Class E Amplifier Gate Driver for Wireless Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional gate drivers in wireless power transfer systems suffer from high power loss and output signals with significant harmonic content, which are not suitable for efficient and low-emission applications.
Innovation Solution
A wireless power transmitter system utilizing a Class E amplifier as a gate driver, converting square wave signals to sinusoidal wave signals and employing a transformer to generate differential pairs, which reduces power loss and electromagnetic interference by applying low-order harmonics to the gate of the main power amplifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional gate drivers are used in wireless power transfer systems, then the system can operate with conventional circuit designs, but the power loss increases and output signal quality deteriorates due to high harmonic content
Solution Approach 1:
The patent changes the waveform parameter from square wave to sinusoidal wave by implementing a Class E amplifier gate driver. This parameter change transforms the output signal characteristics, reducing harmonic content and improving power efficiency in wireless power transfer systems.
Solution Approach 2:
The patent replaces traditional gate driver circuitry with a Class E amplifier-based gate driver. This substitution introduces a different operational mechanism that achieves cleaner output signals and lower power loss through its inherent sinusoidal output characteristic.
2Reliability
If traditional gate drivers are used, then the circuit design remains simple, but power efficiency decreases and electromagnetic interference increases
Solution Approach 1:
The Class E amplifier gate driver changes the operating parameter from square wave to sinusoidal wave, which inherently reduces electromagnetic interference and improves power efficiency. The sinusoidal waveform contains fewer harmonics, directly addressing the EMI problem while maintaining reliable power transfer.
3Productivity
If square wave signals are applied to the gate driver, then the circuit operation is straightforward, but the output signal contains significant harmonics that reduce transmission efficiency
Solution Approach 1:
The patent implements parameter change by transforming the gate driver output from square wave to sinusoidal wave. This change directly improves wireless power transfer efficiency by reducing harmonic content that would otherwise cause energy loss during transmission.
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
The system achieves 100% theoretical power efficiency with minimal power loss and reduced electromagnetic interference, enabling efficient wireless power transfer.
Implementation Method 1
A gate driver, e.g., a class E amplifier, is configured to convert a first oscillating signal to a second oscillating signal. The first oscillating signal is a square wave signal and the second oscillating signal is a sinusoidal wave signal.
Implementation Method 2
A transformer is configured to convert the second oscillating signal to a differential pair of signals.
Data Source
AI summary
A wireless transmitter is described herein that provides power wirelessly to an apparatus with high efficiency. For example, the wireless power transmitter may include a class E amplifier that is used as a gate driver for a main power amplifier. This advantageously enables power to be transmitted wirelessly with a 100% theoretical power efficiency and with minimal power loss. Furthermore, electromagnetic interference (EMI) issues are reduced because only low orders of harmonics are applied to the gate of the main power amplifier. A system that incorporates such a wireless transmitter and methods of operating the same are also described herein.