Increasing PWM duration

Liebherrguy's picture

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Joined: Mar 04, 2021

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Increasing PWM duration
March 4, 2021 - 7:36pm

Dear All,

I have such little understanding of electronics that I thought it would be better to ask for your help rather than trying to teach myself.

My enquiry will be childs play for you guys, so here goes:-

I have a motorcycle with a heated seat(< 1 amp) which is powered by 12v PWM which has 4 settings

of say 5% - 10% - 25% - 50%, controllable from the handlebars.

I would like to use the seat PWM supply to power a heated jacket (12v, 5 amp) which currently has a PWM controller outputting 50% - 75% - 100%. (BTW 100% gets far too hot)

The challenge therefore is to control a MOSFET or SSR to avoid overloading the seat supply, but to increase the PWM duration by a factor by 1.8.

Being fitted on a motorcycle, it would also need to be compact and durable.

All suggestions will be gratefully received.

 

Many thanks

 

Sourav Gupta's picture

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Joined: Feb 12, 2018

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What is the frequency of PWM? Do you have any idea?

Liebherrguy's picture

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Joined: Mar 04, 2021

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The frequency is approximately 1Hz. 
 

I have wondered since whether increasing the pulse duration by say 1/3 - 1/2 second could be simply achieved using a 555 timer etc.

many thanks

Sourav Gupta's picture

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Joined: Feb 12, 2018

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Are you sure the frequency is 1 Hz? I highly doubtful. However, in such case you could use the 555 that could be useful.