectively by an overcurrent protection circuit comprising an overcurrent mutual inductor, a rectifier bridge unit, a resistance voltage dividing unit, an operational amplifier comparison circuit and a thyristor, an overvoltage protection circuit comprising a rectifier bridge unit, a resistance voltage dividing unit, an operational amplifier comparison circuit and a thyristor, and a current leakage protection circuit comprising a zero sequence current mutual inductor, a current leakage protection chip and a thyristor. . When a load access end has the phenomena of overcurrent, overvoltage and current leakage, a tripping device is controlled by a tripping device coil to disconnect an input channel of the alternating current so as to avoid electrical hidden danger and safeguard personal and property safety. Meanwhile, lighting stroke protection, surge protection and faulty connection protection can be carried out through a piezoresistor and an indicator light unit among the fire wire, the zero wire and the earthwire.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a multifunctional protection circuit for overvoltage, overcurrent, leakage current, short circuit, surge and lightning strike at the load end driven by AC mains. Background technique [0002] Various electrical loads (such as refrigerators, televisions, computers, hair dryers, etc.) driven by AC mains are inseparable from people's lives. However, at the access end of electrical loads, such as wall switches, power adapters, or power strips, etc., only provide access ports for electrical loads, without the necessary electrical protection, posing potential safety hazards. In the event of short circuit, leakage, overvoltage, overcurrent, lightning strike, electrification of the ground wire or disconnection of the ground wire, it is easy to damage the load and cause personal injury to the user, and it is also easy to cause an electrical fire and property loss. Contents of the inve...

AI Technical Summary

Problems solved by technology

However, at the access end of electrical loads, such as wall switches, power adapters, or power strips, etc., only provide access ports for electrical loads, without the necessary electrical protection, posing potential safety hazards

In case of short circuit, leakage, overvoltage, overcurrent, lightning strike, charged ground wire or disconnected ground wire, it is easy to damage the load and cause personal injury to the user, and it is also easy to cause electrical fire and property loss

Images