Title:
スイッチング電源装置
Document Type and Number:
Japanese Patent JP6487517
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a switching power supply which can reduce a harmonic noise.SOLUTION: The switching power supply switches on/off a switching element by PWM control, to control a current which flows through a coil so as to obtain a desired DC voltage. In a first period immediately after the start of a PWM ON period during a PWM ON period to cause a switching element to be switched on by the PWM control, the switching power supply can perform the switching of the switching element by a first pulse signal having a gradually increased pulse width in a shorter period than the PWM period. Further, after the lapse of the first period in the PWM ON period, the switching power supply can perform the switching of the switching element by the PWM signal based on the PWM control. Thus, a harmonic noise can be reduced.SELECTED DRAWING: Figure 3
Inventors:
Noriya Takeya
Masashi Oshiba
Satoshi Kumaki
Yasutaka Horikoshi
Masashi Oshiba
Satoshi Kumaki
Yasutaka Horikoshi
Application Number:
JP2017204849A
Publication Date:
March 20, 2019
Filing Date:
October 24, 2017
Export Citation:
Assignee:
Renesas Electronics Corporation
International Classes:
H02M3/155; H02M1/08; H02M7/12
Domestic Patent References:
| JP2015165768A | ||||
| JP6038539A | ||||
| JP61227678A | ||||
| JP2001327166A | ||||
| JP2008312355A | ||||
| JP2008099440A |
Attorney, Agent or Firm:
Polaire Patent Business Corporation