DWPT Receiver Coil Integration for Stable EV Charging Voltage
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Solution Overview
Problem
Dynamic wireless power transfer (DWPT) systems face challenges with voltage fluctuations and efficiency issues, particularly in segmented coil array methods, which affect battery lifespan and system efficiency.
Innovation Solution
Integrate a secondary compensation network inductor with the receiver coil, using an LCC-CLC compensation network topology where the inductor is coupled with transmitter coils, ensuring stable mutual coupling and minimizing voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a segmented coil array method is used for DWPT, then the electromagnetic interference and efficiency issues are improved, but voltage fluctuations occur as the vehicle passes over different transmitter coils
Solution Approach 1:
A compensation inductor is introduced as an intermediary element between the receiver coil and the load. This compensation inductor creates an additional mutual coupling path with the transmitter coils, which acts as a mediator to smooth out voltage fluctuations. The compensation inductor's induced voltage compensates for the voltage drops that occur when transitioning between transmitter coils, thereby maintaining stable output voltage while preserving the efficiency benefits of segmented coil arrays.
Solution Approach 2:
The system changes the electrical parameters by introducing a compensation inductor with specific inductance value and positioning it at an optimized distance from the receiver coil. This parameter change creates a controlled additional mutual coupling effect that counteracts the voltage fluctuations. By adjusting the inductance value and position of the compensation inductor, the system optimizes the voltage stability without sacrificing power transfer efficiency.
2Productivity
If a long-track transmitter is used for DWPT, then multiple vehicles can be charged simultaneously over longer distance, but the system experiences low efficiency and high electromagnetic interference
Solution Approach 1:
The long-track transmitter is divided into multiple segmented transmitter coils rather than using a single continuous track. Each segment operates independently with optimized dimensions and spacing. This segmentation reduces electromagnetic interference between adjacent sections and improves power transfer efficiency for each individual coil, while still maintaining the capability to charge multiple vehicles simultaneously across the extended track length.
3Stability of the object's composition
If additional components are added to compensate for voltage fluctuations, then output voltage stability is improved, but device complexity increases
Solution Approach 1:
The compensation inductor is integrated with the existing receiver coil structure rather than being a completely separate component. The inductor is positioned in close proximity to the receiver coil and shares the same mounting structure and magnetic coupling path. This merging approach provides voltage stabilization functionality while minimizing additional components, reducing structural complexity, and maintaining a compact 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
Achieves a stable output voltage fluctuation rate of +/â4% or less, enhancing power transfer efficiency and reducing the need for additional components or control systems.
Implementation Method 1
a transmitter side configured to wirelessly transmit power to a receiver coil during dynamic wireless power transfer
Implementation Method 2
a receiver side configured to wirelessly receive power from the transmitter side during dynamic wireless power transfer
Implementation Method 3
The compensation inductor can have a same inductance value as the receiver coil... The transmitter coils and the receiver coil can have a first mutual inductance during DWPT, and the transmitter coils and the compensation inductor can have a second mutual inductance during DWPT
Data Source
AI summary
Systems and methods for dynamic wireless power transfer (DWPT) are provided (e.g., DWPT of electric vehicles (EVs)). The inductor of the secondary compensation network can be integrated with the main inductive coil, which can introduce mutual couplings (e.g., three mutual couplings) in the system. The additional mutual coupling leads to a smooth power profile and an increase in power (e.g., power transferred during dynamic charging). The secondary compensation network inductor coil and the secondary main coil can be designed, configured, and/or arranged in a way that mutual coupling between them and the transmitter coils produces a uniform power profile.