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1. 发明授权

US06534947B2 Pump controller 有权
标题翻译：泵控制器
公开(公告)号：US06534947B2
公开(公告)日：2003-03-18
申请号：US09760276
申请日：2001-01-12
申请人： Steven A. Johnson , Kip M. Larson , Dee R. Walker
发明人： Steven A. Johnson , Kip M. Larson , Dee R. Walker
IPC分类号： H02H504
CPC分类号： H02P27/16 , H02H3/382 , H02H7/0833
摘要： A method and apparatus for controlling an electric motor pump. The method includes the acts of providing an AC power signal having a positive half cycle and a negative half cycle, measuring the voltage of the AC power signal and generating a first two-state output signal that is in a logic high state when the measured voltage is on the positive half cycle and that is in a logic low state when the measured voltage is on the negative half cycle, and measuring the current of the AC power signal and generating a second two-state output signal that is in logic high state when the measured current is on the positive half cycle and that is in a logic low state when the measured current is on the negative half cycle. The method also includes determining a time difference between the first and second two-state output signals, calculating a phase difference based on the time difference, comparing the phase difference to a predetermined threshold value, opening a switch if the determined phase difference is equal to or greater that the predetermined threshold value, and, after the switch is opened, closing the switch after a predetermined amount of time has elapsed.
摘要翻译：一种用于控制电动机泵的方法和装置。该方法包括提供具有正半周期和负半周期的AC功率信号的动作，测量AC功率信号的电压并产生处于逻辑高状态的第一两状态输出信号，当测量电压处于正半周期，当测量电压处于负半周期时，处于逻辑低状态，并测量交流电源信号的电流，并产生处于逻辑高状态的第二双态输出信号测量的电流为正半周期，当测量的电流为负半周期时，该电流处于逻辑低电平状态。该方法还包括确定第一和第二两状态输出信号之间的时间差，基于时间差计算相位差，将相位差与预定阈值进行比较，如果所确定的相位差等于以上，并且在开关断开之后，经过预定的时间后关闭开关。

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