Case Tampering Detection Power Management for Computer Systems
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Solution Overview
Problem
Computer systems with microcontroller units powered by mercury batteries or super capacitors face power depletion within weeks when shut down, preventing reliable recording of case tampering events.
Innovation Solution
A case tampering detection device with a power supply unit that uses an auxiliary power source, such as a mercury battery or super capacitor, to supply power to the microcontroller unit only when the computer case is opened, allowing the recording of tampering events and time stamps even when the system is powered off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the microcontroller unit is powered by a mercury battery, lithium battery or super capacitor, then the computer system can record case tampering events when shut down, but the power may be run out within a specific period of time (such as two weeks), making the microcontroller unit unable to reliably record the case tampering event
Solution Approach 1:
The system dynamically adjusts the power supply state of the microcontroller unit based on detector signals. When the case is closed, the microcontroller enters a low-power state powered by the battery. When the case is opened, the main power supply activates the microcontroller. This dynamic state transition optimizes both reliability and duration by using the battery only when necessary.
Solution Approach 2:
The detector automatically triggers the power supply to the microcontroller unit when case opening is detected, without requiring external intervention. The system self-manages the power activation sequence, ensuring the microcontroller receives power precisely when needed to record tampering events, thereby extending the effective monitoring duration.
2Reliability
If the microcontroller unit is continuously powered to ensure reliable case tampering detection, then the detection reliability is improved, but the power consumption increases, depleting the battery within a short period
Solution Approach 1:
Instead of continuous power supply, the system uses periodic activation triggered by case opening events. The microcontroller unit remains in a low-power state during normal operation and is activated only periodically when the detector signals a case opening. This periodic action significantly reduces power consumption while maintaining detection reliability.
Solution Approach 2:
The power supply state of the microcontroller unit dynamically transitions between low-power and active states based on detector input. This dynamic power management ensures the microcontroller consumes minimal energy during normal operation while providing full functionality when case tampering occurs, resolving the contradiction between reliability and energy consumption.
3Duration of action of moving object
If the power supply unit supplies power to the microcontroller unit only when the detection result indicates that computer case is opened, then the power consumption is reduced and duration is extended, but the system complexity increases due to the additional power management logic
Solution Approach 1:
The power management functionality is merged into the existing detector and microcontroller unit components. The detector not only detects case opening but also directly controls the power supply to the microcontroller. This merging approach extends power supply duration while minimizing additional system complexity by utilizing existing components for multiple functions.
Solution Approach 2:
The detector acts as an intermediary between the case opening event and the power supply to the microcontroller unit. Instead of adding complex power management logic, the system uses the detector's output signal to automatically control power delivery. This intermediary approach simplifies the overall system architecture while achieving the desired power management objectives.
Data Source
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AI summary
A case tampering detection device (1) is provided. The case tampering detection device (1), used for a computer system covered with a computer case, includes at least one detector (10) for detecting whether the computer case is opened and generating a detection result; a storage unit (40); a microcontroller unit (30), coupled to the storage unit (40), for generating a case tampering event and storing the case tampering event in the microcontroller unit (30) or the storage unit (40) when being powered; and a power supply unit (20), coupled to the at least one detector (10), for receiving the detection result, and supplying power to the microcontroller unit (30) when the detection result indicates that the computer case is opened.