TW200612654A - A direct current fan start up circuit - Google Patents

A direct current fan start up circuit

Info

Publication number
TW200612654A
TW200612654A TW093131355A TW93131355A TW200612654A TW 200612654 A TW200612654 A TW 200612654A TW 093131355 A TW093131355 A TW 093131355A TW 93131355 A TW93131355 A TW 93131355A TW 200612654 A TW200612654 A TW 200612654A
Authority
TW
Taiwan
Prior art keywords
direct current
switching device
circuit
fan start
current fan
Prior art date
Application number
TW093131355A
Other languages
Chinese (zh)
Other versions
TWI321396B (en
Inventor
Xing-Jun Yang
Feng-Long Ho
Yong-Xing You
Original Assignee
Hon Hai Prec Ind Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hon Hai Prec Ind Co Ltd filed Critical Hon Hai Prec Ind Co Ltd
Priority to TW93131355A priority Critical patent/TWI321396B/en
Publication of TW200612654A publication Critical patent/TW200612654A/en
Application granted granted Critical
Publication of TWI321396B publication Critical patent/TWI321396B/en

Links

Landscapes

  • Control Of Direct Current Motors (AREA)
  • Amplifiers (AREA)

Abstract

A direct current (DC) fan start up circuit includes a digital/analog converter (DAC) device for converting a digital signal from a controlling chip into an analog signal, a voltage-dividing device, an operational amplifier (OA), a switching device for controlling start up of the DC fan, and a feedback device for automatically adjusting the current flowing through the switching device. Wherein the output signal of the DAC device is inputted into one input port of the OA via the voltage-dividing device. The switching device is connected to the output port of the OA, and the output signal of the switching device is inputted into another input port of the OA through the feedback device.
TW93131355A 2004-10-15 2004-10-15 A direct current fan start up circuit TWI321396B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW93131355A TWI321396B (en) 2004-10-15 2004-10-15 A direct current fan start up circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW93131355A TWI321396B (en) 2004-10-15 2004-10-15 A direct current fan start up circuit

Publications (2)

Publication Number Publication Date
TW200612654A true TW200612654A (en) 2006-04-16
TWI321396B TWI321396B (en) 2010-03-01

Family

ID=45073837

Family Applications (1)

Application Number Title Priority Date Filing Date
TW93131355A TWI321396B (en) 2004-10-15 2004-10-15 A direct current fan start up circuit

Country Status (1)

Country Link
TW (1) TWI321396B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI410043B (en) * 2007-12-31 2013-09-21 Hon Hai Prec Ind Co Ltd Control circuit for computer fan

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI410043B (en) * 2007-12-31 2013-09-21 Hon Hai Prec Ind Co Ltd Control circuit for computer fan

Also Published As

Publication number Publication date
TWI321396B (en) 2010-03-01

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Legal Events

Date Code Title Description
MM4A Annulment or lapse of patent due to non-payment of fees