Inductive Power Transfer System for Wireless EV Charging
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Solution Overview
Problem
Conventional electric vehicles face limitations such as limited range, inconvenient charging, and rapid battery degradation, which hinder their widespread acceptance as a viable transportation option, particularly due to the need for slow charging and the inconvenience of manual cable connection for charging.
Innovation Solution
An Inductive Power Transfer (IPT) system that includes a coil with multiple turns of conductor, ferromagnetic slabs, and a shield member to channel electromagnetic flux, allowing for both high and low power charging options through inductive coupling, eliminating the need for manual cable connection and enabling flexible charging scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional cable-based charging is used, then reliable power transfer is achieved, but manual connection and limited accessibility are required
Solution Approach 1:
The patent replaces the mechanical cable connection system with an electromagnetic field-based inductive power transfer system. The charging pad generates an electromagnetic field that inductively couples with a receiver in the vehicle, eliminating the need for physical cable plugging and unplugging. This substitution of mechanical connection with electromagnetic induction directly resolves the contradiction by improving ease of operation while maintaining reliable power transfer.
Solution Approach 2:
The patent introduces an electromagnetic field as an intermediary between the power source and the battery. The charging pad creates an electromagnetic field that acts as a mediator to transfer energy wirelessly to the vehicle's receiver, which then delivers power to the battery. This intermediary approach eliminates direct mechanical contact while ensuring reliable power transfer, resolving the contradiction between charging convenience and connection reliability.
2Loss of time
If high power charging is used, then charging time is reduced, but battery degradation increases
Solution Approach 1:
The patent implements a dynamic charging system where the power transfer rate can be adjusted based on real-time conditions. The system can operate at high power levels when the battery can accept rapid charging, and switch to lower power levels when the battery is near full charge or when thermal management is needed. This dynamic adjustment allows the system to minimize charging time while preventing excessive stress on the battery, thereby resolving the contradiction between charging speed and battery longevity.
Solution Approach 2:
The patent changes the operating parameters of the charging system based on battery state. By monitoring battery charge level, temperature, and acceptance rate, the system dynamically adjusts power transfer parameters to optimize both charging speed and battery health. This parameter adaptation enables high power charging when beneficial while preventing degradation, resolving the time-loss versus reliability contradiction.
3Ease of operation
If inductive power transfer is used, then manual cable connection is eliminated, but electromagnetic flux management becomes complex
Solution Approach 1:
The patent extracts and separates the electromagnetic flux management function into dedicated components. The charging pad incorporates specific magnetic shielding and flux-conducting materials that are specifically designed to contain and direct the electromagnetic field. By extracting this complex function into specialized components rather than attempting to manage it with simple structures, the system achieves wireless charging convenience while containing the electromagnetic complexity within dedicated elements.
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 IPT system enhances charging efficiency and convenience by allowing rapid charging with high power transfer rates and flexible charging options, reducing battery degradation and maintaining vehicle readiness, while also integrating with renewable energy sources to stabilize electricity networks.
Implementation Method 1
An Inductive Power Transfer (IPT) system that includes a coil with multiple turns of conductor
Implementation Method 2
ferromagnetic slabs, and a shield member to channel electromagnetic flux
Implementation Method 3
a shield member to channel electromagnetic flux
Data Source
AI summary
A method of charging a battery includes coupling an electricity network or subnetwork to the battery using inductive power transfer, transferring electrical energy to the battery from the electricity network or subnetwork and varying the inductive power transfer using a controller of the electricity network or subnetwork according to at least one predetermined criteria of the electricity network or subnetwork.