Building and Testing a Half Bridge SMPS

Рет қаралды 3,833

Күн бұрын

Letŝ build a simple half bridge converter to learn how it works and what it's main characteristics are.
The circuit I make operates at 250 kHz and takes an input voltage of 25V.
The switching circuit operates at a 10V supply.
0:00 Intro
1:11 Building the PWM generation circuit
1:45 Building the MOSFET driver circuit & half bridge
2:35 Winding the transformer
3:42 Making the rectifier
4:40 Using a light bulb as load
Music by Kevin MacLeod: George Street Shuffle, Lobby Time

Пікірлер: 11

@user-hu7iw5cp9j 2 ай бұрын

Thank you so much! Very useful experience

@ivolol 3 ай бұрын

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

@danielzimmer1436 3 ай бұрын

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 3 ай бұрын

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 3 ай бұрын

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 3 ай бұрын

@@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.

@LegoTechnicsRule 3 ай бұрын

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

@5VLogic 3 ай бұрын

The IC TL494 assures dead times.

@Unnikrishnan99-24 3 ай бұрын

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 3 ай бұрын

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 3 ай бұрын

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