Electronic Atomization Device With Alternating-Polarity Plasma Heating
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Solution Overview
Problem
Conventional plasmonic heating in electronic atomization devices suffers from poor spatial uniformity of heating and electrode damage due to temperature gradients and electrode ablation.
Innovation Solution
An electronic atomization device with a substrate and electrode assembly where an electric arc forms between first and second electrodes, with alternating polarity switching in a preset cycle to generate plasma for heating, using a power supply assembly to provide high-voltage alternating current and a control assembly to switch polarities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If direct current high-voltage power supply is used for plasmonic heating, then heating function is achieved, but spatial uniformity of heating deteriorates due to temperature gradient
Solution Approach 1:
The patent applies periodic action by alternating the polarity of the high-voltage electrode in a preset cycle during plasma discharge. This periodic polarity switching causes the plasma generation location to alternate between different regions, enabling the heating temperature to become more uniform across the entire heating element over time, thereby resolving the spatial temperature gradient issue caused by direct current.
Solution Approach 2:
The patent implements dynamics by transitioning from a static direct current system to a dynamic alternating polarity system. The high-voltage electrode's polarity changes periodically, making the plasma discharge location and heating distribution dynamic rather than fixed, which improves spatial uniformity while distributing thermal stress to protect the electrode.
2Power
If direct current high-voltage power supply is used, then plasma generation is achieved, but electrode damage occurs due to negative electrode bombardment by positive ions
Solution Approach 1:
By periodically switching the polarity of the high-voltage electrode, the patent ensures that neither electrode continuously serves as the negative electrode subjected to ion bombardment. This periodic reversal distributes the cumulative ion damage across both electrodes over time, significantly improving electrode durability while maintaining effective plasma generation.
Solution Approach 2:
The patent converts the harmful effect of ion bombardment on a single electrode into a beneficial distribution of thermal and mechanical stress across both electrodes. By alternating polarity, the previously concentrated damage mechanism is transformed into a balanced wear pattern that extends electrode life.
3Temperature
If high-temperature resistant electrode material is used, then electrode ablation is slowed, but electrode still becomes damaged and unable to discharge
Solution Approach 1:
The periodic polarity switching prevents any single electrode from continuously experiencing the full brunt of plasma discharge and ion bombardment. Even with high-temperature resistant materials, this alternating stress pattern significantly extends operational lifespan by distributing cumulative damage across both electrodes over time.
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
Improves spatial uniformity of heating and prevents electrode damage by alternating electrode polarities, ensuring uniform heating and efficient aerosol generation without electrode degradation.
Implementation Method 1
an electric arc is controlled to form between the first electrode and the second electrode so as to generate plasma
Implementation Method 2
an electric arc is controlled to form between the first electrode and the second electrode
Implementation Method 3
since there is a temperature gradient of the plasma from the high-voltage electrode to the low-voltage electrode in the discharging gap, the heating element has a gradual temperature gradient along the axial direction
Data Source
AI summary
An electronic atomization device include: a substrate, a heating cavity being formed in the substrate; and an electrode assembly including a first electrode and a second electrode, both the first electrode and the second electrode at least partially extending into the heating cavity. In the heating cavity, an electric arc is controlled to form between the first electrode and the second electrode so as to generate plasma. Negative and positive polarities of the first electrode and the second electrode are switched in a preset cycle.