Contactless Data Storage Detection Circuit
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Solution Overview
Problem
Existing detection methods for contactless data storage devices within a communication range of an antenna require inefficient periodic emission of identification/authentication signals, consuming excessive power when no device is present, and often necessitate receiving circuits to generate envelope pulses or include time delays for stable oscillation detection.
Innovation Solution
A detection circuit that generates an evaluation signal during the amplitude build-up of carrier oscillations at the beginning of the electromagnetic field pulse, allowing for the detection of contactless data storage devices based on threshold values and slope or phase shifts, without the need for receiving circuits to generate envelope pulses or time delays, thereby reducing energy consumption and improving detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic emission of identification/authentication signals is used to detect contactless data storage devices, then detection capability is maintained, but energy consumption increases significantly
Solution Approach 1:
The patent applies periodic action by using short electromagnetic field pulses instead of continuous signals. The system emits brief pulses and evaluates the return signal during each pulse, maintaining detection capability while significantly reducing energy consumption compared to periodic full authentication signals.
Solution Approach 2:
The patent implements preliminary action by performing detection using short electromagnetic pulses before initiating full authentication sequences. This preliminary detection phase allows the system to identify presence of data storage devices early, avoiding unnecessary energy-consuming authentication attempts when no devices are present.
2Reliability
If receiving circuits generate envelope pulses for detection, then device presence can be identified, but system complexity increases
Solution Approach 1:
The patent extracts only the essential detection function by evaluating the return signal directly during the electromagnetic pulse without requiring separate envelope pulse generation circuits. This extraction approach maintains detection accuracy while eliminating unnecessary receiving circuit components.
Solution Approach 2:
The antenna system performs multiple functions: it generates the electromagnetic field, detects the return signal, and provides detection information all in one integrated structure. This multi-functionality eliminates the need for separate receiving circuits dedicated to envelope pulse generation, reducing system complexity.
3Measurement precision
If time delay is introduced for stable oscillation detection, then measurement accuracy improves, but detection speed decreases
Solution Approach 1:
The patent skips the traditional waiting period for stable oscillations by evaluating the return signal during the electromagnetic pulse itself. This rushing through approach maintains measurement accuracy by using threshold-based evaluation of the return signal while significantly reducing detection time.
Solution Approach 2:
The system performs preliminary evaluation of the return signal during the electromagnetic pulse generation itself, rather than waiting for stable oscillations to establish. This preliminary action enables faster detection while maintaining accuracy through threshold comparison of the return signal amplitude.
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 detection of contactless data storage devices before carrier oscillations stabilize, reducing energy consumption and eliminating the need for time delays, thus enhancing the efficiency of detecting the presence of devices within the communication range.
Implementation Method 1
an antenna (4) for emitting an electromagnetic field (3)
Data Source
AI summary
For detecting within a communication range of an antenna a contactless data storage device which is configured for inductive coupling with an electromagnetic field emitted by the antenna, a return signal is detected (S1) at the antenna during emission of an electromagnetic field pulse. During amplitude build-up of carrier oscillation at the beginning of the electromagnetic field pulse, an evaluation signal is generated (S2) based on the return signal, and the data storage device is detected (S3) based on the evaluation signal. By detecting the presence of the data storage device based on an evaluation signal generated during amplitude build-up, the detection of the data storage device can be initiated before carrier oscillation of the electromagnetic field pulse is stable. Consequently, the width of the electromagnetic field pulse can be shortened and, therefore, energy consumption for detecting the presence of the data storage device can be reduced.