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LED Street Lighting Power supply

Jason

Hello All,

As we know, LED is used moreand more on street lighting, in the future, LED will replace the traditional street lighting bulb. Many supplier have there own power supply solution for LED street lighting, such as NXP, ON, PI,TI, Fairchild and so on, some solution is isolated Fly-back and some is non-isolated high voltage Buck to drive LED bulb, some solution use PFC controller and some use Valley PFC circuit to increase power factor. The question is which solution is more popular for the LED street lighting? isolated or non-isolated,  PFC controller or Valley PFC circuit?

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  • Hello Jason,

    very nice design. In fact, a single stage PFC flyback topology had been presented at Fairchild's power seminar tour this year, and the presentatino is available on our website, and you can find some reference designs at http://www.fairchildsemi.com/applications/diagrams/lighting.html (e.g. RD-009 which is based on the FL6961). It appears that valley-fill is not so much of an issue since with a full bridge rectifier the ripple is 100Hz, and you can adjust with the size of the cap to reduce it (some very few people are capable of seeing it, so it seems).

     

    If you need any further support to get your design going, please feel free to get in touch!

    alfred

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  • Hello Jason,

    very nice design. In fact, a single stage PFC flyback topology had been presented at Fairchild's power seminar tour this year, and the presentatino is available on our website, and you can find some reference designs at http://www.fairchildsemi.com/applications/diagrams/lighting.html (e.g. RD-009 which is based on the FL6961). It appears that valley-fill is not so much of an issue since with a full bridge rectifier the ripple is 100Hz, and you can adjust with the size of the cap to reduce it (some very few people are capable of seeing it, so it seems).

     

    If you need any further support to get your design going, please feel free to get in touch!

    alfred

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