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TW200630780A - Limited current circuit - Google Patents

Limited current circuit

Info

Publication number
TW200630780A
TW200630780A TW094104939A TW94104939A TW200630780A TW 200630780 A TW200630780 A TW 200630780A TW 094104939 A TW094104939 A TW 094104939A TW 94104939 A TW94104939 A TW 94104939A TW 200630780 A TW200630780 A TW 200630780A
Authority
TW
Taiwan
Prior art keywords
voltage
circuit
limited current
comparator
predetermined reference
Prior art date
Application number
TW094104939A
Other languages
Chinese (zh)
Other versions
TWI278737B (en
Inventor
Kuan-Chi Juan
Original Assignee
Acer Inc
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 Acer Inc filed Critical Acer Inc
Priority to TW94104939A priority Critical patent/TWI278737B/en
Publication of TW200630780A publication Critical patent/TW200630780A/en
Application granted granted Critical
Publication of TWI278737B publication Critical patent/TWI278737B/en

Links

Landscapes

  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Power Sources (AREA)

Abstract

A limited current circuit is disclosed. The limited current circuit is applied to a computer system having a USB device and a power adapter. The limited current circuit includes a voltage adjusting circuit, a switch circuit, a frequency adjusting circuit, a storage element and a comparator. The comparator is electrically coupled to the frequency adjusting circuit and the switch circuit and having a predetermined reference voltage for receiving a third voltage outputting from the frequency adjusting circuit and comparing with the predetermined reference voltage. The comparator will control the switch circuit turning on for transmitting a second voltage to the USE device via the switch circuit, when the third voltage is smaller than the predetermined reference voltage. The comparator will control the switch circuit turning off and the storage element will provide the operating voltage of the USB device, when the third voltage is greater than the predetermined reference voltage.
TW94104939A 2005-02-18 2005-02-18 Limited current circuit and computer system using the same TWI278737B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW94104939A TWI278737B (en) 2005-02-18 2005-02-18 Limited current circuit and computer system using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW94104939A TWI278737B (en) 2005-02-18 2005-02-18 Limited current circuit and computer system using the same

Publications (2)

Publication Number Publication Date
TW200630780A true TW200630780A (en) 2006-09-01
TWI278737B TWI278737B (en) 2007-04-11

Family

ID=38645224

Family Applications (1)

Application Number Title Priority Date Filing Date
TW94104939A TWI278737B (en) 2005-02-18 2005-02-18 Limited current circuit and computer system using the same

Country Status (1)

Country Link
TW (1) TWI278737B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104345855A (en) * 2013-08-05 2015-02-11 鸿富锦精密工业（深圳）有限公司 Current limiting circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI402668B (en) * 2009-07-30 2013-07-21 Hon Hai Prec Ind Co Ltd An electronic device and method for assigning power to usb ports dynamically
TWI392990B (en) * 2009-12-17 2013-04-11 Acer Inc Voltage regulating circuit, voltage regulating method, and computer system having the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104345855A (en) * 2013-08-05 2015-02-11 鸿富锦精密工业（深圳）有限公司 Current limiting circuit
CN104345855B (en) * 2013-08-05 2017-11-24 山东比特智能科技股份有限公司 Current-limiting circuit for USB interface

Also Published As

Publication number Publication date
TWI278737B (en) 2007-04-11

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Legal Events

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