High-speed and safe AC overvoltage protector

Abstract

A high-speed and safe AC overvoltage protector consists of a rectifier bridge, an operational amplifier, an operational amplifier first detection resistor, an operational amplifier second detection resistor, an operational amplifier power supply first voltage dividing resistor, and an operational amplifier power supply second voltage dividing resistor, a filter capacitor, a voltage regulator tube,a reference first resistor, a reference second resistor, a switch tube and a circuit board. A double rectifier bridge structure and the switch tube are employed to achieve over-voltage high-speed shutdown load power supply, and power supply is restored instantaneously after the high voltage; and moreover, the high-speed and safe AC overvoltage protector overcomes the defects that an ac overvoltage protector is poor in reliability, slow in motion and complex in circuit in the current market, and is very suitable for loads such as lamps, electric heating and motors for over-voltage protection.

Description

Technical field [0001] The invention relates to an AC overvoltage protector, in particular to an AC overvoltage protector which uses a high-voltage field effect tube to safely shut down the overvoltage AC at high speed and restores power supply instantly after the high voltage passes to protect electrical appliances from being burned. Background technique [0002] At present, there are many kinds of AC overvoltage protection, some use varistors alone, some use relays to disconnect the AC circuit, some use field effect transistors as switches, and other forms of overvoltage protection. In the circuit using the varistor alone, although the varistor responds quickly, the varistor itself will burn out for a long period of overvoltage, and it is only suitable for instantaneous overvoltage pulse protection; when using a relay type overvoltage protector, when After the monitoring circuit detects the overvoltage, it sends out a signal to control the relay coil, and the coil generate...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of poor reliability, slow action, and complicated circuits of the current AC overvoltage protectors on the market, the present invention proposes a high-speed and safe AC overvoltage protector to solve this problem. The positive effect is: using a The high-speed and safe AC overvoltage protector can cut off the instantaneous high voltage in the circuit very quickly. When the high voltage passes, the power supply will be restored automatically in an instant. The circuit is simple, the cost is low, and it is easy to popularize.

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