The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 2022
Filed:
Mar. 08, 2019
Sumitomo Wiring Systems, Ltd., Yokkaichi, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Shinji Aoyama, Yokkaichi, JP;
Hiroshi Kimoto, Yokkaichi, JP;
Shinji Oshita, Toyota, JP;
Nobutoshi Hagiwara, Miyoshi, JP;
Kenichi Takayoshi, Nisshin, JP;
Hiroki Onoyama, Nishio, JP;
Takumi Matsumoto, Nagakute, JP;
SUMITOMO WIRING SYSTEMS, LTD., Yokkaichi, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;
Abstract
A relay driver circuit is connected between an upper stage relay and a lower stage relay and is configured to be driven in response to driving of the upper relay. The relay driver circuit drives the lower stage relay. The relay driver circuit includes a semiconductor component, a control input line, a protective component, and a buffer circuit. The semiconductor component switches on and off the lower relay. The control input line is electrically connected to a control terminal of the semiconductor component. A power supply voltage is applied to the control input line via the upper stage relay. The protective component is connected in the control input line to protect the semiconductor component. The buffer circuit is connected between the protective component in the control input line and the control terminal of the semiconductor component to compensate for a voltage drop due to the protective component.