Sumitomo Electric Industries, Limited

Sumitomo Wiring Systems, Limited

Autonetworks Technologies, Limited

Masaya Ina

Kota Oda

Masayuki Kato

Ryohei Sawada

Ryosuke Masuda

Koki Sakakibara

Yuta Taninaka

A power supply control device controls power supply through a wire. A first current output circuit is configured to output, to a temperature difference circuit, a current that is larger the larger a wire current, which flows through the wire is. The temperature difference circuit is configured to output a voltage that is higher the larger a temperature difference between a wire temperature of the wire and an ambient temperature in the surroundings of the wire is. A drive circuit is configured to interrupt a flow of the wire current if the output voltage of the temperature difference circuit is at least a voltage threshold.

Power supply control device

An in-vehicle device of the present invention includes a fuse and an upstream capacitor having one end connected to a connection node upstream of the fuse in a current path of current that flows through the fuse. One end of a downstream capacitor is connected to a connection node downstream of the fuse in the current path. A determiner determines whether or not the fuse is blown based on an upstream voltage that passed through the upstream capacitor and a downstream voltage that passed through the downstream capacitor.

In-vehicle device

In a second detection circuit, a current output device outputs, to a circuit resistor, a current corresponding to a circuit voltage between an input terminal of a second FET to which a current is input and ground of a second drive circuit that switches the second FET ON or OFF. The second detection circuit outputs a voltage between two ends of the circuit resistor. A voltage between the ground of the second drive circuit and a downstream end of the circuit resistor is higher than 0 V.

Detection circuit and power supply control device

In a switch device, an output voltage output by a microcomputer is input to one end of a resistor. A driving circuit switches a main switch on or off according to a resistor voltage at the other end of the resistor. When all of a plurality of specific voltages included in a plurality of output voltages output by the microcomputer are an output threshold or more, an AND circuit of an adjustment circuit reduces the resistor voltage.

Switch device

A power supply control device controls power supply by switching on or off a first semiconductor switch and a second semiconductor switch that are arranged on a current path. A first diode and a second diode are connected between a drain and a source of the first semiconductor switch and the second semiconductor switch, respectively. Cathodes of the first diode and the second diode are arranged downstream and upstream of the respective anode on the current path. If current flows through the current path even though a microcomputer has given an instruction to switch the first semiconductor switch and the second semiconductor switch off, a first drive circuit switches the first semiconductor switch on.

Growing community of inventors

Yokkaichi, Japan

Masaya Ina