Switch control scheme for wireless charging device

A method of wireless power transfer, the method comprising:

• controlling a switching circuit of a wireless charging pad with a first modulation that configures the switching circuit, the first modulation comprising two non-zero switch configurations and two different zero switch configurations, the two non-zero switch configurations comprising a positive switch configuration and a negative switch configuration;
• and
• transitioning control of the switching circuit from the first modulation to a second modulation, the second modulation comprising the two non-zero switch configurations and the two different zero switch configurations in a different sequence than the first modulation;
• wherein the switching circuit receives a voltage associated with wirelessly receiving power from another wireless charging pad.

A wireless charging pad comprising:

• an H bridge circuit;
• a resonant tank electrically connected to the H bridge circuit, the resonant tank comprising a coil arranged for wireless power transfer;
• and
• a switch control circuit configured to control the H bridge circuit using both a first modulation and a second modulation,
• wherein the first modulation comprises two non-zero switch configurations and two different zero switch configurations, and wherein the second modulation comprises the two non-zero switch configurations and the two different zero switch configurations in a different sequence than the first modulation.