Title:
POWER SUPPLY DEVICE
Document Type and Number:
Japanese Patent JP2020137352
Kind Code:
A
Abstract:
To provide a power supply device capable of blocking a semiconductor switch in the case where an application voltage to the semiconductor switch is reduced, and an operation of a protection feature becomes an unstable state.SOLUTION: A power supply device 100 supplying a power of a power supply 1 to a load circuit 2, comprises: switching devices 11 and 12 containing semiconductor switches 11a and 12a connected to a power supply line supplying a power from the power supply 1 to the load circuit 2; a controller 30 that controls a driven voltage of the semiconductor switches 11a and 12a to switch ON/OFF of the semiconductor switches 11a and 12a; and a detection part that detects an output voltage of the switching devices 11 and 12 output from a low potential side of the semiconductor switches 11a and 12a. A lower limitation voltage that secures a turn off operation of the semiconductor switches 11a and 12a is set to a voltage on a high potential side of the semiconductor switches 11a and 12a. A prescribed threshold voltage is set to a voltage higher than the lower limit voltage. When a detection voltage detected by the detection part is lower than a prescribed threshold value, the semiconductor switches 11a and 12a become an off state.SELECTED DRAWING: Figure 1
Inventors:
RAI SHUN
Application Number:
JP2019031586A
Publication Date:
August 31, 2020
Filing Date:
February 25, 2019
Export Citation:
Assignee:
FUJIKURA LTD
International Classes:
H02H3/24; H02H5/04; H03K17/00; H03K17/08; H03K17/687
Attorney, Agent or Firm:
Eternal patent business corporation
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