What causes the LED lights to flicker?
When the LED light flashes, it belongs to the latter case: in the process of charging the capacitor, the light is off - due to the small current inside the capacitor, the charging speed is very slow, so you can see the light goes out with the naked eye. When the capacitor is fully charged, it releases electricity at one time and lights up the lamp. But because there is less energy stored, the light will go out very quickly—recharging and discharging repeatedly, and the naked eye sees the light flickering.
When the lamp is in normal use, no flickering can be seen because the current passing through the capacitor is large and the charging speed is extremely fast.
So, what causes a small current to flow inside the capacitor? First of all, it is because the quality of the capacitor is not good - a high-quality capacitor can store a lot of electricity, and the tiny 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 also start with the source of tiny current.
LED lights require small current and are quite sensitive to voltage and current. In use, they will cause induction light due to various complex reasons. So what is the reason why the LED light still emits a weak light when the switch is turned off, and what solution does the LED panel light manufacturer have?
1. The neutral line is charged
This is the most common situation. ①Because when the plumber was arranging the wires, the live wire went directly into the lamp base, and the neutral wire went into the control switch. This results in that although the switch is disconnected, the live wire still has current flowing through the light to reach the switch, resulting in the light still slightly bright. Solution: In this case, adjust the wiring so that the switch controls the live wire.
The switch controls the neutral line, causing current to flow through the lamp
②Because the plumber connected the wrong line when the main gate entered the line, and the live neutral line was reversed, this unexpectedly reversed all the live neutral lines, causing all switches to control the neutral line. The solution to this situation: just switch the incoming line.
③If the switch controls the live wire, the traditional mechanical wall switch is used, or the light is still on, that is, the neutral wire is charged. Neutral charging is a very 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 line diameter is thin, or the neutral line current is too large, the neutral line will be charged.
Solution: re-ground the zero line or carry out low-voltage transformation (this requires the property to pass the power supply company to facilitate the solution).
2. The double-control switch has a wiring error
Wrong connection, although it can also be used
There are several wiring methods for the dual-control switch. If the wrong connection is used, the traditional incandescent lamp will not light up, but for the LED lamp, because of the direct current, it will light up slightly after the light is turned off. Solution for this situation: Install the normal control live wire connection and rewire.
Correct connection, any switch can cut off the power
Wiring method of double-control switch: single-connection double-control switch, there are three contacts at the back, namely L, L1, L2. Connect the two L1 and L2 respectively, the live wire is connected to the L contact point of one dual-control switch, and the control loop line is connected to the L contact of the other dual-control switch.
3. The switch has an indicator light, using electronic and touch switches
There is an indicator light inside the switch, and a slight current will flow after the light is turned off.
If the lamps use electronic touch switches, such as infrared, voice control, and remote control switches. There is also a shimmering phenomenon when the lights are turned off. Solution to this situation: ① Change the switch. ②Connect a 500K resistor in parallel at the incoming line of the lamp. However, this method is measured by professional technicians, and non-professionals are best not to operate it casually. And this method is invalid for the zero line charging, or the shimmer caused by the leakage of the patch.
4. Non-isolated driver, light source patch and substrate leakage
Many lamps are driven by inferior resistance-capacitor step-down due to cost considerations, or the quality of the light source patch is poor, and there is leakage of the patch and the substrate. Substrate copper cladding and substrate capacitance effects can also cause light leakage. This is why in a room, the lights are on and off.
