| 摘要 |
本案系关于一种马达转速控制装置，包括：参考电压生成模块，生成一参考电压；PWM信号转换模块，将PWM信号转换成与PWM信号占空比相对应之电压信号；第一比较器，电压信号的电压小等于参考电压时输出第一电平，电压信号的电压大于参考电压时输出第二电平；第一开关元件，控制端与第一比较器的输出端连接，第一端输入第一信号，在接收到第二电平时导通并在接收到第一电平时截止；跟随器，输入端与PWM信号转换模块连接；及控制信号输出端子，将通过第一开关元件接收到的第一信号或通过跟随器接收到的PWM信号转换成的电压信号输出至马达控制电路。;The disclosure relates to a rotational speed control device of a motor.The rotational speed control device includes a reference voltage generating module for generating a reference voltage, a PWM signal converting module for converting a PWM signal into a voltage signal corresponding to the duty ratio of the PWM signal, a first comparator for outputting a first level if the voltage of the voltage signal is less than the voltage of the reference voltage and outputting a second level if the voltage of the voltage signal is greater than the voltage of the reference voltage, a first switch having a control terminal connected with a output terminal of the first comparator, which is turned on for inputting a first signal when receiving the second level and turned off when receiving the first level, a follower having a input terminal connected with the PWM signal converting module, and a control signal output terminal for outputting the first signal received by the first switch or the voltage signal received by the follower and converted from the PWM signal to a motor control circuit. |
