High Power Factor Light-emitting Diode Driver on Digital Signal Processor Without Electrolytic Capacitor for High-power Lighting |
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Authors: | Yong Chen Jun Zhou Eric Hu |
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Affiliation: | 1. School of Energy Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China;2. School of Mechanical Engineering, The University of Adelaide, South Australia, Australia |
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Abstract: | Abstract—Electrolytic capacitor is a key factor that limits the life-time of the driver in a high-power light-emitting diode (LED) lighting. This article presents a high-power LED lighting driver on a digital signal processor without an electrolytic capacitor. The driver is composed of three stage circuits. The first stage is the boost power factor correction converter to achieve a high power factor. As it does not use an electrolytic capacitor, the output voltage ripple is larger, which directly affects the overall performance of the LED driver. Consequently, it must be optimized through the second and third stages. The second stage is the two-output LLC (Double inductance and capacitance) resonant converter, which is driven by a digital signal processor. This stage provides galvanic isolation and reduces voltage. The third stage is the two-input buck converter based on digital signal processor control that reduces the low-frequency ripple generated from the first two stages. Moreover, the regulation of each LED string current is achieved at this stage. The simulation and experimental results show that this LED lighting driver can achieve a high power factor and good constant current characteristics. |
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Keywords: | High power factor electrolytic capacitor without electrolytic capacitor high-power lighting light-emitting diode driver digital signal processor digital control LLC resonant converter two-input buck converter |
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