US 12,255,202 B2
Short circuit detection apparatus
Chiharu Morisaki, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
Filed on Jul. 25, 2022, as Appl. No. 17/872,356.
Claims priority of application No. 2021-172828 (JP), filed on Oct. 22, 2021.
Prior Publication US 2023/0126872 A1, Apr. 27, 2023
Int. Cl. H01L 27/02 (2006.01); H01L 27/06 (2006.01); H02H 3/02 (2006.01); H02H 3/20 (2006.01)
CPC H01L 27/0288 (2013.01) [H01L 27/0682 (2013.01); H02H 3/023 (2013.01); H02H 3/202 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A short circuit detection apparatus, comprising:
a capacitor connected to a high potential side of a semiconductor switching device via a diode and a resistor connected in series;
a short circuit determination circuit that detects a terminal voltage of one terminal of the capacitor, and determines that the semiconductor switching device has short-circuited when the terminal voltage is equal to or greater than a threshold voltage; and
a voltage control circuit that is provided between another terminal of the capacitor and a low potential side of the semiconductor switching device, switches between a conduction and an interruption of the capacitor and the semiconductor switching device, and applies an offset voltage between the capacitor and the semiconductor switching device when conducting.