University of Toronto

Eleappower Ltd.

Mehanathan Pathmanathan

Peter Waldemar Lehn

Sepehr Semsar

Zhichao Luo

Shuang Nie

Caniggia Castro Diniz Viana

An approach for controlling operation of an electrically symmetrical electric power circuit is described herein to reduce common mode leakage currents. The approach can include, for example, a controller circuit configured to control a plurality of switches of the electrically symmetrical electric power circuit, such that one or more electrically symmetrical pairs of switches of the plurality of switches are operated at a same operational state when the power circuit is coupled to an electrical grid to reduce the common mode leakage current. A variant is also described that is adapted for current ripple and overall THD distortion reduction, which can be useful for vehicle to grid power transfer situations.

Converter modulation for reduction of common-mode leakage current

There is described a wireless power transfer system utilizing a new excitation-quadrature-quadrature transmitter pad which includes one excitation coil and at least two decoupled quadrature auxiliary coils. A described resonant tank design method is proposed for constant-current charging and zero phase angle conditions. When there is a lateral misalignment in the receiver pad, the auxiliary coil that is better coupled with the receiver pad conducts more current than the more distant auxiliary coil does, reducing the leakage magnetic field in the surrounding area and/or improving transmission efficiency.

Excitation-quadrature-quadrature transmitter wireless power transfer system

Growing community of inventors

Toronto, Canada

Mehanathan Pathmanathan