The weak signal from the Arduino is now on the steroid with exactly same phase difference etc.Ĭonstruction of Three Phase Transformer Using Three Single Phase Transformer: The output signal from the MOSFET is 180 degree inverted (again) from the BJT’s output, now we got zero degree phase shift with respect to Arduino’s output. The output at the MOSFET is now a strong which can drive the three phase transformer. Now the 12V (from BJTs) signal is applied to MOSFETs which is also configured in push-pull. If we directly apply the 5V signal from Arduino to gate of the MOSFET, the MOSFET will still switch ON and OFF (partially) but there will be huge resistance between source and drain terminal which will not allow maximum current to flow and cause MOSFETs to overheat. The 5V signal from Arduino is now amplified to 12V signal which is sufficient for a MOSFETs to turn ON and OFF(fully). The output signal from BJT is inverted by 180 degree from the applied signal (for all three phases).
The BJT is configured in push-pull configuration so that it can amplify both LOW and HIGH signals now three such push-pull stages are implemented in the circuit. The feeble three phase signals are pre-amplified by a couple of low power BJTs per phase signal. The generated three phase signal cannot be applied directly to the transformer to step-up to do this the three phase signals are applied to a buffer stage which consists of BJTs and MOSFETs.Īre 50Hz and 50% duty cycle with respect to ground. As we can see that each waveform are 120 degree electrically shifted from each other.
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