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Boost converter not boosting

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P.V.VISHNU

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I have designed the boost converter and simulated using multisim. In real-time, boost converter not boosting the voltage instead the voltage was decreasing.
Input voltage from solar panel (50W) Vmp=17.6, Imp=2.86.
Required output voltage =24V, L(Toroidal)=375µH, C=470µF, Load=22Ω,50W.
switching frequency=5kHz.
 

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Hi,

In worst case the output should never be less than input voltage - 1V.
(Exact value depends on circuit, and device values)

So if you see too low output voltage, then I assume your input voltage will drop, too.

Klaus
 

KlausST said:
Hi,

In worst case the output should never be less than input voltage - 1V.
(Exact value depends on circuit, and device values)

So if you see too low output voltage, then I assume your input voltage will drop, too.

Klaus
Click to expand...

Input voltage is equal to output voltage at duty cycle 0. When duty cycle increased the output voltage was decreasing but no drop in input voltage.
Without load boost converter boost the voltage gradually.
 

Hi,

Input voltage is equal to output voltage at duty cycle 0. When duty cycle increased the output voltage was decreasing but no drop in input voltage.
Without load boost converter boost the voltage gradually.
Click to expand...

This makes no sense.

* At 0% duty cycle there will be at least the voltage drop of the diode.
* with duty cycle... at which device (only L or D possible) should be the voltage drop?
* without load the voltage may increase relatively fast without dedicated limit. Could be dangerous..at least for the transistor.

Do you have a scope?
Post a foto of your circuit.

Btw: with 50% duty cycle = 100us,
375uH and 24V you may expect a current rise in the L of 6.4A

Klaus
 

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