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Neutral electrode interconnection voltage-sensitive surge over-voltage protection circuit

A technology for protecting circuits and neutral electrodes, applied in the field of electronics, can solve the problems of shortened life and accelerated aging, and achieve the effects of reducing residual voltage, reducing costs, and prolonging the life of protection circuits.

Active Publication Date: 2017-05-17
SHENZHEN CHENJU ELECTRONICS TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The greater the Rap, the more severe the stress, which means accelerated aging and shortened lifespan

Method used

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  • Neutral electrode interconnection voltage-sensitive surge over-voltage protection circuit
  • Neutral electrode interconnection voltage-sensitive surge over-voltage protection circuit
  • Neutral electrode interconnection voltage-sensitive surge over-voltage protection circuit

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Embodiment Construction

[0043] The purpose of the invention is to improve the tolerance and impact current resistance of the pressure sensitive device, reduce the residual voltage, greatly reduce the cost of the protected circuit, and prolong the service life of the protection circuit.

[0044]Therefore, we should understand the principle involved in the surge overvoltage protection circuit of the varistor, that is, the concentration effect of the current and the negative thermal resistance effect. The so-called current concentration effect means that in the L-type lead varistor, the current spreads to the surrounding through the center line, and the current at the center point is relatively concentrated. The so-called negative thermal resistance effect means that the larger the flow rate of the varistor, the higher the local temperature and the smaller the resistance. When the heat dissipation capacity is less than the heat generation capacity, the positive feedback will cause the varistor to melt t...

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Abstract

A neutral electrode interconnection voltage-sensitive surge over-voltage protection circuit comprises more than two piezoresistors which are in parallel connection, series connection or series-parallel connection. The piezoresistors meet specified requirements, and the surge over-voltage protection circuit also meets specified requirements. Tolerance and impact current resistance of voltage-sensitive devices can be improved, residual voltage is greatly reduced, the cost of a protected circuit is greatly reduced, and the service life of the protection circuit is prolonged.

Description

[0001] Technical field: [0002] The invention belongs to the field of electronic technology, in particular to related technologies of overvoltage protection. [0003] technical background: [0004] Electronic products are inseparable from surge voltage protection. As the main component of today's surge voltage protection, ZnO varistors came out in the late 1960s, and their usage has grown synchronously with electronic information products. In the 220 (240) V power frequency power supply circuit, people initially used a varistor with a varistor voltage (Un) of 470V, and its residual voltage (limited voltage) under the nominal discharge current is roughly 1100V. But they caught fire at the scene of use, causing accidents with serious consequences to happen from time to time. So the specifications of the piezoresistors in the 220 (240) V circuit are gradually increased to Un being 620V and 680V. This measure is effective and greatly reduces the probability of fire accidents, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
CPCH02H9/04
Inventor 肖小驹
Owner SHENZHEN CHENJU ELECTRONICS TECH LTD
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