Find the information of electronic ballast, the role of electronic ballast

The role of the ballast is mainly to generate high pressure by self-induction, and now many lamps and lanterns will be installed with ballasts, which mainly use its own role, and then the lamps and lanterns change, and then play the role of lighting.

The function of the ballast is to convert the 220V AC power to a voltage suitable for the operation of the lamp, similar to the power adapter.

The ballast is the equipment that plays the role of limiting the current and produces the instantaneous high voltage on the fluorescent lamp, it is made of winding enameled wire on the iron core made of silicon steel, such a coil with the iron core, when the power is turned off in an instant, it will self-induce high voltage, and it is added to the electrodes (filaments) at both ends of the fluorescent tube.

From the name, I know that it is used for ballast, that is, to limit the current, of course, when it starts, it is also responsible for giving the lamp a high voltage!

Provides high-voltage starting to the fluorescent tube.

Electronic ballasts use semiconductor electronic components to convert DC or low-frequency AC voltage into high-frequency AC voltage, and drive low-pressure gas discharge lamps (germicidal lamps), halogen tungsten lamps and other light sources to work as electronic control devices. The most widely used are electronic ballasts for fluorescent lamps.

Electronic ballast generally uses AC DC AC mode to make HID work at high frequency (a few kHz to several hundred kHz), so that a small inductance can be used inside the electronic ballast to make HID work stably, or use control technology to make the lamp current or lamp power in a constant state, to achieve the effect of ballast, usually the electronic ballast also has a power factor correction function, which improves the power factor at the input end and reduces the pollution to the power grid. At present, the most common electronic ballast is the structure of PFC rectification + half-bridge resonance.

Electronic ballasts are divided into: electronic ballasts for fluorescent lamps, electronic ballasts for high-pressure sodium lamps, and electronic ballasts for metal halide lamps. Due to the use of modern soft-switching inverter technology and advanced active power factor correction technology and electronic filtering measures, it has good electromagnetic compatibility and reduces the self-loss of the ballast.

The role of electronic ballasts.

Electronic ballasts are used for gas discharge electric light sources (such as household fluorescent lamps), they are emitted by the principle of gas discharge, and gas discharge is characterized by the need for a high voltage (thousands of volts) to make it break down and start working, once the breakdown, its resistance will become very low, if it is not restricted, there will be a large current flowing through the electrode and it will be burned.

The function of the electronic ballast is to generate a high voltage when the lamp is not emitting light to make it break down and start to work, and then limit the current through it at the rated value so that it can emit light normally.

Distinguish between good and bad electronic ballasts.

Remove the glitter, disconnect the power supply, and test both ends of the ballast. If the ballast is older inductive, the inductive type can be used to test whether the coil is burned out in this way. This old-fashioned ballast is broken, usually because the coil burns out, resulting in no voltage at both ends of the lamp, which will not cause the lamp to burn out.

There are many situations with electronic ballasts.

The resistance of the three ballasts can be measured separately according to the method described above to see if there is a big difference, so as to judge whether the ballast is damaged. You can also change the glow starter to see if the glow starter that burns can not be disconnected and is always in the channel state. In short, use the substitution method.

Electronic ballast principle.

The power supply becomes a DC power supply after passing through a radio frequency interference (RFI) filter, full-wave rectification, and a passive (or active) power factor corrector (PPFC or APFC). Through the DC AC converter, output 20K-100kHz high-frequency AC power supply, add to the LC series resonant circuit connected with the lamp to heat the filament, and at the same time generate resonant high voltage on the capacitor, add it to both ends of the lamp, but make the lamp"Discharge"becomes"Conduction"state, and then enter the luminous state, at this time, the high-frequency inductor plays the role of limiting the increase of current to ensure that the lamp tube obtains the lamp voltage and lamp current required for normal operation.

The old-fashioned ballast is just an inductor coil with an iron core, and the core material is selenium steel sheets.

The coil is made of enameled wire, and the new type of ballast is electronic, high-frequency oscillating circuit composed of electronic components.

Generally speaking, it is a current limiter, which has two functions in the fluorescent lamp circuit, one is to generate a high voltage when the lamp is started, so that the lamp can be ignited smoothly, and the other is to control the current flowing through the lamp after the lamp is ignited.

