Class E Wireless Power Transmitter Matching Circuit Integration
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Solution Overview
Problem
Current wireless charging systems face challenges in designing transmitters that are compact, high-efficiency, low in Bill Of Materials (BOM), and reliable for efficient wireless power transmission to multiple devices, as they require complex circuitry and high compliance with interference and safety standards.
Innovation Solution
The use of Class E amplifiers in wireless power transmission systems, which include a transmit antenna driven by a Class E amplifier, a filter and matching circuit, and a resonant loop antenna configuration, enables efficient energy transfer through near-field coupling by matching the resonant frequencies of the transmitter and receiver, reducing transmission losses and harmonics, and using a low harmonic content output signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If complex circuitry is used to achieve high efficiency wireless power transmission, then power transmission efficiency is improved, but device complexity and Bill of Materials increase
Solution Approach 1:
The patent combines the amplifier and matching circuit into an integrated transmitter unit, reducing the number of discrete components and interconnections. The matching circuit is designed to work seamlessly with the amplifier, creating a unified power transmission system that maintains high efficiency while reducing overall complexity
Solution Approach 2:
The transmitter is designed with a universal matching circuit that can adapt to different load conditions and device types. The circuit serves multiple functions including impedance matching, harmonic filtering, and power optimization, eliminating the need for separate dedicated circuits for each function
2Productivity
If multiple devices require charging simultaneously, then charging capacity is improved, but the number of wired chargers and power sources increases making the system unwieldy
Solution Approach 1:
The wireless transmitter is designed to support multiple devices simultaneously through its ability to distribute power dynamically across multiple receive antennas. A single transmitter unit can charge multiple devices without requiring multiple separate chargers, thereby increasing charging capacity while maintaining system simplicity
Solution Approach 2:
The wireless electromagnetic field acts as an intermediary medium that enables power transfer without physical connectors. This eliminates the need for multiple wired connections and power sources, allowing multiple devices to be charged simultaneously through air coupling while avoiding the unwieldy nature of wired configurations
3Volume of moving object
If transmitter volume is reduced to achieve compact design, then portability is improved, but transmission efficiency and reliability may deteriorate
Solution Approach 1:
The patent employs a compact transmitter design where components are nested within each other. The matching circuit is integrated within the amplifier housing, and the transmit antenna is positioned to utilize the space efficiently. This nested arrangement achieves compact volume while maintaining the electrical performance and transmission efficiency required for reliable wireless power transfer
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach achieves high coupling efficiency (>30%) and reduces switching losses, allowing for efficient wireless charging of devices with a low BOM and simplified circuitry, while maintaining reliability and compliance with interference standards.
Implementation Method 1
a transmit antenna driven by a Class E amplifier
Implementation Method 2
enables efficient energy transfer through near-field coupling by matching the resonant frequencies of the transmitter and receiver
Implementation Method 3
matching the resonant frequencies of the transmitter and receiver
Implementation Method 4
a filter and matching circuit
Data Source
AI summary
Exemplary embodiments are directed to wireless power transfer. A wireless power transmitter includes a transmit antenna configured as a resonant tank including a loop inductor and an antenna capacitance. The transmitter further includes an amplifier configured to drive the transmit antenna and a matching circuit operably coupled between the transmit antenna and the amplifier. The transmitter also includes a capacitor integrating the antenna capacitance and a matching circuit capacitance.