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[IEEE 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Resonant Switched-capacitor Auxiliary Circuit for Active Power Decoupling in Electrolytic Capacitor-less AC/DC LED Drivers
摘要： This paper introduces an auxiliary circuit that is used to buffer double-line-frequency ripple power and form electrolytic capacitor-less single-phase AC/DC LED drivers. The proposed auxiliary circuit is implemented by a resonant switched capacitor circuit behaving as a gyrator circuit, namely a voltage-dependent current source. The output current of the auxiliary circuit is regulated with constant on-time and hysteresis control schemes. Comparing with other alternative methods, the proposed auxiliary circuit has less power loss due to its zero-current switching (ZCS) operation, and includes smaller passive components because of its higher operating frequency (about 3 MHz). An LED driver prototype with the proposed auxiliary circuit is built, and the experimental results are given to verify the proposed topology and the parameter design.
关键词： resonant switched-capacitor circuit,ac–dc power conversion,electrolytic capacitor less,LED driver,ripple power decoupling
更新于2025-09-12 10:27:22
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Output current ripple reduction of LED driver using ceramic‐capacitor‐input circuit and buck‐boost converter
摘要： This article proposes an LED driver that consists of a ceramic-capacitor-input rectifier and a buck-boost converter. The LED driver has an advantage of long life because it does not contain any electrolytic capacitors. However, the issue with electrolytic capacitor-less LED driver is that the ripple of the smoothed voltage becomes large due to insufficient capacitance of the smoothing capacitor. The proposed method, which uses the discontinuous current mode of a buck-boost converter, reduces the output current ripple under such conditions. Experimental results using a 5.7 W LED driver prototype demonstrate that the proposed method reduces the output current ripple and that the percent flicker becomes 4.4%, which is smaller than the recommended upper limit of 8%.
关键词： ceramic capacitor,LED driver,buck-boost converter,electrolytic capacitor-less,discontinuous current mode
更新于2025-09-12 10:27:22
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New electrolytic capacitor-less LED driver based on model predictive control
摘要： The lifetime of light-emitting diode (LED) drivers is mainly affected by electrolytic capacitors. Therefore, it is necessary to eliminate electrolytic capacitors from LED drivers. Firstly, basic concept of LED driver without electrolytic capacitors is addressed in this paper. Then, a new electrolytic capacitor-less LED driver is proposed and its operation principles are analyzed in detail. In order to achieve better control effect, model predictive control (MPC) strategy is introduced in this topology. Following that, the mathematical model of the circuit which adopts MPC is derived. Finally, simulations and experiments on a 24 V, 3A laboratory prototype are carried out to verify the feasibility of the proposed topology and control strategy.
关键词： Flyback,Model predictive control,LED driver,Bidirectional cuk,Electrolytic capacitor-less
更新于2025-09-11 14:15:04