The reason why the light bulb is still bright after the LED light is turned off is analyzed and solved

The light-emitting diode light bulb is fundamentally different from the traditional incandescent light both in terms of structure and light-emitting principle. Diodes are commonly used components in electronic circuits. They are made of semiconductor PN junctions, plus electrode leads and shells. Diode has PN junction two electrodes, so called diode. The diode has unidirectional conductivity. There are many types of diodes, such as detector tubes, rectifier tubes, voltage regulator tubes, switch tubes, damper diodes, light emitting diodes, and photocells.

Led bulb light-emitting diodes are usually made of semiconductor materials such as gallium arsenide, gallium phosphide, etc. It emits light when passing a forward current. The color of the light depends on the materials used and can emit red, yellow, green, and infrared light. Light-emitting diodes are generally packaged in transparent plastic, with a positive electrode for the long pin and a negative electrode for the short pin. Some light-emitting diodes have three pins that emit two colors of light depending on the voltage of the pins.

The led lamp is more energy-saving. The difference between LED lamps and ordinary lamps (incandescent halogen lamps and energy-saving lamps) is mainly from the light-emitting principle. Incandescent lamps, halogen lamps, and other general lighting bulbs are all converted into heat energy into light energy. Most of this energy is wasted in this kind of plant. LED lamps convert electricity directly into light energy. This process saves most of the energy. This is the fundamental reason why LED lamps are more energy-efficient.

LED lights emit less heat. LED is a more advanced cold light source, it does not radiate a lot of infrared rays and ultraviolet rays like incandescent lamps and fluorescent lamps. It is especially suitable for the illumination of valuables such as cultural relics, jewelry, and high-grade cosmetics. There is almost no current heating effect like an incandescent lamp, and it will not be blown by the effect of thermal expansion and contraction. Do not make the bulb yellow, it will not accelerate the aging of the lamp, and it will not cause a greenhouse effect on the surrounding environment.

The advantage of led lights is that there is no danger of metallic mercury. LED lamps do not use highly hazardous mercury as in fluorescent lamps. The particle layout of LED lamps and display screens generally generates light that is scattered and rarely produces light pollution. The epoxy resin used to manufacture LEDs is an organic polymer compound that cures. Good physical and chemical properties, high bonding strength to wafers, metals, hard and flexible, stable to salt alkali and most solvents, not easy to damage, even if damaged or aging can be recycled and reused, will not form on the environment Pollution.

The advantage of the led lamp is that the led lamp adopts a low-voltage power supply and uses a low-voltage power supply. In terms of physics, it is safer than the high-voltage power supply. During use, the voltage of a single light bulb is between 2V and 4V. The voltage is low, so it can be used more safely for everyone, without worrying about the power supply of the lamp will cause harm.

Led lighting efficiency. The highest light efficiency of CREE's laboratory has reached 260lm/W, while the single high-power LED on the market has also exceeded 100lm/W. The LED energy-saving lamp made is due to the loss of power efficiency, the optical loss of the lampshade, and the actual luminous efficiency. At 60 lm/W, while the incandescent lamp is only about 15 lm/W, the good quality energy-saving lamp is about 60 lm/W, so overall, the LED energy-saving lighting effect is equal to or slightly better than the energy-saving lamp.

Speaking of the advantages of led lights, have to mention the shortcomings of led lights, which is the main factor restricting the development of led lights, the first is the weight, the weight of fluorescent lamps is only a few of the LED lamps, because there is no problem with the heat sink, fluorescent lamps The weight of the lamp holder is negligible, but the weight of the LED is a very serious test for the lamp holder. The second is the price, 1W1 fluorescent lamp is much more cost-effective than 1W10 LED. In particular, damage to the LED luminaire is often not a bad wick, but it requires replacement of the entire lamp. If one-tenth of the driver boards have to discard the remaining nine-tenths of the lights, customers will not like such products.

As we all know, when the two ends of the lamp are connected to one wire and two wires, the light will be normally on. When both ends of the lamp are connected to the FireWire at the same time, the lamp will never light, nor will it be bright or flashing. If the lamp is connected to both ends of the lamp at the same time, the following conditions will occur. Good quality lamps will not light, and poor quality lamps and some so-called super bright lamps will appear bright or flickering.

