Non-Volatile Status Storage via Energy Coupling
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Solution Overview
Problem
Existing security systems, such as chip cards, face vulnerabilities when supply voltage is interrupted, leading to loss of information stored in volatile memory, making them susceptible to unauthorized access and attacks.
Innovation Solution
A device for non-volatile storage of a status value is implemented, utilizing energy storage to write a status value to a non-volatile memory cell when a condition occurs, such as a supply voltage interruption, allowing information to be stored even after the energy supply is interrupted, using a switch coupled with a control input to a voltage derived from the supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If volatile memory is used for storing status information, then the device complexity is reduced, but the reliability deteriorates due to information loss during power interruptions
Solution Approach 1:
The patent applies preliminary action by pre-charging energy storage elements (capacitors) during normal operation before a power interruption occurs. When a power failure happens, the pre-stored energy in these capacitors is immediately available to maintain the memory cell state and trigger the non-volatile storage mechanism, eliminating the need for complex real-time power management during critical events.
Solution Approach 2:
The patent introduces an intermediary energy storage mechanism (capacitors and switches) that bridges the gap between volatile memory and non-volatile storage. This intermediary structure temporarily holds energy and status information, allowing the system to transition from a volatile to a non-volatile state during power interruptions without requiring the entire memory system to be non-volatile.
2Reliability
If non-volatile storage is implemented for all data, then the reliability is improved, but the energy consumption increases
Solution Approach 1:
The patent applies local quality by implementing non-volatile storage only for specific critical status information (alarm conditions, power interruption events) rather than all data. The memory system maintains a hybrid architecture where general data remains in volatile memory while critical security-relevant status bits are stored in non-volatile memory cells, optimizing both energy consumption and reliability for different data types.
Solution Approach 2:
The patent uses partial action by storing only the essential status information (alarm flags, power failure indicators) in non-volatile memory rather than complete data sets. This selective approach provides sufficient reliability for security monitoring while minimizing the energy overhead associated with non-volatile storage operations.
3Reliability
If energy storage is coupled to non-volatile memory to write status values, then the security is improved, but the device complexity increases
Solution Approach 1:
The patent merges the energy storage function and non-volatile memory function into an integrated security mechanism. The capacitors, switches, and memory cells work together as a unified system where the energy storage elements directly trigger the memory write operation when power interruptions occur, eliminating the need for separate complex control logic and reducing overall device complexity.
Solution Approach 2:
The patent implements self-service by designing a system where the energy storage elements automatically trigger the non-volatile storage operation when power interruptions occur. The circuit uses the stored energy itself to activate the write mechanism, eliminating the need for external control signals or complex power management logic during critical events.
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 enhances security by enabling the storage of information in a non-volatile manner, reducing the risk of data loss during power interruptions and limiting potential attacks by allowing secure storage and retrieval of alarm information, even after a restart.
Implementation Method 1
energy storage for storing energy when applying a supply voltage
Data Source
AI summary
A device for non-volatile storage of a status value indicating that there has been a condition, including a non-volatile storage, an energy storage for storing energy when applying a supply voltage, and a switching circuit to couple the energy storage to the non-volatile storage to write the status value thereto if the condition is present.