Contactless Battery Charging via Communication Field Segmentation
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Solution Overview
Problem
The integration of batteries into small portable devices like smart cards is challenging due to size constraints, and existing contactless charging methods face issues with electromagnetic field over-consumption causing communication errors and unpredictable data exchanges, limiting the use of rechargeable batteries in contactless smart cards.
Innovation Solution
A process for maximizing battery charging in portable devices using a modulated electromagnetic communication field, where the device sends waiting and adjustment messages to the reader to optimize power usage and recharge the battery during communication downtime, utilizing the electromagnetic field energy during waiting periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electromagnetic field is used to both supply power and communicate with the smart card, then contactless operation is enabled, but the electromagnetic field becomes over-consumed causing communication errors
Solution Approach 1:
The patent segments the electromagnetic field usage into two distinct phases: a communication phase where the field is modulated for data exchange, and a recharging phase where the field is used solely for power transfer. This segmentation prevents the field over-consumption that causes communication errors by ensuring that when recharging occurs, no communication takes place simultaneously.
Solution Approach 2:
The patent implements periodic switching between communication mode and recharging mode. The smart card alternates between sending communication blocks and entering recharging periods, creating a rhythmic pattern of operation. This periodic action ensures that the electromagnetic field is not continuously over-consumed, maintaining communication reliability while enabling battery recharging.
2Duration of action of moving object
If the smart card recharges its battery during communication, then battery life is extended, but communication errors occur due to field modulation conflicts
Solution Approach 1:
The smart card employs periodic recharging cycles interspersed with communication blocks. After exchanging a certain number of communication blocks, the card enters a recharging period where it absorbs energy from the electromagnetic field. This periodic structure extends battery life while preventing communication errors by ensuring recharging occurs during dedicated time windows when no communication is taking place.
Solution Approach 2:
The patent ensures continuous operation by seamlessly alternating between communication and recharging modes. The smart card maintains its functional continuity by switching between these two states, ensuring that neither communication nor battery maintenance is completely interrupted. This continuous alternation allows the card to remain operational indefinitely without compromising either communication reliability or battery life.
3Adaptability or versatility
If data exchanges between reader and card are unpredictable, then communication flexibility is maintained, but no time interval can be reserved for battery recharging
Solution Approach 1:
The smart card uses feedback mechanisms to monitor its battery status and the communication flow. Based on this feedback, the card dynamically determines when to initiate recharging periods. The card can send indicators to the reader about its recharging needs, and the reader can adjust the electromagnetic field transmission accordingly. This feedback loop maintains communication flexibility while ensuring that battery recharging occurs at appropriate intervals.
Solution Approach 2:
The patent implements dynamic control of the communication-recharging schedule. Rather than following a fixed pattern, the smart card adapts its recharging timing based on communication demands and battery status. The card can dynamically request recharging periods when communication activity allows, and the reader can dynamically adjust field transmission to accommodate these requests. This dynamic approach preserves communication flexibility while enabling effective battery maintenance.
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 approach allows for efficient battery recharging without disrupting communication, enabling the use of rechargeable batteries in contactless smart cards by optimizing power usage from the electromagnetic field during communication downtime, ensuring reliable operation and extended battery life.
Implementation Method 1
The portable object includes means for recovering energy from the electromagnetic field
Data Source
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AI summary
To recharge the battery of a portable object communicating with a reader establishing communication over a modulated electromagneticfield, a recharging process is proposed.The portable object sends at least one waiting message to the reader.The said waiting message tells the reader a waiting time WTXM before the next message.The portable object uses energy from the electromagnetic field to recharge its battery during the waiting period.