公开(公告)号：US20150229253A1

公开(公告)日：2015-08-13

申请号：US14309237

申请日：2014-06-19

Applicant: Alpha Networks Inc.

Inventor： Cheng-Xian LV

IPC: H02P7/00 ,  F04D25/06 ,  F04D27/00 ,  F04D19/00

CPC classification number: F04D27/004 ,  F04D25/0613 ,  H02P7/29

Abstract: The present invention is to provide a fan control circuit, which includes a filter circuit for converting a pulse-width modulation (PWM) voltage signal into a DC voltage signal; an amplifier circuit having an input end for receiving the DC voltage signal and a static voltage signal and generating an amplified voltage signal at an output end thereof; a current expansion circuit configured to perform current expansion on the amplified voltage signal and thereby generate a driving voltage signal for a fan; and a feedback circuit connected between another input end of the amplifier circuit and an output end of the current expansion circuit so that magnitude of the driving voltage signal is in direct proportion to the duty cycle of the PWM voltage signal and is greater than or equal to a lowest driving voltage value of the fan when the duty cycle of the PWM voltage signal approaches zero.

Abstract translation: 本发明提供一种风扇控制电路，其包括用于将脉冲宽度调制（PWM）电压信号转换成直流电压信号的滤波电路; 放大器电路，其具有用于接收直流电压信号的输入端和静态电压信号，并在其输出端产生放大的电压信号; 电流扩展电路，被配置为对放大的电压信号进行电流膨胀，从而生成用于风扇的驱动电压信号; 以及连接在放大器电路的另一输入端和电流扩展电路的输出端之间的反馈电路，使得驱动电压信号的大小与PWM电压信号的占空比成正比，并且大于或等于 当PWM电压信号的占空比接近零时风扇的最低驱动电压值。