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Thread: Does increasing ramp time limit LED In-Rush Current?

  1. #1
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    Does increasing ramp time limit LED In-Rush Current?

    I was wondering whether there is any way to limit In-Rush current of LEDs by increasing or decreasing the ramp time. In particular if you have LED MR-16 bulbs on a magnetic transformer. With halogen bulbs on MLV, I was told that it was better to have a 2-3 second ramp time to avoid tripping breakers and overall put less pressure on dimmers or RPMs, but I haven't heard anything about LEDs on MLV or LEDs in general. In other words, would having a 5 second ramp time produce less in-rush current than 0 seconds? What if it was just a switch and not a dimmer at all? Would that help?

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    In-rush is a function of the load type and size. By adding ramp time you are effectively reducing the initial load. However, in-rush should never cause the breaker to trip. Unless you have the circuit way, way, way overloaded. LEDs on a straight MLV transformer (non-driver) is a bad idea. LEDs generate some high frequency noise. This noise gets fed back through the MLV transformer and it is multiplied by 10. LEDs on a MLV can draw a lot more current than normal. They need the electronics in the driver to regulate the power.
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  3. #3
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    Quote Originally Posted by randyc View Post
    In-rush is a function of the load type and size. By adding ramp time you are effectively reducing the initial load. However, in-rush should never cause the breaker to trip. Unless you have the circuit way, way, way overloaded. LEDs on a straight MLV transformer (non-driver) is a bad idea. LEDs generate some high frequency noise. This noise gets fed back through the MLV transformer and it is multiplied by 10. LEDs on a MLV can draw a lot more current than normal. They need the electronics in the driver to regulate the power.
    How much more power LEDs on a MLV gets?
    Regards, Boreithen Showbox

  4. #4

    William russ

    I'm curious whether the in-rush current that LED drivers are known for are influenced by dimming and if so, do increasing the ramp time help alleviate that? In other words, if you have have the LED lights on just a switch vs. on a dimmer that takes 5 seconds to go from 0-100%, which produces less inrush current?
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