Invention Grant
- Patent Title: Fan control circuit
- Patent Title (中): 风扇控制电路
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Application No.: US14309237Application Date: 2014-06-19
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Publication No.: US09593689B2Publication Date: 2017-03-14
- Inventor: Cheng-Xian Lv
- Applicant: Alpha Networks Inc.
- Applicant Address: TW
- Assignee: ALPHA NETWORKS INC.
- Current Assignee: ALPHA NETWORKS INC.
- Current Assignee Address: TW
- Agency: Bacon & Thomas, PLLC
- Priority: CN201420062700U 20140212
- Main IPC: H02P6/18
- IPC: H02P6/18 ; G01N21/00 ; G08B3/00 ; F04D27/00 ; H02P7/29 ; F04D25/06

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.
Public/Granted literature
- US20150229253A1 FAN CONTROL CIRCUIT Public/Granted day:2015-08-13
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