USB Cable Voltage Drop Detection for Safe Battery Charging
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Solution Overview
Problem
Different USB cables exhibit varying resistances, leading to voltage drops that may not satisfy the required voltage output for charging electronic devices, potentially damaging batteries if mismatched cables are used.
Innovation Solution
An electronic device with a system that includes modules to detect voltage drops across USB cables by generating control signals to test charging currents, calculating variation degrees, and prompting users on cable suitability, allowing for selection of optimal charging currents to minimize power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If USB cables with different resistances are used for charging, then the charging current can be supplied to the battery, but the voltage drop across the USB cables varies, causing the voltage output to the battery to be insufficient
Solution Approach 1:
The system performs preliminary detection of voltage drops across different USB cables before actual charging occurs. By testing multiple cables and identifying their voltage drop characteristics in advance, the system selects the most suitable cable for charging, thereby preventing energy loss and ensuring adequate voltage output to the battery from the start
Solution Approach 2:
The system continuously monitors the voltage drop across the USB cable during charging and provides feedback to the control module. Based on this feedback, the system can adjust charging parameters or switch to an alternative cable if the voltage drop exceeds acceptable thresholds, ensuring optimal voltage output and minimizing energy loss
2Reliability
If USB cables with high resistance are used, then connection is established, but the voltage drop increases causing battery damage risk
Solution Approach 1:
The system performs preliminary detection of voltage drops across different USB cables before actual charging occurs. By testing multiple cables and identifying their voltage drop characteristics in advance, the system selects the most suitable cable for charging, thereby preventing energy loss and ensuring adequate voltage output to the battery from the start
Solution Approach 2:
The system proactively identifies and prevents potential harmful effects by detecting USB cables with excessive voltage drop before charging begins. By pre-assessing cable suitability and blocking incompatible cables from being used, the system eliminates the risk of battery damage caused by high resistance cables
3Measurement precision
If multiple USB cables are tested to find the optimal one, then the suitable cable can be identified, but the testing time and system complexity increase
Solution Approach 1:
Instead of testing all possible USB cables exhaustively, the system performs partial testing on a selected subset of cables or uses rapid detection methods that provide sufficient precision without requiring complete evaluation of every cable, thereby reducing testing time while maintaining adequate measurement precision
Solution Approach 2:
The system changes testing parameters such as charging current levels or voltage thresholds during the detection process to quickly identify suitable cables. By dynamically adjusting test conditions, the system accelerates the cable selection process while maintaining accurate identification of optimal cables
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 determines suitable USB cables for charging, reducing electrical power loss and preventing battery damage by identifying and prioritizing cables with minimal voltage drop variation, ensuring safe and efficient charging.
Implementation Method 1
different USB cables may have different resistances, which generate different voltage drops across the USB cables when the battery of the electronic device is charged by the charger via the USB cables
Data Source
AI summary
The present disclosure provides a method for testing a USB cable applied in an electronic device. The electronic device includes a battery charged by a charger via the USB cable. The method can include determining at least two different values of charging currents. The method can further include generating a first control signal according to the determined values of charging currents. Sending the first control signal to the charger via the USB cable, to inform the charger to respectively charge the battery by charging currents with the determined values. Detecting values of at least two voltages output to the battery. Comparing a calculated variation degree between the detected values of voltages with a preset variation degree. Generating a first type of message according to a compared result between the calculated variation degree and the preset variation degree.