Title:
SWITCHING POWER SUPPLY DEVICE
Document Type and Number:
Japanese Patent JP2020054100
Kind Code:
A
Abstract:
To provide a switching power supply device capable of stably supplying power by suppressing an output stop accompanied by a protective function for steep input/output variations.SOLUTION: A switching power supply device 1 includes: a switching circuit 10; and a control circuit 20 that includes a PWM control unit 21 that performs PWM control based on an output voltage V, and shuts down when the output voltage Vexceeds a latch off threshold V. The control circuit 20 includes: a voltage limit comparator 24 for comparing the output voltage Vof the switching circuit 10 with a voltage limit value V, and a PWM skip setting unit 22 for skipping a pulse when the output voltage Vis equal to or larger than the voltage limit value V. After the pulse skip, the PWM control unit 21 resumes a pulse output with a recovery duty ratio Dsmaller than an immediately preceding duty ratio Dbefore the output voltage Vdrops below a target voltage V.SELECTED DRAWING: Figure 1
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Inventors:
HAMADA KENJI
WATANABE HIDEAKI
BITAANAGE ANANDA
TAN CHENG GIAM
WATANABE HIDEAKI
BITAANAGE ANANDA
TAN CHENG GIAM
Application Number:
JP2018180776A
Publication Date:
April 02, 2020
Filing Date:
September 26, 2018
Export Citation:
Assignee:
FDK CORP
International Classes:
H02M3/155
Domestic Patent References:
| JP2012175868A | 2012-09-10 | |||
| JP2012010577A | 2012-01-12 | |||
| JP2017118769A | 2017-06-29 | |||
| JP2004194452A | 2004-07-08 |
Foreign References:
| US20070008748A1 | 2007-01-11 | |||
| US20140112035A1 | 2014-04-24 |
Attorney, Agent or Firm:
Koji Nagato