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    • 8. 发明申请
    • PIEZOELECTRIC DEVICES AND METHODS AND CIRCUITS FOR DRIVING SAME
    • 压电装置及其驱动方法和电路
    • WO2005098984A2
    • 2005-10-20
    • PCT/US2005011579
    • 2005-04-04
    • PAR TECHNOLOGIES LLCVOGELEY JAMESSCHEMMANN MARCEL F CJONES GARTH S
    • VOGELEY JAMESSCHEMMANN MARCEL F CJONES GARTH S
    • F04B43/04H01L41/04H01L41/09
    • F04B43/046H01L41/042
    • A drive circuit (18) produces a drive signal for a pump (10) having a piezoelectric actuator (14), with the piezoelectric actuator (14) forming a part of the drive circuit (18) and serving to shape a waveform of the drive signal. The drive circuit (18) comprises a pulse generator (100) which generates pulses; a converter circuit (102) which receives the pulses and produces charge packets at a rate which equals a desired drive frequency; and, the piezoelectric actuator (14). The piezoelectric actuator (14) receives the charge packets and, by its capacitive nature, integrates the charge packets to shape the waveform of the drive signal. Preferably, the piezoelectric actuator (14) integrates the charge packets to yield a drive field that approximates a sine wave. In one non-limiting example embodiment, the pulse generator (100) comprises a microcontroller-based pulsed width modulator (PWM) circuit (116) and the converter circuit (102) comprises a flyback circuit.
    • 驱动电路(18)产生用于具有压电致动器(14)的泵(10)的驱动信号,压电致动器(14)形成驱动电路(18)的一部分并且用于对驱动器的波形进行整形 信号。 驱动电路(18)包括产生脉冲的脉冲发生器(100) 转换器电路(102),其接收所述脉冲并以等于所需驱动频率的速率产生电荷分组; 和压电致动器(14)。 压电致动器(14)接收电荷分组,并通过其电容性质对电荷分组进行积分,以形成驱动信号的波形。 优选地,压电致动器(14)积分电荷分组以产生近似正弦波的驱动场。 在一个非限制性示例实施例中,脉冲发生器(100)包括基于微控制器的脉冲宽度调制器(PWM)电路(116),并且转换器电路(102)包括反激电路。