While designing a transformer for AC-DC power converter (SCR full wave half controlled thyristor-diode bridge rectifier) with DC output power of 240W @24VDC, we picked up a transformer with rating of 600VA, 230/40VAC to account for output voltage regulation, losses in rectifier & choke of a DC LC filter.
But gradually loading the power converter to 10A drops my output voltage to as low as 21V and even my regulator couldn't help it
Is my transformer not sufficiently rated?
My circuit schematic is as below
Transformer name plate details: Rating: 600VA Primary voltage / Current: 230V AC / 2.6A Secondary voltage / current: 40V AC / 15A Frequency - 1-Phase Insulation class-F