Systems and methods for low power excitation in high power wireless power systems

A system for low power excitation of a wireless power transmitter configured to transmit high power, the system comprising:

• an inverter including at least two transistors, the transistors configured to be controlled such that a phase shift angle associated with at least one transistor is adjustable during low power excitation;
• at least one variable impedance component coupled to an output of the inverter and configured to be adjusted to obtain a minimum attainable impedance during low power excitation, wherein the variable impedance components are configured to operate between the minimum attainable impedance and a maximum attainable impedance;
• and
• a resonator coil of the transmitter configured to generate a magnetic flux density less than or equal to a field safety threshold during low power excitation.

A method for low power excitation of a wireless power transmitter configured to transmit high power, the transmitter including an inverter coupled to an input of an impedance network and a transmitter resonator coil coupled to an output of the impedance network, the method comprising:

• adjusting one or more variable impedance components of the impedance network to obtain a minimum attainable impedance, wherein the variable impedance components are configured to operate between the minimum attainable impedance and a maximum attainable impedance;
• adjusting a phase shift angle associated with one or more transistors of the inverter;
• and
• driving the transmitter such that the transmitter resonator coil generates a magnetic flux density less than or equal to a field safety threshold.