Inverter circuit and electric field coupling non-contact power feeding device

An inverter circuit comprising:

• a primary-side circuit including a plurality of self-excited oscillator circuits connected to a DC power supply;
• and
• a secondary-side circuit configured to output multi-phase AC power having phases different from each other according to oscillation of the plurality of self-excited oscillator circuits, wherein
• each of the plurality of self-excited oscillator circuits includes:
• a power transmission coil;
• a resonant capacitor constituting a resonant circuit together with the power transmission coil;
• a pair of switching elements connected to the power transmission coil;
• a drive coil configured to generate an induced electromotive force having a frequency corresponding to a resonance frequency of the resonant circuit, wherein the drive coil of a first self-excited oscillation circuit of the plurality of self-excited oscillator circuits applies a first voltage to each control electrode of the pair of switching elements of another self-excited oscillator circuit of the plurality of self-excited oscillator circuits according to the induced electromotive force;
• and
• a phase-shift filter,
• the secondary-side circuit includes a plurality of power reception coils, each of the plurality of power reception coils is magnetically coupled to the power transmission coil of each of the plurality of self-excited oscillator circuits,
• a second voltage is applied to each control electrode of the pair of switching elements of the first self-excited oscillation circuit from the drive coil of another self-excited oscillator circuit of the plurality of self-excited oscillator circuits, and
• each of the first and second voltages is shifted by a phase-shift amount corresponding to a number of phases of the multi-phase AC power for a respective self-excited oscillator circuit of the plurality of self-excited oscillator circuits according to at least an action of the phase-shift filter.