Receiving Circuit Quality Adjustment via Switching Resistor
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Solution Overview
Problem
Current radio-based access monitoring systems face challenges in maintaining high sensitivity for signal reception while minimizing measurement tolerance, particularly due to temperature-induced resonance frequency shifts and the need for a compromise between sensitivity and stability in resonant circuits, which affects both passive access and transponder functions.
Innovation Solution
A receiving circuit with a resonant circuit comprising a receiving coil, capacitor, and a switching element that controllably connects or disconnects a resistor to adjust the circuit's quality, allowing for high sensitivity during signal reception and low measurement tolerance by switching between parallel and series connections based on operational requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resonant circuit is designed with high quality to maximize sensitivity for signal reception, then the sensitivity is improved, but the measurement precision of field strength deteriorates due to temperature-induced resonance frequency shifts
Solution Approach 1:
The patent applies dynamics by making the resonant circuit adjustable through a switching element that can connect or disconnect a resistor in parallel. This allows the circuit to dynamically change its quality factor Q based on operational requirements - high Q for sensitivity during signal reception, and adjusted Q for stable field strength measurement, resolving the contradiction between these two opposing needs
2Stability of the object's composition
If a resistor is connected in parallel to the resonant circuit to stabilize resonance frequency against temperature changes, then the stability is improved, but the sensitivity deteriorates due to reduced quality factor
Solution Approach 1:
The switching element enables dynamic reconfiguration of the resonant circuit. When stability is needed, the resistor is connected in parallel to damp the circuit and stabilize resonance frequency. When sensitivity is needed, the resistor is disconnected to maximize the quality factor. This dynamic adjustment resolves the contradiction between stability and sensitivity
3Use of energy by moving object
If the receiving circuit is designed with low energy consumption for passive access, then the energy efficiency is improved, but the transmission power for response signals deteriorates
Solution Approach 1:
The receiving circuit operates in periodic cycles: receiving interrogation signals with low power consumption, processing the signals, and then transmitting response signals. The switching element allows the circuit to optimize its energy consumption during the receiving phase while maintaining sufficient transmission power during the response phase, resolving the contradiction through temporal separation of operations
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 solution enables a receiving circuit with low energy consumption, high signal quality, and efficient energy transmission, while maintaining precise field strength measurement accuracy, improving both passive access and transponder functions.
Implementation Method 1
a receiving coil for converting magnetic induction into electrical current
Implementation Method 2
the resonant frequency of which parallel resonant circuit is matched to the LF transmission frequency of the first communication device
Data Source
AI summary
A receiving circuit for a communication unit of an access device has a resonance circuit (1) with a receiving coil (L) for converting a magnetic induction into electrical current, and a capacitor (C). The receiving circuit (10) further has a first resistor (R1) and a switching element (3) designed for controllably connecting and disconnecting the first resistor (R1) to the resonance circuit (1). The receiving circuit electrically connects the resonance circuit (1) to the first resistor (R1) when the circuitry of the resonance circuit (1) changes from a first circuitry (7) to a second circuitry (8), and electrically disconnects the first resistor (R1) from the resonance circuit (1) when the circuitry of the resonance circuit (1) changes from the second circuitry (8) to the first circuitry (7).