Wireless Charging Battery With Overvoltage Reception Protection
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Solution Overview
Problem
Existing contactless chargeable secondary batteries face challenges in efficiently receiving power wirelessly, especially when attached to electronic devices, due to variations in distance, positional displacement, tilt, and external magnetic field strength, which can lead to insufficient or excessive power reception, potentially damaging electronic components.
Innovation Solution
A universal-outer-shape wirelessly chargeable battery with a secondary battery and a wireless charging circuit, including a power receiving coil, rectifier circuit, voltage conversion circuits, and a power reception protecting circuit, that allows for charging and voltage output within a predetermined external electromagnetic or magnetic field range, while protecting electronic components from excessive power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power receiving coil receives electromagnetic field from power transmission device, then wireless charging is enabled, but induced voltage and induced current may become too large when external magnetic field exceeds predetermined value
Solution Approach 1:
The control circuit continuously monitors the received voltage from the power receiving coil and compares it against a predetermined threshold value. When the received voltage exceeds the threshold, the control circuit automatically interrupts the power reception, creating a closed-loop feedback control system that prevents overvoltage damage to electronic components.
Solution Approach 2:
The control circuit acts as an intermediary between the power receiving coil and the electronic components. It receives the voltage signal from the power receiving coil, processes it through comparison with the threshold value, and controls the power reception interruption, thereby protecting downstream electronic components from excessive voltage.
2Productivity
If the battery is designed for dedicated charging device, then charging efficiency is improved, but versatility to attach to electronic devices is reduced
Solution Approach 1:
The battery is designed with a universal outer shape that allows it to function both as a standalone chargeable battery and as an attachable power source for electronic devices. The standardized dimensions and terminal configurations enable compatibility with multiple device types while maintaining wireless charging capability through the power receiving coil.
3Productivity
If the power receiving coil is positioned for optimal wireless charging, then charging performance is improved, but performance varies when attached to different electronic devices due to distance and positional displacement
Solution Approach 1:
The control circuit dynamically adjusts the power reception state based on the magnitude of received voltage, which varies with distance and positional relationship between the power receiving coil and power transmitting coil. By monitoring voltage parameters and interrupting reception when thresholds are exceeded, the system adapts to different attachment conditions while maintaining safe operation.
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
The solution enables practical, versatile, and secure wireless charging of secondary batteries, allowing them to function as power sources for electronic devices, while preventing damage from excessive power reception and reducing power loss in wiring.
Implementation Method 1
a power receiving coil that receives an electromagnetic field or a magnetic field having a predetermined size caused by power transmission from an outside
Data Source
AI summary
A secondary battery, a wireless charging circuit connected to the secondary battery, an outer casing member that has an outer shape equivalent to an outer shape of a universal battery and accommodates the secondary battery and the wireless changing circuit, and a positive terminal and a negative terminal that are electrically connected to the secondary battery and are provided at positions corresponding to positions of a positive terminal and a negative terminal, respectively, of the universal battery, are provided. The wireless charging circuit includes a power reception protecting circuit that stops power reception at a rectifier circuit in a case where a received voltage exceeds a predetermined voltage range.