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:
Feb. 05, 2019
Filed:
Oct. 31, 2017
Renesas Electronics Corporation, Tokyo, JP;
Norisato Takeya, Tokyo, JP;
Masashi Oshiba, Tokyo, JP;
Satoshi Kumaki, Tokyo, JP;
Yasutaka Horikoshi, Tokyo, JP;
RENESAS ELECTRONICS CORPORATION, Tokyo, JP;
Abstract
A switching power source device for controlling a current flowing through a coil by turning on/off a switching element by a PWM control to obtain a desired DC voltage, includes in a PWM ON period to turn on the switching element by the PWM control, a switching control of the switching element is enabled by a first pulse signal whose cycle is shorter than a PWM cycle based on the PWM control and whose pulse width is gradually increased, in a first period just after the PWM ON period is started, and the switching control of the switching element is enabled by the PWM signal based on the PWM control after the first period has elapsed.