Multi-mode Wireless Power Transmitter with Tunable Resonant Drive Circuit

The patent implements a dynamically tunable resonant drive circuit that can switch between different operating frequencies (e.g., 6.78 MHz for magnetic resonance and several hundred kHz for magnetic induction). The circuit uses variable capacitors and inductors that can be adjusted via switching mechanisms to change the resonant frequency, enabling the transmitter to adapt to different receiver types and wireless charging specifications.

The wireless power transmitter is designed to perform multiple functions by supporting both magnetic induction and magnetic resonance power transfer modes. The single transmitter unit can serve different wireless charging standards (such as Qi and AirFuel) by dynamically adjusting its operating frequency, eliminating the need for multiple dedicated transmitters for different specifications.

The patent describes a single wireless power transmitter that can operate in multiple frequency modes to support both magnetic induction receivers and magnetic resonance receivers. This multi-functional design allows one transmitter to replace what would otherwise require multiple separate transmitters, reducing system complexity and cost while maintaining broad device compatibility.

The transmitter incorporates a controllable resonant drive circuit that can dynamically adjust its operating frequency based on the type of receiver detected. The circuit includes switching mechanisms that reconfigure the LC network parameters to match the resonant frequency of the target receiver, enabling a single transmitter to serve multiple device types without requiring multiple fixed-frequency transmitters.

The patent implements a resonant drive circuit with variable LC parameters that can be adjusted to change the operating frequency. By using a class E amplifier topology with tuned output network, the circuit achieves efficient frequency switching with minimized switching losses. The resonant nature of the circuit allows for soft switching techniques that reduce parasitic losses during frequency transitions.

The patent replaces mechanical frequency adjustment mechanisms with electronic switching of capacitor and inductor configurations. The use of solid-state switching devices (such as MOSFETs or IGBTs) in a class E amplifier configuration allows for electronic control of frequency without the mechanical wear and energy losses associated with traditional mechanical tuning mechanisms.