公开(公告)号：US20050019168A1

公开(公告)日：2005-01-27

申请号：US10695776

申请日：2003-10-30

申请人： Wen-Shi Huang ,  Ming-Shi Tsai ,  Cheng-Chieh Liu ,  Tsung-Jung Hsieh ,  Yuch-Lung Huang

发明人： Wen-Shi Huang ,  Ming-Shi Tsai ,  Cheng-Chieh Liu ,  Tsung-Jung Hsieh ,  Yuch-Lung Huang

IPC分类号： H02P6/08 ,  F04D27/02 ,  H03K17/60 ,  F04B49/06

CPC分类号： F04D27/004

摘要： A fan motor speed control circuit is disclosed. The circuit includes a digital/analog converting unit and a driving unit. The digital/analog converting unit takes charge of receiving a pulse width modulation (PWM) signal and converting it into a voltage signal. The driving unit is connected with the digital/analog converting unit in series for receiving the voltage signal, while the driving unit provides a first predetermined voltage level and a second predetermined voltage level as references. The fan motor is kept to run with a low constant rotation speed when the voltage signal level is higher than the first predetermined voltage level, with a full constant rotation speed when the voltage signal level is lower than the second predetermined voltage level, and with a variable rotation speed when the voltage signal level is lower than the first predetermined voltage level and higher than the second predetermined voltage level.

摘要翻译： 公开了一种风扇马达速度控制电路。 电路包括数字/模拟转换单元和驱动单元。 数字/模拟转换单元负责接收脉宽调制（PWM）信号并将其转换为电压信号。 驱动单元与数字/模拟转换单元串联连接以接收电压信号，而驱动单元提供第一预定电压电平和第二预定电压电平作为参考。 当电压信号电平高于第一预定电压电平时，风扇电动机以低的恒定转速运行，当电压信号电平低于第二预定电压电平时具有完全恒定的转速，并且使用 当电压信号电平低于第一预定电压电平并高于第二预定电压电平时，可变转速。