Tahmid
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If you plan to use H-bridge, you need hi-lo side drivers for the H-bridge. So, add 2 drivers to the list of major semiconductor devices. The IR2110/IR2113 are very popular drivers. You can also use drivers such as L6385E, L6387, etc.Let's take ROCKET SCIENTIST's requirement (650VA, 230V, 50Hz) as an example to learn more about designing an efficient Inverter.
For more clarification, I'm describing high level steps to make an Inverter after reading the valuable posts (specially Tahmid & Goldsmith) of this thread.
1. DC 12V to DC *400v(?) converter
2. Filtering the DC voltage to be used as input of the inverter
3. DC 400v to AC 230v Inverter
4. Filtering the inverter output voltage to get pure(!) 50Hz 230v AC
Stage-1: DC 12V to DC 400v converter
Let's chose full bridge converter with 50kHz modulation frequency and Ferrite core transformer
Major semiconductor devices -
a) IC SG3525
b) MOSFET IRF3205
Taking minimum voltage of battery as 11v, max. current drawn from the battery = 650/11=60Amp,
Now, adding extra 25% current to this value considering inverter efficiency as 80% the final value reaches 75Amp.
So, the transformer's primary current ratting should be 75Amps. Hence, the transformer ratting should be - primary side 12v, 75amp; secondary side 400v (?), 2.25Amp
*Q1: What should be the secondary voltage (here we used 400v) of the transformer and how can we calculate this value to get desired output of 230v AC?
We'll get 400v unfiltered DC here.
Stage-2: Filter
Please comment to make appropriate filter circuit with calculation...
Add 2 drivers to the list of major semiconductor devices. You'll need 2 hi-lo side drivers (eg IR2110/IR2112, L6385E/L6387, etc).
Stage-3: DC 400v to AC 230v Inverter
Let's chose H-Bridge SPWM Inverter with 48kHz modulation frequency
Major semiconductor devices -
a) Any suitable Microcontroller chip capable of generating gate pulse for the MOSFETs.
b) MOSFET IRFP460
At the end of this stage we'll get 230v AC (unfiltered)
Stage-4: Filter
Please comment to make appropriate filter circuit with calculation to get 50Hz pure sine wave AC voltage...
Question to all experts: Is this okay? Please provide your valuable feedback for each and every important stages to complete it.
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