Bridgeless Rectifier Switching Synchronization in EV Wireless Power Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In electric vehicle (EV) wireless power transfer (WPT) systems, synchronized operations between the transmission-side and reception-side are necessary to maintain resonance frequency and impedance control, but existing methods require significant information exchange, leading to inefficiencies and potential system malfunctions due to communication delays and noise.
Innovation Solution
A method and apparatus for performing switching synchronization of a bridgeless rectifier in an EV WPT system, where the EV control module receives input voltage from the transmission-side, calculates phase differences, and controls switching times to minimize information exchange, allowing independent operation of the reception-side resonance circuit and rectifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronized operations are performed through mutual information exchange between transmission-side and reception-side, then resonance frequency and impedance control are maintained, but communication delays and noise cause system malfunction and efficiency degradation
Solution Approach 1:
The reception-side controller independently determines switching time points by calculating phase difference between input voltage and output current without requiring synchronization signals from the transmission-side. The system serves itself by using locally available electrical parameters to achieve switching synchronization, eliminating communication dependencies and their associated delays and noise issues.
2Reliability
If information exchange is performed between transmission-side and reception-side for switching synchronization, then synchronized operation is achieved, but operation speed is reduced and circuit volume increases
Solution Approach 1:
The reception-side controller autonomously calculates the phase difference using locally measured input voltage and output current, then directly determines switching time points without waiting for transmission-side synchronization signals. This self-service approach eliminates communication delay overhead and accelerates the synchronization process.
3Reliability
If bridgeless rectifier switching is controlled through transmission-side information exchange, then synchronized operation is achieved, but circuit complexity and cost increase
Solution Approach 1:
The reception-side controller uses its own controller to perform all switching synchronization functions by calculating phase difference between input voltage and output current. This eliminates the need for separate synchronization signal generation and transmission circuits, reducing overall system complexity while maintaining reliable switching synchronization.
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 reduces the need for synchronization signals, prevents operation speed reductions, minimizes circuit volume, and lowers costs by enabling independent control of the bridgeless rectifier at the reception-side without information exchange, thus enhancing the efficiency and reliability of the WPT system.
Implementation Method 1
a reception coil in a vehicle assembly (VA) mounted in the EV forms an inductive resonant coupling with a transmission coil in a group assembly (GA) located in a charging station or a charging spot. Electric power is then transferred from the GA to the VA to charge the high-voltage battery of the EV through the inductive resonant coupling.
Implementation Method 2
the bridgeless rectifier may be configured to rectify an output of the reception-side resonance circuit and to output the rectified output
Data Source
AI summary
A method for performing switching synchronization of a bridgeless rectifier in an electric vehicle (EV) wireless power transfer system may include receiving, by an EV control module, an input voltage of a transmission-side resonance circuit from a transmission-side of the EV wireless power transfer system; calculating, by the EV control module, a phase difference between the received input voltage and a voltage or a current selected in the bridgeless rectifier and a reception-side resonance circuit; and controlling, by an EV control module, switching time points of switches included in the bridgeless rectifier to decrease the calculated phase difference. The reception-side resonance circuit may be electromagnetically coupled to the transmission-side resonance circuit, and the bridgeless rectifier may be configured to rectify an output of the reception-side resonance circuit and to output the rectified output.