US 12,322,950 B2
Control apparatus and switching apparatus for short circuit protection
Takahiro Mori, Matsumoto (JP)
Assigned to FUJI ELECTRIC CO., LTD., Kanagawa (JP)
Filed by FUJI ELECTRIC CO., LTD., Kanagawa (JP)
Filed on May 18, 2022, as Appl. No. 17/747,980.
Claims priority of application No. 2021-117120 (JP), filed on Jul. 15, 2021.
Prior Publication US 2023/0016546 A1, Jan. 19, 2023
Int. Cl. H02M 1/32 (2007.01); H02H 3/027 (2006.01); H02H 3/093 (2006.01); H02M 1/08 (2006.01)
CPC H02H 3/027 (2013.01) [H02H 3/093 (2013.01); H02M 1/08 (2013.01); H02M 1/32 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A control apparatus comprising:
a sensing unit configured to output a short circuit sensing signal in response to sensing, in a turn-on period of a main switching device by a switching device for on control, of short circuit of the main switching device;
a protection operation control unit configured to output an instruction signal of a short circuit protection operation at delayed timing relative to the short circuit sensing signal; and
a protection unit configured to turn off the switching device for on control in response to the instruction signal,
wherein the protection operation control unit is configured to delay the short circuit sensing signal to timing at which turn-on of the main switching device is completed or later to be output as the instruction signal,
wherein the sensing unit is configured to output the short circuit sensing signal in response to a state where a parameter according to a current flowing in the main switching device exceeds a first threshold, and
wherein the protection operation control unit is configured to output the instruction signal in response to a state where the parameter exceeds a second threshold higher than the first threshold.