The LED is operated in a pure DC or pulsed DC condition. The rectifier circuit of the circuit board first converts the 220V AC to a pulsed DC power of 220*2=310V, and then the pulsed DC power of the pump power supply assembly is reduced to dozens of suitable LED operations. Volt. To prevent the electronic components on the circuit board from being affected by this? 2 The peak voltage breakdown, generally in the input AC circuit in series with a high-resistance resistor to limit the pressure, with the resistance of the volume to limit the flow. When the resistance of this resistor is small, the induced voltage on the zero line after the double control switch is closed will trigger the power supply of the pump to make the LED work. Since the zero-line induction current is not strong, the LED is in a bright state. The digital induction test pencil is the same.

In home-built pre-embedded lines, if it is the main gate, multiple sets of combinations of a single lamp are used to control a set of lamps. The induced currents on many zero lines will make the LED light in this environment. If there is only one open, because there is not so much zero line support, so the LED will shine like a car turning lights.

Understand the reason for this improved method, find vendors to swap LED lights. If the lamp is online, switching is not realistic, you can only increase the largest resistor on the circuit board. Use the resistance meter of the three-meter meter to test it first. The added resistance is 1.1 to 1.3 of the measured resistance. Times can be, the original size of the resistor is the same or can be changed. After the resistance is increased, the brightness of the LED lamp will decrease slightly, but the human eye cannot feel it.

Another improvement method is to use a non-polarity capacitor in parallel with the LED. The withstand voltage of the capacitor must be above 660v. Otherwise, the lightning strikes the outdoor cable due to thunderstorms, causing the capacitor to break down and causing the open-air tripping.

LED light source excitation current is small, very sensitive to voltage and current, in use will cause a variety of complex causes of inductive luminescence, even after turning off the light will emit a light, affecting normal sleep, accelerated light decay.

Generally caused by the following reasons:

1. The switch controls the neutral line.

This is one of the more common reasons. When the electrician is wiring, the switch controls the neutral line, or the electric box is connected to the line and the flame is reversed. The zero line is controlled by the switch, and the fire line is still connected to the lamp and it will give off light.

Solution: Adjust the wiring, let the switch control the fire line.

2, double control switch error connection

There are several types of wiring for the dual-control switch. If the wrong connection is used, it will be turned off and lightly illuminated.

Solution: Install the normal Control FireWire connection and reconnect.

3, switch with light, with electronic switches

There is a light inside the switch, and there will be a slight current flow after turning off the light.

If the lamp is using an electronic switch, such as infrared, voice control, remote control switch. It will also appear after the lights off after the phenomenon of low light.

Solution 1: Change the switch.

Solution 2: Connect the 500K resistor in parallel with the incoming line of the lamp. However, this method has high technical requirements and non-professionals are not easy to operate. Also, it is not effective for the zero line to be charged, or for the glare caused by patch leakage.

4, non-isolated drive, light source patch and substrate leakage

Many lighting fixtures are driven by low-quality resistive-capacity bucks 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 and substrate capacitance effects can also cause light leakage. This is why the light in the room has a bright light.

Solution: Change lamps, fight luck.

5, the zero line charged, in fact, the zero line charged is the most fundamental reason for turning off the light.

If the switch controls the FireWire, the ordinary wall switch is used, or the light is emitted, and the neutral wire is charged.

Zero line charging is a very common phenomenon. If the neutral line is not grounded properly, the three-phase load of the transformer is unbalanced, the line is too long, the wire diameter is thin, or the neutral wire current is too large, which can cause zero-line electrification.

Solution: Re-zero line or low voltage modification.

6, the final recommendation of a simple and effective solution is to use LED light protectors, can completely solve the various reasons for shimmering.

Connect the protector to the lamp. After the lamp is turned off, the connection between the lamp and the mains will be disconnected.

Even if the neutral wire is charged, the patch leaks, and the switch is connected incorrectly, no current will be conducted to the lamp.

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