Wireless Charging Coil Voltage Protection Circuit
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Solution Overview
Problem
Portable electronic devices with noncontact power transmission coils are vulnerable to damage from strong magnetic fields generated by induction heating cookers, which can produce high voltages that exceed the device's resistance, leading to potential circuit destruction.
Innovation Solution
An electronic device with a loop-shaped electric conductor for electromagnetic induction, incorporating a voltage-detecting unit, voltage-comparing unit, and separating unit to detect and respond to abnormally high voltages by breaking the electrical connection between the conductor and the electronic circuit, thereby protecting internal circuits without the need for expensive high-resistance voltage parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a noncontact power transmission coil is used for wireless charging, then convenience and modern functionality are improved, but the device becomes vulnerable to damage from strong magnetic fields generated by induction heating cookers
Solution Approach 1:
The voltage detection and comparison circuits are activated before the high voltage from induction heating can damage the electronic circuits. The separating unit is prepared to break the connection immediately when abnormal voltage is detected, preventing the harmful effect from occurring in the first place
Solution Approach 2:
The voltage detection unit, voltage comparison unit, and separating unit act as intermediary protective mechanisms between the power transmission coil and the electronic circuits. These intermediary components detect abnormal conditions and interrupt the connection before the strong magnetic field effects can reach and damage the vulnerable electronic circuits
2Reliability
If high-resistance voltage parts are used to protect against strong magnetic fields, then circuit protection is improved, but device size and cost increase
Solution Approach 1:
The patent replaces passive mechanical protection (high-resistance voltage parts that physically block voltage) with an active electrical control system. The voltage detection and comparison circuits monitor the electrical conditions and trigger an electronic separating mechanism, substituting bulky passive protective components with compact active control circuits
Solution Approach 2:
The patent changes the protection approach from static high-resistance components to dynamic voltage-based control. By monitoring voltage parameters in real-time and comparing them against threshold values, the system adaptively controls the connection state, replacing fixed protective components with parameter-based control logic
3Reliability
If high-resistance voltage parts are used to protect against strong magnetic fields, then circuit protection is improved, but device cost increases
Solution Approach 1:
The patent replaces expensive passive high-resistance voltage protective parts with relatively inexpensive active control circuits consisting of voltage detection units, comparison units, and separating units. This substitution dramatically reduces component costs while maintaining protection capability
Solution Approach 2:
The patent uses low-cost detection and control components instead of expensive protective parts. The voltage detection unit, comparison unit, and separating unit are implemented using inexpensive standard electronic components, making the protection system economically viable for mass production
4Speed
If the separating unit breaks the electric connection immediately when voltage exceeds reference voltage, then protection speed is improved, but risk of false triggering increases
Solution Approach 1:
The voltage detection unit continuously monitors the voltage across the power transmission coil and provides real-time feedback to the voltage comparison unit. This feedback mechanism allows the system to respond immediately to actual voltage conditions while using the reference voltage threshold to filter out normal operating variations, preventing false triggering
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
Effectively protects internal electronic circuits from high voltage outputs caused by strong magnetic fields or electromagnetic waves, ensuring device safety without using large or costly high-resistance voltage components.
Implementation Method 1
at least a loop-shaped electric conductor generating electric power by electromagnetic induction
Data Source
AI summary
An electronic device having at least a loop-shaped electric conductor generating electric power by electromagnetic induction is provided. The electronic device includes a voltage-detecting unit, a voltage-comparing unit and a separating unit. The voltage-detecting unit is configured to detect a voltage generated in the electric conductor by the electromagnetic induction. The voltage-comparing unit is configured to make a comparison between the voltage detected by the voltage-detecting unit and a predetermined reference voltage and determining whether the voltage detected by the voltage-detecting unit exceeds the predetermined reference voltage. The separating unit is configured to break an electric connection between the electronic conductor and an electronic circuit connecting to the electric conductor when the voltage-comparing unit determines that the voltage detected by the voltage-detecting unit exceeds the predetermined reference voltage.