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Relay protection circuit

A technology of relay protection and relay, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of relay contact damage, failure, damaged relay, etc.

Active Publication Date: 2012-07-18
GUANGZHOU FINEART LIGHTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When many lamps are in a cold state, the resistance is very small, almost close to an instantaneous short circuit, and the current is 5 times to 10 times larger than the normal operation when starting, so it is easy to cause damage to the relay contacts in the control circuit in an instant, causing the controller to fail. shortened life, failure
Especially the motor load is greater at the moment of starting, so it is easy to damage the relay

Method used

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Embodiment Construction

[0012] refer to figure 1 As shown, the relay protection circuit of the present invention includes a controller, a first NAND gate, a second NAND gate, a first delay circuit, a second delay circuit, a triode Q2, a photoelectric isolator, a thyristor, a relay RLY1 and relay RLY2; the delay circuit includes a resistor R, a diode D and a capacitor C, one end of the resistor R is connected to the positive pole of the diode D, the other end is connected to the negative pole of the diode D, and the positive pole of the capacitor C is connected to the negative pole of the diode D , the negative pole of the capacitor is grounded, wherein the positive pole of the diode D is the input terminal of the delay circuit, and the negative pole is the output terminal of the delay circuit; the drive signal circuit includes the third NAND gate and the fourth NAND gate, and the third NAND gate The input terminal and the output terminal are respectively connected with the output terminal of the dela...

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Abstract

The invention discloses a relay protection circuit, which comprises a controller, a first nand gate, a second nand gate, a first delay circuit, a second delay circuit, a signal drive circuit, a triode Q2, a photoelectric isolator, a silicon controlled rectifier, a first relay RLY 1 and a second relay RLY 2, wherein the elements are connected to form the circuit. The relay protection circuit has the advantages that as two delay circuits are arranged in the circuit to be matched with other elements, the electricity-passing-time of contacts of the relays is delayed relative to the closing time of the contacts, so that the phenomena that the contacts of the relays are electrified immediately when the relays are in contact and contact splashing matters are produced are avoided.

Description

technical field [0001] The invention relates to a protection circuit for a relay in a controller of an intelligent lighting control system. Background technique [0002] In the control of equipment such as motors or lights, many circuits are connected in parallel by several load units, so that the load power is very large, and the power is as high as 2000W-3000W. Because contact spatters are easy to be generated when a large load is switched on and off, they will adhere to the contacts. The greater the current, the easier it is to cause the contacts to stick and cannot be disconnected. [0003] When many lamps are in a cold state, the resistance is very small, almost close to an instantaneous short circuit, and the current is 5 times to 10 times larger than the normal operation when starting, so it is easy to cause damage to the relay contacts in the control circuit in an instant, causing the controller to fail. Shortened lifespan, failure. Especially the motor load is gre...

Claims

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Application Information

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IPC IPC(8): H02H7/22
Inventor 刘建华
Owner GUANGZHOU FINEART LIGHTING
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