公开(公告)号：US07096134B2

公开(公告)日：2006-08-22

申请号：US10188257

申请日：2002-07-01

Applicant: Wayne A. Miller, Jr.

Inventor： Wayne A. Miller, Jr.

IPC: G01R25/00

CPC classification number: H02P6/06 ,  H02P6/17

Abstract: A system may include a PWM (Pulse Width Modulator) configured to generate a PWM signal, a signal modifier configured to generate a modified PWM signal that includes a sampling activation signal having a different frequency than the PWM signal, fan drive circuitry configured to provide power to a fan in response to the modified PWM signal; and a sampling unit configured to sample a fan tachometer signal in response to an indication that the fan is currently powered.

Abstract translation: 系统可以包括被配置为产生PWM信号的PWM（脉宽调制器），被配置为产生修改的PWM信号的信号修改器，该修改的PWM信号包括具有与PWM信号不同的频率的采样激活信号，风扇驱动电路被配置为提供功率 响应于修改的PWM信号到风扇; 以及采样单元，其被配置为响应于风扇当前被供电的指示来采样风扇转速计信号。