PWM regulator with bulb load

This video shows a PWM regulator output oscillogram
with 12V 21W bulb load. The supply voltage is 12V
and oscilosope settings are 5V/div and 0,5ms/div.
The PWM output current can be up to 15A without transistor heating.

Category:

Entertainment

Tags:

• PWM
• regulator
• controller
• oscilogram
• oscillogram

[KX36]

Could you use PWM of a fixed duty cycle to power a light bulb from a supply high than it's rating? e.g. Could I power a 6Vdc bulb from a 30Vdc supply with PWM of 20% duty cycle, or would the bulb be damaged?

[jawamaister]

@KX36 Yeah you can use PWM regulator for that and the bulb will survive :)

You just have to measure the voltage on a bulb with a analog instrument so that it's not to high and it will work just fine.

Thanks for comment.

[thomasomaley]

Hi: a question: how do you drive the bulb? it is DC o AC? Witch considerations you may have to make this work? What are the bulb specifications? I trying the same using regular 12V 60W bulbs but I cant figure out how to ligth it up using a regular DC power supply. I thinks it should be due to power limitation of regulators. Any thougth? Thank you very much. Nice job. :)