Function. The ballast is a necessary electrical component for the discharge of light-emitting devices, which can generate instantaneous high voltage when the starter is disconnected, so that the light-emitting device starts to emit light, and then limit the current to control it within the rated range of the light-emitting device.

Energy conservation. The electronic ballast of the lamp uses a frequency of 20 60kHz to supply the lamp, so that the light efficiency of the lamp is about 10% higher than that of the power frequency (according to the length of the 4-foot lamp), and its own power consumption is low, so that the total input power of the lamp is reduced by about 20%, which has a better energy-saving effect.

2.The glow is more stable.

It is conducive to improving visual resolution and improving efficacy; Reduce visual fatigue during continuous work and help protect eyesight.

3.The starting point is more reliable.

After preheating the lamp, the first starting point is successful, avoiding multiple starting points.

4.High power factor.

Fluorescent lamps above 25W that meet the national standard have a higher power factor than that. However, it should be noted that the harmonic limit specified by the national standard for lamps below 25W is so high that its power factor drops to.

5.Stabilize input power and output luminous flux.

High-quality products have good voltage stabilization performance, and can still maintain the constant power of the light source and stabilize the illuminance when the power supply and voltage deviation are large, which is conducive to energy saving.

6.Extend lamp life.

Factors such as constant power and lamp current reduction of high-quality products, as well as reliable starting point, can extend lamp life.

7.Low noise.

The noise of high-quality electronic ballasts can reach less than 35db, and people do not feel the noise.

8.Can be dimmed.

For places that require dimming, such as places that originally use incandescent lamps or tungsten halogen lamps for dimming, they are replaced by high-efficiency fluorescent lamps with dimmable electronic ballast alarms, which can achieve a wide range of dimming at 2% and 100%.

1. Electronic ballasts cannot be universal. The working current of the ballast of different power is different, and it cannot be used with the lamp of different power, otherwise it will seriously affect the life of the lamp and the brightness of the lamp.

2. Electronic ballast is a kind of ballast, which refers to the electronic equipment that uses electronic technology to drive the electric light source to produce the required lighting. The counterpart to this is an inductive ballast (or ballast).

3. Modern fluorescent lamps are more and more using electronic ballasts, which are light and compact, and can even integrate electronic ballasts with lamps, etc., at the same time, electronic ballasts can usually have the function of starter, so a separate starter can be omitted.

The choice of ballast needs to be selected according to the power of the lamp, that is, the 40W lamp can only choose the 40W ballast, and the electronic ballast is preferred, the brand is larger, and the quality is ***. In fact, the lamps have been gradually eliminated, and it is better to choose LED lights.

Ballast selection principle:

Self-ballasted fluorescent lamps should be equipped with electronic ballasts.

Straight tubular fluorescent lamps should be equipped with electronic ballasts or energy-saving inductive ballasts, high-pressure sodium lamps, and metal halide lamps should be equipped with energy-saving inductive ballasts; In places with large voltage deviations, constant power ballasts should be used; For those with less power, electronic ballasts can be used.

The ballasts of fluorescent lamps and high-intensity gas discharge lamps are divided into inductive ballasts and electronic ballasts2Selection of ballast:

1) It is advisable to select tubular fluorescent lamp ballasts according to energy efficiency limit values and energy-saving evaluation values, 2) high-pressure sodium lamp ballasts.

a It is advisable to select high-pressure sodium lamp ballasts according to the energy efficiency limit value and energy-saving evaluation value b For places with dimming requirements, such as night lighting on urban roads, energy-saving ballasts with dual power output can be used, and power selection can be carried out with timers to meet the illuminance requirements of different periods.

3) It is advisable to select metal halide lamp ballasts according to the energy efficiency level

However, when it is actually used, it is often different from the calculation, and the wire diameter will generally be larger than the calculation according to the required temperature rise and the overall structural adjustment. Because the formula is an empirical formula, more than ten years ago, the standard is a little different. 2.

The overall impedance of the inductor ballast is called the impedance, and the resistance is only the internal coil, and the overall impedance is in the national standard and the GB19510 series. 3.The manufacturer is produced according to the wattage frequency, not after the production to determine how many watts this is, if it is accidentally confused and can't tell, then test it according to the standard, each model has its own test voltage, according to the current size.

