Class-E Wireless Power Circuit With ZVS for Conversion Efficiency
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Solution Overview
Problem
Current wireless power transmission systems face challenges in achieving high efficiency, space savings, and cost reduction, particularly in high-frequency bands, due to limitations in power conversion efficiency and component size and cost, especially with the increasing speed of power switching devices.
Innovation Solution
The implementation of a wireless power transmission apparatus using a class-E power source with a DC-to-AC conversion circuit that employs Zero Voltage Switching (ZVS) operations, minimizing switching losses, and optimizing the design of inductors and capacitors to reduce resistance and size, while removing unnecessary components like capacitor C2 to enhance efficiency and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional wired power transmission is changed to wireless power transmission using magnetic field resonance, then wireless power transmission capability is achieved, but power conversion efficiency deteriorates
Solution Approach 1:
The patent applies parameter changes by implementing Zero Voltage Switching (ZVS) operation in the DC-to-AC conversion circuit, which changes the switching parameters to minimize switching losses. This enables the wireless power transmission system to achieve high power conversion efficiency by optimizing the operating parameters of the switching elements and resonance circuit.
Solution Approach 2:
The patent extracts and removes unnecessary components from the conventional wireless power transmission system. Specifically, it eliminates the need for complex parallel connection circuits (diodes and capacitors) by using a simplified switching circuit with only switching elements, thereby reducing component losses and improving overall power conversion efficiency.
2Volume of moving object
If component size is reduced to achieve space saving, then space efficiency is improved, but manufacturing precision requirements worsen
Solution Approach 1:
The patent merges multiple functions into fewer components. The switching circuit uses only switching elements without requiring additional diodes and capacitors, which simplifies the circuit structure and reduces the number of components. This merging approach reduces the overall component size and space requirements while avoiding the manufacturing precision issues that would arise from having more small components.
3Ease of manufacture
If the number of components is reduced to achieve cost reduction, then component cost is reduced, but system complexity worsens
Solution Approach 1:
The patent extracts and removes unnecessary components from the conventional wireless power transmission system. By eliminating diodes and capacitors from the parallel connection circuit and using only switching elements in the DC-to-AC conversion circuit, the system reduces component count and cost while maintaining or simplifying circuit complexity through the ZVS operation principle.
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 results in a high-efficiency, space-saving, and cost-effective wireless power transmission system capable of operating in high-frequency bands, maximizing power conversion efficiency and minimizing the impact of resistance on the system's performance.
Implementation Method 1
a power reception coil coupled with the power transmission coil through magnetic field resonance
Implementation Method 2
employs Zero Voltage Switching (ZVS) operations, minimizing switching losses
Data Source
AI summary
A power transmission apparatus includes a first switching element having a first and a second terminal, a first capacitor connected between the first terminal and the second terminal of the first switching element, and a power transmission inductor connected to the first switching element on a direct-current (DC) basis and configured to wirelessly transmit alternating-current (AC) power.