Jtekt Corporation

Shingo Suzuki

Fumihiko Sato

Masataka Okuda

Hiroaki Hanzawa

Toshiyuki Mikida

A power supply circuit includes a first P-channel MOSFET and a first voltage application circuit. The first P-channel MOSFET is provided between an on-board power supply and a vehicular apparatus that is a power supply target, and is configured to switch a power-ON state in which electric power is supplied to the vehicular apparatus and a power-OFF state in which the supply of the electric power is interrupted. The first voltage application circuit is configured to apply a voltage having a potential lower than a potential of the on-board power supply to a gate terminal such that a state of the first P-channel MOSFET is switched to the power-ON state, and apply a voltage having a potential equal to the potential of the on-board power supply to the gate terminal such that the state of the first P-channel MOSFET is switched to the power-OFF state.

Power supply circuit and power supply apparatus

An auxiliary power supply device includes a parasitic diode forming a parallel circuit together with a second switching element and connected in a forward direction to a main power supply, and a parasitic diode forming a parallel circuit together with a fourth switching element and connected in a reverse direction to an auxiliary power supply. When a state parameter indicates that a reaction force that interferes with operation of an assist motor is applied, an electronic control unit turns ON a first switching element, turns OFF the second switching element, turns ON a third switching element, and turns OFF the fourth switching element. A regenerative current from the assist motor flows to the auxiliary power supply via an inverter, the third switching element, and the parasitic diode.

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Nagoya, Japan

Shingo Suzuki