Wireless Power Converter Topology for Stable Zero-Voltage Switching
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Solution Overview
Problem
Existing wireless electrical power supply apparatuses face challenges in stability of transmission characteristics due to variations in circuit constants, leading to issues in mass production and compatibility, and are often costly and large in size.
Innovation Solution
A wireless electrical power supply apparatus is designed with single-switch converters and zero-voltage switching operations, along with a voltage control circuit to manage voltage differences and compensate for power fluctuations, reducing cost and size while enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If bridge circuits with multiple power semiconductors are used for wireless power transmission, then power transmission capability is improved, but device cost and size increase
Solution Approach 1:
The patent divides the wireless power transmission system into separate transmitter and receiver sides, each using simple single-switch converters instead of complex bridge circuits. The transmitter includes a switching device and resonant capacitor, while the receiver includes a rectifying device and resonant capacitor, achieving power transmission without requiring multiple power semiconductors per side.
Solution Approach 2:
The patent replaces expensive bridge circuit configurations with simpler single-switch converter topologies that use fewer and less costly power semiconductor devices. This substitution maintains functional capability while significantly reducing device cost and complexity.
2Reliability
If bridge circuits are used on both transmitter and receiver sides, then power transmission stability is improved, but control complexity increases
Solution Approach 1:
The patent extracts the complex control requirements from both sides by simplifying each side to a single-switch converter configuration. This allows the transmitter and receiver to operate with independent, simple control logic rather than requiring coordinated control of multiple switches on each side.
Solution Approach 2:
The resonant circuit configuration enables the system to self-regulate power transmission through natural resonance between the transmitter and receiver resonant capacitors. This self-organizing behavior reduces the need for complex external control mechanisms while maintaining transmission stability.
3Device complexity
If single-switch converters are used for wireless power supply, then cost and size are reduced, but transmission power fluctuates due to circuit constant variations
Solution Approach 1:
The patent introduces dynamic control mechanisms that adjust operating parameters in real-time to compensate for circuit constant variations. The control circuits monitor transmission conditions and dynamically adjust switching frequencies and duty cycles to maintain stable power transmission despite manufacturing tolerances and environmental changes.
Solution Approach 2:
The patent implements feedback control where the receiver detects power reception conditions and communicates back to the transmitter, which then adjusts its output to maintain stable transmission. This closed-loop control compensates for variations in circuit constants caused by mass production tolerances.
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 stable transmission characteristics, reduces costs, and minimizes size, addressing the issues of circuit constant variations and compatibility, thereby improving the apparatus's performance and manufacturability.
Implementation Method 1
The wireless electrical power supply apparatus performs power transmission utilizing magnetic coupling between coils
Implementation Method 2
a first resonant capacitor connected in parallel to either the first transmission coil or the first switching device, or both; a second resonant capacitor connected in parallel to either the second transmission coil or the second switching device, or both
Data Source
AI summary
A wireless electrical power supply apparatus 100 includes a first electrical power supply unit 101, a second electrical power supply unit 104, voltage control circuits 113 and 123 configured to control a first voltage difference between a first input voltage E1 and a first output voltage E2 during forward power transmission and a second voltage difference between a second input voltage E2 and a second output voltage E1 during reverse power transmission, a second switching control circuit 121, 122 configured to turn off a second transistor Q2 during the forward power transmission and thereby cause a second diode D2 to perform rectification, and a first switching control circuit 111, 112 configured to turn off a first transistor Q1 during the reverse power transmission and thereby cause a first diode D1 to perform rectification.