Patent ID: 11920990
Assignee: SUMITOMO WIRING SYSTEMS, LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An in-vehicle temperature detection circuit, comprising:
a temperature detecting unit including a plurality of individual detecting units, each having a resistor and a temperature detecting element connected in series with each other, the resistor and the temperature detecting element interposed between a first conductive path and a reference conductive path, the reference conductive path being a ground, a predetermined source voltage is applied to the first conductive path, wherein each of the plurality of individual detecting units are interposed between the predetermined source voltage and the ground and each of the plurality of individual detecting units are connected to each other in series along the first conductive path;
a plurality of first bipolar transistors, each of the first bipolar transistors including a first emitter, a first collector and a first base, each of the plurality of first bipolar transistors connected to a corresponding one of the plurality of individual detecting units; and
a second conductive path electrically connected to the first conductive path and to each of the first emitter of the plurality of first bipolar transistors,
wherein the first base of each of the plurality of first bipolar transistors is electrically connected to a third conductive path of the corresponding individual detecting unit, the third conductive path connecting the resistor to the temperature detecting element; and
a voltage reflecting a highest voltage or a lowest voltage among voltages applied to the third conductive paths in the plurality of individual detecting units is applied to the second conductive path.