Power Flow Controller Synchronization for Wireless Power Transfer
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Solution Overview
Problem
Wireless power transfer systems face challenges in efficiently handling variations in operating parameters, leading to increased stress on transmitter components and reduced system efficiency due to changes in relative position and resonant frequencies between transmitting and receiving units during charging operations.
Innovation Solution
A power flow controller synchronization method is implemented, which includes a controller that detects signals in the power receiving element, determines synchronization points such as zero voltage crossing points, and activates a power flow controller to synchronize with the operating frequency, reducing ripple current and stress on transmitter components by adjusting the duty cycle based on inductance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the circuit is over designed to accommodate changes in operating parameters, then the components are robust enough to handle variations, but the unit cost increases
Solution Approach 1:
The patent implements a power flow controller with dynamic switching capability that adapts to changing operating parameters in real-time. The controller adjusts the duty cycle of switching elements to maintain optimal performance despite variations in resonant frequency and relative position, eliminating the need for static over-design of circuit components.
Solution Approach 2:
The system changes operating parameters dynamically by adjusting the switching frequency and duty cycle of the power flow controller. This allows the circuit to adapt to varying load conditions and resonant frequencies without requiring components to be designed for worst-case scenarios, thereby reducing component specifications and cost.
2Adaptability or versatility
If the transmitter components are designed to handle stress from parameter variations, then the system can accommodate changes, but the device complexity increases
Solution Approach 1:
The patent employs a feedback control mechanism where the controller monitors operating parameters and adjusts the power flow controller accordingly. This closed-loop control enables the system to handle parameter variations through intelligent control rather than through complex hardware design, simplifying the overall device architecture.
Solution Approach 2:
The power flow controller acts as an intermediary between the transmitter and receiver, managing the effects of parameter variations. By introducing this control layer, the system handles adaptability requirements through software/control logic rather than through complex hardware modifications in the transmitter.
3Adaptability or versatility
If wireless power transfer operates in dynamic environments with position changes, then flexibility is improved, but system efficiency decreases due to stress on components
Solution Approach 1:
The patent utilizes periodic switching action in the power flow controller to efficiently transfer power. By employing pulse-width modulation with periodic switching, the system maintains high efficiency while adapting to dynamic conditions, avoiding continuous operation at reduced efficiency points.
Solution Approach 2:
The system dynamically changes operating parameters including switching frequency and duty cycle to optimize efficiency under varying load and position conditions. This parameter adaptation allows the system to maintain peak efficiency across different operating scenarios rather than operating at a compromised fixed point.
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 the operational stability of the receiver, reduces stress on transmitter components, and increases the efficiency of wireless power transfer by allowing the transmitter inverter to operate under more favorable conditions, enabling more cost-effective and efficient power transfer.
Implementation Method 1
The power receiving element may receive power via an inductive coupling with a transmitter
Data Source
AI summary
Techniques for wireless power transfer are disclosed. An example of an apparatus for receiving power in a wireless power transfer system includes a power receiving element, a tuning and current doubler circuit operably coupled to the power receiving element, a power flow controller circuit operably coupled to the tuning and current doubler circuit, and a controller operable coupled to the power receiving element and the power flow controller circuit and configured to detect a signal in the power receiving element and to synchronize the power flow controller circuit based on the signal.