VOLTAGE-CURRENT CONVERSION CIRCUIT AND SENSOR UNIT

摘要

PROBLEM TO BE SOLVED: To improve the measurement accuracy of a sensor.

SOLUTION: A voltage-current conversion circuit includes: a switch S1 for supplying or interrupting a DC supply current; an inductor L1 connected at one end to the switch S1; and a control circuit 12 for controlling the switching of the switch S1 such that a current depending on an input voltage Vin corresponding to a value measured by the sensor whose measured value may fluctuate with changing ambient temperature is output through charging/discharging of the inductor L1. The ambient temperature change includes a temperature change due to heat emission of the voltage-current conversion circuit itself.

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