An apparatus comprising: a transformer; a first rectifier coupled to the transformer and configured to provide a regulated power supply to a first power supply node (Vout1); a second rectifier coupled to the transformer and configured to provide an un-regulated power supply to a second power supply node (Vout2); the apparatus being further characterized by comprising: an energy transfer unit coupled to the first and second power supply nodes and operable to transfer energy from the first power supply node to the second power supply node in response to a control signal; and a control circuit comprising control logic configured to monitor a direction of current flowing between the first and second power supply nodes, wherein the control circuit is further configured to generate the control signal to cause the energy transfer unit to transfer energy from the first power supply node to the second power supply node in response to determining that a voltage at the first power supply node is above a threshold voltage when the second power supply node is in a high power mode, and generate the control signal to stop the energy transfer unit from transferring energy when the control logic detects a reversal of current direction, wherein the high-power mode is detected, by the control circuit, based on an above normal current value. a transformer; a first rectifier coupled to the transformer and configured to provide a regulated power supply to a first power supply node (Vout1); a second rectifier coupled to the transformer and configured to provide an un-regulated power supply to a second power supply node (Vout2); the apparatus being further characterized by comprising: an energy transfer unit coupled to the first and second power supply nodes and operable to transfer energy from the first power supply node to the second power supply node in response to a control signal; and a control circuit comprising control logic configured to monitor a direction of current flowing between the first and second power supply nodes, wherein the control circuit is further configured to generate the control signal to cause the energy transfer unit to transfer energy from the first power supply node to the second power supply node in response to determining that a voltage at the first power supply node is above a threshold voltage when the second power supply node is in a high power mode, and generate the control signal to stop the energy transfer unit from transferring energy when the control logic detects a reversal of current direction, wherein the high-power mode is detected, by the control circuit, based on an above normal current value. an energy transfer unit coupled to the first and second power supply nodes and operable to transfer energy from the first power supply node to the second power supply node in response to a control signal; and a control circuit comprising control logic configured to monitor a direction of current flowing between the first and second power supply nodes, wherein the control circuit is further configured to generate the control signal to cause the energy transfer unit to transfer energy from the first power supply node to the second power supply node in response to determining that a voltage at the first power supply node is above a threshold voltage when the second power supply node is in a high power mode, and generate the control signal to stop the energy transfer unit from transferring energy when the control logic detects a reversal of current direction, wherein the high-power mode is detected, by the control circuit, based on an above normal current value.