Wireless Charger Overvoltage Feedback Control
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Solution Overview
Problem
Contact-less charging methods for batteries face issues with overvoltage damage and restrictive positioning requirements between the charger and battery, leading to user inconvenience and potential circuit damage.
Innovation Solution
A contact-less chargeable battery and charging device system utilizing electromagnetic induction with an overvoltage monitoring unit that wirelessly communicates to adjust the charging power, preventing overvoltage through feedback control and allowing flexible positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact-less charging is implemented using electromagnetic induction, then the reliability of the battery charging system is improved by eliminating contact terminal contamination and corrosion, but overvoltage damage may occur to the constant voltage/constant current supplier
Solution Approach 1:
The patent implements a feedback control mechanism where the charging device monitors the voltage output to the battery and automatically adjusts the charging power. When overvoltage is detected, the system reduces or stops power transmission, preventing damage to the constant voltage/constant current supplier while maintaining reliable contact-less charging operation
Solution Approach 2:
The system dynamically changes the charging parameters (voltage and current levels) based on real-time monitoring of the battery state and magnetic coupling conditions. By adjusting these parameters in response to changing conditions, the system prevents overvoltage damage while maintaining efficient charging
2Productivity
If the intensity of high frequency AC current induced to the secondary coil is increased to improve charging speed, then the productivity of battery charging is improved, but overvoltage is applied to both ends of the constant voltage/constant current supplier
Solution Approach 1:
The feedback control system continuously monitors the voltage across the constant voltage/constant current supplier and adjusts the primary coil excitation accordingly. When high charging current is needed, the system increases power transmission while maintaining voltage within safe limits through real-time feedback adjustment
Solution Approach 2:
The charging system dynamically adjusts its operating parameters based on real-time conditions. The magnetic coupling between coils and battery state are continuously monitored, and the charging power is dynamically optimized to achieve high charging speed without exceeding voltage ratings of circuit components
3Manufacturing precision
If precise positioning between the primary coil and secondary coil is required to control magnetic flux intensity, then the manufacturing precision of the charging system is improved, but the ease of operation is worsened due to user inconvenience
Solution Approach 1:
The system performs self-adjustment of the magnetic coupling through feedback control. The charging device automatically monitors the induced current in the secondary coil and adjusts the primary coil excitation to maintain optimal coupling, eliminating the need for users to manually position coils with high precision
Solution Approach 2:
The system compensates for positioning variations by dynamically changing the excitation parameters of the primary coil. Even when coil positions vary within a reasonable range, the feedback control adjusts voltage and current parameters to maintain stable and efficient charging, making the system user-friendly
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
Prevents damage to the battery circuit and eliminates the need for precise positioning between the charger and battery, enhancing user convenience by dynamically adjusting charging power in real-time to manage overvoltage states.
Implementation Method 1
a primary coil 40 supplied with the high frequency AC current from the high frequency power driving means 30 to form a magnetic field M... a secondary coil 70 to which a high frequency AC current is induced according to the linkage of the magnetic field M generated in the primary coil 40
Data Source
AI summary
The present invention relates to a wireless charger for a mobile communication terminal, which allows charging a plurality of batteries in a conveniently way without any terminal connection of the batteries to chargers for various mobile communication terminals such as a cellular phone and PDA and also allows intercepting electromagnetic waves while the charger is used, by means of Faraday's law.The wireless charger of the present invention includes a charger body having an electromagnetic wave intercepting means; a charging pad received in the charger body; and at least one battery that is to be charged by means of induced electromotive force generated by the charging pad, wherein the charger body includes a power supply means, a housing having a receiver for receiving the charging pad and connected to the power supply means, and a cover hinged to the housing.