Water Level Sensor DC Component Removal via Phase Alternation
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Solution Overview
Problem
Conventional water level detection apparatuses in boilers often include a DC voltage component in their AC output signals, leading to electrolysis and electrical corrosion of the water level sensor.
Innovation Solution
A water level detection apparatus that uses two direct current control signals with opposite phases, alternately output from a micom, to generate an alternating current water level detection signal, preventing DC components from reaching the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AC-AC conversion scheme is used to supply voltage to water level sensor, then water level detection function is achieved, but DC voltage component causes electrolysis and electrical corrosion of the sensor
Solution Approach 1:
The patent extracts and removes the DC voltage component from the AC output signal through a capacitor connected in parallel with the water level sensor. This capacitor selectively blocks DC while allowing AC to pass, thereby eliminating the harmful DC component that causes electrolysis and electrical corrosion, while preserving the necessary AC detection function.
Solution Approach 2:
The patent introduces a capacitor as an intermediary element between the AC-AC conversion circuit and the water level sensor. This capacitor acts as a mediator that filters out the DC voltage component from the signal, allowing the AC component to reach the sensor without causing electrical corrosion.
2Ease of operation
If DC control signals are used to control water level, then control function is achieved, but DC component in output signal causes electrolysis
Solution Approach 1:
The patent extracts the harmful DC component from the control signal output by using a capacitor in parallel with the water level sensor. This capacitor removes the DC voltage component that would otherwise cause electrolysis, while allowing the AC control function to operate effectively.
Solution Approach 2:
The patent changes the parameter of the control signal from pure DC to AC by using capacitive coupling. This parameter change transforms the signal characteristics to eliminate DC component while maintaining control functionality, thereby preventing electrolysis.
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 solution effectively prevents electrical corrosion of the water level sensor by converting DC current to AC only for a predetermined time, ensuring the durability of the sensor.
Implementation Method 1
a transformation unit which transforms the DC voltage into an AC voltage and outputs an AC water level monitoring signal
Implementation Method 2
a capacitor connected in parallel with the water level sensor to block a DC component of an AC component of the AC water level monitoring signal
Data Source
AI summary
The present invention relates to an apparatus and a method for detecting a water level, which are capable of generating a water level detection signal which is alternating current output to a water level detection sensor by using two direct current control signals alternately output from a micom.