A digital boost converter to drive white LEDs

被引：12

作者：

Chang, Wei-Hsu ^{[1
]}

Chen, Dan ^{[2
]}

Nien, Hung-Shou ^{[1
]}

Chen, Chih-Hung ^{[1
]}

机构：

[1] RichTek Technol Corp, 5F,20 Taiyuan St, Chupei City, Hsinchu, Taiwan

[2] Natl Taiwan Univ, Dept Elect Engn, Taipei, Taiwan

来源：

APEC 2008: TWENTY-THIRD ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION, VOLS 1-4 | 2008年

关键词：

D O I：

10.1109/APEC.2008.4522776

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A constant off-time boost converter with digital control was proposed and implemented with a field-programmable-gate-array (FPGA) to power white light emitting diodes (WLEDs) for hand-held applications. In the application, a lithium-ion battery with voltage ranging from 3.3 V to 4.2 V was used to light a serial connection of 4 WLEDs drawing current levels from 2 mA to 20 mA. A constant off-time digital PWM controller was chosen to increase the dimming resolution. For the compensator design, a small-signal control model for the constant off-time converter was presented. A digital PI compensator with programmable gain was used to stabilize the control loop for different LED current levels. Experimental results are presented. Same design considerations apply to other applications if a digitally-controlled boost or buck/boost converter with high conversion gain is used.

引用

页码：558 / +

页数：2

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