SMPS Topologies Overview¶
- MOSFETs are required to
- Voltage applied to the primary is half the rectified and smoothed input voltage. So, for 230V main, the primary voltage will be about 162V peak or 325V peak-to-peak.
- SMPS can be built to output up to 500 watts normally. However, it can be increased up to 650-750 watts if front-end PFC is used.1
- Power is transferred by normal transformer action.
- Secondary winding require more turns, increasing copper loss.
Power Rating Considerations¶
|100-400 W||400-1200 W||1200-3000 W|
|Active clamp flyback||✔|
|Active clamp forward||✔||✔||✔|
|LLC Half Bridge||✔||✔||✔|
|Phase shifted ZVT full bridge||✔||✔|
Half-bridge topology is best suited for applications up to 500 watts. However it can be increased up to 650-750 watts if front-end PFC is used. Ref: Microchip AN1114: Switch Mode Power Supply (SMPS) Topologies (Part I), page 21 ↩↩