Frequency management for wireless power transfer

A method of operating a wireless power transmitter in a burst mode, the method comprising:

• receiving a request from a wireless power receiver;
• responsive to the request, operating one or more switching devices of the transmitter during an on time;
• and
• subsequent to the on time, idling the one or more switching devices during an off time;
• wherein operating one or more switching devices of the transmitter during an on time comprises operating the one or more switching devices to constrain electromagnetic emissions from the wireless power transmitter within a specified bandwidth range by extending a minimum on time of each pulse of the one or more switching devices during operation.

A wireless power transmitter comprising:

• a wireless power transfer coil;
• an inverter comprising a plurality of switching devices coupled to the wireless power transfer coil;
• and
• control circuitry that drives the plurality of switching devices;
• to cause a frequency bandwidth of a wireless power transfer signal to fall within a predetermined range by extending a minimum on time of each pulse of the plurality of switching devices during operation of the inverter.