Building and Testing a Half Bridge SMPS

[@ivolol]

Next video, feeding back a response voltage to the PWM using a TL431 to keep a set output voltage with varying load?

[@ЕвгенийШепард-р2х]

Thank you so much! Very useful experience

[@danielzimmer1]

Nice video! What I hate about breadboards is that when you have a problem you never know if it’s the design’s fault or the breadboard’s 😑

[@tiagoferreira086]

Nice! Keep in mind that flyback transformes cores have an air gap, and that's no good for forward converters, it may be influencing the behavior of your circuit and influence efficiency for sure.

[@5VLogic]

I forgot to mention that I ground down the ferrites to remove the gap, it's not the most beautiful solution but it works well. The important thing is that the primary inductance is sufficient, which is what the gap effects.

[@tiagoferreira086]

@@5VLogicIt doesn't need to be pretty, it only needs to work :) the only issue possible with sanding is it may not be 100% gapless due to flatness imperfections, but it wont make a huge diference anyway.

[@y2ksw1]

Is it actually possible to use a voltage multiplier (diode-condenser circuit) rather than a transformer at the output?

[@5VLogic]

I believe so, yes.

[@Unnikrishnan99-24]

Sir, I designed a 24V half-bridge SMPS with an IR2153 IC. I'm getting a 24V output, but when I connect a load, the voltage drops to around half of 24V. What is the problem, and how can I fix it?

[@5VLogic]

The voltage across the primary is always half of the input supply so I can assume 12V is correct. The over-voltage with no load can be caused by rectification of the ringing oscillations from switching transients. It's just me taking a guess though.

[@Unnikrishnan99-24]

​@@5VLogic Thank you your reply. Transformer input voltage is 150-160VDC, but decreasing input volt also.

[@LegoTechnicsRule]

How did you get the dead time between the two signals?

[@5VLogic]

The IC TL494 assures dead times.