Push-pull driver for generating a signal for wireless power transfer

A method for transferring power wirelessly such that a waveform produced at an output node is not a substantially square waveform, comprising:

• generating, by a first circuit, a first signal, the first circuit comprising a first inductor;
• generating, by a second circuit, a second signal out of phase with the first signal, the second circuit comprising a second inductor inductively coupled with the first inductor, the first inductor and the second inductor sharing a node, the first inductor and the second inductor having a leakage inductance of at least a minimum value so as to not produce the substantially square waveform at an output of the first circuit and at an output of the second circuit;
• filtering the first signal and the second signal;
• and
• driving a load based on the filtered first signal and the filtered second signal.

An apparatus for transferring power wirelessly such that a waveform produced at an output node is not a substantially square waveform, comprising:

• means for generating a first signal, the means for generating the first signal comprising a first means for storing energy in a magnetic field;
• means for generating a second signal out of phase with the first signal, the means for generating the second signal comprising a second means for storing energy in a magnetic field inductively coupled with the first means for storing energy in a magnetic field, the first means for storing energy in a magnetic field and the second means for storing energy in a magnetic field sharing a node, the first means for storing energy in a magnetic field and the second means for storing energy in a magnetic field having a leakage inductance of at least a minimum value so as to not produce the substantially square waveform at an output of the means for generating the first signal and at an output of the means for generating the second signal;
• means for filtering the first signal and the second signal;
• and
• means for driving a load based on the filtered first signal and the filtered second signal.

A non-transitory computer-readable medium comprising code that, when executed, causes an apparatus to:

• generate, by a first circuit, a first signal, the first circuit comprising a first inductor;
• generate, by a second circuit, a second signal out of phase with the first signal, the second circuit comprising a second inductor inductively coupled with the first inductor, the first inductor and the second inductor sharing a node, the first inductor and the second inductor having a leakage inductance of at least a minimum value so as to not produce a substantially square waveform at an output of the first circuit and at an output of the second circuit;
• filter the first signal and the second signal;
• and
• drive a load based on the filtered first signal and the filtered second signal.