Master-Slave Voltage Doubling Rectifier for Wireless Power
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Solution Overview
Problem
Existing rectifiers face a trade-off between conversion efficiency and circuit complexity, with high-efficiency active rectifiers being overly complex and simple passive rectifiers having low efficiency, while wireless charging applications require both high efficiency and a compact design.
Innovation Solution
A master-slave voltage doubling full-wave rectifier is developed, utilizing two electronic switches, six diodes, and four capacitors to achieve high conversion efficiency through phase division switching and voltage doubling, reducing power loss with differential input signals and a filter capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If active rectifying circuitry is used to achieve high conversion efficiency (85%-96%), then conversion efficiency is improved, but device complexity increases significantly due to complicated circuitry framework
Solution Approach 1:
The rectifier is divided into a master stage and a slave stage, each handling specific rectification tasks. The master stage processes one half-cycle while the slave stage processes the other half-cycle, allowing independent optimization of each stage and reducing overall circuit complexity while maintaining high efficiency
Solution Approach 2:
The patent employs dynamic switching of electronic switches (MOSFETs) that are controlled by voltage comparison circuits. The switches dynamically adjust their state based on the input voltage polarity and magnitude, enabling the circuit to adaptively optimize performance across different operating conditions without requiring a complex fixed architecture
2Device complexity
If passive rectifying circuitry is used to maintain simple structure, then device complexity is reduced, but conversion efficiency deteriorates to only 55%-65%
Solution Approach 1:
The patent replaces traditional passive diode-based rectification with active electronic switch-based rectification. The electronic switches (MOSFETs) substitute for passive diodes, enabling controlled switching that dramatically improves conversion efficiency while keeping the overall circuit topology relatively simple and manageable
3Loss of energy
If voltage doubling rectifying circuitry is used to obtain higher DC voltage output, then conversion efficiency is improved to about 75%, but device complexity increases due to multi-staged circuit requirements
Solution Approach 1:
The patent merges the voltage doubling function with the full-wave rectification function into a single integrated circuit stage. By combining these functions, the circuit achieves both voltage doubling (improving efficiency to ~75%) and full-wave rectification without requiring separate multi-staged circuits, thus reducing overall complexity
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 solution achieves a high conversion efficiency while maintaining a relatively simple circuit structure, suitable for wireless charging applications in portable devices by enhancing DC voltage and reducing power conversion loss.
Implementation Method 1
A rectifier is used for converting AC power to DC power
Implementation Method 2
a first capacitor, connected between the second end of the AC power source and a negative end of the first diode
Data Source
AI summary
The invention includes two parallel paths. A first path is composed of two contact ends of a first electronic switch and a first, third and fifth diodes, which connect in series. One contact end connects a first end of an AC source, and a control end connects a second end of the AC source. A second path is composed of two contact ends of a second electronic switch and a second, fourth and sixth diodes, which connect in series. One contact end connects the second end of the AC source, and a control end connects the first end of the AC source. The AC source is connected between the positive ends of the first and second diodes. The second end of the AC source separately connects negative ends of the first and third diodes through two capacitors. The first end of the AC source separately connects negative ends of the second and fourth diodes through another two capacitors. Negative ends of the fifth and sixth diodes connect together to form a voltage output end.