Wireless Charging H-Bridge Switching for Wide Voltage Range
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Solution Overview
Problem
Existing wireless charging systems face challenges in efficiently transferring power to vehicles with varying battery voltages due to energy loss from frequent switching of power electronics, particularly in H bridge circuits, and they are not effectively addressing misaligned parking and varying conditions.
Innovation Solution
A switch control circuit controls H bridge circuits to toggle specific switches between two configurations, maintaining one half bridge in a constant state while the other half bridge switches, reducing voltage swings and energy loss across the resonant tank, allowing charging across a wide voltage range from 200 V to 1000 V.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If H bridge circuits frequently switch between multiple configurations to accommodate varying battery voltages, then adaptability to different voltage ranges is improved, but energy loss increases due to frequent switching of power electronics
Solution Approach 1:
The H bridge circuit is segmented into two independent half bridges, where each half bridge can be controlled separately. This allows the system to toggle between configurations by switching only one half bridge while keeping the other constant, reducing the frequency and complexity of switching operations while maintaining voltage range adaptability from 200V to 1000V
Solution Approach 2:
The switching circuit periodically toggles between two specific configurations (first and second switch configurations) rather than frequently switching among multiple configurations. This periodic toggling between limited states reduces switching losses while still accommodating varying battery voltages through controlled transitions
2Adaptability or versatility
If switching circuit toggles between multiple configurations (first, second, and third), then voltage adaptability is improved, but voltage swings across resonant tank increase causing more transient effects
Solution Approach 1:
The patent extracts and eliminates the third switch configuration from the switching sequence, leaving only two configurations (first and second). By removing the intermediate third configuration, the system reduces unnecessary voltage swings across the resonant tank while maintaining adequate voltage adaptability through the remaining two configurations
Solution Approach 2:
The switching pattern uses asymmetric control where one half bridge switches between configurations while the other half bridge remains constant. This asymmetric switching approach reduces overall voltage swings compared to symmetric multi-configuration toggling, stabilizing the resonant tank voltage while maintaining 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 approach reduces energy loss and maintains stable voltage swings, enabling efficient wireless charging across a wide voltage range with reduced transient effects and cost-effective hardware requirements.
Implementation Method 1
Inductive charging uses electromagnetic induction to generate, or otherwise provide, electricity to devices without necessarily requiring physical electrical connectivity
Data Source
AI summary
A method of wireless power transfer can include energizing a first wireless charging pad that includes a switching circuit, repeatedly toggling the switching circuit between a first switch configuration and a second switch configuration, and causing wireless power transfer from the first wireless charging pad to a second wireless charging pad using a voltage generated from the repeatedly toggling. During the repeatedly toggling, switches of a first half bridge of the switching circuit change a state between the first switch configuration and the second switch configuration, and switches of a second half bridge of the switching circuit remain in a same state for the first switch configuration and the second switch configuration. In certain embodiments, the first wireless charging pad can be a ground pad and the second wireless charging pad can be a vehicle pad of a vehicle. Other methods and related wireless charging pads are disclosed.