US 12,106,915 B2
Control circuit for contactor and its control method
Bing Shuang, Shanghai (CN); David Lanes, Rueil Malmaison (FR); and Vincent Geffroy, Shanghai (CN)
Assigned to Schneider Electric Industries SAS, Rueil Malmaison (FR)
Appl. No. 17/789,091
Filed by SCHNEIDER ELECTRIC INDUSTRIES SAS, Rueil Malmaison (FR)
PCT Filed Dec. 25, 2020, PCT No. PCT/CN2020/139489
§ 371(c)(1), (2) Date Jun. 24, 2022,
PCT Pub. No. WO2021/129814, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 201911370027.9 (CN), filed on Dec. 26, 2019.
Prior Publication US 2023/0040913 A1, Feb. 9, 2023
Int. Cl. H01H 47/00 (2006.01); H01H 47/22 (2006.01)
CPC H01H 47/005 (2013.01) [H01H 47/22 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A control circuit for a contactor, wherein the contactor comprises an excitation coil and a main contact coupled to the excitation coil, the control circuit comprising:
a pulse converter configured to convert a received turn-on control signal indicating to turn on the contactor into a continuous pulse signal;
a first controller connected to the pulse converter and configured to generate a first breaking control signal at a first time in response to detection of the disappearance of the continuous pulse signal received from the pulse converter;
a second controller connected to the pulse converter and in parallel with the first controller, the second controller being configured to generate a second breaking control signal at a second time in response to detection of the disappearance of the continuous pulse signal received from the pulse converter, wherein the first time is earlier than the second time; and
a coil driver connected to the first controller, the second controller and the excitation coil, and configured to turn off a current of the excitation coil according to the received first breaking control signal, and if the current is not turned off according to the first breaking control signal, to further turn off the current of the excitation coil according to the second breaking control signal, thereby realizing the breaking of the main contact.