Abstract: Described herein are multi-level inverters configured for a wireless power system and methods for such inverters and systems. The inverter includes at least one capacitor and at least one switching leg. Each switching leg including a plurality of switches having at least one switch coupled to the at least one capacitor. The plurality of switches of each switching leg are configured to be controlled such that, during operation: (i) an output voltage is produced, the output voltage having an asymmetric multilevel profile with at least four non-zero unequal voltage levels and (ii) at least one switch of the plurality of switches operates with zero-voltage switching.

Abstract: Described herein are controllers configured for a wireless power system and methods for such controllers and systems. The controller includes 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 and (b) generate carrier signals based on the output current. When a first carrier signal is greater than the first voltage level, a first gate drive signal for a first switch is high and when a second carrier signal is greater than the second voltage level, a second gate drive signal for a second switch is high, thereby driving an inverter to output a multi-level voltage having a first output level based on the first drive signal and a second output level based on the second drive signal.

Abstract: A combination toothbrush, floss dispenser and tongue scraper apparatus is provided. The apparatus comprises an elongated member having a first end with a brush head and having an opposite second end with a tongue scraper and having an inner cavity with a floss dispenser disposed within the member between the brush head and the tongue scraper. A lid is hinged at a substantially central section of the elongated member for enclosing or providing access to the inner cavity by movement between open and closed positions relative to the inner cavity.