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Title:
POWER SUPPLY CIRCUIT
Document Type and Number:
Japanese Patent JP2015171305
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a power supply circuit capable of detecting an OFF failure of a switching element for reverse connection protection, without addition of a new circuit.SOLUTION: A power supply circuit 100 includes: an FET 3 for opening and closing an electric circuit; an FET 4 for reverse connection protection; a voltage detection circuit 5 for detecting the voltage at one end of the FET 4; a precharge circuit 6 for charging an electrolytic capacitor 7; and a control part 1 for controlling the FET 3, the FET 4 and the precharge circuit 6. One end of the FET 3 is connected to the positive electrode of a battery B, whereas another end of the FET 3 is connected to one end of the FET 4. Another end of the FET 4 is connected to one end of a motor drive circuit 2 and the electrolytic capacitor 7. The control part 1 operates the precharge circuit 6 to charge the electrolytic capacitor 7, and after outputting an ON signal to the FET 4, judges the existence or non-existence of the OFF failure of the FET 4, on the basis of the voltage detected by the voltage detection circuit 5.

Inventors:
KIDO SATOSHI
FUKUOKA TAKAYUKI
KUROSHIMA HISAYOSHI
Application Number:
JP2014047089A
Publication Date:
September 28, 2015
Filing Date:
March 11, 2014
Export Citation:
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Assignee:
OMRON AUTOMOTIVE ELECTRONICS CO LTD
International Classes:
H02H11/00; H02H7/18; H02J7/00; H02P29/00
Domestic Patent References:
JP2012139021A2012-07-19
Attorney, Agent or Firm:
奥村 秀行



 
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