Driving circuit for capacitive load

Details Driving circuit for capacitive load Driving circuit for capacitive load

1999-02-11

2000-03-28

Paladini, Albert W.

Electrical transmission or interconnection systems

Capacitor

327111, 345211, H03K 1700

Patent

active

060435704

ABSTRACT:
A driving circuit for a capacitive load includes an amplifier for applying voltage with large amplitude to the capacitive load in order to reduce the power consumption of the amplifier is disclosed. The driving circuit for the capacitive load applies the voltages Vout, Vout' amplified by a first amplifier and a second amplifier Q.sub.2, Q.sub.3, Q.sub.2 ', Q.sub.3 ' to a first capacitive load C, and a second capacitive load C'. The applied voltages Vout and Vout' have the opposite phase to each other. The driving circuit for the capacitive load includes a first emitter follower circuit Q.sub.1 and a second emitter follower circuit Q.sub.1 ' for converting the supplied voltage Vcc from the power supply source of the driving circuit to the voltage which is higher by predetermined voltages E.sub.1, E.sub.1 ' than the output voltage Vout, Vout' of the first amplifier and the second amplifier respectively. The driving circuit for the capacitive load includes a switching part using diodes D.sub.1 and D.sub.2 (D.sub.1 ' and D.sub.2 ') for switching automatically to connect the power supply terminal of the first amplifier (second amplifier) with either the output of the emitter follower circuit Q.sub.1 (Q.sub.1 ') or the second capacitive load C (the first capacitive load C').

REFERENCES:
patent: 3656004 (1972-04-01), Kemerer et al.
patent: 4767959 (1988-08-01), Sakakibara et al.
patent: 5006739 (1991-04-01), Kimura et al.
patent: 5731722 (1998-03-01), Sugiki et al.
patent: 5852426 (1998-12-01), Erhart et al.

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