Wireless Power Converter Control With Coupled Reactors
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Solution Overview
Problem
Current power transmission systems for electric vehicles face inefficiencies in power conversion, particularly in non-contact power transmission, which affects the overall efficiency and output during vehicle travel.
Innovation Solution
A power control device incorporating a power receiving device, a power converting device with magnetically coupled reactors and switching elements, and a control device that optimizes the duty ratio based on voltage at an optimal operating point to maintain efficient power conversion and constant load resistance, enhancing power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a step-up converter, step-down converter, or bidirectional converter is used for power conversion, then power transmission can be achieved, but power conversion efficiency is insufficient
Solution Approach 1:
The patent employs a bidirectional converter that can dynamically switch between step-up and step-down conversion modes based on the required power transmission conditions. This dynamic adaptability allows the system to optimize conversion efficiency across different operating scenarios, resolving the contradiction between maintaining power transmission capability and improving overall conversion efficiency.
Solution Approach 2:
The control device adjusts conversion parameters including duty ratio, switching frequency, and load resistance value based on real-time operating conditions. By dynamically changing these parameters, the system maximizes power conversion efficiency while maintaining effective power transmission, thereby resolving the efficiency contradiction.
2Productivity
If load resistance value is not optimized, then power transmission can proceed, but power transmission efficiency decreases
Solution Approach 1:
The control device implements feedback control by continuously monitoring the load resistance value and adjusting the duty ratio and switching frequency accordingly. This closed-loop control ensures the system operates at optimal efficiency points, maximizing power transmission efficiency while minimizing energy loss through real-time parameter optimization.
3Adaptability or versatility
If output changes during vehicle travel, then power delivery adapts, but load resistance value fluctuates causing efficiency decrease
Solution Approach 1:
The bidirectional converter dynamically adjusts its operation mode and control parameters in response to output changes during vehicle travel. By continuously adapting the duty ratio and switching frequency based on real-time load conditions, the system maintains optimal load resistance values even as output requirements change, preventing efficiency degradation while preserving full adaptability.
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 solution enables high-efficiency power conversion and maximizes power transmission efficiency in a non-contact manner, maintaining efficiency regardless of output changes during vehicle travel by optimizing the load resistance value based on the optimal operating point.
Implementation Method 1
an element module including at least two switching elements and at least a pair of reactors that are magnetically coupled
Data Source
AI summary
A power control device includes a power receiving device, a second power converting device, and a control device. The power receiving device receives electric power transmitted from a power transmitting device in a non-contact manner and outputs DC electric power. The second power converting device includes an element module including transistors forming a pair in two phases and a pair of reactors that are magnetically coupled. The second power converting device outputs arbitrary DC electric power by converting the DC electric power output from the power receiving device. The control device controls a switching operation of the element module according to a duty ratio based on a second voltage at an optimal operating point of the DC electric power input from the power receiving device to the second power converting device and a first voltage of the DC electric power output from the second power converting device.