In the fluorescent lamp circuit, if the starter is broken, what method is used to make the fluoresce

Unplug the bad starter and draw a wire from each end of its base, exposing the copper wire on the head.

Turn on the light, touch the copper wires on the two wires that lead out (the ends of the light should be reddish), and suddenly separate in about 1 second, and the light will turn on. If it doesn't light up, touch the copper wires on the two wires that lead out again, and suddenly separate them in about 1 second. It is not standard to do so, so you must pay attention to safety.

Fluorescent lamps, traditional fluorescent lamps, i.e., low-pressure mercury lamps, use low-pressure mercury vapor to release ultraviolet light when energized.

As a result, the phosphor emits visible light.

The principle of luminescence, so it belongs to the low-pressure arc discharge light source. In 1974, Philips in the Netherlands was the first to successfully develop a phosphor that can emit red, green and blue light that is sensitive to the human eye. Three primary colors (also known as three primary colors.

The development and application of phosphors is an important milestone in the history of fluorescent lamps.

You can do it manually to turn on the sunlight.

1. Short the two electrodes of the starter with wires. Insert the starter holder and quickly dial it down when both ends of the lamp are red.

2. Insert the starter holder with insulating pliers (needle-nose pliers), short the electrode, and quickly dial it when both ends of the lamp are red.

The operation is dangerous, and a starter is not worth a few dollars, so you can change it.

Hello, the current passes through the ballast, the starter contact pole and the filaments at both ends to form a path. The filament is quickly heated by an electric current, emitting a large number of electrons. At this time, due to the closure of the two poles of the starter, the voltage between the two poles is zero, the glow discharge disappears, and the temperature in the tube decreases; The bimetal sheet automatically resets, and the poles are disconnected.

At the moment when the poles are disconnected, the circuit current is suddenly cut off, and the ballast generates a large self-induced electromotive force, which acts on both ends of the tube after superimposing with the power supply voltage. A large number of electrons emitted by the filament when heated move from the low potential end to the high potential end at great speed under the action of high voltage at both ends of the lamp. In the process of accelerating motion, the argon molecules in the tube collide, causing them to ionize rapidly.

Argon ionizes to generate heat, and the heat causes the mercury to produce vapor, which is then ionized and emits intense ultraviolet light. When excited by ultraviolet light, the phosphors inside the tube wall emit near-white visible light.

There is no way to start without a brightener unless the circuit is modified.

It can be replaced with a pushbutton switch, which functions the same as the starter. The role of the starter in the fluorescent lamp is equivalent to the role of the switch, the fluorescent lamp starts at the moment of powering on, and then the starter is naturally disconnected; Use a button switch instead, turn off as soon as the switch is turned on, and the fluorescent light will start normally.

The principle of fluorescent lamp startup is that when the switch is turned on, the power supply voltage is immediately added to the two poles of the starter through the ballast and the lamp filament. A voltage of 220 volts immediately ionizes the inert gas of the starter, producing a glow discharge.

When the switch is closed and the power supply is turned on, the lamp has not yet been discharged, and the power supply voltage is added to the two bimetallic contacts in the starter through the filament, so that the neon tube produces glow discharge and heating, and the two contacts are turned on, so the current passes through the filament at both ends of the ballast and the lamp, so that the filament heats up and emits electrons.

At this time, the neon tube is short-circuited by the bimetallic contact to stop the glow discharge, and the bimetallic contact is also separated due to the decrease in temperature, and at this moment, the ballast generates a fairly high self-induced electromotive force. It is connected in series with the power supply voltage and added to both ends of the lamp to cause fox discharge, so that the fluorescent lamp is lit.

This is because the operation of "shorting it with a wire and then disconnecting it quickly" is actually the same as that of a starter.

Although this operation can also make the fluorescent lamp light, it has a certain danger and is easy to cause a short circuit or electric shock accident.

The working principle of the traditional old-fashioned) starter:

After powering on, the discharge tube in the starter is turned on, and its heat prompts the bimetal sheet to open and close, so that the alternating current passes through the ballast, filament and bimetal switch to heat the filament, and the bimetal sheet closes to extinguish the starter discharge tube.

After losing heat**, the bimetal sheet will be disconnected again, and the alternating current in the circuit will send a transient high voltage due to the self-inductance of the ballast, which will be loaded into the fluorescent tube connected in series with the ballast and ignited.

The solution to the damage of the starter erection is erected

1. Directly replace the new one with the same lighter;

2. Replace the electronic starter (more durable than the traditional old starter);

3. Use electronic ballasts that are free of starters;

4. Replace it with LED energy-saving fluorescent tube (no need to use starter and ballast).

Fluorescent lamps without starters use resonant inductors. The resonant inductor (i.e., the small core or transformer) acts as the inductor ballast, the resonant capacitor, (the green capacitor connected in parallel at both ends of the lamp).

Start the working process: after the circuit is turned on, the 220 AC mains is filtered by rectification to form a DC voltage of about 300 volts, which is composed of a self-excited bridge push-pull output circuit by two switching power tube resistor capacitors and small magnetic rings, and the output is a voltage of about 25-40 kHz through the resonant inductance through the filament at both ends of the lamp (because the gas in the lamp is not ionized at some times, so it can be regarded as an open circuit), and the gas in the lamp tube begins to glow by the LC resonant circuit with high voltage. Because the gas in the lamp ionizes and emits light, a current loop is formed, and the resonance condition is destroyed, so the capacitor is only used to maintain the AC circuit of the switching circuit (it cannot be disconnected, otherwise the lamp will go out). Due to the high circuit and frequency, the start-up process is completed in an instant.

