Wireless Charging Control for Chipcard Accumulators
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Solution Overview
Problem
Contactless charging of portable data carriers, such as chip cards and transponders, is inefficient due to limited field strength and duration of magnetic coupling, leading to prolonged charging times and potential incomplete charging.
Innovation Solution
The method involves adjusting transmit power to higher levels during charging by stopping data transfer and using multiple operating modes to optimize energy transfer, and initiating charging only after a predetermined dwell time to ensure device presence, thereby increasing field strength and reducing unnecessary energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data transfer is performed simultaneously with charging using magnetic fields, then communication functionality is maintained, but field strength is limited and charging time is prolonged
Solution Approach 1:
The patent implements periodic switching between communication mode and charging mode. The transmitter alternates between transmitting modulated carrier signals for data transfer and transmitting high-power unmodulated carrier signals for charging. This periodic action allows the system to achieve high charging power when needed while maintaining communication functionality at other times, thereby resolving the contradiction between maintaining communication and achieving fast charging.
Solution Approach 2:
The patent dynamically adjusts the transmitter's operating mode based on real-time conditions. The system can switch between different transmission modes (communication-only, charging-only, or combined modes) depending on the charging state, data transfer requirements, and presence of multiple devices. This dynamic adaptability allows optimization of charging speed when possible while maintaining communication when required, resolving the contradiction between charging speed and communication maintenance.
2Productivity
If transmit power is increased to accelerate charging, then charging speed improves, but energy consumption increases and may cause incomplete charging if device presence is not verified
Solution Approach 1:
The patent performs preliminary verification of device presence and charging requirements before initiating high-power charging. The system first detects whether a target device is present in the communication area, then verifies whether charging is actually needed (e.g., by checking battery state). Only after these preliminary checks confirm the necessity does the system switch to high-power charging mode. This preliminary action prevents wasteful energy consumption from charging devices that are already fully charged or not present, while still enabling fast charging when needed.
Solution Approach 2:
The patent implements feedback mechanisms to monitor charging status and device presence continuously. The receiver provides feedback about its charging state, and the transmitter adjusts its power output accordingly. If the device is removed or charging is complete, the system receives feedback and stops or reduces power transmission. This feedback loop ensures energy is not wasted on unnecessary charging while maintaining high charging speed when the device is present and needs power.
3Speed
If charging is initiated immediately upon detecting a device, then charging starts faster, but unnecessary energy is consumed if the device is not truly present or already charged
Solution Approach 1:
The patent performs preliminary verification of device presence and charging requirements before initiating high-power charging. The system first detects whether a target device is present in the communication area, then verifies whether charging is actually needed (e.g., by checking battery state). Only after these preliminary checks confirm the necessity does the system switch to high-power charging mode. This preliminary action prevents wasteful energy consumption from charging devices that are already fully charged or not present, while still enabling fast charging when needed.
Solution Approach 2:
The patent enables the receiving device to autonomously indicate its charging status and requirements. The receiver can self-report whether it needs charging, its current battery state, and whether it should continue receiving power. This self-service capability allows the transmitter to make informed decisions about whether to initiate or continue charging, avoiding unnecessary energy consumption while maintaining rapid charging initiation when the device genuinely needs power.
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 enables faster and more efficient contactless charging by maximizing field strength and minimizing unnecessary energy use, ensuring complete charging cycles and extending battery life.
Implementation Method 1
an alternating voltage induced by the magnetic alternating field in the antenna coil of the transponder
Implementation Method 2
a pin with a ferrite core and a transmitting coil
Data Source
AI summary
Method, apparatus and system for contactless charging of an energy storage unit of an energy sink (2) by an energy source (1). Data are transferred between the energy source and the energy sink via an alternating field in a first operating mode of the energy source. In a second operating mode of the energy source, an energy necessary for charging is transferred from the energy source to the energy sink via the alternating field. In the second operating mode, no data are transferred from the energy source to the energy sink and the alternating field is therefore produced with a field strength that is greater than a possible field strength upon simultaneous transfer of data and charging energy.