Smart Card Current Source Regulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
SIM cards often exceed permissible current consumption limits due to varying operational parameters, leading to inefficiencies and performance reductions, as existing solutions require complex programming and result in delayed corrections and overshoots.
Innovation Solution
A smart card with a current source configured to provide a predefined current intensity to its components, utilizing a series regulator and current mirror to maintain a constant supply current, and a regulator to control voltage and clock signals, ensuring reliable operation within specified limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If programming measures are used to limit current consumption (e.g., introducing NOP operations or reducing system frequency), then current consumption is kept below permitted limits, but device complexity increases and performance is reduced
Solution Approach 1:
The system uses its own current consumption measurements to automatically control the clock signal, creating a self-regulating mechanism that limits current without external programming intervention. The control unit continuously monitors current draw and adjusts clocking accordingly, making the system self-sufficient in managing its power consumption.
Solution Approach 2:
A feedback loop is established where the control unit monitors the actual current consumption and uses this information to adjust the clock signal frequency or suppression, ensuring current limits are maintained while optimizing performance. This closed-loop control eliminates the need for pre-programmed current management sequences.
2Use of energy by moving object
If an integrated automatism with control loop is used to suppress system clock when current exceeds threshold, then current limits are enforced, but correction delays occur due to synchronization requirements and dead time
Solution Approach 1:
The control unit proactively manages clock suppression before current limits are severely exceeded by continuously monitoring current consumption and anticipating threshold violations. This preliminary action allows the system to adjust clocking in advance, reducing the need for corrective delays when limits are approached.
Solution Approach 2:
The system dynamically adjusts the clock signal based on real-time current conditions, allowing flexible response times that adapt to varying operational states. This dynamic control enables faster response compared to fixed synchronization intervals, reducing correction delays while maintaining current limits.
3Reliability
If a long time constant is used in the control loop, then mean current value is well controlled, but severe load changes are corrected with delay and specification adherence is difficult
Solution Approach 1:
The control system dynamically adjusts its response characteristics based on operational conditions, allowing it to maintain stable mean current control during normal operation while responding more quickly to severe load changes. This dynamic behavior resolves the trade-off between stability and responsiveness.
Solution Approach 2:
The system changes operational parameters (such as clock frequency suppression levels) in response to varying load conditions, allowing it to maintain reliable current control under normal conditions while adapting to handle severe load changes more effectively, improving both reliability and productivity across different operating states.
4Productivity
If current consumption is allowed to exceed limits temporarily, then performance is maintained, but specification adherence is violated and efficiency is reduced
Solution Approach 1:
The control unit continuously monitors current consumption and uses this feedback to adjust clock signal suppression in real-time, ensuring current limits are maintained without significantly impacting performance. This allows the system to operate efficiently within specifications by making dynamic adjustments based on actual power draw.
Solution Approach 2:
The system applies partial clock suppression only when necessary to maintain current limits, rather than continuously suppressing clocks. This selective application of current management allows performance to be maintained as much as possible while still adhering to current specifications during critical periods.
Data Source
AI summary
In accordance with various embodiments, a smart card including one or more components to be supplied and a current source, which is configured to provide a supply current with a predefined current intensity to the one or more components to be supplied, is described.