Apparatus and methods for controlling a switch drive signal following mode transitions in a switching power converter

A power converter comprising:

• a switch drive controller configured to provide a switch drive signal to switch at least one device;
• a switch control module comprising a control loop clock generator and configured to generate a switch signal;
• and
• a frequency monitor module configured to monitor the switch signal and to limit a minimum and a maximum of a frequency of the switch drive signal,
• wherein during steady state operation the switch drive signal originates from the switch control module to switch according to a switching cycle of the switch signal, and
• wherein the control loop clock generator is configured to limit the minimum and the maximum of the frequency based, at least in part, upon a minimum clock limit signal and a maximum clock limit signal.

A method of providing a switch drive signal in a resonant converter comprising:

• generating a switch signal using a switch control module;
• monitoring a switching frequency of the switch drive signal using a frequency monitor module;
• limiting a minimum switching frequency of the switch drive signal by using the frequency monitor module to limit a maximum period in response to a maximum clock limit signal;
• and
• limiting a maximum switching frequency of the switch drive signal by using the frequency monitor module to limit a minimum period in response to a minimum clock limit signal.