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| An Electrolytic Capacitor-Less LED Driver Based on an Integrated Three-Port Converter |
| Wang Fei, Zhong Yuanxu ,Li Lin ,Ruan Yi |
| Shanghai Key Laboratory of Power Station Automation TechnologySchool of Mechatronic Engineering and Automation Shanghai University Shanghai 200072 China |
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Abstract The electrolytic capacitor is the key component that limits the lifetime of AC-DC light-emitting diode (LED) driver.Therefore,how to eliminate the electrolytic capacitor in LED drivers is a key problem.In this paper,an electrolytic capacitor-less LED driver which is integrated by Flyback converter and Buck converter was proposed.The driver is highly integrated with simple control.In the proposed circuit,the relationship between input power(pin) and output power(po) was divided into two modes: pin>po and pin<po,in order to avoid double energy conversion.The low-frequency pulse power was balanced by the energy-storage capacitor of the third port which is done by charge and discharge.Parameter design of the main circuit was addressed following the analysis of operating principle and switching-modes,as well as the control circuit.Finally,a prototype was built to verify the correctness and effectiveness of the driver.
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Received: 17 June 2015
Published: 26 December 2016
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2016, Vol. 31 
