Title:
POWER SUPPLY CIRCUIT AND ON-VEHICLE POWER SUPPLY SYSTEM
Document Type and Number:
Japanese Patent JP2016226079
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a power supply circuit and the like, capable of suppressing overshoot voltage of a load circuit even when input voltage has abruptly risen after the input voltage has reduced.SOLUTION: A switching power supply 100 receives a first voltage V1 as input, and outputs a second voltage V2 obtained by stepping down the first voltage V1. A linear power supply 200 includes a transistor T2 that receives the second voltage V2 as input and outputs a third voltage V3 obtained by smoothing the second voltage V2. A full-on determination circuit 300 determines whether or not the transistor T2 is in a full-on state. An output voltage changeover circuit 400, when it has been determined that the transistor T2 is not in the full-on state, makes output voltage setting of the switching power supply 100 be a first setting value; and, when it has been determined that the transistor T2 is in the full-on state, makes the output voltage setting of the switching power supply 100 be a second setting value lower than the first setting value.SELECTED DRAWING: Figure 4
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Inventors:
KOMORIYAMA KEIJI
SONEHARA MICHIHITO
KOBAYASHI YOICHIRO
SONEHARA MICHIHITO
KOBAYASHI YOICHIRO
Application Number:
JP2015107209A
Publication Date:
December 28, 2016
Filing Date:
May 27, 2015
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD
International Classes:
H02M3/155; G05F1/56
Domestic Patent References:
| JP2002335668A | 2002-11-22 | |||
| JPH03238946A | 1991-10-24 | |||
| JP2012080207A | 2012-04-19 | |||
| JP2002320380A | 2002-10-31 | |||
| JP2007166688A | 2007-06-28 | |||
| JP2015056934A | 2015-03-23 |
Attorney, Agent or Firm:
Kaichi International Patent Office
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