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What is the cause of the LED flashing?

What is the cause of the LED flashing?

Jul 20, 2019

The LED light flashes, which belongs to the latter case: during the charging process of the capacitor, the lamp is extinguished - because the internal current of the capacitor is small, the charging speed is very slow, so the naked eye can be seen with the naked eye. When the capacitor is fully charged, the power is released once and the light is turned on. However, due to the less stored electrical energy, the electric light will soon be extinguished - repeated charging and discharging, and the naked eye sees the light flashing.


When the lamp is in normal use, no flicker is seen because the current through the capacitor is large and the charging speed is extremely fast.

So, what would cause a small current to flow inside the capacitor? The first reason is that the quality of the capacitor is not good - a good capacitor, a lot of stored power, and a small current in the line is not enough to store energy in the capacitor. The average starter is only about 20 yuan, and the cost of high-quality capacitors is probably more than 20 yuan.


In addition, we can start with a source of tiny currents.

LED lamps require less current and are sensitive to voltage and current. In use, they cause inductive illumination due to various complex reasons. Then, what is the reason why LED lights emit weak light when the switch is turned off? What is the solution for LED panel light manufacturers?


1, the zero line is charged

This is the most common situation, 1 because the plumber enters the lamp base directly when the plumber is in the line, and the zero line enters the control switch. This causes the switch to be disconnected, and the live line still has a current passing through the light to reach the switch, which causes the light to be slightly bright. Solution: In this case, adjust the wiring and let the switch control the live line.


The switch controls the neutral line, causing current to flow through the lamp

2 Because the water and electrician connected the wrong line when the main gate entered the line, the fire zero line was reversed. This accidentally reversed all the fire and zero lines, causing all the switches to control the zero line. The solution to this situation: just need to reverse the incoming line.

3 If the switch controls the live line, the traditional mechanical wall switch is used, or the light is on, that is, the neutral line is charged. Zero line charging is a common phenomenon. If the neutral line is not well grounded, the three-phase load of the transformer is unbalanced, the line is too long, the wire diameter is thin, or the zero line current is too large, which will cause the neutral line to be charged.

Solution: Re-zero grounding or low-voltage retrofitting (this requires the property to be easily solved by the power supply company).


2, the double control switch has a wiring error

Error connection, although it can also be used

There are several ways to connect the two-control switch. If the wrong connection is used, the traditional incandescent lamp will not be bright, but for the LED light, because it is actually DC, it will be slightly bright after turning off the light. Solution to this situation: install the normal control FireWire connection and rewire.

Correct connection, any switch can cut off the power

Wiring method of dual control switch: single double control switch, there are three contacts at the back, which are L, L1, L2. The two L1 and L2 are respectively linked first, the fire wire is connected to the L contact point of a dual control switch, and the control circuit line is connected to the L contact of the other dual control switch.


3, switch with indicator light, using electronic, touch switch

There is an indicator light inside the switch, and a slight current will flow after the light is turned off.

If the luminaire uses an electronic touch switch, such as infrared, voice control, remote control switch. There will also be a shimmering phenomenon after turning off the light. The solution to this situation: 1 change the switch. 2 Parallel 500K resistors in the incoming line of the lamp. But this method professional technicians measure the installation, non-professionals are best not to operate casually. And this method is ineffective for the zero line to be charged, or the dimming caused by the leakage of the patch.