Magnetostrictive Dental Scaler Dynamic Control Circuit
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Solution Overview
Problem
Existing ultrasonic dental scalers face mechanical and electronic disadvantages in automatic frequency and amplitude tuning, such as fragile wirings, inaccurate signal processing, and interference, making manual tuning inconvenient and inefficient.
Innovation Solution
A digital signal processor-based control circuit with dynamic filter loops that adjusts frequency and amplitude of vibrations using phase detection and voltage-controlled oscillation, along with a voice input control module for hands-free operation, to maintain a desired operating point under varying loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual tuning of frequency and amplitude is used, then the device structure remains simple, but the ease of operation deteriorates due to inconvenience
Solution Approach 1:
The control circuit automatically detects resonance frequency and adjusts operating parameters without requiring manual user intervention. The system self-regulates frequency and amplitude by monitoring feedback signals and dynamically adjusting the oscillator output, eliminating the need for manual tuning while maintaining operational simplicity.
Solution Approach 2:
The system employs feedback coils to detect vibrations and generate feedback signals that are processed by the control circuit. This feedback mechanism enables automatic detection of resonance conditions and real-time adjustment of operating parameters, resolving the contradiction between automated control and system complexity.
2Ease of operation
If automatic tuning circuits utilizing feedback coils are used, then the ease of operation improves, but the reliability deteriorates due to fragile wirings and interference
Solution Approach 1:
The patent extracts and eliminates the fragile wiring connections associated with traditional feedback coils by implementing a contactless feedback detection mechanism. The system uses electromagnetic coupling through the handpiece structure itself to obtain feedback signals, removing the physical wiring that causes reliability issues while preserving automatic tuning functionality.
Solution Approach 2:
The invention replaces the mechanical wiring-based feedback system with an electromagnetic field-based detection system. By using inductive coupling and electromagnetic signals transmitted through the handpiece body, the system eliminates mechanical connections and their associated fragility while maintaining feedback functionality for automatic tuning.
3Ease of operation
If automatic tuning circuits are used, then the ease of operation improves, but the measurement precision deteriorates due to inaccurate signal processing
Solution Approach 1:
The control circuit dynamically adjusts its signal processing parameters and filter characteristics based on the detected resonance frequency and operating conditions. The system continuously adapts its measurement and control parameters to maintain optimal precision across varying operational states, rather than using fixed processing parameters.
Solution Approach 2:
The system changes multiple operating parameters simultaneously including frequency, amplitude, and filter characteristics to optimize signal processing accuracy. By dynamically adjusting these parameters based on real-time feedback, the system maintains high measurement precision while operating automatically without manual intervention.
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
Enhances control and performance by dynamically tracking resonance and adjusting vibrations accurately, reducing mechanical and electronic drawbacks, and allowing for hands-free operation during dental procedures.
Implementation Method 1
a phase detector adapted to detect phase between current and voltage signals and to generate a phase detection signal as a function of the phase
Implementation Method 2
a voltage controlled oscillator operatively connected to the digital signal processor, wherein the error signal outputs a voltage to operate the voltage controlled oscillator which, in response thereto, adjusts at least one of frequency and amplitude of vibrations of the tool tip
Implementation Method 3
ultrasonic magnetostrictive dental scaler
Data Source
AI summary
A magnetostrictive ultrasonic dental scaler is disclosed. The magnetostrictive device comprises an oscillator adapted to provide electrical energy including a current and a voltage signal, a handpiece having a tool tip which vibrates in response to the electrical energy supplied to the handpiece and a control circuit. The control circuit includes a phase detector adapted to detect phase between current and voltage signals and to generate a phase detection signal as a function of the phase. The control circuit also includes a digital signal processor operatively connected to the phase detector. The digital signal processor adapted to process the phase detection signal through a digital loop filter to generate an error signal. The control circuit further includes a voltage controlled oscillator operatively connected to the digital signal processor, wherein the error signal outputs a voltage to operate the voltage controlled oscillator which in response thereto adjusts at least one of frequency and amplitude of vibrations of the tool tip.