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Method for protecting contact point of relay in high-power circuit and protection circuit

A relay contact and protection circuit technology, applied in emergency protection circuit devices, relays, circuits, etc., can solve problems such as relay contact burnout, relay failure, user personal or property safety hazards, etc., to protect relay contacts, Avoid the effect of high current shock

Active Publication Date: 2009-11-11
深圳市英唐智能控制股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If these products rely solely on the relay switch to control the power on and off of the load, it is very easy to cause the contacts of the relay to burn out and even the relay to fail, which will directly cause hidden dangers to the personal or property safety of users.

Method used

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  • Method for protecting contact point of relay in high-power circuit and protection circuit
  • Method for protecting contact point of relay in high-power circuit and protection circuit
  • Method for protecting contact point of relay in high-power circuit and protection circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] figure 1 A first specific implementation manner of the protection circuit of the present invention is shown. This circuit is a protection circuit for an oven, and the high-power load in this circuit is the heating coil H.

[0019] The protection circuit includes a third resistor R3, an optocoupler U1, a thyristor TR1, a relay RY1, and a controller K; The T2 terminal of the silicon TR1 is connected to the phase line L of the AC power supply, and the T1 terminal of the thyristor TR1 is connected to the neutral line N of the AC power supply through the heating coil H; the G pole of the thyristor TR1 is connected to the first output terminal of the optocoupler U1 , the second output end of the optocoupler U1 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to the T2 end of the thyristor TR1, the control A pole of the optocoupler U1 is connected to the DC power supply, and the control pole of the optocoupler U1 The K pol...

Embodiment 2

[0025] figure 2 A second specific implementation manner of the protection circuit of the present invention is shown.

[0026] On the basis of Embodiment 1, the protection circuit also includes an RC absorbing circuit composed of a fourth resistor R4 and a capacitor C1, one end of the fourth resistor R4 is connected to the T2 end of the thyristor TR1, and the other end is connected to one end of the capacitor C1. The other end of the capacitor C1 is connected to the T1 end of the thyristor TR1. In this way, it is also possible to provide protection for the contacts of the relay when the heating coil H is out of operation.

[0027] The protection circuit protects the relay contacts as follows: before the relay RY1 is closed, firstly control the thyristor TR1 for soft start processing to preheat the heating coil H, and avoid a large current impact on the relay RY1 contacts. Before disconnecting the relay RY1, first turn on the thyristor TR1 and delay the shutdown, and use the ...

Embodiment 3

[0032] image 3 A third specific implementation manner of the protection circuit of the present invention is shown.

[0033]On the basis of Embodiment 2, the protection circuit also includes a first resistor R1, a second resistor R2, a fifth resistor R5, a diode D1, a first transistor Q1, and a second transistor Q2; the control of the optocoupler U1 The pole A is connected to the DC power supply through the second resistor R2; the emitter of the first triode Q1 is grounded, and the control pole K of the optocoupler U1 is connected to the I / O1 port of the controller K. The collector of a triode Q1, the base of the first triode Q1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to the I / O1 port of the controller K; the K pole of the diode D1 is connected to the VCC power supply , the A pole of the diode D1 is connected to the collector of the second triode Q2, the emitter of the second triode Q2 is grounded, and the connecti...

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Abstract

The invention provides a method for protecting a contact point of a relay in a high-power circuit. In the method, controllable silicon is adopted to be connected with the relay in the high-power circuit in parallel, and the controllable silicon is controlled to soften the starting treatment before the closing of the relay so as to preheat a high power load, thereby avoiding heavy current surge on the contact point of the relay. The invention also provides a protection circuit, comprising a resistor, an opto-coupler, the controllable silicon and the relay. By adopting the method and the protection circuit, the controllable silicon softens the starting treatment before the closing of the relay so as to preheat the load, thereby avoiding the heavy current surge caused by the reason that the cold resistance of the load is too low. The method and the protection circuit can be applied to circuits of an oven, a stove, an electrical motor and other high-power products, and can avoid the surge of heavy current and high voltage, thereby effectively protecting the contact point of the relay.

Description

【Technical field】 [0001] The invention relates to a relay, in particular to a method for protecting a relay contact and a protection circuit. 【Background technique】 [0002] In high-power products such as ovens and heaters, the rated power of the load (heating elements such as electric heating wires and heating pipes that emit heat after power-on) is between 500W and 3000W. The cold-state resistance of some loads is very small. (For example, 500 milliseconds) will generate a current greater than 50A; when the motor is started for high-power products such as motors, the starting current is very large, and when the motor is disconnected, a reverse voltage will be generated on the contacts. If these products rely solely on the relay switch to control the power on and off of the load, it is very easy to cause the contacts of the relay to burn out and even the relay to fail, which will directly cause hidden dangers to the personal or property safety of users. 【Content of invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H47/00H02H7/22
Inventor 曾建汝陈培智古远东
Owner 深圳市英唐智能控制股份有限公司
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