Micropulse Bipolar Corona Ionizer for Static Neutralization
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Solution Overview
Problem
AC corona ionizers used for static charge neutralization suffer from high emitter contamination and ozone emission, which decrease ionization efficiency and pose health hazards.
Innovation Solution
A micro-pulse bipolar corona ionizer with an ion balance control circuit, spark surge suppressor, and corona activity circuit, utilizing alternating pulse trains with asymmetrical waveforms to generate bipolar ions with reduced ozone emission and emitter contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If AC corona ionizers are used for static charge neutralization, then ionization function is achieved, but ozone emission and emitter contamination increase
Solution Approach 1:
The patent applies periodic pulsed voltage instead of continuous AC voltage to generate ions in discrete micro-pulses. This periodic action allows ion generation to occur only during brief intervals when voltage exceeds the corona threshold, while remaining below the threshold during other intervals, thereby reducing cumulative ozone production while maintaining effective ionization during active periods
Solution Approach 2:
The patent employs asymmetrical waveforms where the voltage pulse has a rapid rise time to quickly exceed the corona threshold for ion generation, followed by a controlled decay that stays below the threshold. This asymmetrical time-profile separates the ionizing phase from the non-ionizing phase, enabling efficient ion production with minimized harmful byproduct formation
2Object-affected harmful factors
If AC corona ionizers are used for static charge neutralization, then ionization function is achieved, but emitter contamination rate increases
Solution Approach 1:
By using periodic micro-pulses rather than continuous voltage, the emitter is exposed to ionizing conditions only during brief intervals. This reduces the cumulative time the emitter surface is exposed to ambient particles and contaminants, thereby reducing contamination rate while maintaining ionization effectiveness during active pulse periods
Solution Approach 2:
The patent changes the voltage parameter dynamically by applying pulsed voltage that exceeds the corona threshold only during micro-pulse intervals. This parameter modulation allows the system to achieve ionization when needed while minimizing exposure to conditions that cause emitter contamination during non-pulse intervals
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 ozone emissions and emitter contamination, maintaining efficient ionization while ensuring ion balance, thus providing a safer and more effective method for static charge neutralization.
Implementation Method 1
These ionizing positive and negative voltage waveforms alternately create voltage gradients across the emitter and said reference electrode, generating by corona discharge an ion cloud that includes positive and negative ions
Implementation Method 2
The positive pulse train includes an ionizing positive voltage waveform, while the negative pulse train includes an ionizing negative voltage waveform
Data Source
Figure 1~3B
Figure 2
Figure 4A
AI summary
A solution for static charge neutralization that includes providing at least one pulse train pair (18) to an emitter (12) of an ionizer (10) is disclosed. The pulse train pair (18) is disposed to include a positive pulse train (30) and a negative pulse (32) train that alternate in sequence. The positive pulse train (30) includes an ionizing positive voltage waveform (64), while the negative pulse train (32) includes an ionizing negative voltage (84) waveform. These ionizing positive and negative voltage waveforms (64, 84) alternately create voltage gradients across the emitter (12) and a reference electrode (14) of the ionizer (10), generating by corona discharge an ion cloud (40) that includes positive (34) and negative ions (36).