US 12,413,220 B2
Drive circuit of switching element and intelligent power module
Eiji Kurosawa, Nagano (JP)
Assigned to FUJI ELECTRIC CO., LTD., Kawasaki (JP)
Filed by FUJI ELECTRIC CO., LTD., Kawasaki (JP)
Filed on Mar. 27, 2023, as Appl. No. 18/190,522.
Claims priority of application No. 2022-087586 (JP), filed on May 30, 2022.
Prior Publication US 2023/0387904 A1, Nov. 30, 2023
Int. Cl. H03K 17/082 (2006.01); H03K 17/0812 (2006.01); H02P 27/06 (2006.01); H03K 17/08 (2006.01)
CPC H03K 17/08128 (2013.01) [H02P 27/06 (2013.01); H03K 2017/0806 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A drive circuit for a switching element comprising:
a constant current supply to receive an input signal from outside of the drive circuit and to supply constant current to a control signal input terminal of the switching element according to a signal level of the input signal;
a switching signal input terminal to receive a switching signal;
a signal level determiner, in communication with the switching signal input terminal, to determine a signal level of the switching signal by comparing the switching signal with a comparison signal; and
a drive capability switch, in communication with the signal level determiner and the constant current supply, to switch drive capability of the constant current supply by changing a current amount of the constant current supplied by the constant current supply based on a determination result in the signal level determiner and the signal level of the input signal, wherein
the switching element switches to an ON state according to the current amount of the constant current supplied to the switching element by the constant current supply.