Series–Parallel Autoregulated Charge-Balancing Rectifier for Multioutput Light-Emitting Diode Driver

Author

Xinke Wu ; Chen Hu ; Junming Zhang ; Chen Zhao

Author_Institution

Sch. of Electr. Eng., Zhejiang Univ., Hangzhou, China

Volume

61

Issue

3

fYear

2014

fDate

Mar-14

Firstpage

1262

Lastpage

1268

Abstract

A series-parallel autoregulated rectifying circuit is proposed for a multioutput dc/dc light-emitting diode (LED) driver. The series-parallel autoregulated characteristics balance the charge in the secondary blocking capacitors automatically. Hence, with the proposed rectifier and secondary-side multiwinding transformer, a multioutput LED driver with precise current-sharing capability is achieved even for multiple LED strings with different voltages. The operating principle of the rectifier is analyzed with a sinusoidal current source and is verified with a four-output LLC dc/dc LED driver. This proposed rectifier can be applied to other converters featuring a high-frequency current source link at the primary side.

Keywords

DC-DC power convertors; LC circuits; capacitors; constant current sources; driver circuits; light emitting diodes; rectifiers; rectifying circuits; transformer windings; converter; current-sharing capability; four-output LLC DC-DC LED driver; multioutput DC-DC light-emitting diode driver; multiple LED string; secondary blocking capacitor; secondary-side multiwinding transformer; series-parallel autoregulated charge-balancing rectifier; series-parallel autoregulated rectifying circuit; sinusoidal current source; Capacitance; current sharing; light-emitting diode (LED) driver; multioutput;

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/TIE.2013.2257150

Filename

6494633