Critical load management in secondary winding in auxiliary power supply

A power system comprising:

• a transformer comprising:
• a set of primary windings comprising a first primary winding;
• a set of secondary windings comprising a first secondary winding, a second secondary winding, and a third secondary winding;
• a set of DC to DC converters comprising a first DC to DC converter coupled to the first secondary winding, a second DC to DC converter coupled to the second secondary winding, and a third DC to DC converter coupled to the third secondary winding;
• a switch configured to operate the first primary winding;
• a control circuit configured to operate the switch, wherein the control circuit operates the switch based on a first output voltage of the first DC to DC converter, wherein a first filter inductor of the first DC to DC converter is magnetically coupled to a second filter inductor of the second DC to DC converter;
• a saturable reactor coupled to a third output of the third secondary winding and an input to the third DC to DC converter, wherein the third DC to DC converter comprises a third filter inductor in series with the saturable reactor;
• and
• a controlled current source coupled to a node between the saturable reactor and the third inductor, wherein the controlled current source is configured to provide a current rate based on a third output voltage of the third DC to DC converter.