The main features of LED lights
There is a filament at each end of the fluorescent lamp. The tube is filled with a small amount of argon and thin mercury vapor. The inner wall of the tube is coated with phosphor powder. When the gas between the two filaments conducts electricity, it emits ultraviolet light, which makes the phosphor powder soft. Visible light.
Fluorescent lamp working characteristics: A high voltage is required when the lamp starts to ignite, and only a small current is allowed to pass during normal illumination. At this time, the voltage across the lamp is lower than the power supply voltage.
The fluorescent tube is equipped with a filament at both ends, and the inner wall of the glass tube is coated with a uniform thin fluorescent powder. After the tube is evacuated to a vacuum of 10-3-10-4 mmHg, a small amount of inert gas is charged, and a small amount of liquid mercury is also injected. . An inductive ballast is a core inductive coil. The nature of the inductor is that when the current in the coil changes, the flux will cause a change in the magnetic flux, thereby generating an induced electromotive force whose direction is opposite to the direction of the current, thus hindering The current changes.
The starter acts as a switch in the circuit. It is formed by a helium discharge tube connected in parallel with a capacitor. The function of the capacitor is to eliminate the electromagnetic interference to the power supply and form an oscillating circuit with the ballast to increase the starting pulse voltage amplitude. One electrode of the discharge tube is composed of a bimetal piece, and is heated by the bubble discharge to cause the bimetal piece to open and close, causing a sudden change in the current of the inductor ballast and generating a high voltage pulse applied to both ends of the lamp tube.