Electronic device with frequency dithering

Control circuitry for a wireless power transmitter comprising:

• inverter drive circuitry configured to be coupled to a wireless power transmitting coil of the wireless power transmitter, the inverter drive circuitry being further configured to receive a dithered clock signal and output corresponding alternating current signals;
• and
• clock modulating circuitry configured to obtain the dithered clock signal using a modulating signal and a clock signal, wherein the modulating signal comprises, during a repeated cycle:
• a first level that causes the dithered clock signal to have a fundamental frequency;
• a second level that causes a decrease in frequency for the dithered clock signal relative to the fundamental frequency;
• and
• a third level that causes an increase in frequency for the dithered clock signal relative to the fundamental frequency, wherein the modulating signal is, during the repeated cycle, at the first level for fewer total periods than at the second level and for fewer total periods than at the third level.

Control circuitry for a wireless power transmitter comprising:

• inverter drive circuitry configured to be coupled to a wireless power transmitting coil of the wireless power transmitter, the inverter drive circuitry being further configured to receive a modified clock signal and output corresponding alternating current signals;
• and
• clock modulating circuitry configured to obtain the modified clock signal using a modulating signal and a clock signal, wherein:
• the modified clock signal has at least three different frequency levels during a repeated cycle of the modulating signal;
• the at least three different frequency levels include a fundamental frequency, a first frequency that is lower than the fundamental frequency, and a second frequency that is higher than the fundamental frequency;
• and
• the modified clock signal is, during the repeated cycle of the modulating signal, at the fundamental frequency for fewer total periods than at the first frequency and for fewer total periods than at the second frequency.