Push-Pull vs Half Bridge

[maxplanck]

Hi friends,

I want to make 500W SMPS. 176VAC-276VAC Input range. Output 24V DC / 20A. I couldn't decide choose which one. Push-Pull or Half-Bridge. What is the advantages and disandvantages this topologies? Which one should I choose?


Thank you,


Best regards.

 

[BradtheRad]

This Wikipedia page has information which may help. See the comparison table 2/3 of the way down the page.

https://en.wikipedia.org/wiki/Switched-mode_power_supply

It shows the push-pull type as having slightly lower cost, compared to the half-bridge.

 

[E-design]

The main advantage with half bridge is reduced voltage stresses on the switching devices. This is why it is preferred for mains off-line switchers. Push-pull creates a voltage doubling stress on the devices and other problems like core stepping and saturation if you are not careful.