Auto-Tuning Resonant Circuit With Switched Capacitor Array
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Solution Overview
Problem
Existing auto-tuning resonant circuit topologies in buried utility locating devices experience inaccuracies due to component tolerances and drift, leading to improperly tuned output signals, and require costly and large components for high precision, while manual tuning is cumbersome and prone to errors.
Innovation Solution
An auto-tuning module with a tunable resonant circuit element, including a capacitive voltage divider and a tuning array of switched capacitors, driven by an input signal, which uses a control element to measure and adjust the output signal strength to achieve precise tuning, compensating for component variations and environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual tuning of resonant circuits is implemented, then tuning capability is achieved, but operation complexity and time consumption increase significantly
Solution Approach 1:
The system performs automatic tuning through a microprocessor-controlled algorithm that measures output signal strength, compares it to stored values, and autonomously adjusts switched capacitors to achieve optimal tuning without human intervention, eliminating manual operation requirements and reducing tuning time to seconds
Solution Approach 2:
The system implements feedback control by continuously measuring output signal strength with a sensing element, comparing current measurements to previously stored optimal values, and using this feedback information to drive automatic capacitor switching adjustments until optimal tuning is achieved
2Measurement precision
If high precision tunable resonant circuit components are used, then tuning accuracy is improved, but device size and cost increase
Solution Approach 1:
The tuning array is segmented into multiple switched capacitors with progressively scaled capacitance values rather than using a single large precision capacitor. This segmentation allows achieving fine tuning resolution through combination of smaller capacitor steps, reducing individual component size and overall circuit complexity while maintaining high tuning accuracy
Solution Approach 2:
The system changes the effective capacitance parameter dynamically by switching between different capacitor combinations in the tuning array based on measured signal strength, rather than relying on fixed precision components. This allows adaptive optimization of tuning parameters to achieve high accuracy with simpler components
3Device complexity
If fixed tuned resonant circuits are used, then circuit simplicity is maintained, but tuning accuracy degrades due to component tolerances and drift
Solution Approach 1:
The system transitions from static fixed tuned circuits to dynamic automatic tuning by implementing a microprocessor-controlled algorithm that continuously monitors output signal strength and adjusts capacitor switching in real-time to compensate for component tolerances and environmental drift, maintaining high tuning accuracy while keeping the base circuit relatively simple
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 provides accurate and efficient tuning of output signals, reducing human error and component costs, while maintaining a compact design by progressively scaling capacitance values and voltage ratings, effectively addressing tuning inaccuracies and drift in various environmental conditions.
Implementation Method 1
a tunable resonant circuit element having a first capacitor and an inductor in series driven by an input signal
Implementation Method 2
The tunable resonant circuit element may further include a capacitive voltage divider element comprising a pair of capacitors on a branch tapped between the first capacitor and inductor
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.