A Brief Overview of the Principle of Anti-static Equipment
The working principle of anti-static equipment is as follows. It consists of a high-voltage power generator and a discharge electrode (usually made into an ion needle). Through high-voltage corona discharge at the tip, air is ionized into a large number of positive and negative ions. Then, wind is used to blow these ions onto the surface of the object to neutralize static electricity, or the anti-static equipment is directly placed near the object's surface to neutralize static electricity.
Anti-static equipment is mainly divided into the following types:
1. AC Corona Discharge Products
The AC high-voltage generator boosts the 220V input voltage to over 4KV. The discharge electrode alternates between positive and negative voltages at a frequency of 50Hz. A strong electric field is generated between the discharge electrode and the grounding electrode, ionizing air molecules. The tip of the discharge electrode alternately generates positive and negative ions. When the surface of the charged object is at a positive potential, the negative ions neutralize it; conversely, if the surface is at a negative potential, the positive ions neutralize it. AC corona discharge products must be grounded to function properly, but some positive and negative ions will be conducted to the ground due to grounding. However, the structure is simple, and the balance of positive and negative ions is good.
2. DC Corona Discharge Products
The DC high-voltage generator amplifies the 220V input voltage and outputs positive and negative voltages respectively. A strong electric field is generated between the positive and negative discharge electrodes, ionizing air molecules. Positive ions are generated at the tip of the positive discharge electrode, and negative ions are generated at the tip of the negative discharge electrode. The simultaneous generation of positive and negative ions neutralizes static electricity on the surface of an object. When the surface of the charged object is at a positive potential, the negative ions neutralize it; conversely, if the surface is at a negative potential, the positive ions neutralize it. DC corona discharge products can generate positive and negative ions without grounding, and the amount of positive and negative ions acting on the surface of the object is sufficient, resulting in very rapid static neutralization.
3. Pulsed DC Corona Discharge Products
The pulsed DC high-voltage generator amplifies the 220V input voltage and outputs positive and negative voltages alternately at a cycle of 4-6 seconds, thereby alternately generating positive and negative ions. When the surface of the charged object is at a positive potential, the negative ions neutralize it; conversely, if the surface is at a negative potential, the positive ions neutralize it. Because the switching cycle of pulsed DC positive and negative ions is 200-300 times longer than that of power frequency AC static eliminators, there is no self-neutralization of positive and negative ions. Furthermore, there is no need for grounding to avoid ion loss. The switching cycle can be adjusted according to the distance to the object requiring static elimination; a longer switching cycle for longer distances and a shorter cycle for shorter distances. Pulsed DC static eliminators can achieve a long effective distance even without a fan.