Title:
SWITCHING POWER SOURCE DEVICE
Document Type and Number:
Japanese Patent JP2017147854
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To reduce loss and noise that occur during recovery from switching stop under burst control to a switching operation.SOLUTION: In a period of time that switching is stopped under burst control, an LC resonance circuit including parasitic capacitance connected to a switching element in parallel resonates, and a high-side reference voltage VS vibrates. In a VS bottom detection circuit 28, each time a high-side reference voltage detection signal vs_det decreases below a reference voltage Vvs_ref having the value of the center of its peak value, a comparator 41 outputs an H-level signal. After a counter circuit 42 counts a predetermined number of H-level signals, a delay circuit 43 delays by the time of 1/4 of an oscillation period of the high-side reference voltage VS, and outputs a switching recovery signal bur_sw_on when reaching a VS bottom. Carrying out the recovery of a switching operation with this timing enables decrease in loss and noise.SELECTED DRAWING: Figure 2
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Inventors:
CHIN KEN
Application Number:
JP2016028016A
Publication Date:
August 24, 2017
Filing Date:
February 17, 2016
Export Citation:
Assignee:
FUJI ELECTRIC CO LTD
International Classes:
H02M3/28
Domestic Patent References:
| JP2007538487A | 2007-12-27 | |||
| JP2012105424A | 2012-05-31 | |||
| JP2016052161A | 2016-04-11 | |||
| JP2015104246A | 2015-06-04 |
Foreign References:
| WO2010119760A1 | 2010-10-21 |
Attorney, Agent or Firm:
Takeshi Hattori