The power will not turn on if the current is less than 230V. The auxiliary supply on the other hand uses TNY267 circuit and R27 facilitates protection from under-voltage of auxiliary power. It is ideal to select R1 so that the voltage at the fan and the relay coil limits to 12V. The power is obtained via the resistor from 17V auxiliary supply. The relay coil and fan, taken from AT or ATX power supply is powered from 12V. The mains voltage goes straight through the EMC filter which is further checked and filtered on C4 capacitor.Īs the capacity is high (50 amps), the inflow in the limiting circuit with Re1 switch and also on R2. The switching supply is powered with IGBT transmitters and is further controlled by UC3845 circuit.
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June 2023
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