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Loaded multifunctional protection circuit

A protection circuit, multi-functional technology, applied in emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc., can solve the problems of personal injury, property loss, and easily damaged loads of users, and avoid electrical hidden dangers. , Anti-surge protection, the effect of preventing wrong wiring, ensuring personal and property safety

Active Publication Date: 2011-02-16
XIAMEN ZTC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Loaded multifunctional protection circuit
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Embodiment Construction

[0016] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0017] refer to figure 1 As shown, the overvoltage and overcurrent protection circuit of this embodiment is specifically: the live wire L of the alternating current is connected to an overcurrent transformer ZCT1, and the output of the overcurrent transformer ZCT1 is connected to the rectifier unit and the delay unit to the first comparison The first input terminal of IC1, the live line L and neutral line N of AC are connected to a release TK1 and a rectification bridge unit DB1 composed of 4 diodes, the output terminal of the rectification bridge unit DB1 is connected to the rectification ground Enter a thyristor SCR1 and a unit composed of step-down resistors R11, R16, R20, the middle end of the series resistors R8, R9 is connected to the second input terminal of the first comparator IC1, the series resistors R10, R8 The middle end connects a volt...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/32
Inventor 蔡峰毅唐锡臣
Owner XIAMEN ZTC TECH
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