US 12,354,818 B2
Relay control device
Taisuke Katakami, Anjo (JP); Yasuhiro Nagai, Anjo (JP); Tomoaki Tanaka, Anjo (JP); and Shingo Kurita, Kariya (JP)
Assigned to DENSO ELECTRONICS CORPORATION, Anjo (JP); and DENSO CORPORATION, Kariya (JP)
Filed by DENSO ELECTRONICS CORPORATION, Anjo (JP); and DENSO CORPORATION, Kariya (JP)
Filed on Aug. 29, 2023, as Appl. No. 18/457,933.
Application 18/457,933 is a continuation of application No. PCT/JP2022/017479, filed on Apr. 11, 2022.
Claims priority of application No. 2021-073527 (JP), filed on Apr. 23, 2021; and application No. 2022-023043 (JP), filed on Feb. 17, 2022.
Prior Publication US 2023/0411093 A1, Dec. 21, 2023
Int. Cl. H03K 17/687 (2006.01); B60L 58/10 (2019.01); H01H 47/00 (2006.01); H02J 7/00 (2006.01)
CPC H01H 47/002 (2013.01) [B60L 58/10 (2019.02); H02J 7/0029 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A relay control device controls an operation of a relay circuit, the relay circuit including a first main relay, a second main relay, and a pre-charge relay, the relay control device comprising
a microcomputer that controls on and off states of the first main relay, the second main relay, and the pre-charge relay,
wherein
the relay circuit is disposed between a battery and an electric load,
the battery has a first terminal and a second terminal as a pair of terminals,
the relay circuit is sealed in a case of a battery pack that includes the battery,
the first main relay is disposed in a first conduction path which is connected to the first terminal of the battery,
the second main relay is disposed in a second conduction path which is connected to the second terminal of the battery,
the pre-charge relay is connected to the second conduction path in parallel with the second main relay,
the microcomputer switches, at an arbitrary frequency, a first operation sequence and a second operation sequence,
in the first operation sequence, the microcomputer turns on the pre-charge relay, the first main relay, and the second main relay in order, and then turns off the pre-charge relay, the first main relay, and the second main relay in order, and
in the second operation sequence, the microcomputer turns on the first main relay, the pre-charge relay, and the second main relay in order, and then turns off the pre-charge relay, the first main relay, and the second main relay in order.