Wireless Charging Phase Control for Capacitor Overvoltage
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Solution Overview
Problem
Existing non-contact charging systems face challenges in promptly stopping charging during abnormal conditions due to communication delays, which can lead to overvoltage issues and potential failures.
Innovation Solution
A non-contact charging control device that includes a transformer, a rectifier circuit, a smoothing capacitor, a voltage sensor, and a controller. The controller reduces the voltage phase difference between the transformers when an overvoltage is detected, allowing for immediate stopping of charging without relying on wireless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication is used to stop charging during abnormal conditions, then charging can be stopped remotely, but communication delays cause overvoltage issues and potential failures
Solution Approach 1:
The patent introduces a local control unit at the power receiving device that acts as an intermediary between the voltage sensor and the charging control system. This local controller can immediately detect overvoltage conditions and stop charging without waiting for wireless communication, eliminating communication delays while maintaining system coordination through the wireless link.
Solution Approach 2:
The system performs preliminary setup by placing a local control unit and voltage sensor directly at the power receiving device, enabling immediate detection and response to overvoltage conditions before communication delays can occur. This preliminary positioning of control components ensures rapid response capability.
2Speed
If a local control system is added to enable immediate charging stop, then response time is reduced, but device complexity increases
Solution Approach 1:
The power receiving device is equipped with self-service capability through a local control unit that can autonomously detect overvoltage conditions via the voltage sensor and immediately stop charging without external intervention. This self-service mechanism reduces response time while keeping the control logic simple and localized.
Solution Approach 2:
The control system is segmented into independent functional modules: a voltage sensor for detection, a local control unit for immediate response, and a wireless communication interface for coordination. This segmentation allows the critical response function to operate independently and rapidly while maintaining overall system integration.
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 timely and reliable stopping of charging during abnormal conditions, preventing overvoltage issues and ensuring safe and efficient operation.
Implementation Method 1
a transformer of a power receiving side for receiving an AC power having a transmission frequency transmitted from a transformer of a power transmission side in a non-contact manner
Implementation Method 2
a rectifier circuit for converting the AC power received by the transformer of the power receiving side into DC power
Data Source
AI summary
A non-contact charging control device for controlling a power receiving device capable of non-contact charging to charge a battery by non-contact receiving power from a power transmission device, includes: a transformer of a power receiving side for receiving an AC power having a transmission frequency transmitted from a transformer of a power transmission side; a rectifier circuit for converting the AC power received by the transformer of the power receiving side into DC power and outputting the DC power to the battery; a smoothing capacitor, provided between the rectifier circuit and the battery, for smoothing a current from the rectifier circuit; a voltage sensor for detecting a voltage of the smoothing capacitor; and a controller, when an overvoltage of the smoothing capacitor is detected, reduces a voltage phase difference between the transformer of the power transmission side and the transformer of the power receiving side.