Fluorescent lamp: Put some special gas into the tube, and apply phosphor on the tube wall of the tube. After the power is turned on, it will generate light due to the discharge. Fluorescent lamp: It does not contain infrared light, so its light is very gentle, does not hurt the eyes; because it does not contain hot wires, it is more energy efficient; it also emits a lot of beautiful and colored light. This is determined by the nature of the chemicals contained in the phosphor, such as magnesium tungstate, blue-white light, and pale red light coated with cadmium borate.
The filament tube is equipped with a filament at both ends, and the inner wall of the glass tube is coated with a uniform thin phosphor powder. After the tube is evacuated to a vacuum of 10-10 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 flux, resulting in 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, so that when the bimetal piece is opened and closed, the current of the inductance ballast is abrupt and a high voltage pulse is generated to be applied to both ends of the lamp tube.
When the fluorescent lamp is connected to the circuit, the glow discharge is started between the two electrodes of the starter, so that the bimetal is thermally expanded and contacts the static contact, so that the power source, the ballast, the filament and the starter form a closed loop, and the current The filament is preheated, and after 1-3 seconds of heating, the glow discharge between the two electrodes of the starter is extinguished, and the bimetal is cooled and disconnected from the static electrode, when the two electrodes are disconnected The current in the circuit suddenly disappears, so the ballast generates a high-voltage pulse, which is superimposed on the power supply and then applied to both ends of the lamp tube to ionize the inert gas in the lamp tube to cause arc discharge. During the normal illumination process, the town The self-inductance of the current device also acts to stabilize the current in the circuit.
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