Multi-Frequency VCO Sensor Circuit for Uniform Movement Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The sensitivity of existing electronic sensor systems for detecting movement along an electrical line is not constant, leading to varying detectability of mass movement, with some areas being highly sensitive while others are not, causing false triggers when trying to compensate for low sensitivity areas.
Innovation Solution
The system uses a frequency-locked loop (FLL) with a voltage-controlled oscillator (VCO) and a reference signal that alternates between different frequencies to maintain sensitivity across the line, ensuring consistent detection of mass movement by adjusting the frequency of the oscillatable electrical circuit based on changing capacitance or inductance influenced by moving masses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single frequency is used for the oscillating circuit, then the circuit structure is simple, but the sensitivity varies significantly at different positions along the line
Solution Approach 1:
The patent applies periodic action by alternating between at least two different reference frequencies in a time-multiplexed manner. The control loop switches between different reference frequencies periodically, allowing the system to detect mass movements at multiple frequency points. This periodic switching enables comprehensive coverage of sensitivity variations along the line while maintaining a relatively simple circuit structure.
Solution Approach 2:
The patent implements parameter changes by varying the reference frequency parameter. Instead of using a fixed reference frequency, the system dynamically changes the reference frequency between at least two different values. This parameter variation allows the system to adapt to different sensitivity characteristics at different positions along the electrical line, thereby improving overall detection sensitivity.
2Reliability
If the trigger threshold is lowered to detect movements in low sensitivity areas, then detection coverage improves, but false triggers increase in high sensitivity areas
Solution Approach 1:
By periodically switching between multiple reference frequencies, the system can identify true mass movements that consistently affect sensitivity across different frequency measurements, while filtering out false triggers that may only affect specific frequency points. This periodic multi-frequency approach enables reliable detection with reduced false positives.
Solution Approach 2:
The control loop continuously monitors the oscillation frequency and compares it against reference frequencies, providing feedback to distinguish between genuine mass movements and false trigger sources. The feedback mechanism evaluates responses across multiple reference frequencies to validate detection signals, reducing false triggers while maintaining comprehensive detection coverage.
3Reliability
If multiple reference frequencies are used to maintain constant sensitivity, then detection reliability improves, but the control loop complexity increases
Solution Approach 1:
The control loop manages multiple reference frequencies through periodic switching rather than simultaneous processing. By time-multiplexing the reference frequencies and alternating between them in a periodic manner, the system achieves constant sensitivity across the line while keeping the control loop structure relatively simple and manageable.
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 approach maintains consistent sensitivity along the line by adjusting the frequency of the oscillatable circuit to match different reference frequencies, effectively detecting mass movement without sharp drops in sensitivity, reducing false triggers and improving detection reliability.
Implementation Method 1
a voltage-controlled oscillator (VCO) whose frequency depends on the capacitance and can be varied by a control voltage
Implementation Method 2
at least one of the fields associated with these components (electric field or magnetic field) extends into the area to be monitored and is thus variable, such that a mass moves in this area
Implementation Method 3
the voltage applied to the input of the oscillating circuit is continuously adjusted in such a way that the frequency of the output signal of the oscillating electrical circuit is regulated to the frequency of the reference signal as the setpoint
Implementation Method 4
changes in capacitance or inductance influenced by moving masses
Implementation Method 5
changes in capacitance or inductance influenced by moving masses
Data Source
Figure 1
AI summary
The invention relates to an electronic sensor system for detecting movement or changes in the position of matter in a spatial area to be monitored, which comprises a VCO (2), a controller (3), a setpoint generator (4) and an indicator circuit (12), the frequency of the output signal of the VCO (2) is readjusted to the frequency of a reference signal (10) originating from the setpoint generator, and/or the phase shift of the oscillation of the VCO (2) relative to the oscillation of the reference signal is kept constant and the output signal (11) of the controller (3) an output variable (13) is extracted which, depending on the value, means a detection result or not, the oscillation frequency of the VCO (2) being able to be influenced by changing at least one capacitance and/or inductance (6), the size of which can be influenced in that mass is moved or changed position in the vicinity of a line (7). The frequency of the reference signal (10) alternates between at least two mutually different reference frequencies in a fixed time cycle.