USB Magnetic Cable Thermal Protection Circuit
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Solution Overview
Problem
Current USB function-type magnetic cables lack protection for themselves, devices, and interfaces, particularly failing to detect and respond to temperature abnormalities and voltage issues.
Innovation Solution
Incorporating a first PCB board with a USB master control chip, field-effect transistor, thermistor, and resistors/capacitors to detect temperature and voltage anomalies, automatically cutting off the power supply to prevent overheating or combustion, combined with a magnetic attraction mechanism for convenient blind-mate connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If USB function-type magnetic cables are used for data and electricity transmission, then connectivity and utility are improved, but protection against temperature and voltage abnormalities is lacking
Solution Approach 1:
The patent implements preliminary protective actions by incorporating a control circuit that proactively monitors temperature and voltage parameters before abnormal conditions can cause damage. The system performs preliminary detection and automatically cuts off power supply when thresholds are approached, preventing harmful effects before they occur.
Solution Approach 2:
The patent establishes a feedback mechanism where the control circuit continuously monitors temperature and voltage parameters, compares them against predetermined thresholds, and automatically adjusts the power supply state accordingly. This closed-loop feedback system ensures reliable protection while maintaining normal transmission functionality.
2Reliability
If protection mechanisms are added to detect temperature and voltage abnormalities, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing a control circuit that simultaneously performs multiple functions: monitoring temperature, monitoring voltage, comparing parameters against thresholds, controlling power supply state, and protecting both the cable and connected devices. This consolidates multiple protective functions into a single integrated system, minimizing added complexity.
3Object-affected harmful factors
If automatic power cutoff is implemented when abnormalities are detected, then safety is improved, but response time and detection capability must be optimized
Solution Approach 1:
The patent implements preliminary anti-action by setting predetermined threshold values for temperature and voltage parameters before harmful effects can occur. The control circuit continuously compares real-time measurements against these pre-established thresholds and automatically takes countermeasures (power cutoff) when thresholds are exceeded, preventing harmful effects before they can damage the cable or devices.
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 effectively protects the USB cable, device, and interfaces by detecting and mitigating temperature and voltage abnormalities, ensuring safe operation and prolonging the service life while enabling quick and convenient data/electricity transmission.
Implementation Method 1
a thermistor, a power input interface and a power output interface; one end of the thermistor is in connection with an input end of the USB master control chip
Implementation Method 2
a field-effect transistor, a thermistor, a power input interface and a power output interface; an output end of the USB master control chip is in connection with a grid electrode of the field-effect transistor, a source electrode of the field-effect transistor is in connection with the power input interface, a drain electrode of the field-effect transistor is in connection with one end of the power output interface
Implementation Method 3
the end B of the USB cable main body further includes a first metal shell, a first plastic molding head, a plastic cement locating element, a first neodymium-iron-boron magnet and a pogo pin; the USB moveable plug includes a second neodymium-iron-boron magnet; when the end B of the USB cable main body is in moveable connection with the USB moveable plug, the exposed metal shell and the second neodymium-iron-boron magnet are in magnetic attraction with the end B of the USB cable main body
Data Source
AI summary
The disclosure relates to a USB function-type magnetic cable, comprising a USB cable main body and a USB moveable plug; an end B of the USB cable main body is in moveable connection with the USB moveable plug; an end A of the USB cable main body is in connection with a computer or charger, the end B of the USB cable main body is in connection with a mobile device through the USB moveable plug; the end B of the USB cable main body comprises a first PCB board, and the first PCB board is configured to output a control signal to cut off a power supply circuit when detecting a temperature abnormity of the USB moveable plug or a supply voltage abnormity.