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Protection circuit for preventing transient inrush current of relay

A technology for transient inrush current and protection circuit, which is applied in the field of protection circuit against transient inrush current of relays, can solve problems such as sticking failure of relay contacts, and achieves the effects of reliable current limiting, simple and reliable control, and low overall cost.

Pending Publication Date: 2019-09-20
TBB POWER XIAMEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a protection circuit against relay transient surge current, which can effectively solve the problem of relay contact sticking failure caused by excessive transient surge current

Method used

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  • Protection circuit for preventing transient inrush current of relay

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Embodiment Construction

[0013] Such as figure 1 As shown, the present invention discloses a protection circuit against relay transient surge current, which includes a relay bypass buffer unit 1, a relay pull-in voltage judgment and control circuit 2, an output capacitor C4, and one end of the capacitor C4 is connected to the output end of the relay OUTPUT, the other end is grounded.

[0014] The relay bypass buffer unit 1 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a PNP transistor Q1 and an NPN transistor Q2, wherein one end of the resistor R1 is connected to the control signal input terminal CON_RLY, and the other end is connected to the base of the PNP transistor Q2. The resistor R2 is connected in parallel with the capacitor C1, one end of which is connected to the base of the PNP transistor Q2, and the other end is grounded; the emitter of the PNP transistor Q2 is grounded, and the collector is connected to the base of the NPN transistor Q1 through the re...

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Abstract

The invention relates to a protection circuit for preventing transient inrush current of a relay. The protection circuit controls the transient inrush current of the relay during pulling-in through a relay bypass buffer unit, a relay pull-in voltage judging and controlling unit and an output capacitor C4 so as to prevent relay contacts from sticking. Moreover, energy-consuming devices such as NTC and PTC are not used as current limiting devices on the relay bypass buffer unit, and instead, the collector current limiting characteristics of a triode is utilized, so current limiting is more reliable, and backend equipment is effectively protected from the influence by too-large or uncontrollable impact current.

Description

technical field [0001] The invention relates to the field of electric and electronic technology, in particular to a protection circuit for preventing relay transient surge current. Background technique [0002] In the electrical system, relays are used to control the power supply of some auxiliary equipment, so as to achieve the purpose of energy saving. However, in the process of controlling the pull-in of the relay, because the back-end equipment is unknown, it may cause the moment of the pull-in of the relay, and the excessive inrush current will cause the relay contacts to stick and fail. [0003] In view of this, the designer made in-depth ideas on the problems existing in the relay output control circuit, and then developed the present invention. Contents of the invention [0004] The object of the present invention is to provide a protection circuit against relay transient surge current, which can effectively solve the problem of relay contact sticking failure caus...

Claims

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Application Information

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IPC IPC(8): H01H47/00H02H9/02
CPCH01H47/002H02H9/02
Inventor 黄远鹏张凌涛
Owner TBB POWER XIAMEN CO LTD
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