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Relay drive method and device for protecting relay contact

A technology for protecting relays and driving devices, applied in the field of circuits, can solve problems such as cost increase and breakdown, and achieve the effect of low cost

Inactive Publication Date: 2012-09-05
SHENZHEN H&T INTELLIGENT CONTROL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method needs to make changes to the switching elements, and in many cases, the replacement of the thyristor will bring some problems, such as the ability to carry the load, the thyristor needs to add a heat sink when its power is slightly larger, and the cost It will increase, need to consider breakdown issues, EMC issues, etc.

Method used

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  • Relay drive method and device for protecting relay contact
  • Relay drive method and device for protecting relay contact
  • Relay drive method and device for protecting relay contact

Examples

Experimental program
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Embodiment Construction

[0020] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0021] Such as figure 1 As shown, in the relay driving method and device embodiment of the protection relay contact of the present invention, the method includes the following steps:

[0022] Step S11 Write the content of the control signal driving the relay into the specified register: Generally speaking, the control signal of the relay is a level control signal. When the level applied to the coil of the relay is high, the coil has current flowing, and the The contacts are energized and closed; when the level applied to the relay coil is low, no current flows through the coil, and the contacts of the relay are de-energized and disconnected. Combined with the driving circuit of the relay, in this embodiment, when the level reflected to the output port of the relay control signal is also high, the relay contacts are closed, and when the level is low, the...

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PUM

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Abstract

The invention relates to a relay drive method for protecting a relay contact, which comprises following steps of: storing output signal content controlling a relay in a set register by a control device of the relay; judging if an external interrupt port thereof is a specified level by the control device, if so, executing next step, and if not so, returning to this step; and reading and outputtingthe content of the set register. The invention also relates to a relay drive device for protecting a relay contact. The relay drive method and device for protecting a relay contact have the advantagethat when the relay contact acts, because voltage thereof is zero or close to zero, no firing is caused to generate arc to disturb external electrical equipment.

Description

technical field [0001] The invention relates to the field of circuits, more specifically, to a relay driving method and device for protecting relay contacts. Background technique [0002] Relays are used a lot in power control circuits, mainly used as switches to control some power output. But generally it is only turned on immediately when the load needs to be output and turned off immediately when it needs to be turned off. This control method can easily cause the relay contacts to sinter, shorten the service life of the relay, and also cause arc interference to the circuit. The usual solution is to use a thyristor instead of a relay, and implement a zero-crossing trigger on the thyristor. But this method needs to make changes to the switching elements, and in many cases, the replacement of the thyristor will bring some problems, such as the ability to carry the load, the thyristor needs to add a heat sink when its power is slightly larger, and the cost It will incr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H47/02
Inventor 龙逸邓永忠
Owner SHENZHEN H&T INTELLIGENT CONTROL