Power supply control device
AssigneesAutonetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
InventorsKota Oda, Masaya Ina, Shunichi Sawano, Masayuki Kato
Life of this patent
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Abstract
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.
Claims7
A power supply control device for controlling power supplied via a wire, comprising:
- a current output circuit configured to output a current that is larger the larger a wire current, which flows through the wire, is, wherein the current output circuit includes a sub switch in series with a transistor and a differential amplifier, wherein the current output by the current output circuit is output through the transistor and the differential amplifier provides an input to a gate of the transistor;
- a temperature difference circuit to which the current output by the current output circuit is input, and which 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, wherein the temperature difference circuit includes a capacitor, the capacitor is charged if heat is generated by the wire, and the capacitor discharges if heat is dissipated by the wire, and the output voltage of the temperature difference circuit is higher the higher a voltage across the capacitor is;
- and
- an interruption unit configured to interrupt a flow of the wire current if the output voltage of the temperature difference circuit is at least a voltage threshold.
A power supply control device for controlling power supplied via a wire, comprising:
- a current output circuit configured to output a current that is larger the larger a wire current, which flows through the wire, is, wherein the current output circuit includes a sub switch in series with a transistor and a differential amplifier, wherein the current output by the current output circuit is output through the transistor and the differential amplifier provides an input to a gate of the transistor;
- a temperature difference circuit to which the current output by the current output circuit is input, and which 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;
- an interruption unit configured to interrupt a flow of the wire current if the output voltage of the temperature difference circuit is at least a voltage threshold;
- and
- a processing unit for executing processing, wherein the processing unit is configured to:
- acquire an output voltage of the temperature difference circuit while the wire current flows, and
- determine whether or not the acquired output voltage is not greater than a second voltage threshold,
- wherein
- the second voltage threshold is smaller than the voltage threshold.
Dependencies are inferred from the claim text.