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    • 9. 发明申请
    • MOTOR DRIVE DEVICE AND COOLING DEVICE USING THE SAME
    • 电机驱动装置和使用该装置的冷却装置
    • US20090096402A1
    • 2009-04-16
    • US12064389
    • 2006-08-23
    • Satoshi MiyajimaHiroaki HayashiTomofumi Mishima
    • Satoshi MiyajimaHiroaki HayashiTomofumi Mishima
    • G05D23/00
    • H02P6/16H02P6/26H03K2017/0806
    • A drive circuit of a fan motor is provided. In an embodiment of the drive circuit, a first PWM comparator compares a temperature detection voltage with a cyclic voltage, and outputs a first PWM signal. A second PWM comparator compares a minimum frequency setting voltage indicating a minimum frequency of the fan motor, with the cyclic voltage, and outputs a second PWM signal. The drive circuit combines the first PWM signal and the second PWM signal by a logical operation, to drive the fan motor. The drive circuit includes a first logic gate which generates a logical sum of the first PWM signal and the second PWM signal, and a second logic gate which generates a logical product of the first PWM signal and an inverted signal of the second PWM signal. The drive circuit switches drive mode based on the first logic gate and the second logic gate.
    • 提供了一种风扇马达的驱动电路。 在驱动电路的实施例中,第一PWM比较器将温度检测电压与循环电压进行比较,并输出第一PWM信号。 第二PWM比较器将表示风扇电动机的最小频率的最小频率设定电压与循环电压进行比较,并输出第二PWM信号。 驱动电路通过逻辑运算来组合第一PWM信号和第二PWM信号,以驱动风扇电动机。 驱动电路包括产生第一PWM信号和第二PWM信号的逻辑和的第一逻辑门和产生第一PWM信号与第二PWM信号的反相信号的逻辑积的第二逻辑门。 驱动电路基于第一逻辑门和第二逻辑门来切换驱动模式。