| 摘要 |
A current control circuit for controlling the current supplied by an AC power source through an AC motor for providing a control of the speed of the motor, including, a semiconductor device having an input terminal, an output terminal and a control terminal and with the current passing from the input terminal to the output terminal forming a substantial portion of the current through the AC motor, and with a control signal provided at the control terminal and with an impedance provided in the output path of the semiconductor device and with the ratio between the amplitude of the control signal and the value of the impedance forming a substantial control of the value of the current passing from the input terminal to the output terminal, and with the ratio between the amplitude of the control signal and the value of the impedance controlled to predetermined values for controlling the current passing from the input terminal to the output terminal for controlling the speed of the motor.
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