Abstract
With the availability of DC grid, DC fed light emitting diode (LED) drivers need development for both low and high voltages. An efficient DC grid based LED driver is proposed for street lighting application. As the proposed configuration is with full-bridge, it is suitable with low as well as high voltage inputs and also for higher wattage lighting. Each LED load is connected across switching devices of the full-bridge configuration. The devices of the proposed configuration handle small amount of current resulting in lower conduction losses. ZVS operation is also achieved resulting in overall high efficiency. Other advantages of this configuration include lower component count, PWM dimming and possibility for extension to more loads. Analysis and operation of the driver are presented in detail. A 145 W LED driver is developed and experimentally validated for ± 5% changes in supply voltage and at different dimming levels. The peak efficiency of the proposed driver is 95.76% at full illumination level.
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