Proximity Detection Shield Electrode Frequency Hopping
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Solution Overview
Problem
Existing detection devices face interference issues due to frequency mismatch between the periodically oscillating potential provided to the shield electrode and external periodic electrical changes.
Innovation Solution
A detection device is designed with a detector comprising first and second electrodes, a detection circuit, a power circuit generating a square wave, and a filter with a low-pass filter circuit and digital potentiometer. The filter adjusts the frequency of the periodically oscillating potential based on the electric resistance value of the digital potentiometer, allowing for frequency hopping to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a periodically oscillating potential is provided to the shield electrode, then the detection device can reduce noise and improve detection accuracy, but the frequency of the periodically oscillating potential may interfere with external periodically oscillating potential
Solution Approach 1:
The patent implements frequency hopping capability that allows the detection device to dynamically change the frequency of the periodically oscillating potential provided to the shield electrode. This dynamic frequency adjustment enables the system to avoid fixed frequency interference from external sources while maintaining noise reduction benefits, thereby resolving the contradiction between improving detection accuracy and avoiding interference.
2Device complexity
If the frequency of the periodically oscillating potential is fixed, then the circuit design is simpler, but the detection device cannot avoid interference from external periodic signals
Solution Approach 1:
The patent changes the frequency parameter of the periodically oscillating potential from a fixed value to a variable that can be dynamically adjusted through frequency hopping. This parameter change allows the detection device to select optimal frequencies that avoid external interference while maintaining relatively simple circuit implementation through the use of a digital potentiometer and low-pass filter circuit.
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 solution effectively reduces interference by dynamically changing the frequency of the square wave and the periodically oscillating potential, enhancing the detection device's ability to accurately detect proximity without external interference.
Implementation Method 1
The filter includes a low-pass filter circuit and a digital potentiometer
Implementation Method 2
The filter is provided capable of changing the frequency of the periodically oscillating potential in accordance with an electric resistance value of the digital potentiometer
Implementation Method 3
a detection circuit configured to detect proximity of an external object to the detector based on electric change at the first electrodes
Data Source
AI summary
A detection device includes: a detector including first electrodes and second electrodes disposed around a the first electrodes; a detection circuit configured to detect proximity of an external object to the detector; a power circuit configured to generate a square wave; and a filter that is coupled to the power circuit through an isolator and configured to receive the square wave transmitted through the isolator. The filter includes a low-pass filter circuit and a digital potentiometer. A periodically oscillating potential based on output from the filter is provided as a reference potential of the power circuit and provided to the second electrodes. A reference potential of the filter is a fixed potential. The power circuit can change the frequency of the generated square wave. The filter can change the frequency of the periodically oscillating potential in accordance with an electric resistance value of the digital potentiometer.