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:
Nov. 19, 2019
Filed:
Aug. 10, 2018
Rohm Co., Ltd., Kyoto, JP;
Hiroki Kikuchi, Kyoto, JP;
ROHM CO., LTD., Tokyo, JP;
Abstract
A secondary controller drives a light emitting element of a photocoupler such that a detection voltage Vcorresponding to an output voltage Vgenerated in an output capacitor C approximates to a reference voltage V. A primary controller controls a switching transistor M according to a feedback signal V. A protection circuit is activated and drives the light emitting element of the photocoupler when detecting an abnormal state. An auxiliary power supply circuit includes a power supply capacitor C provided separately from the output capacitor C and supplies a power supply voltage Vto the protection circuit and an anode of the light emitting element of the photocoupler.