Port Power-Gating Circuit for Secure Device Detection
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Solution Overview
Problem
Information handling systems (IHS) face challenges in securely managing input/output ports to prevent data loss and unauthorized access, as existing solutions struggle to distinguish between desirable and undesirable devices connected to these ports.
Innovation Solution
A port securing module is introduced, comprising a power gate, resistor, and operational amplifier, which monitors current draw to determine if a load is coupled to the port, activating the power gate only when an authorized device is present, ensuring adequate voltage supply while preventing unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If port security restrictions are implemented to prevent unauthorized device access, then data security is improved, but legitimate device access becomes more difficult
Solution Approach 1:
The system performs preliminary actions by detecting the presence and type of device connected to the port before allowing access. The power management module monitors current draw characteristics to identify authorized devices (such as keyboards and mice) and only then enables power supply and port access, preventing unauthorized devices from gaining access while allowing legitimate ones
Solution Approach 2:
The system implements feedback mechanisms where the power management module continuously monitors current draw from devices connected to USB ports. Based on this feedback, the system dynamically adjusts power supply - providing power to authorized devices that exhibit expected current characteristics while denying power to unauthorized devices, thus resolving the contradiction between security and accessibility
2Measurement precision
If power supply monitoring is used to detect device presence, then unauthorized device detection is improved, but power supply stability for authorized devices may be compromised
Solution Approach 1:
The power management system is segmented into separate functional modules: a detection module that monitors current draw to identify device presence and type, and a power supply module that provides stable power to authorized devices. This segmentation allows precise device detection through current monitoring without compromising the stability of power supply to authorized devices, as each module performs its dedicated function independently
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
This solution effectively secures IHS ports by enabling secure boot processes, preventing unauthorized device usage, and maintaining adequate power supply to authorized devices, thus enhancing data security and system integrity.
Implementation Method 1
a resistor coupled in parallel to the power gate, and an operational amplifier including an inverting input and a non-inverting input that couple the operational amplifier in parallel to each of the power gate and the resistor
Implementation Method 2
a power gate that is operable to be coupled in series to a first power source and to a load
Data Source
AI summary
A port securing module includes a power gate that is operable to be coupled in series to a power source and to a load. A resistor is coupled in parallel to the power gate. An operational amplifier includes an inverting input and a non-inverting input that couple the operational amplifier in parallel to each of the power gate and the resistor. The operational amplifier also includes an output that is operable to indicate whether a load is coupled to the power gate and, if a load is coupled to the power gate, supply a voltage to activate the power gate such that power is supplied to the load.