STATIC CAPACITANCE MEASUREMENT DEVICE FOR POWER SOURCE CAPACITOR AND STATIC CAPACITANCE MEASUREMENT METHOD FOR POWER SOURCE CAPACITOR

• Main Authors: SATO TAKASHI, SHISHIDO MASANORI, SATO SHINDAI, KOBAYASHI MASATO
• Format: Patent
• Language: English; Japanese
• Published: 08.04.2021
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

To provide a static capacitance measurement device for a power source capacitor and method which can be suppressed in a decrease in reliability and allow for suppression of error of measurement of static capacitance for a power supply capacitor.SOLUTION: A static capacitance measurement device for a power source capacitor comprises a charge circuit which is constituted of a power source capacitor 16, a direct-current power source 500 charging the power source capacitor 16, and a charge switch 501 switching a connection between the direct-current power source 500 and the power source capacitor 16. The Current sensors 504, 505 detecting the charge current of the power source capacitor 16 are provided in the charge circuit. The static capacitance measurement device further comprises a storage and comparison unit which measures static capacitance of the power source capacitor 16 by using a first time T1 required until a first current value I1 is detected by the current sensor 504 after charging of the power source capacitor 16 is begun, a second time T2 required until a second current value I2 is detected by the current sensor 505 after charging of the power source capacitor 16 is begun, and a time difference between the first time T1 and the second time T2.SELECTED DRAWING: Figure 4 【課題】信頼性の低下を抑制し、電源コンデンサの静電容量測定誤差を抑制することができる電源コンデンサ静電容量測定装置及び方法を提供する。【解決手段】電源コンデンサ１６と、電源コンデンサ１６を充電する直流電源５００と、直流電源５００と電源コンデンサ１６との接続をオンオフする充電スイッチ５０１とにより充電回路が構成される。充電回路には電源コンデンサ１６の充電電流を検出する電流センサ５０４，５０５が備えられる。電源コンデンサ１６に充電が開始され、電流センサ５０４が第１電流値Ｉ１を検出するまでに要した第１時間Ｔ１と、電源コンデンサ１６に充電が開始され、電流センサ５０５が第２電流値Ｉ２を検出するまでに要した第２時間Ｔ２と、第１時間Ｔ１と第２時間Ｔ２との時間差から電源コンデンサ１６の静電容量を測定する。【選択図】 図４