Do fluorescent lamps have starters now? What is the principle of fluorescent lamp?
Fluorescent lamps are also called fluorescent lamps. Traditional fluorescent lamps are low-pressure mercury lamps. They use low-pressure mercury vapor to release ultraviolet rays after being energized, so that the fluorescent powder emits visible light. Therefore, it is a low-pressure arc discharge light source. But today's are basically called fluorescent lamps, so do fluorescent lamps now have a starter? What is the principle of fluorescent lamp? Many people are still quite curious. Let’s take a look at Benwei light.
Do fluorescent lamps have starters now?
The function of the starter is to instantaneously short-circuit, causing the inductance to generate a high voltage, breaking down the gas in the tube, and allowing electrons to pass through. Therefore, it can only work if it is used in conjunction with an inductor. The starter is a device that uses preheating to increase the voltage at both ends of the lamp to light up the lamp. The starter capacitor is one of the expansion parts of the starter. The function of the starter capacitor is obvious, mainly for protection. effect.
It mainly plays the role of heating the filament, and the heated filament can be fully ignited under the source voltage of 310V. If the filament is hot enough, 200V can also light up a 40W fluorescent lamp. The boosting effect is also present, but not the main one.
The starter is used in the circuit of the inductive ballast fluorescent lamp to act as an automatic switch: the lamp current flows through the starter, and the neon bulb lights up, causing the bimetallic sheet to bend after heating, and the circuit is automatically disconnected, and the current flows in the inductor. When a sudden interruption occurs, a higher self-inductance potential is generated, which will light up the lamp after being superimposed with an external power source. After the lamp tube is lit, the current passes through the lamp tube and no longer passes through the starter. At this time, removing the starter will not affect the lighting of the lamp.
The starter is suitable for a wide range of lamp power, and can usually be used in 8-40 watt fluorescent lamps. In the electronic ballast fluorescent lamp circuit, the starter is not used.
Instead of a starter, an electronic ballast is used to generate instantaneous high voltage by electronic circuits. It is necessary to maintain the original circuit of the fluorescent lamp, and lead out the two ends of the original starter, and connect a normally-open type non-lock key switch as the "starter" button (but the inductive ballast and circuit must be retained). When you need to turn on the lamp, first turn on the power with the original power switch (on), press the "Enlight" button, and then release it. The ballast will be turned on/off due to the inductance, which will generate instantaneous high voltage and make the lamp tube The gas was penetrated and ignited.
Electronic components can be used to replace the rectifier, which can also make the fluorescent lamp light up, and the starter can be omitted, but the withstand voltage of the electronic components should be higher (above the peak voltage), and better heat dissipation can extend the life.
What is the principle of fluorescent lamp?
The inert gas in the lamp tube is activated with instant high pressure and the phosphor on the tube wall is activated to emit light. The function of the ballast in the picture is to generate high-voltage self-induced electromotive force at the moment when the starter is turned on and off, and the filament in the lamp tube is used to heat the inert gas. The voltage at both ends of the starter is greater than 65V when the circuit is first connected to the power supply. The neon gas in the starter bulb generates heat, the U-shaped bimetallic sheet is heated and straightened, and the two points a and b are connected to the filament to generate heat. After the two ends of b are connected, the voltage in the bubble disappears, the U-shaped bimetallic sheet becomes cold and retracts, and the contact is disconnected. When the starter is disconnected, the ballast generates instantaneous high voltage to activate the fluorescent tube to emit light. After the lamp tube emits light, the voltage at both ends of the starter is maintained below 65V and no longer operates. Short-circuiting the starter base with a wire instantaneously simulates the working process of the starter.
The above is an explanation of the knowledge of whether there is a starter for fluorescent lamps and what is the principle of fluorescent lamps. I believe you should have more understanding after reading it. The content is for your reference only, and I hope it can be helpful to you.
