POWER SUPPLY CIRCUIT FOR ELECTROSTATIC CAPACITY SENSOR CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a power supply circuit for an electrostatic capacity sensor circuit, having high reliability by increasing the human body capacitance to the ground and stabilizing the operation. SOLUTION: In this power supply circuit 20 for the electrostatic capacity sensor circuit 10, a high frequency by-pass capacitor C4 is connected between the primary winding ground terminal of a transformer 12 connected at its primary winding to an AC commercial power supply 11 and a zero-connecting point d of a rectifier 13 connected to the secondary winding of the transformer 12.