Capacity measuring method

Abstract

Abstract PURPOSE:To measure a capacity very easily by charging in advance one of a capacitor of unknown capacity to be measured and a reference capacitor of known capacity with a prescribed voltage. CONSTITUTION:A capacitor of unknown capacity to be measured 1, a reference capacitor 2 of known capacity, and a charge detector 5, etc. are provided. In this state, switches 253, 254 are closed and an integration use capacitor 252 is discharged. Next, switches 26, 29 and 253 are closed, the capacitor 1 is charged with a voltage Er and the capacitor 2 is discharged. Thereafter, the capacitor 1 is discharged by opening the switch 26 and closing a switch 27, and the capacitor 2 is charged with the voltage Er by opening the switch 29 and closing a switch 28. Also, when the discharged charge is stored in the capacitor 252 by closing a switch 255 and opening the switch 254, a discharge path becomes output terminals 225, 252 of 27 and 251, and a charge path becomes an output terminal of 28, 2, 252, 255 and 251. Accordingly, an output voltage V0 of a detector 5 can be derived, and the unknown capacity CX can be derived.

Inventors

• 👤 Kenzo Watanabe
• 👤 渡辺　健藏

Bibliographic Details