There is a capacitor in the LED lamp driver, which can be understood as a small capacity rechargeable battery: when the current passes through the capacitor, the capacitor will continue to charge-after fully charged, the capacitor will release all the stored electrical energy at one time .
The LED light flickers, which belongs to the latter case: the light is extinguished during the capacitor charging process-because the internal current of the capacitor is small, the charging speed is very slow, so you can see that the light is extinguished with the naked eye. When the capacitor is fully charged, it releases electrical energy at one time and lights up the lamp. But because of the small amount of stored electric energy, the light will go out very quickly-repeatedly charging and discharging, the naked eye can see the light flickering.
When the lamp is in normal use, no flicker can be seen, because the current through the capacitor is large and the charging speed is extremely fast.
So, what will cause a small current to flow inside the capacitor? The first is because the quality of the capacitor is not good-a high-quality capacitor has a lot of stored power, and the tiny current in the circuit 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 also start from the source of tiny currents.
Possibility 1. Switch to control the neutral line
The switch controls the neutral wire, which means that the live wire is directly connected to the light (capacitor). The live wire has a high potential. If there is a low potential in the line at this time, a potential difference will be formed-another name for the potential difference, called voltage. It's just that the potential difference at this time is much smaller than that of 220V. When voltage is applied across the capacitor, a weak current will be generated.
Therefore, the direct connection of the live wire to the electric light will inevitably cause the LED light to flicker. This is a construction problem, and there is no other way except to change the direction of the zero line of fire.
Possibility 2. Neutral line is live
If both ends of the lamp (capacitor) are connected to the zero line of zero potential, will everything be fine? Not at all!
The neutral wire is easy to be charged-especially the neutral wire of an electric light. Mainly because the light switch is too unreliable.
The quality of the internal structure of the current light switch is very worrying. If the distance between the neutral wire terminal is too close, the insulation is not qualified, etc., it may cause the neutral wire of the electric lamp to be charged.
If you don’t believe me, you can open the switch that you have connected to your home and test it with an electric pen. In theory, when the switch is off, only the Firewire terminal can light up the electric pen. But in actual use, the terminal connected to the zero line (lamp line) can also light up the electric pen in all likelihood. It's just that most switches, even if the neutral line is charged, have a relatively low voltage, which is not enough to generate current in the line. But if the insulation is a little bit worse, the current generated is slightly larger, and the capacitor will be charged.
Another point: when the switch has an indicator light, the indicator light will light up when the light is turned off. At this time, a weak current needs to be generated-this part of the current will flow through the capacitor and be stored by the capacitor.
These situations can be solved by replacing a better quality switch without indicator light.
Possibility 3. Inductive electricity If there are many wires around the capacitor, when other wires are working, it will cause induced electricity near the capacitor-one sentence to explain the reason for the induced electricity: two conductors are placed in parallel to form a new capacitor .
Most people are at a loss when facing this situation. There are two solutions at this time: 1. Replace the electric lamp with a fluorescent lamp or an incandescent lamp.
2. Connect a 220V relay coil in series with the starter of the LED light. Use the coil to consume the induced electricity generated by the circuit.
Why do some LED lights still light up after being turned off? How to deal with it?
LED lamps are now widely used. Because of their low energy consumption, high brightness, and environmental protection, they have replaced incandescent lamps and tubes. Why do some LED lights still light up after being turned off? Today we analyze the reasons.
1. The switch is connected to the N zero line. When the switch is disconnected, the lamp is still connected to the live wire and will emit a faint light.
The correct wiring solution for a single control switch: adjust the circuit so that the switch controls the live wire.
Second, there are many ways to connect the dual-controller wiring, some of which are unreasonable, which may also cause the lamps to light up after the power is turned off.
Although the above picture can also control the LED lights normally, it is unreasonable. Solution: Adjust the wiring and change it to the correct wiring in Figure 1.
Third, the quality of the LED lamp itself is not good enough, and common problems such as leakage of the substrate. Solution: There is nothing to say about this, you can only change the lamps and buy lamps with guaranteed quality.
Fourth, the neutral line is live, and there are not many cases where the neutral line of the household line is live. If it is single-phase electricity separated from three-phase electricity, occasionally there will be a live zero line, such as unbalanced three-phase voltage, excessively long lines, excessive current, etc., which will cause the zero line to become live.
Solution: Install an LED anti-shimmer protector, even if there are any of the above reasons, it can solve the phenomenon of dim light after the power is turned off.
Fifth, do not use electronic switches. There are indicators inside the electronic switches. There are indicators when they are turned on and off. Therefore, there is still a weak current in the switch after the light is turned off, which will also cause the LED light to light up.
Electronic switch solution: just change to an ordinary switch.
The simple ones are the best here.
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