Power supply capacitor capacitance measuring device and power supply capacitor capacitance measuring method

摘要

PROBLEM TO BE SOLVED: To provide a power supply capacitor capacitance measuring device and a method capable of suppressing a decrease in reliability and suppressing a capacitance measurement error of a power supply capacitor. A charging circuit is composed of a power supply capacitor 16, a DC power supply 500 for charging the power supply capacitor 16, and a charging switch 501 for turning on / off the connection between the DC power supply 500 and the power supply capacitor 16. The charging circuit is provided with current sensors 504 and 505 that detect the charging current of the power supply capacitor 16. Charging of the power supply capacitor 16 is started, and charging of the power supply capacitor 16 is started for the first time T1 required for the current sensor 504 to detect the first current value I1, and charging of the power supply capacitor 16 is started, and the current sensor 505 charges the second current value I2. The capacitance of the power supply capacitor 16 is measured from the time difference between the second time T2 required for detection and the first time T1 and the second time T2. [Selection diagram] Fig. 4