Adaptive Current Limiting Protection Circuit for Handheld Devices
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Solution Overview
Problem
Handheld electronic devices require different charging voltages, leading to complexity in using a single charging device for various devices, as existing charging devices do not adapt to different voltage requirements effectively.
Innovation Solution
A charging device and handheld electronic device with adaptive current limiting protection circuits, comprising a connection interface, charging circuit, impedance unit, switch, and control unit, which measures voltage and current to adjust current flow according to pre-stored limit values, ensuring safe charging across different voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single charging device is used for various handheld electronic devices with different charging voltages, then device versatility is improved, but current limiting protection reliability deteriorates due to inability to adapt to different voltage requirements
Solution Approach 1:
The patent implements dynamic current limiting by using a control unit to continuously monitor the charging voltage and adjust the current limit accordingly. The control unit dynamically changes the current limiting parameter based on the detected voltage level, enabling the charging device to adapt to different voltage requirements while maintaining reliable protection for each specific voltage condition.
Solution Approach 2:
The patent changes the current limiting parameter based on the charging voltage level. The control unit detects the voltage and selects appropriate current limit values from stored data, effectively changing the protection parameters to match different voltage conditions. This allows a single device to provide reliable protection across multiple voltage standards.
2Reliability
If different charging devices are used for different handheld electronic devices with different charging voltages, then current limiting protection reliability is improved, but device complexity and ease of operation worsen due to need for multiple devices
Solution Approach 1:
The patent makes a single charging device universal by enabling it to handle multiple voltage standards (e.g., 5V, 9V, 12V) through automatic voltage detection and adaptive current limiting. The control unit identifies the voltage level and configures appropriate protection parameters, allowing one device to replace multiple specialized chargers while maintaining reliable protection for each voltage type.
3Reliability
If different charging devices are used for different handheld electronic devices with different charging voltages, then current limiting protection reliability is improved, but ease of operation deteriorates due to trouble in using multiple devices
Solution Approach 1:
The patent implements self-service operation by enabling the charging device to automatically detect the voltage level and configure appropriate current limiting parameters without user intervention. The control unit autonomously identifies the charging voltage and selects the correct protection settings from stored data, making the device as convenient to use as a dedicated single-voltage charger while supporting multiple voltage standards.
4Adaptability or versatility
If adaptive current limiting protection circuit is added to support different charging voltages, then adaptability is improved, but device complexity increases due to additional circuit components
Solution Approach 1:
The patent uses feedback mechanisms where the control unit continuously monitors the charging voltage and adjusts the current limiting parameters accordingly. The control unit receives feedback about the voltage level and automatically configures the appropriate protection settings, enabling adaptive protection without requiring complex hardware circuits for each voltage level.
Solution Approach 2:
The control unit acts as an intermediary between the power supply and the load, mediating the current flow based on detected voltage levels. It selectively applies different current limiting strategies for different voltage conditions, effectively decoupling the complexity of multi-voltage support from the power delivery path while maintaining simple and reliable protection.
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
Enables safe and adaptive current limiting protection across various charging voltages, preventing overcurrent and supporting different charging conditions, thus simplifying the charging process for multiple handheld electronic devices.
Implementation Method 1
The control unit is configured to measure the voltage across the impedance unit to calculate a current value
Data Source
AI summary
A charging device and a handheld electronic device both with adaptive current limiting protection are provided. Both of the charging device and the handheld electronic device have a connection interface and an adaptive current limiting protection circuit comprising an impedance unit, a switch, and a control unit. The control unit is electrically coupled to the switch, the impedance unit, and an electrical path connected to a power pin of the connection interface. The control unit stores a plurality of voltage values and a plurality of different corresponding current limit values. The control unit is configured to measure the voltage of the electrical path to obtain a measured voltage, and the control unit is further configured to measure the voltage across the impedance unit to calculate a current value. When the current value reaches the current limit value corresponding to the measured voltage, the control unit turns off the switch.