Auto-Tuning Resonant Circuit With Switched Capacitor Feedback
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Solution Overview
Problem
Existing auto-tuning resonant circuit topologies in buried utility locating devices face inaccuracies due to component tolerances and drift, leading to improperly tuned output signals, and are often cumbersome and costly to maintain, especially in high Q factor applications where environmental conditions like temperature and soil moisture interfere with signal tuning.
Innovation Solution
An auto-tuning module with a tunable resonant circuit element comprising a capacitor, inductor, and a capacitive voltage divider, along with a tuning array of switched capacitors, driven by an input signal, which includes a control element for measuring output signal strength and adjusting the capacitance to optimize tuning, thereby compensating for component variations and environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual tuning of resonant circuits is implemented, then tuning adjustability is improved, but operation complexity and time consumption increase
Solution Approach 1:
The system performs automatic tuning without human intervention by using a microprocessor to control switching elements that adjust capacitor connections based on detected signal strength, eliminating the need for manual tuning operations while maintaining adaptability
Solution Approach 2:
The patent replaces manual mechanical tuning operations with an automated electronic control system using a microprocessor and electronically controllable switching elements, substituting mechanical adjustment with electronic control to reduce operation complexity
2Manufacturing precision
If high precision tuning components are used, then manufacturing precision is improved, but device cost and size increase
Solution Approach 1:
The system achieves precise tuning by dynamically changing the effective capacitance value through electronic switching of multiple capacitor elements with different values, controlled by a microprocessor based on detected signal strength, avoiding the need for single high-precision components
Solution Approach 2:
The patent divides the tuning function into multiple discrete capacitor elements that can be independently switched in and out of the circuit, allowing precise adjustment of total capacitance through combination of smaller components rather than requiring one large precision component
3Device complexity
If fixed tuned resonant circuits are used, then device simplicity is improved, but reliability decreases due to component drift
Solution Approach 1:
The system continuously monitors output signal strength and uses this feedback to automatically adjust the resonant circuit tuning parameters, ensuring the circuit maintains optimal performance despite component drift or environmental changes, thereby improving reliability
Solution Approach 2:
The patent transforms the fixed tuned circuit into a dynamically adjustable system where capacitance values can change in real-time based on operating conditions, allowing the circuit to adapt and maintain reliability under varying environmental conditions
4Adaptability or versatility
If tunable resonant circuits with many components are used, then adaptability is improved, but device cost increases
Solution Approach 1:
The microprocessor-based control system serves multiple functions: it controls switching elements for tuning adjustment, measures signal strength, determines optimal tuning parameters, and adapts to different operating conditions, replacing what would otherwise require multiple dedicated components
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
The auto-tuning module ensures precise and efficient generation of tuned output signals, reducing human error and costs by automatically adjusting for component drift and environmental conditions, maintaining accurate signal tuning across varying conditions.
Implementation Method 1
resonant circuit having different topologies to achieve tuning... relying on the inherent tuning of networks of capacitors and inductors... driving the circuit to achieve the tuned output signal
Implementation Method 2
a control element having a sensing element for measuring output signal strength
Data Source
AI summary
Signal generation devices including an auto-tuning electronic circuit module for generating tuned output signals are disclosed. The auto-tuning electronic circuit module may include a tunable resonant electronic circuit element for providing a tuned output signal, including a voltage divider element and a tuning array element and control element.