Title:
COIL CONTROL CIRCUIT OF CONTACTOR
Document Type and Number:
WIPO Patent Application WO/2020/034665
Kind Code:
A1
Abstract:
A coil control circuit of a contactor, comprising a freewheeling control circuit and a coil driving circuit. The coil driving circuit comprises an MOS transistor T1 and a PWM generator U3 for driving the MOS transistor T1. The drain of the MOS transistor T1 is connected to a contactor coil, and the source of the MOS transistor T1 is grounded to control electric connection and disconnection between the contactor coil and a contactor power supply. The freewheeling control circuit consists of a bidirectional switching device K1, an MOS transistor T2, and a freewheeling transistor driving circuit. A synchronous control signal of the freewheeling transistor driving circuit is provided by the coil driving circuit. In suction and holding phases of the contactor, the on-off state of the bidirectional switching device K1 of the freewheeling control circuit is complementary to that of the MOS transistor T1 of the coil driving circuit, that is, when the MOS transistor T1 is turned on, the bidirectional switching device K1 is turned off, and in this case, the contactor coil stores energy; when the MOS transistor T1 is turned off, the bidirectional switching device K1 is turned on, and the bidirectional switching device K1 provides a low-impedance freewheeling path for the contactor coil. The coil control circuit of the contactor reduces the loss of the contact coil in the holding phase while enabling the contactor to be quickly turned off.
Inventors:
YIN XIANGYANG (CN)
ZHAO QINGHONG (CN)
ZHAO QINGHONG (CN)
Application Number:
PCT/CN2019/084983
Publication Date:
February 20, 2020
Filing Date:
April 29, 2019
Export Citation:
Assignee:
MORNSUN GUANGZHOU SCI & TECH (CN)
International Classes:
H01H47/32
Foreign References:
| CN106024521A | 2016-10-12 | |||
| CN102262977A | 2011-11-30 | |||
| CN205303336U | 2016-06-08 | |||
| CN205490156U | 2016-08-17 | |||
| US5014180A | 1991-05-07 | |||
| CN108735552A | 2018-11-02 | |||
| CN208674002U | 2019-03-29 |
Attorney, Agent or Firm:
GUANGZHOU ZHIYOU PATENT & TRADEMARK AGENCY CO., LTD. (CN)
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