Bridge Inverter Pulse Control for Wireless Resonance Tracking
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in accurately tracking resonance frequency due to variable impedance caused by factors like measurement accuracy, ambient temperature, and device tolerance, leading to increased reactive power loss and reduced efficiency, particularly in feedback control schemes that require complex algorithms and additional components.
Innovation Solution
A wireless power transmission system utilizing low-frequency pulse control with a bridge inverter and MOSFETs to generate self-oscillation, eliminating the need for negative resistance designs and additional components, allowing for flexible system expansion and reduced cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control scheme is used to track resonance frequency, then resonance tracking capability is improved, but system complexity and cost increase due to complex algorithms and additional components
Solution Approach 1:
The system uses self-oscillation to automatically track resonance frequency without external feedback control. The oscillating circuit generates its own oscillation signal that naturally follows the resonance frequency of the wireless power transmission system, eliminating the need for complex feedback algorithms and additional sensing components.
Solution Approach 2:
The patent extracts the feedback control function by removing it entirely and replacing it with self-oscillation. The oscillating circuit is designed to inherently produce oscillations at the resonance frequency, thereby taking out the complex feedback mechanism while maintaining resonance tracking capability.
2Reliability
If parameter switching control is used, then resonance tracking is achieved, but additional switching devices increase operation losses and reduce tracking accuracy
Solution Approach 1:
The system employs self-oscillation where the oscillating circuit automatically adjusts to track resonance frequency without requiring external parameter switching. This eliminates switching device losses and maintains continuous, accurate resonance tracking through the natural oscillation behavior of the circuit.
3Reliability
If negative resistance design is used for self-oscillation, then robustness and real-time performance are improved, but circuit complexity and cost increase
Solution Approach 1:
Instead of using complex negative resistance circuits, the patent uses a simplified oscillating circuit that copies the essential self-oscillation behavior. The oscillating circuit includes basic components (resistor, capacitor, inductor, and switching element) that together produce the required oscillation without needing complex negative resistance design.
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 efficient resonance tracking with lower costs and improved real-time performance by using self-oscillation, enhancing system flexibility and reducing switching losses.
Implementation Method 1
the transmitting end is configured to generate self-oscillation
Implementation Method 2
the transmitting coil generates an induced magnetic field
Implementation Method 3
the transmitting coil generates an induced magnetic field, and the receiving coil at the receiving end obtains power through a magnetic induction phenomenon
Implementation Method 4
a compensation circuit including a resonance capacitor and a transmitting coil that are connected in series with each other
Data Source
AI summary
The present disclosure belongs to the field of wireless power transmission technology, and specifically relates to a wireless power transmission system for resonance tracking through low-frequency pulse control. The system includes a power supply, a transmitting end, and a receiving end. The transmitting end includes a compensation circuit including a resonance capacitor and a transmitting coil that are connected in series with each other, the receiving end includes a receiving coil. The transmitting end also includes a bridge inverter. The wireless power transmission system completes resonance tracking through low-frequency pulse control of the bridge inverter, and realizes current self-oscillation through pulse charging of voltage. Compared with a conventional negative resistance self-oscillation manner, the present disclosure does not require additional complex negative resistance design and only needs to change an inverter control signal, so it has lower application cost and makes expansion of system function more flexible.