Control device for suppression of residual vibration of piezoelectric transducer
AssigneeTung Thih Electronic Co., Ltd.
InventorsChao-Ting Wu, Wen-Jong Wu
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Abstract
A control device for suppression of residual vibration of a piezoelectric transducer includes a capacitive energy storage component, and a switch unit. The control device is operable in a non-working mode, in which the switch unit provides voltage on the capacitive energy storage component to the piezoelectric transducer for reducing the residual vibration of the piezoelectric transducer. The capacitive energy storage component has a capacitance value that is sufficient for enabling the voltage on the capacitive energy storage component to substantially track voltage on the piezoelectric transducer under the non-working mode.
Claims12
A control device for suppression of residual vibration of a piezoelectric transducer, the piezoelectric transducer being applied in a system with an equivalent mass block, said control device comprising:
- a capacitive energy storage component;
- and
- a switch unit coupled electrically to said capacitive energy storage component, and for coupling electrically to the piezoelectric transducer;
- wherein when said control device is operating in a non-working mode, said switch unit provides voltage on said capacitive energy storage component to the piezoelectric transducer for reducing the residual vibration of the piezoelectric component;
- wherein said capacitive energy storage component has a capacitance value that is large enough to make the voltage on said capacitive energy storage component to substantially follow the voltage on the piezoelectric transducer while the control device operates under the non-working mode;
- wherein the voltage on said capacitive energy storage component under the non-working mode satisfies the following inequality:
- V
- D
-
-
- C
- ≤
- π
- 4
-
- n
-
- F
- M
- sin
-
- (
- π
-
-
- d
- )
- ,
- in which VDC represents the voltage on said capacitive energy storage component, n represents electro-mechanical ratio of the system, FM represents amplitude of an external force applied to the equivalent mass block at a resonant frequency, and d represents a duty cycle of said switch unit.
Dependencies are inferred from the claim text.