Title:
POWER SUPPLY DEVICE AND ELECTRONIC CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/195427
Kind Code:
A1
Abstract:
The power supply device comprises: a first linear regulator (12, 22) which receives a voltage supply from a direct-current power supply (2) at all times and outputs a first voltage; a step-down switching regulator (11) which receives the voltage from the direct-current power supply through a path via a power supply switch (3) and outputs an intermediate voltage; and a second linear regulator (13) which receives the intermediate voltage and outputs a second voltage. The power supply device outputs the higher of the first voltage or the second voltage. The first linear regulator has a smaller current consumption and a higher minimum operating voltage than the second linear regulator. When the voltage input from the direct-current power supply is lower than or equal to a predetermined threshold value, the switching regulator drives a main switching component (T1) interposed in series with the input/output path of the voltage to stay on. The second linear regulator executes the second voltage output operation during a full-on period during which the main switching component is driven to stay on.
Inventors:
SATAKE HIROYUKI (JP)
UEMURA SHINYA (JP)
MIKAMI YUKI (JP)
UEMURA SHINYA (JP)
MIKAMI YUKI (JP)
Application Number:
PCT/JP2017/006144
Publication Date:
November 16, 2017
Filing Date:
February 20, 2017
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
H02M3/155; G05F1/56
Foreign References:
| JP2009177909A | 2009-08-06 | |||
| JP2015159642A | 2015-09-03 | |||
| US20130169246A1 | 2013-07-04 |
Attorney, Agent or Firm:
SATO INTERNATIONAL PATENT FIRM (JP)
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