Piezoelectric devices and methods and circuits for driving same
First Claim
1. A pump comprising:
- a pump body configured to at least partially define a pumping chamber;
a piezoelectric actuator situated in the pump body and responsive to a drive signal for drawing fluid into the pumping chamber and expelling fluid from the pumping chamber; and
a drive circuit configured to produce the drive signal so that the drive signal has a waveform of a predetermined waveform shape for optimizing at least one operational parameter of the pump, the drive circuit including a memory, the memory having stored therein waveform shape data which is utilized by the drive circuit in producing the drive signal according to the predetermined waveform shape, the waveform shape data having been prepared by solving a waveform equation, the waveform equation having coefficients determined to optimize at least one operational parameter of the pump.
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Accused Products
Abstract
A drive circuit (18) produces a drive signal having a waveform of a predetermined waveform shape for a device (10) having a piezoelectric actuator (14). The drive circuit (14) includes a memory (140) which stores waveform shape data which is utilized by the drive circuit in producing the drive signal. The drive circuit utilizes the waveform shape data so that, for each of plural points comprising a period of the waveform, the drive signal has an appropriate amplitude for the predetermined waveform shape. The waveform shape data has preferably been prepared to optimize one or more operational parameter(s) of the device. Preferably the waveform shape data has been prepared by solving a waveform equation, the waveform equation having coefficients determined to optimize at least one operational parameter of the device.
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Citations
10 Claims
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1. A pump comprising:
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a pump body configured to at least partially define a pumping chamber; a piezoelectric actuator situated in the pump body and responsive to a drive signal for drawing fluid into the pumping chamber and expelling fluid from the pumping chamber; and a drive circuit configured to produce the drive signal so that the drive signal has a waveform of a predetermined waveform shape for optimizing at least one operational parameter of the pump, the drive circuit including a memory, the memory having stored therein waveform shape data which is utilized by the drive circuit in producing the drive signal according to the predetermined waveform shape, the waveform shape data having been prepared by solving a waveform equation, the waveform equation having coefficients determined to optimize at least one operational parameter of the pump. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification