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Control circuit for electromagnet of low-tension switch electric appliance

A low-voltage switch and control circuit technology, applied to circuits, relays, electrical components, etc., to achieve the effects of prolonging working life, reducing energy consumption, and reducing volume

Active Publication Date: 2009-05-27
SEARI ELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This circuit has current feedback, no Va voltage detection feedback

Method used

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  • Control circuit for electromagnet of low-tension switch electric appliance
  • Control circuit for electromagnet of low-tension switch electric appliance
  • Control circuit for electromagnet of low-tension switch electric appliance

Examples

Experimental program
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Embodiment Construction

[0014] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] figure 1 It is the principle diagram of the electromagnet control circuit of the invention patent CN99122868 for low-voltage switching appliances. It has been explained in the background technology, and will not be repeated here.

[0016] Referring to Fig. 2, this is a block diagram of the hardware principle of the electromagnet control circuit of the low-voltage switchgear of the present invention.

[0017] The electromagnet control circuit includes an external AC power input 1, a rectification filter circuit 2, a self-feedback pulse width modulation and IGBT drive circuit 3, a start-up delay circuit 4, an input voltage sampling circuit 5, a control chip circuit 6, and an electromagnet 7 .

[0018] The signal transmission between the above circuits: the external AC power input 1 is rectified and filtered by the rectification and filter circ...

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PUM

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Abstract

The invention relates to an electromagnet control circuit for low voltage switch electric appliances, which comprises an electromagnet, an external AC power input circuit, a rectifier and filtering circuit, a self-feedback pulse-width modulation and IGBT drive circuit, a starting delay circuit, an input voltage sampling circuit, and a control chip MCU circuit. The signal transmission of the circuits is: the self-feedback pulse-width modulation and IGBT drive circuit modulates and outputs pulse width according to load of the electromagnet, so as to control attraction and release of the electromagnet; the starting delay circuit adjusts feedback resistance value at the attraction moment aiming at the condition that the electromagnet needs heavy current at the attraction moment and keeps low current after the attraction, so as to adjust pulse width of output voltage to provide starting heavy current for the electromagnet; when the starting time is up, the starting delay circuit adjusts the feedback resistance value to adjust the pulse width of the output voltage, so as to provide maintaining low current for the electromagnet; and the input voltage sampling circuit detects external AC power input, transforms a voltage signal into a frequency signal through a V / f converting agent, and transmits the signal to the control chip MCU.

Description

technical field [0001] The invention relates to an electromagnet control circuit for a low-voltage switching device, which is used in conjunction with a corresponding switching device and belongs to the technical field of low-voltage devices. Background technique [0002] The electromagnet control circuit is an important circuit of contactor products in the field of low-voltage electrical appliances. The circuit controls the pull-in or release of the electromagnet by controlling the current, so that the dynamic and static contacts of the contactor products produce corresponding on-off sports. [0003] At present, the electromagnet control circuits of most switching appliances in China adopt full-voltage simple on-off control, which is simple to control and low in cost, but the electromagnet has a large kinetic force, which may easily cause contact bouncing and cause contact burnout; in addition, the full-voltage simple on-off control electromagnetic The energy consumption o...

Claims

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Application Information

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IPC IPC(8): H01H47/02
Inventor 朱文灏邵福山曾萍胡景泰
Owner SEARI ELECTRIC TECH
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