Wireless Power Transfer System with Dynamic Control
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Solution Overview
Problem
Current wireless power transfer technologies face challenges in achieving high efficiency at low cost, particularly in mobile applications, due to limitations in power efficiency, magnetic emission, and system cost, with stringent size and thermal constraints, and power losses in critical components.
Innovation Solution
The implementation of a system with a power control block that adjusts frequency, output voltage, and current in coordination, using a resonator with a resonant capacitor and coil, and a ratio-controllable power converter, along with a switch-capacitor network and controller to optimize power transfer and reduce losses, allowing operation in multiple frequency bands and configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power transfer is implemented to improve customer experience and tolerance to harsh environment, then convenience and reliability are improved, but power efficiency deteriorates due to power losses in transmitter power amplifier and system
Solution Approach 1:
The patent implements dynamic control of the resonant frequency and impedance matching parameters in real-time to optimize power transfer efficiency. The system adjusts operating parameters dynamically based on load conditions and coupling coefficients, transforming the static power transfer system into a dynamic one that adapts to changing conditions, thereby improving efficiency while maintaining wireless convenience.
Solution Approach 2:
The patent changes key operating parameters such as resonant frequency, impedance values, and power amplifier settings to optimize the balance between power transfer efficiency and wireless operation. By adjusting these parameters based on system conditions, the patent achieves improved power efficiency without sacrificing the convenience of wireless power transfer.
2Power
If higher power wireless charging is implemented to meet mobile application requirements, then power output is improved, but thermal budget and system temperature increase
Solution Approach 1:
The patent employs periodic switching operations in the power converter and resonant circuit to transfer power in controlled pulses rather than continuous operation. This periodic action allows for thermal management by creating intervals between power transfer cycles, enabling heat dissipation while maintaining high average power output for mobile applications.
Solution Approach 2:
The patent maintains continuous power transfer through resonant coupling while managing thermal effects. By operating in the resonant frequency band, the system achieves continuous useful power transfer with reduced losses compared to non-resonant methods, thereby delivering high power without proportional increases in thermal budget.
3Loss of energy
If system efficiency is improved to reduce power losses, then energy efficiency is improved, but system cost increases due to advanced components and control circuits
Solution Approach 1:
The patent designs the power converter and control circuit to perform multiple functions simultaneously: power conversion, impedance matching, frequency regulation, and efficiency optimization. By making these components multi-functional rather than having separate dedicated circuits for each function, the patent improves system efficiency while controlling the increase in device complexity and cost.
Solution Approach 2:
The patent implements self-adjusting control mechanisms where the system automatically optimizes its own operating parameters for maximum efficiency without requiring complex external control systems. The controller autonomously adjusts resonant frequency and impedance matching based on real-time system conditions, achieving high efficiency while minimizing the complexity of control circuitry.
4Loss of energy
If resonant frequency and impedance are optimized to improve power transfer efficiency, then power efficiency is improved, but magnetic emission increases
Solution Approach 1:
The patent employs composite resonant structures and shielding materials that combine different material properties to achieve both high power transfer efficiency and reduced magnetic emission. The resonant circuit uses composite designs that confine magnetic fields more effectively while maintaining efficient energy transfer, thereby resolving the contradiction between efficiency and magnetic emission.
Solution Approach 2:
The patent converts the potentially harmful magnetic emission into a beneficial effect by operating in the resonant frequency band where magnetic coupling is maximized for power transfer. The same resonant magnetic fields that could be considered harmful emissions are actually utilized constructively for efficient wireless power transfer, transforming the harmful factor into a beneficial mechanism.
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 enhances system performance by improving power efficiency, reducing magnetic emission, and optimizing power transfer, enabling higher power wireless charging while maintaining low system losses and cost-effectiveness.
Implementation Method 1
the first coil and the second coil are magnetically coupled
Implementation Method 2
a first resonator which has a first resonant capacitor and a first coil
Data Source
AI summary
A system includes a first device, a second device, and a power control block. The first device has a first power converter and a first resonator which has a first resonant capacitor and a first coil. The second device has a second power converter and a second resonator which has a second resonant capacitor and a second coil. The second power converter is coupled to a ratio-controllable power converter, and the first coil and the second coil are magnetically coupled. The power control block is configured to adjust the system frequency, the second power converter output voltage and the current in the first coil in coordination.