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    • 55. 发明申请
    • SYSTEMS AND METHODS FOR ULTRASONIC POWER MEASUREMENT AND CONTROL OF PHACOEMULSIFICATION SYSTEMS
    • 用于超声功率测量和光调节系统控制的系统和方法
    • WO2013033299A3
    • 2013-10-10
    • PCT/US2012052992
    • 2012-08-30
    • ABBOTT MEDICAL OPTICS INCJACOBSON JON D
    • JACOBSON JON D
    • B06B1/02
    • B06B1/0253A61F9/00745B06B2201/76
    • In one embodiment, a method for determining the voltage current phase relationship of a piezoelectric phacoemulsification handpiece generally includes the steps of obtaining an analog AC voltage signal corresponding to the operating AC voltage of a piezoelectric handpiece along with an analog AC current signal corresponding to the operating AC current of the piezoelectric handpiece. Using reference detection circuits, a digital voltage signal and a digital current signal is produced. A synchronous sample clock is taken that has a frequency that is 2N times faster than the frequency of the operating ultrasonic handpiece (i.e., driving frequency), where N is the number of digital bits allocated to the sample clock.. This clock measures the time between onsets of a voltage and current cycle. This time value equates to the phase time delta between the two signals. Dividing the synchronous sample clock to obtain the driving frequency ensures the signals are synchronous. Further dividing the end count value into 360° results in the phase shift between the two signals in degrees that is independent of the operating frequency.
    • 在一个实施例中,用于确定压电超声乳化手持机的电压电流相位关系的方法通常包括以下步骤:获得与压电手持件的操作AC电压对应的模拟AC电压信号以及与操作对应的模拟AC电流信号 AC电流的压电手机。 使用参考检测电路产生数字电压信号和数字电流信号。 采用一个同步采样时钟,其频率比工作超声波手持件的频率(即驱动频率)快2N倍,其中N是分配给采样时钟的数字位数。该时钟测量时间 在电压和电流周期的起始点之间。 这个时间值等于两个信号之间的相位时间增量。 划分同步采样时钟以获得驱动频率确保了信号同步。 进一步将结束计数值除以360°会导致两个信号之间的相位偏移,这与度数无关,与工作频率无关。