Flexible Transit Card Capacitor Power Buffering
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Solution Overview
Problem
Conventional smart cards with display functions require at least 1 second for system operation and frame display, which exceeds the 0.2 to 0.6 seconds available for power generation from an external card reader, preventing completion of system operation and frame display within the limited power supply time.
Innovation Solution
A flexible public transportation card with a capacitor-based power generation system, including a flexible electronic system comprising a flexible display, communication interface, power generator, and capacitor, allowing for quick charging and storage of electricity to power the display circuit, even when outside the electromagnetic induction range of the card reader.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a conventional smart card with display function is used, then the card can perform communication and display operations, but the system operation and frame display take at least 1 second which exceeds the available power supply time
Solution Approach 1:
The capacitor is pre-charged during the electromagnetic induction period when the card reader is active, storing energy before it is needed for display operation. This preliminary energy accumulation allows the display to operate immediately when power is required, without waiting for the full 1 second system startup time.
Solution Approach 2:
The capacitor acts as an intermediary energy storage device between the power generator and the display circuit. It decouples the power generation process from the power consumption process, allowing the display to be driven by stored energy rather than requiring real-time power generation during the entire operation cycle.
2Reliability
If the card operates outside the electromagnetic induction range of the card reader, then communication cannot be maintained, but the display should remain functional
Solution Approach 1:
The capacitor is charged in advance when within the electromagnetic induction range, storing sufficient energy to power the display during periods when the card is outside the reader's range. This preliminary energy storage ensures continuous display operation regardless of communication availability.
Solution Approach 2:
The system dynamically switches between power generation mode (when in range) and power consumption mode (when out of range). The capacitor enables this dynamic transition by buffering energy, allowing the display to maintain operation during the transition and when communication is unavailable.
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
Enables the flexible public transportation card to complete system operation and display frames within the limited power supply time, maintaining normal operations even when power generation is not possible, by storing sufficient electricity in the capacitor.
Implementation Method 1
The power generator is electrically connected to the display circuit and the communication interface, and generates electricity according to the wireless signal
Implementation Method 2
The capacitor stores the electricity generated by the power generator for providing the display circuit with the stored electricity
Data Source
AI summary
A flexible public transportation card with display function is disclosed. The flexible public transportation card with display function comprises a first card body, a second card body and a flexible electronic system. The flexible electronic system is disposed between the first card body and the second card body. The flexible electronic system comprises a flexible display, a display circuit, a communication interface, a power generator and a capacitor. The display circuit is electrically connected to the flexible display. The communication interface receives a wireless signal. The power generator is electrically connected to the display circuit and the communication interface, and generates electricity according to the wireless signal. The capacitor stores the electricity generated by the power generator for providing the display circuit with the stored electricity, such that the flexible display displays a frame. The capacitance of the capacitor ranges between 0.1 and 20 microfarads.