Drive circuit for a piezoelectric actuator

Details Drive circuit for a piezoelectric actuator Drive circuit for a piezoelectric actuator

1989-11-29

1992-03-10

Budd, Mark O.

Electricity: motive power systems

Nonmagnetic motor

310316, 346 78, H01L 4108

Patent

active

050952560

ABSTRACT:
A drive circuit for driving a piezoelectric (PZ) stack, in response to an excitation voltage, generates a dimensional strain varying along a sinusoidal waveform in a PZ stack by applying an excitation voltage intermittently to a series connection of the PZ stack and a winding via a first switching circuit, and then releases the charge of the PZ stack intermittently via a second switching circuit. A control circuit controls the first and second switching circuits by generating a first and second drive pulse stream so that the charge voltage of the PZ stack returns to its initial state in a period of the first and second drive pulse streams. The charge stored in the PZ stack is released fully and quickly before the application of the next pulse voltage without the use of a resistor, and the resonance current which flows through the PZ stack is constant, thereby allowing the PZ stack to be fully discharged without requiring an exclusive path.

REFERENCES:
patent: 4595854 (1986-06-01), Yano et al.
patent: 4714935 (1987-12-01), Yamamoto et al.
patent: 4732129 (1988-03-01), Takigawa et al.
patent: 4767959 (1988-08-01), Sakakibara et al.
patent: 4947074 (1990-08-01), Suzuki

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