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Patent Searching and Data


Title:
CONTROLLER AND CONTROL METHOD FOR ALTERNATING CURRENT CONTACTOR
Document Type and Number:
WIPO Patent Application WO/2016/015590
Kind Code:
A1
Abstract:
A controller for an alternating current contactor. The controller comprises: a filtering and rectification circuit (101, 102), which filters and rectifies external alternating current; an electromagnet component (103), which is driven by the output of the filtering and rectification circuit and performs an attraction, holding or releasing action; a power transistor circuit (104), which is connected to the electromagnet component; and a microcontroller (112), which controls on or off of the power transistor circuit to control the electromagnet component to perform the attraction, holding or releasing action. The controller further comprises: a voltage control loop, which provides a voltage feedback signal to the microcontroller so that the microcontroller generates a control signal according to the voltage feedback signal, wherein the control signal is a PWM control signal having different duty cycles during the attraction and holding of the electromagnet component so that the current does not exceed a predetermined current threshold during the attraction and holding of the electromagnet component; and a current control loop, which provides a current feedback signal to the microcontroller so that the microcontroller turns off the power transistor circuit upon detecting an overcurrent exceeding the current threshold.

Inventors:
YU FEI (CN)
GU CHANGXUN (CN)
GE SHUNFENG (CN)
ZHANG DI (CN)
FENG YUGANG (CN)
SHI YAWEN (CN)
ZENG PING (CN)
Application Number:
PCT/CN2015/084895
Publication Date:
February 04, 2016
Filing Date:
July 23, 2015
Export Citation:
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Assignee:
SEARI ELECTRIC TECHNOLOGY CO LTD (CN)
ZHEJIANG CHINT ELECTRICS CO LTD (CN)
International Classes:
H01H47/02
Foreign References:
CN102315043A2012-01-11
CN101261908A2008-09-10
CN102163518A2011-08-24
US20040207377A12004-10-21
JP2009289690A2009-12-10
Other References:
See also references of EP 3176803A1
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
上海专利商标事务所有限公司 (CN)
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