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TW200723957A - Charge pump drive circuit for a light emitting diode - Google Patents

Charge pump drive circuit for a light emitting diode

Info

Publication number
TW200723957A
TW200723957A TW094144275A TW94144275A TW200723957A TW 200723957 A TW200723957 A TW 200723957A TW 094144275 A TW094144275 A TW 094144275A TW 94144275 A TW94144275 A TW 94144275A TW 200723957 A TW200723957 A TW 200723957A
Authority
TW
Taiwan
Prior art keywords
current
light emitting
emitting diode
charge pump
voltage source
Prior art date
Application number
TW094144275A
Other languages
Chinese (zh)
Other versions
TWI294256B (en
Inventor
Tien-Tzu Chen
Chia-Hung Tsen
Original Assignee
Aimtron Technology 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 Aimtron Technology Corp filed Critical Aimtron Technology Corp
Priority to TW94144275A priority Critical patent/TWI294256B/en
Publication of TW200723957A publication Critical patent/TW200723957A/en
Application granted granted Critical
Publication of TWI294256B publication Critical patent/TWI294256B/en

Links

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

Through operated alternately between a charging phase and a discharging phase, a charge pump converts an input voltage source into a drive voltage for being supplied to a light emitting diode. A current setting unit determines a reference current. A current regulating unit has a current regulating terminal and a feedback detecting terminal. The current regulating terminal is coupled to the light emitting diode so as to control a current flowing through the light emitting diode to be proportional to the reference current. The feedback detecting terminal provides a feedback signal representative of a current regulation characteristic voltage. Based on a difference between the feedback signal and a reference voltage source, an error amplifier generates an error signal. A variable resistance unit is coupled between the input voltage source and the charge pump for adjusting a variable resistance in response to the error signal.
TW94144275A 2005-12-14 2005-12-14 Charge pump drive circuit for a light emitting diode TWI294256B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW94144275A TWI294256B (en) 2005-12-14 2005-12-14 Charge pump drive circuit for a light emitting diode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW94144275A TWI294256B (en) 2005-12-14 2005-12-14 Charge pump drive circuit for a light emitting diode

Publications (2)

Publication Number Publication Date
TW200723957A true TW200723957A (en) 2007-06-16
TWI294256B TWI294256B (en) 2008-03-01

Family

ID=45068100

Family Applications (1)

Application Number Title Priority Date Filing Date
TW94144275A TWI294256B (en) 2005-12-14 2005-12-14 Charge pump drive circuit for a light emitting diode

Country Status (1)

Country Link
TW (1) TWI294256B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI403080B (en) * 2009-08-24 2013-07-21 Green Solution Tech Co Ltd A charge pump circuit with current detecting and method thereof
TWI417855B (en) * 2009-08-19 2013-12-01 Himax Tech Ltd Liquid crystal display and charge pump thereof
TWI455646B (en) * 2008-02-05 2014-10-01 Richtek Technology Corp Current regulator and its control method
TWI468080B (en) * 2008-07-31 2015-01-01 Richtek Technology Corp LED drive device and method
TWI498046B (en) * 2007-12-21 2015-08-21 Niko Semiconductor Co Ltd A led driving circuit and a secondary side controller thereof

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI408643B (en) * 2008-09-18 2013-09-11 Richtek Technology Corp Led display system and control method thereof and driver of the led display system and control method for the driver
TWI399128B (en) * 2008-10-31 2013-06-11 Advanced Analog Technology Inc Method and circuit of controlling an led charge pump driving circuit
US9713211B2 (en) 2009-09-24 2017-07-18 Cree, Inc. Solid state lighting apparatus with controllable bypass circuits and methods of operation thereof
US10264637B2 (en) 2009-09-24 2019-04-16 Cree, Inc. Solid state lighting apparatus with compensation bypass circuits and methods of operation thereof
US8742671B2 (en) 2011-07-28 2014-06-03 Cree, Inc. Solid state lighting apparatus and methods using integrated driver circuitry
US9510413B2 (en) 2011-07-28 2016-11-29 Cree, Inc. Solid state lighting apparatus and methods of forming
US9277605B2 (en) 2011-09-16 2016-03-01 Cree, Inc. Solid-state lighting apparatus and methods using current diversion controlled by lighting device bias states
US8791641B2 (en) * 2011-09-16 2014-07-29 Cree, Inc. Solid-state lighting apparatus and methods using energy storage
US9374858B2 (en) 2012-05-21 2016-06-21 Cree, Inc. Solid-state lighting apparatus and methods using switched energy storage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI498046B (en) * 2007-12-21 2015-08-21 Niko Semiconductor Co Ltd A led driving circuit and a secondary side controller thereof
TWI455646B (en) * 2008-02-05 2014-10-01 Richtek Technology Corp Current regulator and its control method
TWI468080B (en) * 2008-07-31 2015-01-01 Richtek Technology Corp LED drive device and method
TWI417855B (en) * 2009-08-19 2013-12-01 Himax Tech Ltd Liquid crystal display and charge pump thereof
TWI403080B (en) * 2009-08-24 2013-07-21 Green Solution Tech Co Ltd A charge pump circuit with current detecting and method thereof

Also Published As

Publication number Publication date
TWI294256B (en) 2008-03-01

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