Title:
ELECTRONIC CIRCUIT DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/002527
Kind Code:
A1
Abstract:
Although an internal electronic circuit device connected to a connector terminal is protectable when a power supply fault occurs, a load connected to the connector terminal is not protectable. According to the present invention, when the voltage at the cathode side of a diode 107 becomes equal to or higher than the output voltage by a power supply circuit 108 due to the power supply fault of a positive-electrode-side terminal 100, the output voltage by an operation amplifier 105 changes from the output voltage (5 V) by the power supply circuit 108 to a voltage (0 V) connected to the negative power supply of the operation amplifier 105. When the output voltage by the operation amplifier 105 becomes 0 V, since the voltage difference between the gate and the source of a switching element 109 becomes equal to or lower than a prescribed voltage, the drain and the source of the switching element 109 becomes an open state, and thus the current flowing to a negative-electrode-side terminal 101 is cut off. Hence, a load 103 is protectable from an excess current.
Inventors:
TODA ISSEI (JP)
SHIGETA SATORU (JP)
SHIGETA SATORU (JP)
Application Number:
PCT/JP2016/066524
Publication Date:
January 05, 2017
Filing Date:
June 03, 2016
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
H02H7/20; H02H3/20
Foreign References:
| JPS4723846A | ||||
| US20100284114A1 | 2010-11-11 | |||
| JP2014171346A | 2014-09-18 | |||
| JP2008092277A | 2008-04-17 | |||
| JP2002271183A | 2002-09-20 | |||
| JPS4726649A |
Attorney, Agent or Firm:
INOUE Manabu et al. (JP)
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