Title:
CONTROL CIRCUIT FOR CONTACTOR
Document Type and Number:
WIPO Patent Application WO/2020/114247
Kind Code:
A1
Abstract:
Disclosed in the present invention is a control circuit for a contactor, comprising a voltage detection circuit and a duty cycle control circuit. The voltage detection circuit first reduces a bus voltage to an appropriate range by means of a voltage dividing resistor, and then filters out an alternating current component by means of a low-pass filter. The remaining direct current component is used as an output of the voltage detection circuit, and the output voltage is recorded as VS. The duty cycle control circuit outputs a duty cycle D by means of detecting the output voltage VS, VS×D is recorded as KD, and KD is a constant that is set at an inner part of the duty cycle control circuit. In the present invention, setting KD as a constant may enable the contactor coil current to not change in a wide input range, so that when a PF value of a contactor power saver is increased, a bus capacitor and a sampling resistor therein may be removed, and the average value of the contactor coil current does not change within a wide voltage alternating current/direct current input voltage range.
Inventors:
SU JUNXI (CN)
FU WEI (CN)
FU WEI (CN)
Application Number:
PCT/CN2019/119576
Publication Date:
June 11, 2020
Filing Date:
November 20, 2019
Export Citation:
Assignee:
MORNSUN GUANGZHOU SCI & TECH (CN)
International Classes:
H01H47/32
Foreign References:
| CN109585223A | 2019-04-05 | |||
| CN107834839A | 2018-03-23 | |||
| CN201229512Y | 2009-04-29 | |||
| CN106208668A | 2016-12-07 | |||
| EP2546989A1 | 2013-01-16 |
Attorney, Agent or Firm:
GUANGZHOU ZHIYOU PATENT & TRADEMARK AGENCY CO., LTD. (CN)
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