Title:
SWITCHING POWER SUPPLY DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/021821
Kind Code:
A1
Abstract:
In an embodiment according to the present disclosure, a switching power supply device 1 is provided with a low-side switch 6 which is disposed in a reverse flow path through which, when a short to power occurs at an output terminal VOUT, current flows reversely from the terminal to an inductor 3. The low-side switch 6 is used for performing synchronous rectification in association with a step-down switching operation. An input low-voltage detection unit 7 outputs an input low-voltage detection signal when a power supply voltage VIN becomes lower than a threshold voltage V1. An output high-voltage detection unit 8 outputs an output high-voltage detection signal when an output voltage VOUT becomes greater than a threshold voltage V2. A pulse generation unit 10 turns off the switch 6 to prevent the reverse flow of current when the input low-voltage detection signal or the output high-voltage detection signal has been output.
Inventors:
ASAHI TAKASHI (JP)
Application Number:
PCT/JP2019/019302
Publication Date:
January 30, 2020
Filing Date:
May 15, 2019
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
H02M3/155
Foreign References:
| JP2013143831A | 2013-07-22 | |||
| JP2009171741A | 2009-07-30 | |||
| JP2011050221A | 2011-03-10 |
Attorney, Agent or Firm:
SATO INTERNATIONAL PATENT FIRM (JP)
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