TW200631291A - A start-up apparatus for a power supply - Google Patents
A start-up apparatus for a power supplyInfo
- 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
- holding capacitor
- transistor
- power supply
- control unit
- turned
- Prior art date
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.
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)
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 |
-
2005
- 2005-02-21 TW TW94105118A patent/TWI311396B/en active
Cited By (1)
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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