期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 38, 期 10, 页码 12834-12845出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2023.3292906
关键词
Light-emitting diode (LED) driver; peak-current-mode (PCM); single-inductor dual-output (SIDO); small signal model; transient cross-regulation
In this article, a PCM-controlled SIDO buck LED driver is proposed to achieve independent dimming and eliminate steady-state cross-regulation. The circuit and principle of the driver are presented, and its small signal model is established. Control parameters and capacitor parameters are analyzed to investigate their effects on the driver's performance and stability. Experimental results validate the effectiveness and stability of the designed driver.
Single-inductor dual-output (SIDO) dc-dc converter has been applied to light-emitting diode (LED) drivers with its advantages of small volume and low cost. Peak-current-mode (PCM) control of the SIDO converter has the advantages of fast transient performance and suppressed cross-regulation. A PCM-controlled SIDO buck LED driver to achieve independent dimming and to eliminate the steady-state cross-regulation is proposed in this article. The circuit and the principle of the PCM-controlled SIDO buck LED driver are presented, and its small signal model is established based on inductor current ripple. Furthermore, based on control-to-output loop gain transfer functions, control parameters of PCM-controlled SIDO buck LED driver are designed to achieve independent output current regulation of each LED driver. Besides, cross-regulation transfer functions are obtained to investigate the effect of reference signals and control parameters on the transient cross-regulation. Moreover, the effect of capacitor parameters on the stability of the LED driver is analyzed based on the bifurcation diagram. Finally, experimental results are provided to show the independent dimming capability of PCM-controlled SIDO buck LED driver with designed parameters, and the validity of the theoretical analysis on transient cross-regulation and stability of the LED driver.
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