Sumitomo Wiring Systems, Limited

Toyota Jidosha Kabushiki Kaisha

Hiroshi Kimoto

Takumi Matsumoto

Nobutoshi Hagiwara

Shinji Oshita

Kenichi Takayoshi

Hiroki Onoyama

Shinji Aoyama

Takahiro Nagahama

Shohei Okuyama

In a first series circuit of a power supply control device, a first switch and a first resistor are connected in series. In a second series circuit, a second switch and a second resistor are connected in series. The second series circuit is connected in parallel to the first series circuit. An electric current detection circuit detects an electric current value of an electric current flowing through the first resistor. In a case where specific data is stored in a storage unit, a control unit (open failure detection unit) detects an open failure of the first switch or the second switch on the basis of the electric current value detected by the electric current detection circuit. In a case where the storage unit does not store the specific data, the control unit does not detect the open failure.

Power supply control device, open failure detection method and computer program

A power supply control device controls power supply through two branch paths branched from a common power supply path. Two N-channel FETs are respectively disposed in the two branch paths. A booster circuit outputs a voltage from a common output end, and applies a voltage to gates of the two FETs through a circuit resistor. Two charge resistors are respectively disposed in two applying paths through which a voltage is applied from the output end of the booster circuit to the gates of the two FETs. Each of two diodes are respectively connected between both ends of each of the two charge resistors. Cathodes of the two diodes are disposed on the side of the booster circuit.

Power supply control device having a pair of transistors

A relay circuit includes a relay and a current divider. The relay includes a coil and a contact. The contact is configured to switches on and off a supply of power to a load that is configured to operate with power supplied from a direct-current power supply through conduction of the coil. The current divider is connected between the contact and the load and configured to split a current supplied from the power supply to the load. The current divider incudes a resistor and a capacitor connected in series and grounded.

Relay circuit and electric junction box

A relay driver circuit is connected between an upper stage relay and a lower stage relay and is configured to be driven in response to driving of the upper relay. The relay driver circuit drives the lower stage relay. The relay driver circuit includes a semiconductor component, a control input line, a protective component, and a buffer circuit. The semiconductor component switches on and off the lower relay. The control input line is electrically connected to a control terminal of the semiconductor component. A power supply voltage is applied to the control input line via the upper stage relay. The protective component is connected in the control input line to protect the semiconductor component. The buffer circuit is connected between the protective component in the control input line and the control terminal of the semiconductor component to compensate for a voltage drop due to the protective component.

Relay driver circuit

A power supply control device includes a control unit that executes determination processing that, when an operation instruction is received from a switch input detection unit, determines, in a case in which the switch circuit is turned on, whether or not a power source voltage value will decrease to or below an acceptable voltage value on the basis of a power source voltage value obtained from a voltage detection unit and a load current value stored in a storage unit in advance; and in the determination processing, executes switch control processing which allows the switch circuit to be turned on if the power source voltage value is determined to not decrease to or below the acceptable voltage value and does not allow the switch circuit to be turned on if the power source voltage value is determined to decrease to or below the acceptable voltage value.

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Yokkaichi, Japan

Hiroshi Kimoto