US 12,272,941 B2
Overcurrent protection circuit and power converter
Noriyuki Nosaka, Kyoto (JP); Hironori Tauchi, Kyoto (JP); and Takuro Hashimoto, Kyoto (JP)
Assigned to OMRON CORPORATION, Kyoto (JP)
Appl. No. 18/042,622
Filed by OMRON Corporation, Kyoto (JP)
PCT Filed Aug. 20, 2021, PCT No. PCT/JP2021/030651
§ 371(c)(1), (2) Date Feb. 23, 2023,
PCT Pub. No. WO2022/054546, PCT Pub. Date Mar. 17, 2022.
Claims priority of application No. 2020-152063 (JP), filed on Sep. 10, 2020.
Prior Publication US 2023/0361555 A1, Nov. 9, 2023
Int. Cl. H02H 7/12 (2006.01)
CPC H02H 7/12 (2013.01) 5 Claims
OG exemplary drawing
 
1. An overcurrent protection circuit for a switching device including a first terminal to receive a control signal input into the first terminal, and a second terminal and a third terminal to be electrically connected to each other or electrically disconnected from each other based on the input control signal, the overcurrent protection circuit comprising:
a first switching element including a fourth terminal to receive an input of a predetermined threshold voltage, a sixth terminal connected to the first terminal of the switching device, and a fifth terminal;
a second switching element including a seventh terminal connected to the fifth terminal of the first switching element, an eighth terminal connected to the fourth terminal, and a ninth terminal;
a first resistance having one end directly connected to the fifth terminal of the first switching element; and
a first diode including an anode terminal directly connected to another end of the first resistance and a cathode terminal directly connected to the fourth terminal of the first switching element,
wherein the first switching element electrically connects the sixth terminal and the fifth terminal in response to detecting a voltage value between the first terminal and the third terminal of the switching device exceeding a predetermined threshold based on the predetermined threshold voltage input into the fourth terminal,
the second switching element electrically connects, in response to the sixth terminal and the fifth terminal of the first switching element being electrically connected to each other, the eighth terminal and the ninth terminal to lower the predetermined threshold voltage input into the fourth terminal of the first switching element, and
the first switching element controls a current flowing into the eighth terminal of the second switching element with the sixth terminal and the fifth terminal electrically connected to each other.