Current detection circuit and current detection method

Details Current detection circuit and current detection method Current detection circuit and current detection method

2006-05-09

2006-05-09

Budd, Mark (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S316010

Reexamination Certificate

active

07042135

ABSTRACT:
A current detection circuit which applies an AC voltage to a vibrator (1) which converts electricity into a mechanical energy to vibrate, and detects a mechanical branch current serving as a current component which contributes to the vibration of the vibrator (1), includes a series circuit which connects a capacitor (4) to the vibrator (1) in series, voltage dividing circuits (5, 6), connected to the series circuit in parallel, for dividing and extracting a voltage applied across the series circuit, and a detection circuit (7) for detecting a difference between, of the divided voltages, a terminal voltage other than the voltage applied across the series circuit and a voltage at a connection portion between the vibrator and the capacitor in the series circuit.

REFERENCES:
patent: RE35043 (1995-09-01), Takeda
patent: 5856728 (1999-01-01), Zimnicki et al.
patent: 6448689 (2002-09-01), Satoh
patent: 6788155 (2004-09-01), Chaudhuri et al.
patent: 62-002869 (1987-01-01), None
patent: 62-2869 (1987-08-01), None
patent: 01-136575 (1989-05-01), None

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