TW200631291A - A start-up apparatus for a power supply - Google Patents

A start-up apparatus for a power supply

Info

Publication number
TW200631291A
TW200631291A TW094105118A TW94105118A TW200631291A TW 200631291 A TW200631291 A TW 200631291A TW 094105118 A TW094105118 A TW 094105118A TW 94105118 A TW94105118 A TW 94105118A TW 200631291 A TW200631291 A TW 200631291A
Authority
TW
Taiwan
Prior art keywords
start
up
holding capacitor
transistor
power supply
Prior art date
Application number
TW094105118A
Other versions
TWI311396B (en
Inventor
Ta-Yung Yang
Wei-Hsuan Huang
Original Assignee
System General Corp
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 System General Corp filed Critical System General Corp
Priority to TW94105118A priority Critical patent/TWI311396B/en
Publication of TW200631291A publication Critical patent/TW200631291A/en
Application granted granted Critical
Publication of TWI311396B publication Critical patent/TWI311396B/en

Links

Abstract

A start-up apparatus for a power supply is presented. A charging path from an input voltage source to a holding capacitor is cut off after the power supply is started up. The start-up apparatus includes a transistor having a drain connected to the input voltage source; and a source connected to the holding capacitor and an input of a start-up control unit. An output of the start-up control unit controls a switch and the transistor. The holding capacitor starts to be charged as the transistor is turned on. Once a voltage across the holding capacitor exceeds a start-threshold voltage, the start-up control unit is activated to turn on the switch. Therefore, a control circuit is energized. Meanwhile, the transistor is turned off and the charging path of the holding capacitor is cut off. Further, the start-up apparatus provides a hysteresis reference range for starting-up or disabling operation of power supplies.
TW94105118A 2005-02-21 2005-02-21 A start-up apparatus for a power supply TWI311396B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW94105118A TWI311396B (en) 2005-02-21 2005-02-21 A start-up apparatus for a power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW94105118A TWI311396B (en) 2005-02-21 2005-02-21 A start-up apparatus for a power supply

Publications (2)

Publication Number Publication Date
TW200631291A true TW200631291A (en) 2006-09-01
TWI311396B TWI311396B (en) 2009-06-21

Family

ID=45072419

Family Applications (1)

Application Number Title Priority Date Filing Date
TW94105118A TWI311396B (en) 2005-02-21 2005-02-21 A start-up apparatus for a power supply

Country Status (1)

Country Link
TW (1) TWI311396B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI393333B (en) * 2009-09-22 2013-04-11 Richpower Microelectronics Controller chip and protection method for a power converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI393333B (en) * 2009-09-22 2013-04-11 Richpower Microelectronics Controller chip and protection method for a power converter

Also Published As

Publication number Publication date
TWI311396B (en) 2009-06-21

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