US 12,438,444 B2
Electric-power conversion apparatus
Ryo Shinohara, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
Filed on Sep. 19, 2023, as Appl. No. 18/469,678.
Claims priority of application No. 2022-172001 (JP), filed on Oct. 27, 2022.
Prior Publication US 2024/0146182 A1, May 2, 2024
Int. Cl. H02M 1/32 (2007.01); H02M 7/00 (2006.01); H02M 7/48 (2007.01); H02M 7/5387 (2007.01); H05K 7/20 (2006.01)
CPC H02M 1/327 (2021.05) [H02M 7/003 (2013.01); H02M 7/48 (2013.01); H02M 7/53871 (2013.01); H02M 7/53873 (2013.01); H05K 7/20927 (2013.01); H05K 7/20945 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An electric-power conversion apparatus, comprising:
switching devices that each permit a current to flow therethrough or shut off that current;
at least one device temperature detector that detects a temperature of one or more of the switching devices;
a cooler that cools down the switching devices;
a cooling-medium state detector that detects a state of a cooling medium passing through the cooler; and
a controller that controls the switching devices to thereby perform electric-power conversion, and that performs overheat prevention control of the switching devices;
wherein the controller determines a temperature threshold value to be used for judging whether the overheat prevention control is necessary or not, on a basis of the state of the cooling medium detected by the cooling-medium state detector; and when the temperature detected by said at least one device temperature detector is higher than the temperature threshold value, the controller performs the overheat prevention control by restricting operations of the switching devices.