Title:
スイッチング電源装置
Document Type and Number:
Japanese Patent JP5867141
Kind Code:
B2
Abstract:
In a switching power supply device having low loss in synchronous rectifying switches, exhibiting high power efficiency, and not causing troubles by reverse current in the switches. A secondary control circuit includes a reference voltage circuit to generate a reference voltage having a predetermined potential, and an ON-timing detector circuit to detect an ON timing of a synchronous rectifying switch through monitoring of a terminal voltage of the switch, an OFF-timing detector circuit to detect an OFF timing of the switch, and a timer circuit to be turned on at the ON timing and measure a predetermined period. The threshold voltage consisting of the reference voltage generated by the reference voltage circuit and an offset voltage is applied to the OFF-timing detector circuit during the measurement of the timer circuit, and the threshold voltage consisting of the reference voltage is applied to the OFF-timing detector circuit during the non-measurement.
Inventors:
Hyuga Temple Takumi
Naoto Endo
Naoto Endo
Application Number:
JP2012032447A
Publication Date:
February 24, 2016
Filing Date:
February 17, 2012
Export Citation:
Assignee:
MITSUMI ELECTRIC CO.,LTD.
International Classes:
H02M3/28; H02M1/00
Domestic Patent References:
| JP2010161917A | ||||
| JP2009273329A | ||||
| JP2009278717A | ||||
| JP2010098935A |
Foreign References:
| US20110096578 |
Attorney, Agent or Firm:
Hiroshi Arafune
Yoshio Arafune
Yoshio Arafune