Piezo actuator system and operating method thereof
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsDooseub SHIN, Donghoon LEE, Sanghyun JI, Chueljin PARK
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Abstract
A piezo actuator system includes a piezo actuator; and a driving circuit configured to apply a pulse width modulation (PWM) voltage waveform to the piezo actuator. An envelope of the PWM voltage waveform includes a first period in which a first voltage rising with a first slope is applied, a second period in which a second voltage rising with a second slope is applied, and a third period in which a third voltage rising with a third slope is applied. The third slope is greater than the second slope.
Claims13
A piezo actuator system comprising:
- a piezo actuator;
- and
- a driving circuit configured to apply a pulse width modulation (PWM) voltage waveform to the piezo actuator,
- wherein an envelope of the PWM voltage waveform comprises a first period in which a first voltage rising with a first slope is applied, a second period in which a second voltage rising with a second slope is applied, and a third period in which a third voltage rising with a third slope is applied, and the third slope is greater than the second slope.
An operating method of a piezo actuator system, the piezo actuator system comprising a piezo actuator and a driving circuit configured to apply a pulse width modulation (PWM) voltage waveform to the piezo actuator, the operating method comprising:
- in a first period, applying a first pulse having a first voltage to the piezo actuator;
- in second period, applying a plurality of second pulses having second voltages greater than the first voltage to the piezo actuator, wherein the second voltages gradually increase over time from the first voltage;
- and
- in third period, applying a third pulse having a third voltage greater than the second voltages to the piezo actuator,
- wherein an envelope of the PWM voltage waveform has a first slope in the first period, a second slope in the second period, and a third slope greater than the second slope in the third period.
Dependencies are inferred from the claim text.