This is also the disadvantage of this type of ballast, which cannot effectively preheat the lamp filament, commonly known as a pull.

The function of the starter is to preheat the fluorescent lamp filament and increase the voltage at both ends of the lamp to light the automatic switch of the lamp.

The starter is by using the mercury vapor inside the high-voltage conduction lamp, so that the mercury vapor in the lamp is turned on and works normally, due to the negative resistance characteristics of the fluorescent lamp, the voltage at both ends is lower than the ionization voltage of the starter discharge tube, and the bimetal sheet of the discharge tube is separated and kept in a disconnected state.

There is also a capacitor in the starter, which is connected in parallel with the neon bubble, which is used to absorb the harmonics generated by the glow discharge, so as not to affect the normal operation of TV, radio, audio, mobile phone and other equipment. It can also make the dynamic and static contacts not spark when separating, so as not to burn out the contacts. But without capacitors, the starter will work as usual.

Only fluorescent lamps that use inductive ballasts use starters, which are used to produce instantaneous self-inductive high pressure to penetrate the gas inside the lamp (a low-pressure inert gas containing mercury vapor) after the fluorescent lamp is preheated, so that the lamp can be activated. The specific process is as follows: when the fluorescent lamp is just energized, the gas inside the lamp is in a high impedance state without ionization, and no current flows through the lamp at this time, so the ballast coil (L in the figure) has no partial voltage, and the voltage of 220V is directly added to both ends of the lamp, but the voltage of 220V is not enough to start the lamp, so the lamp does not emit light at this time.

However, please note that the starter connected in series between the two filaments of the lamp is also added with a voltage of 220V, and the neon bubble inside the starter can be glowed at about 150V, so at this time, the starter begins to discharge and emits blue-purple light (the starter with a transparent plastic shell can see that the starter will flash several times when it is just energized), in this process, the neon bubble temperature rises, the internal bimetal sheet is heated and deformed, and it collides with the fixed contact for about 2 seconds, and after the two contact, the starter is in a short-circuit state, At this time, the current flows back through the ballast-filament-starter-filament to form a loop, and the current is very large (the filaments at both ends of the lamp will emit orange-yellow light). After the starter is short-circuited, the glow discharge process stops, and it no longer heats up, the bimetal sheet cools down and returns to its original shape, at the moment when the bimetal sheet is separated from the metal rod, the starter circuit is disconnected, and the current in the circuit is instantaneously reduced, but because the ballast L is actually an iron core inductor, the inductor produces a huge self-inductive electromotive force resistance in the process of rapid current reduction, and the process of current reduction (capacitance voltage can not be abrupt, inductance current can not be abrupt), this self-inductance high voltage can reach thousands of volts, It will immediately penetrate the gas inside the lamp, after the lamp is broken down and ionized, the pressure drop of the lamp decreases rapidly, and the current flows through the inside of the lamp (before the glow is flowed through the filament but not through the inside of the lamp), by the current limiting effect of the ballast, the voltage at both ends of the lamp drops to about 100V, the starter no longer works due to insufficient voltage, and the lamp enters a normal luminous state. After the light is turned on, the starter no longer functions and will not go out even if the lamp is removed.

Fluorescent lamp, in the initial stage of igniting the lamp, needs a high-voltage pulse of more than 400V, once the lamp is ignited, the voltage to maintain normal operation is only about 60 90V, and the power supply is AC220V, so it is necessary to use a ballast and a starter to provide a high-voltage pulse when the lamp is lit, and the ballast shares a part of the voltage during normal operation.

The starter is mainly composed of bimetal sheets, the gap between the contact points is small, and when the circuit is turned on, the supply voltage is enough to cause a glow discharge through the filling gas. Due to the different thermal expansion of the two metals, the slowly heated contact pieces produce relative bending, and after a second or two, when the contact pieces touch each other, a series circuit is formed through the ballast and the filament, so that a fairly strong current (preheating current) heats the filament rapidly. After the metal sheet is contacted, the glow discharge is extinguished, the metal sheet begins to cool, the contact point pops open, and the series circuit is interrupted, because it is a high inductance circuit, so within 1ms, a high-voltage pulse is generated between the two filaments of the lamp, and the lamp is ignited.

The ballast generates instantaneous high voltage when starting, and plays the role of step-down and current limiting during normal operation. The starter acts as an automatic switch.

Traditional fluorescent lamps all need a starter, but 3G fluorescent lamps don't need this.

There are two scenarios:

1.After powering on, the same as when there is no power, the filament is not lit, and the starter is not lit, in this case, the starter is in poor contact, and it will be connected instantly, because the starter is useless after the lamp is started, so even if the connection of the starter is disconnected, there is no phenomenon, but it cannot be started next time.

2.After powering on, the filament is red but cannot be started, which means that the starter has been damaged (internal short circuit), and the instantaneous contact of the starter is poor after twisting, and the ballasts generate self-inductive high pressure to start the lamp at the moment when the line is disconnected.

The starter is broken, and the internal common pass cannot be disconnected.

It may be caused by poor contact between the light stand and the starter.

The starter is broken:

The two corners of the normal starter are normally impassable, but now they are connected.

There is a small capacitor in the starter, which breaks down. In the case that the two corners of the starter are not connected, the capacitor is broken, and the capacitor can be cut off in case of emergency.

What happens when the light is turned at a certain angle after installing the starter?

At this time, one of the four legs of the lamp does not touch (disconnects) with the lamp base, which has the same effect as removing the starter.

The fluorescent lamp is extinguished when the starter is installed, and the U-shaped piece of the starter cannot be automatically retracted, so that the branch is in a conductive state, and a qualified one can be replaced.