How to Convert 220V 50Hz to 115V, 28V, 26V 400Hz for School Project Circuit?

✨ The discussion addresses converting a 220V 50Hz AC supply to multiple outputs of 115V, 28V, and 26V at 400Hz for a school project. The simplest approach suggested involves rectifying the 220V 50Hz AC to DC (~300V), then using a DC/AC inverter to generate a 400Hz AC output. Challenges include designing or modifying power supplies, as typical PC AT/ATX power supplies operate at much higher switching frequencies (30-70 kHz) and are not directly suitable. Power requirements are critical; the user specifies a load of approximately 25A, equating to about 700W at 28V, necessitating an amplifier and transformer rated around 850W to accommodate losses. One practical solution involves using an audio power amplifier combined with a sine wave generator to produce a 400Hz sine wave, then stepping up the voltage via a transformer capable of handling 400Hz operation. Another method demonstrated includes using a 220V to 30V 50Hz step-down transformer connected in reverse, with output voltage adjusted by varying the input amplitude to the audio amplifier. The user seeks a block diagram for supplying multiple voltages (115V, 28V, 26V) from the same source, with further details on current requirements pending. Designing and fabricating such a circuit requires experience and appropriate equipment, and the discussion emphasizes the importance of specifying exact current demands for each voltage output to optimize the power amplifier and transformer selection.
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