For example, the same 220V voltage under the 250W sodium lamp ballast, a 50Hz, a 60Hz, their test voltage is 180V, if the test, the power frequency used is 50Hz, then the standard current of the 50Hz ballast is about 3A 5%, and the current tested at 60Hz is smaller, estimated at about that, then we can judge that 3A is the 50Hz 250W high-pressure sodium lamp ballast. Inductive ballasts of the same power and different frequencies have slightly different internal structures, and manufacturers will generally reduce the number of windings to meet the current requirements of 60Hz, so the difference between them is that the number of windings of 60Hz will be a little less than that of 50Hz. The two of them are not recommended to be universal, because if the 50Hz is used in the 60Hz power supply, the lamp power will be insufficient, which will seriously affect the luminous flux and affect the lamp life, if the 60Hz is used in the 50Hz power supply, the current generated will be much greater than the standard current, and the temperature will exceed the limit, causing the inductance ballast to burn out.

4.The instantaneous current is large, but the time is short, the temperature does not rise, and the enameled wire is burned because of the poor insulation performance after the temperature is high, not caused by the large current in a short period of time (of course, if the enameled wire is accidentally scratched during production, the instantaneous high-voltage chamber can break through the ballast). The insulation layer of the outer layer of enameled wire is 130 degrees Celsius, and the better ones are 150 degrees, 180 degrees, 200 degrees, 220 degrees, etc.

Instantaneously high voltage is generated, so that the gas inside the lamp is penetrated between the two poles, and the power is applied after the breakdown, and then the light is turned on. Even if it is a fluorescent lamp, his filament is very temperature-resistant and will not burn out. 5.

The capacitance size is simply calculated as 10 times the standard current of the lamp, such as a 250W high-pressure sodium lamp, the standard current is 3A, then his compensation capacitance is 30 microfaram, of course, the actual calculation is very complicated, generally this is the match. 6.The rest don't understand very well, I'm sorry

The power of the ballast is equal to or greater than the power of the lamp. The inductor ballast has poor starting performance, strong overload capacity, and high power consumption. The electronic ballast has good starting performance, poor overload capacity, and low power consumption.

Ballast resistor is a fluorescent lamp that plays a role in limiting the current and generating instantaneous high voltage equipment, it is made of enameled wire wrapped on the iron core made of silicon steel, such a coil with an iron core, when the power is turned on and off instantaneously, it will self-induce high voltage, and it is added to the electrodes (filaments) at both ends of the fluorescent tube. This action is carried out alternately, when the starter (jumping bubble) is closed, the filament of the lamp is turned on and heated by the current limiting of the ballast; When the starter is open, the ballast will induce high pressure to be added to the filament at both ends of the lamp, and the filament emits electrons to bombard the fluorescent powder on the wall of the tube. When the lamp emits light normally, the internal resistance becomes smaller, and the starter always maintains an open circuit state, so that the current can stably pass through the lamp and the ballast, so that the lamp emits light normally.

The ballast is the equipment that plays the role of limiting the current and produces the instantaneous high voltage on the fluorescent lamp, it is made of winding enameled wire on the iron core made of silicon steel, such a coil with the iron core, when the power is turned off in an instant, it will self-induce high voltage, and it is added to the electrodes (filaments) at both ends of the fluorescent tube. Ballasts are divided into electronic ballasts and inductive ballasts.

The function of the ballast is twofold: one is to generate high voltage at the moment when the ignitor disconnects the fluorescent lamp circuit, which penetrates the mercury vapor circuit in the fluorescent lamp tube and makes the filament circuit conductive; Second, the self-inductive electromotive force in the ballast hinders the change of alternating current so that the current flowing through the lamp is not excessive.

The ballast is not a starter, and the ballast and the starter are the main components of the fluorescent lamp, and the working principle of the ballast is self-induction (self-inductive electromotive force) to increase the voltage at both ends of the lamp, so that the mercury vapor (mercury) in the lamp ionizes the electrons on the inner wall of the lamp, so that the fluorescent substances on the inner wall of the lamp emit light.

There is a physical presence in the second year of high school, which is used to limit excessive current, and can make the lamp have a stable current in a short time! There are two types: inductive and high-frequency electronics. The inductive type is too large and bulky, so it is generally said that high frequencies are used.