Over-voltage over-current protector of electronic and electric equipment

An overvoltage and overcurrent, electronic and electrical technology, applied in the direction of emergency protection circuit devices, electrical components, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve the problem of high maintenance costs of equipment and network systems, rated current The value selection is too large, production and life are inconvenient, etc., to achieve good lightning protection effect, reduce failure rate, and save costs.

Active Publication Date: 2015-05-13
CHANGSHA FAYBO COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The power of these devices is usually only tens of watts, hundreds of watts (rated current value is less than 1A), and the rated current value of the power distribution switch of the front-end equipment is selected too high when a fault occurs (because the air switch configured to match the loa

Method used

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  • Over-voltage over-current protector of electronic and electric equipment
  • Over-voltage over-current protector of electronic and electric equipment
  • Over-voltage over-current protector of electronic and electric equipment

Examples

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[0023] In the prior art, ordinary surge protectors use ordinary B or C power surge protectors SPDI as an equipotential equalization device. The main purpose of the surge protector is when there is a lightning surge overvoltage on the line, the surge protector immediately Action to limit the surge overvoltage between LIN and NIN within a certain range, that is, the protection level Up of the B or C level surge protector (deemed as the residual voltage, because the protection level is based on the surge protector The residual pressure is determined by the maximum residual pressure). LIN and NIN are the power supply access ports from the power distribution panel, and LOUT and NOUT are connected to the ports of the protected equipment.

[0024] The present invention will be further explained below in conjunction with the drawings.

[0025] Such as figure 1 An overvoltage and overcurrent protector for electronic and electrical equipment shown includes a power surge protector SPDI1, a s...

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Abstract

The invention discloses an over-voltage over-current protector of electronic and electric equipment. The over-voltage over-current protector of the electronic and electric equipment comprises a power surge protective device SPD I, a surge voltage divider and a power frequency current protector, two ends of the power surge protective device SPDI are respectively connected with a live wire and a null line after a power supply distribution board access port and before a protected equipment port, the surge voltage divider is composed of an electric reactor A, a power surge protective device SPD II and an electric reactor B in a series mode, the electric reactor A at one end of the surge voltage divider is arranged on a live wire after the power surge protective device SPD I, the electric reactor B at the other end is arranged on a null line after the power surge protective device SPD I, and the power frequency current protector is composed of a PTC positive temperature coefficient thermistor, an NTC negative temperature coefficient thermistor and a TVS tube. The over-voltage over-current protector of the electronic and electric equipment has surge over-voltage limit and surge residual voltage division protection functions and power frequency over-voltage and over-current protection functions, enables the equipment fault rate to be reduced and enables the equipment aging speed to be lowered.

Description

technical field [0001] The invention relates to the technical field of power surge protectors, in particular to an overvoltage and overcurrent protector for electronic and electrical equipment with power frequency current protection. Background technique [0002] When the circuit is struck by lightning and when the inductive load or large load is turned on or off, a high operating overvoltage is often generated. This instantaneous overvoltage (or overcurrent) is called surge voltage (or surge current), which is A transient disturbance. Surge voltage phenomena are increasingly endangering the safe operation of automation equipment. Eliminating surge noise interference and preventing surge damage have always been the core issues related to the safe and reliable operation of automation equipment. [0003] Surge protective device (SPD for short), also called lightning protector, is a device that provides safety protection for various electrical equipment, instruments, communica...

Claims

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Application Information

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IPC IPC(8): H02H9/04H02H9/02
Inventor 曾学敏曾光
Owner CHANGSHA FAYBO COMM TECH
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