High-frequency transformers

[binaryninja]

Can someone please help me understand high-frequency transformers application and use?

When observing car inverters that usually take in 12VDC and output 110VAC/60Hz or 220VAC/50Hz they use small little transformers. I'm assuming they are high-frequency transformers. Are they actually performing any gain? I mean are they stepping up the AC output at all from the input?

Also, say I'm designing an inverter using h-bridge inverter design or even an h-bridge converter. What is the difference in using a normal power transformer and a high-frequency transformer? Are the inputs to each a different voltage? Do you have to boost the DC input to the peak AC voltage when using a high frequency transformer or is it still running off the 12V?

When I look at all the posts for inverters/boost converters someone always suggests "just use a high frequency transformer". How do you use one? I can't find any useful info on the net. I understand SMPS, I dont understand how to use a high-frequency transformer in SMPS. All the high-frequency transformers I see online from distributors have small power ratings. If I want 200W at 110AC how can I use a high-frequency transformer?

THANKS! (please help me - this has been driving me crazy)

 

[FvM]

I understand SMPS, I dont understand how to use a high-frequency transformer in SMPS.

Most off-mains SMPS are using step down "HF" transformers, you can read about their dimensioning in many application notes and reference designs. Also core manufacturers have calculations tools for the transformers,

 

[binaryninja]

Can someone please help me design a step-up transformer for a half-bridge inverter???

 

[Nisoc]

Normall ....for input 12V. you need to boost up the voltage from 12V to 110vac or 220vac

Push-pull is the good selection..then using the half bridge to convert the voltage in AC ...