Current Sense Protection Circuit for USB-C Short Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
USB Type-C ports require effective overcurrent protection to prevent damage from excessive current, but existing solutions are prone to short circuits, which can lead to component damage and safety risks.
Innovation Solution
A current sense short protection circuit comprising a switch unit, current sensing unit, detection unit, and short detection module that detects voltage differences to generate signals indicating short phenomena, ensuring safe operation by preventing excessive current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current sensing unit is used to detect overcurrent, then overcurrent protection capability is improved, but the risk of short circuit and component damage increases
Solution Approach 1:
The patent introduces a current sensing unit as an intermediary component between the power circuit and control system. This separate sensing unit monitors current without being part of the main power path, allowing detection of overcurrent conditions while isolating the sensing function from potential short circuit hazards in the main circuit.
Solution Approach 2:
The patent implements a feedback mechanism where the current sensing unit continuously monitors current and provides feedback signals to the control system. When overcurrent or short circuit conditions are detected, the feedback signal triggers protective actions to interrupt or limit current flow, preventing component damage while maintaining system reliability.
2Reliability
If electrostatic discharge (ESD) protection is implemented, then protection against static damage is improved, but the system remains vulnerable to overcurrent from short circuits
Solution Approach 1:
The patent designs the current sensing unit and control system to provide multiple protection functions simultaneously. The same sensing mechanism detects both ESD events and overcurrent/short circuit conditions, making the protection system universal rather than specialized for a single threat type. This multi-functional approach ensures comprehensive protection without requiring separate dedicated circuits for each protection type.
3Reliability
If a detection circuit is added to detect short circuits, then system safety is improved, but device complexity increases
Solution Approach 1:
The patent combines the current sensing unit, detection circuitry, and control functions into an integrated solution. Rather than adding separate independent components for sensing, detecting, and controlling, the design merges these functions into a unified system where the current sensing unit directly interfaces with control logic, reducing overall circuit complexity while maintaining comprehensive safety monitoring.
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 detects short circuits and abnormal conditions in current sensing units, enhancing the safety and reliability of USB Type-C ports by preventing damage from overcurrent.
Implementation Method 1
The detection unit detects a second voltage of a second terminal of the current sensing unit and a third voltage of a first terminal of the current sensing unit, and generates a detection signal according to the second voltage of the second terminal of the current sensing unit and the third voltage of the first terminal of the current sensing unit
Data Source
AI summary
A current sense short protection circuit includes a switch unit, a current sensing unit, a detection circuit and a short detection module. The first terminal of the switch unit receives a first voltage. The control terminal of the switch unit receives a control signal. The first terminal of the current sensing unit is coupled to the second terminal of the switch unit. The second terminal of the current sensing unit receives a second voltage. The detection unit receives the second voltage and a third voltage provided by the first terminal of the current sensing unit, and generates a detection signal according to the second voltage and the third voltage. The short detection module receives the first voltage, the second voltage and the detection signal, and generates a short detection signal according to the first voltage, the second voltage and the detection signal.