dc-dc boost converter using supercap

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aspirecole

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im designing a boost converter, my input is 1 pack of supercap. the design should give 24V output.
the problem now is the voltage of the supercap is decreasing by time. how should i control the duty cycle of the pwm to make it constant 24 V for the output
 

i think it doesn't work. when suppercap voltage is decreasing less than 24v, the output can't equal 24v.
 

I think it doesn't work. when suppercap voltage is decreasing less than 24v, the output can't equal 24v.
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So you say, you didn't yet hear about boost converters? https://en.wikipedia.org/wiki/Boost_converter
how should i control the duty cycle of the pwm to make it constant 24 V for the output
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The usual method is a voltage control loop generating variable pulse width. Any popular pwm controller can do, e.g. UC3842.

Instead of feedback control, you can theoretically use forward control, varying the pulse width with supercap voltage using an a priori characteristic. But the method won't be aware of load dependcy and non-ideal converter behaviour.
 


are you using transformer.
 

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