It looks like a bare core, are you going to wind your own transformer?
yeah i will wind it myself thats no problem
You may also consider to use more turns to reduce the flux in the core. This will reduce the power rating of the transformer, but increases the efficiency under low and moderate loads.
please can you explain a little about this.
I have a 625VA toroidal transformer sitting overhere that has OD=0.16m (with wire, so the actual core is smaller). So if it is a good quality core, >500VA should be possible.
i pray i can push it up to 1KVA
About your 1000W. From 12V supply that is 84A average consumption from your battery. As you may know you need to have a good reserve, so you bridge should be able to switch more then that (think of 150A).
ok here i planned to use 24volts, so if i could go by your calculation. it should be 42A on average consumption and that should be around 75-80A from the bridge
Number of mosfets.
Imagine you use 6 mosfets (IRF 540) in parallel, each with its own gate resistor.
Each mosfet has 0.12 Ohm Rdson (100 degrees die temperature). The resistance for each of the four switches will be 19 mOhm. Each switch uses 6 mosfets.
At 84A 50% duty cycle that will be 70W dissipation/switch. As you have 4 switches, dissipation will be 280W. In real world it will be more as you use modified sinewave.
please here i need to understand this part. do u mean for the full bridge i will need 24 mosfets that is six mosfets in parallel on the high side and six mosfets in parallel down for each of the half bridge. please explain
So simple calculation shows what to expect. As you are using a full bridge, you may select mosfets with a lower voltage rating (as you don't get voltage spikes due to leakage induction of the transformer). Such mosfets have less Rdson, hence less dissipation and better efficiency.
Dead time.
As you want to use modified sine wave, dead time (that is the time duration that all mosfets are in the off state) will be about 7 ms.
how can i achieve this with SG3525
Probably you will not invest in large electrolytic capacitors. In that case this concept will work well when you place all electronics close to the battery. Otherwise will get large voltage spikes at the supply of the bridge.
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