Multi-level inverter for wireless power transmission

A controller for a wireless power system, wherein the system comprises an inverter configured to output an output current and the controller is configured to generate gate drive signals for driving respective switches of the inverter, the controller comprising:

• a control module configured to generate a first control signal having a first voltage level and a second control signal having a second voltage level;
• and
• a modulator configured to (a) receive a signal representative of the output current of the inverter and (b) generate carrier signals based on the output current of the inverter, wherein the carrier signals comprise a first carrier signal and a second carrier signal such that:
• (i) when the first carrier signal is greater than the first voltage level, a first gate drive signal for a first switch is high, and
• (ii) when the second carrier signal is greater than the second voltage level, a second gate drive signal for a second switch is high,
• thereby driving the inverter to output a multi-level voltage having a first output level based on the first gate drive signal and a second output level based on the second gate drive signal.