What is a strobe light? What does strobe mean?

Introduction: A strobe light is a kind of light that can be flashed at a certain time interval, and is generally used in parties, store decorations or some barbecue stalls. I believe everyone has seen the strobe lights, and many friends like to see the flashing strobe lights at night, so the strobe lights can flicker frequently, what is the reason?

1. Strobe light principle - Introduction.

Strobe lamp is a kind of flash according to the preset frequency or external trigger frequency to control the flash speed, mainly composed of external trigger automatic tracking module, flash control module, adjustment and function selection button, man-machine display interface and flash power supply module, etc., has been widely used in military industry, shipbuilding, product research and development, steel manufacturing, aerospace and other fields.

Second, the principle of strobe light - the difference.

We call the flash applied to the camera an electronic flash, because the electronic flash needs to have a capacitor charging time after each flash, so its flash frequency is low and cannot flash continuously; The strobe lamp does not need to charge the capacitor after flashing, and its flash frequency is usually set between 1 50000 seconds and 1 1000 seconds, which has a fairly high flash speed.

3. Strobe light principle - automatic mode.

The strobe light usually uses the automatic ** mode, and its working principle is as follows: at the flash moment of the strobe lamp, the photosensitive element in the flash device receives the light reflected back by the subject and measures it, when the measurement result shows that the light of the subject is enough to carry out normal **, the photosensitive element will push the actuator to turn off the strobe light, if the measurement result shows that the light of the subject is not enough to carry out the normal **, the photosensitive element will not perform the action to make the strobe light in the open state, And the stronger the light required by the subject, the higher the frequency of the strobe light flashing to achieve normal shooting needs.

Fourth, the principle of strobe light - speed measurement function.

When the flashing frequency of the strobe light is synchronized with the movement speed of the measured object, the picture taken when the strobe light flashes is exactly the same, and the two are relatively stationary, so the flash frequency of the strobe light flash speed is the movement frequency of the measured object. In real life, this principle is often used to complete the speed measurement of rotating bodies such as gears, rotating shafts, pulleys, motors, etc.

The meaning of strobe: Strobe is to look at the screen of another electrical appliance in the screen of one electrical appliance, and the screen of another electrical appliance will have a bright line that moves from the bottom of the screen to the top, and then appears from the bottom. This goes on endlessly, giving us the impression that the image is flickering.

In the absolute sense, no flicker is actually impossible, and the strobe requirement of the Chinese industry standard for qualified products is 3125Hz.

The CCTV evening party revealed that some LED lamps may have serious ones"Strobe"Long-term exposure to this environment can cause headaches and eye strain, cause photosensitive epilepsy, lead to vision loss and distraction. In the absolute sense, no flicker is actually impossible, and the strobe requirement of the Chinese industry standard for qualified products is 3125Hz.

LCD screen:The LCD screen is also flickering, after all, it is an image made by electricity, and the optimal refresh rate of each LCD monitor is different, and it can be adjusted to the most comfortable for the eyes. Although it is different from the CRT principle, it has a backlight plate in the middle, and too high a boost of the backlight board will cause flicker.

The explanation of strobe is to look at the screen of another appliance in the screen of one appliance, and the screen of another appliance will have a bright line that moves from the bottom of the screen to the top and then appears from the bottom. This goes on endlessly, giving us the impression that the image is flickering.

From a professional point of view, "strobe" refers to the fluctuation of the electric flux of an electric light source at a certain frequency, while the exact name of "no strobe" is "imperceptible strobe". The human eye can generally detect the flickering of light below 80Hz, and the human eye can perceive the change of light and darkness at this time. In the test broadcast by CCTV, pointing a mobile phone at the screen found that there was a streak distribution, which was caused by stroboscopy.

The damage of strobe is huge, and it must not be underestimated

Don't underestimate the harm caused by lighting stroboscopy, which is closely related to neurological diseases such as migraine, headache, autism, visual fatigue and discomfort, which can cause illusions to the human eye and then cause accidents.

Studies have shown that 3 70Hz low-frequency flickering light sources may cause photosensitive epilepsy; A 100 Hz flickering light source has been identified as causing headaches and migraines; For the flickering light source at 120hz frequency, it may affect people's mood, and there will be boredom, anxiety, etc. The optical illusion caused by the strobe effect and the associated mechanical movement is very dangerous in industrial places.

Most LEDs don't flicker now.

The phenomenon of whether there is flicker or not depends on the power supply.

There is no such thing as absolutely flicker-free, because the strobe comes from the power supply. Strictly speaking, only the DC power supply of a pure broken battery can be said to have absolutely no strobe, and the conversion power supply of the DC battery has harmonics.

None of them can be said to be absolutely flicker-free. To a corresponding extent, it can be understood in this way LED lights.

It's really flicker-free, and it's strobe better than incandescent lamps.

All good. <>

I've tried it with LED lights at home, most of them don't, but individual brands do. The method of testing is as simple as waving a finger against a dark background under the illumination of an LED light. The trajectory of the fingers is continuous, indicating that there is no strobosis. Intermittent, indicating that there is a strobe.

In this case, first check the power supply and circuit part to confirm that it is not caused by poor contact; Then test whether the circuit has current and voltage to see if there is an open circuit problem; Finally, if it is determined that it is not a problem with the circuit, then the problem should be in the part of the LED lamp, and it is necessary to check whether the LED lamp itself is faulty or damaged.

