Efficient Power Conversion Corporation

Yuanzhe Zhang

Michael Andrew De Rooij

John Stanley Glaser

Jianjing Wang

A physical arrangement of at least two power switches and at least one capacitor in a power loop. At least one of the switches is formed of at least two parallel electronic devices, such as transistors. The arrangement minimizes total power loop impedance and results in approximately equal impedance in each parallel branch of the switch formed of two parallel devices, thereby resulting in approximately equal currents in the switches.

Half-bridge circuits with symmetrical layout of parallel transistors and capacitors

A multi-level converter includes a flying capacitor and a resistive voltage divider. The multi-level converter is configured to convert an input voltage into an output voltage. The resistive voltage divider is configured to charge a flying capacitor in the multi-level converter during an initial charging mode of operation. In some implementations, the multi-level converter includes a plurality of flying capacitors and a plurality of resistive voltage dividers including a resistive voltage divider for each flying capacitor in the plurality of flying capacitors.

Multi-level converter with voltage divider for pre-charging flying capacitor

A large area wireless power system having a synchronization transmitter and a plurality of synchronization receivers for receiving a plurality of differential signals from the synchronization transmitter and outputting a plurality of second single-ended signals. The synchronization transmitter generates a first single-ended signal and converts the first single-ended signal into the plurality of differential signals to be transmitted to the synchronization receivers over a plurality of differential line pairs that also provide power to the synchronization receivers. The large area wireless power system also includes a plurality of high power amplifiers for receiving the plurality of second single-ended signals from the respective synchronization receivers and generating power, and a plurality of wireless power coils for receiving the power generated by the plurality of high power amplifiers and wirelessly providing power.

Multi-coil large area wireless power system

A scalable highly resonant wireless power coil structure that is suitable for use across a large surface area. The structure includes a plurality of single turn loops with adjacent loops that are decoupled from each other, yet form part of a single member.

Large area scalable highly resonant wireless power coil

A wireless power receiver circuit includes an active rectifier circuit with a plurality of power transistors, wherein the active rectifier circuit is configured to rectify an induced AC receiver current. The wireless power receiver circuit includes also includes a gate drive controller circuit configured to sense the induced AC receiver current and to provide gate drive signals for the plurality of power transistors synchronized with the induced AC receiver current. The gate drive controller circuit includes a current sense circuit configured to provide two voltage signals having a difference proportional to the induced AC receiver current.

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Torrance, CA, United States of America

Yuanzhe Zhang