What happens when "Flashing front headlamps on a car"

[Dan Mills]

Resistor across the L to lower the Q factor, increasing the value of the cap on the input side of the filter will also lower the Q as well as the resonant frequency.

Plenty of things that can be done, so I dont see why you would claim it requires significant extra circuitry to sort out.

Regards, Dan.

 

[FvM]

Plenty of things that can be done, so I dont see why you would claim it requires significant extra circuitry to sort out.

It's too short-sighted to start with a predefined switcher topology (a standard asynchronous boost converter) and arrange it to the application. It's neither fixed to use a boost converter nor must it be asynchronous (transistor-diode switch combination). Instead choose a topology with better dynamical behaviour. You can safely assume that the major manufacturers who offer LED headlight solutions already did.

 

[treez]

I think that most cars now with leds, don't have a relay in the supply line to the lamp, but instead have perhaps multiple control wires additionally running to the lamp to switch it on/off, dim it, etc etc. This extra wiring, is , I think, a disadvantage of led vs incandescent. It would be best if led could be enabled to work with the simple relay method, and no extra wires.

I think the company I was working for was possibly struggling with LC resonance because they were retrofitting led into cars that were previously incandescent.