LLC LED Driver Small-Signal Modeling and Digital Control Design for Active Ripple Compensation
| Autor: | Álysson Raniere Seidel, M. F. Menke, Rodrigo V. Tambara |
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| Rok vydání: | 2019 |
| Předmět: |
Equivalent series resistance
Computer science 020208 electrical & electronic engineering Ripple Describing function 02 engineering and technology Compensation (engineering) law.invention Control and Systems Engineering law Control theory 0202 electrical engineering electronic engineering information engineering Digital control Electrical and Electronic Engineering Resonant converter Linear circuit Light-emitting diode Diode |
| Zdroj: | IEEE Transactions on Industrial Electronics. 66:387-396 |
| ISSN: | 1557-9948 0278-0046 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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