Amplifier for driving large capacitive loads

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

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310317, H01L 4108

Patent

active

052647528

ABSTRACT:
An amplifier design for a capacitive load reduces power supply requirements by recovering, during the discharge of the capacitive load, a substantial amount of the stored energy without causing noise signals to be created. The recovered energy is stored in novel series-connected capacitors to be reused during the subsequent load charge cycle. The stack becomes an effective multiple power supply source. The capacitors are successively switched and thus sequentially harnessed to the load capacitor so that the voltage across the load capacitor is increased by selected step increments instead of by one large voltage jump which causes circuit noise. By using MOSFET devices for the switches, the voltage increase during charging and decrease during discharging is continuous, thus eliminating the step function which causes much of the deleterious noise. The amplifier is especially useful as a driver for an actuator in an active control system for quieting noise-causing vibrations in buildings and other structures, which can be a health hazard.

REFERENCES:
patent: 4404502 (1983-09-01), Magori et al.
patent: 4767959 (1988-08-01), Sakakibara et al.
patent: 4947074 (1990-08-01), Suzuki

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