Power generation and ZVS control in a power supply

An apparatus comprising:

• a controller operative to:
• monitor a resonant voltage associated with a primary winding magnetically coupled to a secondary winding;
• control a flow of current through the primary winding to produce an output voltage at the secondary winding, the flow of current through the primary winding controlled via a first switch disposed in series with the primary winding;
• control magnetization of the primary winding with respect to a detected zero crossing event associated with the monitored resonant voltage, the monitored resonant voltage generated by a first auxiliary winding magnetically coupled to the primary winding;
• and
• wherein the controller is further operative to control the flow of current through the primary winding at a valley magnitude of the monitored resonant voltage following the zero crossing event, the primary winding pre-magnetized via controlled flow of current through a second auxiliary winding magnetically coupled to the primary winding, the controlled flow of current through the second auxiliary winding occurring during deactivation of the first switch to an OPEN state.

An apparatus comprising:

• a controller operative to:
• monitor a resonant voltage associated with a primary winding magnetically coupled to a secondary winding;
• control a flow of current through the primary winding to produce an output voltage at the secondary winding;
• and
• control magnetization of the primary winding with respect to a detected zero crossing event associated with the monitored resonant voltage;
• wherein the controller is operative to execute a first mode of valley voltage switching of a first switch controlling the flow of current through the primary winding in response to a condition in which a magnitude of an input voltage supplied to the primary winding is less than a threshold value;
• and
• wherein the controller is operative to execute a second mode of peak voltage switching of a second switch coupled to an auxiliary winding magnetically coupled to the primary winding in response to a condition in which the magnitude of the input voltage supplied to the primary winding is greater than the threshold value.

A method comprising:

• monitoring a resonant voltage associated with a primary winding magnetically coupled to a secondary winding, the resonant voltage received from an auxiliary winding magnetically coupled to the primary winding and the secondary winding;
• controlling a flow of current through the primary winding to produce an output voltage at the secondary winding;
• and
• controlling a flow of current through the auxiliary winding in response to a detected zero crossing event associated with the monitored resonant voltage, the control of the flow of current through the auxiliary winding controlling magnetization of the primary winding.