LLC LED Driver Small-Signal Modeling and Digital Control Design for Active Ripple Compensation

• Published in: IEEE transactions on industrial electronics (1982) Vol. 66; no. 1; pp. 387 - 396
• Main Authors: Menke, Maikel Fernando, Seidel, Alysson Raniere, Tambara, Rodrigo Varella
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.01.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: <named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> LLC</tex-math> </inline-formula> </named-content>; Active control; Active ripple compensation; Analytical models; Compensation; Converters; Equivalence; Flicker; Integrated circuit modeling; Light emitting diodes; Light modulation; light-emitting diode (LED) driver; Linear circuits; Load modeling; Mathematical model; Mathematical models; Numerical analysis; Organic light emitting diodes; Resistance; resonant converter; Resonant converters; small-signal modeling
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2018.2829683

This paper presents a new approach for the small-signal modeling of the dc-dc LLC resonant converter aimed to supply high-power light-emitting diodes (LEDs). This small-signal modeling procedure is based on the extended describing function method, where for a reliable small-signal model of the LLC LED driver, the equivalent piece-wise linear circuit of the LED has to be considered under some conditions throughout the model development. Otherwise, the obtained model does not reflect the real dynamic behavior of the converter. Furthermore, a numerical analysis is presented showing the conditions where the proposed model better describes the real dynamic behavior of the converter in relation to the traditional approach where the LED is modeled by an equivalent resistance. From the obtained model, the feedback compensator is designed and implemented in order to track the average current reference and avoid output current ripple, consequently sidestepping output light modulation (flicker). Experimental results show the feasibility of the proposed small-signal model and the active ripple compensation through a dimmable digitally controlled LLC LED driver under closed-loop operation.