How to check when the LED light is flashing:

1. Test the current and voltage of the circuit with a pen, and reconnect the circuit if there is an open circuit.

2. After the circuit is restored, the strobe problem still appears, it should be that the power supply of the driver is insufficient, and the driver needs to be repaired or replaced.

Precautions during the use of LEDs:

1. The installation site is best ventilated, clean and free of corrosive gases.

2. LED bulbs can be used in combination with ballasts, and the power is preferably the same.

3. When dust appears in the lamp, dust should be removed with a dry cloth, and it should not be cleaned with water.

4. The metal part should not be contaminated with chemical agents, which will damage the LED light.

5. Moisture-proof and moisture-proof is the key to maintaining LED lights, and problems such as rust and leakage are easy to occur in humid places, so it is best to avoid using LED lights in such places.

6. If the LED lamp is used in a place with low temperature, the lamp should be ensured to have good sealing.

7. The suitable temperature of LED lights is between 5 degrees and 40 degrees, so avoid using them in a high-temperature environment.

1. Analysis of the causes of LED light strobe.

1. The LED lamp beads do not match the LED driving power supply.

Under normal circumstances, the current of a single 1W lamp bead is 280-300mA, and the voltage is if the lamp bead chip is not sufficient.

rate, it will cause the light source flicker phenomenon, the current is too high, the lamp bead can not bear, there will be a phenomenon of one on and one off, in serious cases, the built-in gold wire or copper wire of the lamp bead will be burned off, resulting in the lamp bead is not lit.

2. The drive power supply is damaged.

It may be that the drive power supply is broken, this situation is easy to deal with, as long as you replace it with another good drive power supply, the lamp will not flash.

3. Poor heat dissipation.

If the drive has an over-temperature protection function, and the material heat dissipation of the lamp cannot meet the requirements, when the over-temperature protection of the drive starts to work, too.

There will be a phenomenon of flickering and flickering; For example, the 20W flood light shell is used to assemble a 30W lamp, and the heat dissipation work is not done well.

4. Water ingress into the lamp.

If the outdoor lamps also have the phenomenon of flickering on and off, it means that the lamps are flooded, and the consequence is that they will not light up when they are flashing; Generally, yes.

The beads and the drive are broken, therefore, the drive of the outdoor lamps needs to be waterproofed, if the lamp beads are broken, just replace the light source.

Second, the solution of LED light strobe.

1. Increase the output electrolytic capacitor scheme.

If it is a voltage problem, directly increase the output electrolytic capacitance, which can make the lamp return to normal, and "increase the output electrolytic capacitance".

Theoretically, it is possible to use electrolytic capacitors to absorb part of the AC ripple, but in fact, when the ripple is controlled within a certain range, it is difficult to enter.

One step reduction, unless the electrolytic capacitance is added regardless of the cost, it cannot be fundamentally eliminated.

2. Adopt valley filling passive PFC scheme.

It is one of the most mainstream treatments, using two large capacitors and three diodes for power factor correction at the rectifier bridge.

There is a large electrolytic capacitor at the back, which absorbs the AC ripple, and the current through the inductor or transformer to the secondary part is DC.

Repairing LED lights is actually very simple, the old electrician teaches you to measure and repair by hand, practical electrician technology!

LED light flickering, on the one hand, is related to the power quality of the lamp, and on the other hand, it is related to the PWM dimming frequency of the lamp.

Take the general household LED bulb as an example to analyze:

First of all, understand the internal structure of the lamp: it is generally composed of driver board + LED light board, and some are DOB integrated;

The common drive board is the cheapestResistor-capacitance design drivenThe front is a large capacitor step-down, and the back is an electrolytic energy storage constant current output, and there is no constant current driven chip.

The reason for this corresponding flashing light is that the electrolysis of the constant current output of the energy storage is broken, resulting in the LED input being AC, so the flashing light phenomenon occurs.

There could be the following reasons:

1. The power transformer is not good, the parameters do not meet, and the winding is not enough or more, resulting in magnetic saturation or insufficient inductance.

2. The feedback circuit is faulty.

The strobe and strobe effect are directly related to the type of electric light source and its technical performance. Different types of electric light sources with different technical properties have different degrees of strobe and strobe effects.

LED LCD screen flashing:

LED LCD display, with backlight strobe in low brightness mode, similar to an old-fashioned CRT display, quickly shake your finger in front of the screen, visible ghosting.

This kind of flicker can cause eye strain, and although it does not flicker in the brightest mode, it can also be harmful to the eyes because it is too dazzling.

The reason for the strobe is that the LED backlight uses PWM (pulse width modulated wave) technology, which reduces the brightness by reducing the LED energizing frequency, and when it is low to a certain limit, the above-mentioned visible strobe appears, and it can be seen that the LED LCD screen is absolutely not flickering as advertised by the original LCD technology.

The above content refers to Encyclopedia-LED strobe.

What is the cause of the flickering LED light.

Hello, I am helping you to inquire about the relevant information and will reply to you immediately. It may be that the power supply between the lamp bead and the driver is not equal, and in this case, there will also be a phenomenon of old flashing. 2.

It is possible that the voltage and current of the LED light are faulty, and in this case, it may cause the LED light to flash constantly. 3.It is also possible that the driver power supply is broken, and we need to replace it with a new one, so that the LED light will not have the problem of flickering.

4.If the LED light keeps flashing, it may be that the driver has over-temperature protection, in this case, it is very likely that the heat dissipation performance of the lamp does not meet certain requirements, and the over-temperature protection of the driver is turned on in this case, the LED will also keep flashing. We can do a good job of LED lights, and this will not be the case for heat dissipation.