Title:
POWER-FACTOR-IMPROVING PWM CONTROL DEVICE FOR SWITCHING POWER SUPPLY
Document Type and Number:
WIPO Patent Application WO/2019/135391
Kind Code:
A1
Abstract:
Provided is a PWM control device that is for a switching power supply that has high output and a favorable power factor. A PWM control device that outputs a PWM signal to perform ON/OFF control of a switching element of a switching power supply that is configured to be capable of outputting current during both ON periods and OFF periods for the switching element. The PWM control device has: an input voltage detection part that detects an input voltage for the switching power supply; an input current detection part that detects an input current for the switching power supply; a difference outputting part that outputs a control voltage that corresponds to the difference between numerical values that are respectively proportional to the detected input voltage and input current; and a PWMIC that receives the control voltage as input and outputs a PWM signal that has ON periods that are proportional to the magnitude of the control voltage.
Inventors:
HANEDA MASAJI (JP)
Application Number:
PCT/JP2018/048200
Publication Date:
July 11, 2019
Filing Date:
December 27, 2018
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
H02M3/28; H02M3/155; H02M7/12
Foreign References:
| JP2012139101A | 2012-07-19 | |||
| JP2013090491A | 2013-05-13 | |||
| JPH0662568A | 1994-03-04 | |||
| JP2017221073A | 2017-12-14 |
Attorney, Agent or Firm:
KOJIMA Takiro (JP)
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