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Protection circuit

A technology for protecting circuits and circuits, which is applied in the direction of protection against overvoltage, and can solve problems such as fire or electric shock

Inactive Publication Date: 2014-10-22
WARECONN TECH SERVICE (TIANJIN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Generally, high-power electronic equipment or electric equipment is powered by AC mains. When the AC mains voltage is too high, it will burn the electronic equipment or electric equipment, and even cause fire or electric shock and other safety accidents in severe cases.

Method used

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  • Protection circuit

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Embodiment Construction

[0010] The present invention is described in further detail below in conjunction with the accompanying drawings and preferred embodiments:

[0011] Please refer to figure 1 , the preferred embodiment of the protection circuit of the present invention includes a first connector 10 connected to AC mains, a second connector 50 connected to electrical equipment, an AC / DC conversion circuit 20, two resistors R2 and R3, a stable Voltage diode D6, a diode D5, a relay RL1 and two triodes Q1, Q2. In this embodiment, the triodes Q1 and Q2 are both NPN-type triodes. The second connector 50 is a three-pin socket JP1, and the electrical equipment can be powered on by connecting to the three-pin socket JP1 through a power cord plug.

[0012] The AC-DC conversion circuit 20 is connected to the first connector 10 and is used for converting the AC mains power received through the first connector 10 into a DC voltage. The first connector 10 includes a neutral wire end corresponding to the AC...

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PUM

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Abstract

An overvoltage protection circuit includes a first connector connected to an alternating current (AC) power source, a second connector connected to an electronic device, an alternating current to direct current (AC / DC) rectifying circuit, a voltage regulating diode, a relay, a first electronic switch, and a second electronic switch. The first connector is connected to the AC / DC rectifying circuit. The AC / DC rectifying circuit is connected to the first electronic switch through the voltage regulating diode. The first electronic switch is connected to the second electronic switch. The second electronic switch is connected to the relay. The first connector is connected to the second connector through the relay.

Description

technical field [0001] The present invention relates to a protection circuit. Background technique [0002] Generally, high-power electronic equipment or electric equipment are powered by AC mains. When the voltage of the AC mains is too high, the electronic equipment or electric equipment will be burned, and in serious cases, safety accidents such as fire or electric shock will occur. SUMMARY OF THE INVENTION [0003] In view of the above, it is necessary to provide a protection circuit to cut off the AC mains when the voltage of the AC mains exceeds a preset value, thereby protecting the electrical equipment. [0004] A protection circuit includes a first connector connected to AC mains, a second connector connected to electrical equipment, an AC-DC conversion circuit, a Zener diode, a relay, a first electronic switch and a first Two electronic switches, the relay includes a drive coil and a shrapnel switch, and the two input ends of the AC-DC conversion circuit are res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/20
CPCH02H3/20
Inventor 周海清
Owner WARECONN TECH SERVICE (TIANJIN) CO LTD