Static Eliminator Ion Balance Control With Dual Current Detection
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Solution Overview
Problem
Existing static eliminators face challenges in maintaining both long-term and short-term ion balance stability due to low responsiveness in feedback control caused by the large capacitance of the earth connection, leading to unstable ion generation.
Innovation Solution
A static eliminator with a ground electrode and a detection electrode, along with separate detection circuits, allows for feedback control of ion currents to achieve both long-term and short-term ion balance by detecting and adjusting ion currents at different points, ensuring balanced ion generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If feedback control is performed based on current between static eliminator and earth, then long-term ion balance is achieved, but short-term ion balance becomes unstable due to low responsiveness
Solution Approach 1:
A detection electrode is introduced as an intermediary between the ion generator and the earth connection. This detection electrode captures ion currents before they reach the earth, providing a measurement point that does not suffer from the earth's large capacitance. The detected signal is then used for feedback control, enabling both long-term stability (through feedback control) and short-term responsiveness (through the intermediary detection electrode that avoids earth's capacitance bottleneck).
2Device complexity
If single detection point is used for ion balance control, then device complexity is reduced, but both long-term and short-term ion balance cannot be effectively controlled
Solution Approach 1:
The detection function is segmented into two distinct detection circuits: a first detection circuit that detects ion currents at the earth connection point for long-term balance control, and a second detection circuit that detects ion currents at the detection electrode for short-term balance control. This segmentation allows each circuit to specialize in a specific time scale and control objective, effectively managing both long-term and short-term ion balance stability without excessive complexity.
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 controls both long-term and short-term ion balance, stabilizing ion generation for consistent static elimination.
Implementation Method 1
an ion generator that generates a corona discharge in response to application of a positive polarity high voltage to generate positive ions, and generates a corona discharge in response to application of a negative polarity high voltage to generate negative ions
Data Source
AI summary
To appropriately control both long-term ion balance and short-term ion balance. A current flowing between an earth and a static eliminator via a ground electrode is detected, and feedback control is executed on a negative polarity high voltage power supply such that the current becomes a target current. Furthermore, a front wire mesh functioning as a detection electrode different from the ground electrode is arranged at a position where positive ions and negative ions generated by an electrode needle and an electrode needle arrive. Then, a current generated by the positive ions and the negative ions arriving at the front wire mesh is detected, and feedback control is executed on the negative polarity high voltage power supply such that the current becomes a target current.