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    • 8. 发明申请
    • FAN ROTARY SPEED CONTROLLING DEVICE
    • 风扇转速控制装置
    • US20120112679A1
    • 2012-05-10
    • US13033894
    • 2011-02-24
    • Chung-Hung TANGChien-Sheng LinChin-Fa ChiuChun-Lung Chiu
    • Chung-Hung TANGChien-Sheng LinChin-Fa ChiuChun-Lung Chiu
    • H02P7/00
    • H02P6/06H02P6/14
    • A fan rotary speed controlling device includes a first signal generating circuit, a second signal generating circuit, a pulse width modulation (PWM) circuit and a switching circuit. The first signal generating circuit receives a real frequency signal and a target frequency signal, and generates a first signal according to the real frequency signal and the target frequency signal. The second signal generating circuit generates a second signal according to the first signal. The PWM circuit generates a PWM signal according to the second signal. The switching circuit is electrically connected with the PWM circuit and outputs a control signal to control the rotary speed of the motor. Hence, the fan rotary speed controlling device boosts the accuracy and the stability of the fan rotary speed.
    • 风扇转速控制装置包括第一信号发生电路,第二信号发生电路,脉宽调制(PWM)电路和开关电路。 第一信号发生电路接收实频信号和目标频率信号,并根据实频信号和目标频信号产生第一信号。 第二信号发生电路根据第一信号产生第二信号。 PWM电路根据第二信号产生PWM信号。 开关电路与PWM电路电连接并输出控制信号以控制电动机的转速。 因此,风扇转速控制装置提高了风扇转速的精度和稳定性。