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    • 13. 发明授权
    • Apparatus and method for measuring average motor current
    • 用于测量平均电机电流的装置和方法
    • US5710495A
    • 1998-01-20
    • US702416
    • 1996-08-14
    • Dale J. Skelton
    • Dale J. Skelton
    • G01R19/00H02P7/29H02K29/04
    • G01R19/0092H02P7/29
    • Apparatus and method (10, 40) for measuring an average motor current in a pulse width modulation driven motor are provided. A sensor (20) is coupled to the motor to measure a motor winding current. A first current source (26) generates a first current generally proportional to the motor winding current. A second current substantially proportional to a chopped output voltage is also produced and subtracted from the first current. A circuitry (28) receives the difference between the first and second currents and generates an output voltage indicative of the average motor current. The output voltage is chopped by a circuit (32, 34) that produces a waveform at substantially the same duty cycle and phase as the pulse width modulation waveform driving the motor.
    • 提供了用于测量脉宽调制驱动电动机中的平均电动机电流的装置和方法(10,40)。 传感器(20)耦合到电动机以测量电动机绕组电流。 第一电流源(26)产生通常与电机绕组电流成比例的第一电流。 与斩波输出电压基本成比例的第二电流也产生并从第一电流中减去。 电路(28)接收第一和第二电流之间的差值,并产生一个表示平均电动机电流的输出电压。 输出电压被电路(32,34)斩波,该电路产生与驱动电动机的脉冲宽度调制波形基本上相同的占空比和相位的波形。