TWI257037B - Switching-type constant current power supply device - Google Patents
Switching-type constant current power supply deviceInfo
- Publication number
- TWI257037B TWI257037B TW93119373A TW93119373A TWI257037B TW I257037 B TWI257037 B TW I257037B TW 93119373 A TW93119373 A TW 93119373A TW 93119373 A TW93119373 A TW 93119373A TW I257037 B TWI257037 B TW I257037B
- Authority
- TW
- Taiwan
- Prior art keywords
- circuit
- current
- switching
- power supply
- type constant
- Prior art date
Links
Landscapes
- Dc-Dc Converters (AREA)
Abstract
Disclosed is a switching-type constant current power supply, which comprises an alteration circuit (9) provided on the output side of a power conversion circuit (3) together with a voltage detection circuit (7), and a feedback circuit (8) provided between the voltage detection circuit (7), a current detection circuit (5) and a control circuit (4) The alteration circuit (9) is operable, during a current flow period where a load current (IL) is flowing, to set the signal level of a second feedback signal (F2) at a value less than a reference voltage (Vref) to be supplied to a common error amplifier (EA1) in a control circuit (4), and operable, during a current cut-off period where the load current (IL) is not flowing, to set the signal level of the second feedback signal (F2) at a value greater than the reference voltage (Vref). During the current cut-off period, the feedback circuit (8) is operable to supply the second feedback signal (F2) to the control circuit (4) so as to substantially discontinue the operation of the power conversion circuit (3). The switching-type constant current power supply of the present invention can stabilize the load current even under the condition that a load (e.g. display including LEDs) is repeatedly turned on and off.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003190365A JP3910941B2 (en) | 2003-07-02 | 2003-07-02 | Switching constant current power supply |
| JP2003195520A JP3910942B2 (en) | 2003-07-11 | 2003-07-11 | Switching constant current power supply |
| JP2003298305A JP3910949B2 (en) | 2003-08-22 | 2003-08-22 | Switching constant current power supply |
| US10/879,918 US7106037B2 (en) | 2003-07-02 | 2004-06-28 | Switching-type constant current power supply device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW200508831A TW200508831A (en) | 2005-03-01 |
| TWI257037B true TWI257037B (en) | 2006-06-21 |
Family
ID=37704186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW93119373A TWI257037B (en) | 2003-07-02 | 2004-06-30 | Switching-type constant current power supply device |
Country Status (1)
| Country | Link |
|---|---|
| TW (1) | TWI257037B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI397889B (en) * | 2008-01-03 | 2013-06-01 | Chi Lin Technology Co Ltd | Liquid crystal display device and method for improving flicker and residual image |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378442B (en) * | 2010-08-23 | 2014-02-05 | 杰力科技股份有限公司 | Light-emitting diode module driving device and light-emitting diode module |
| US8710505B2 (en) * | 2011-08-05 | 2014-04-29 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device |
| CN104852587B (en) * | 2015-06-03 | 2018-02-16 | 矽力杰半导体技术(杭州)有限公司 | Switched mode converter |
| JP7028205B2 (en) * | 2019-02-15 | 2022-03-02 | 株式会社オートネットワーク技術研究所 | In-vehicle power supply |
-
2004
- 2004-06-30 TW TW93119373A patent/TWI257037B/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI397889B (en) * | 2008-01-03 | 2013-06-01 | Chi Lin Technology Co Ltd | Liquid crystal display device and method for improving flicker and residual image |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200508831A (en) | 2005-03-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Annulment or lapse of patent due to non-payment of fees |