LED driving power is a converter that converts input voltage and current into specific values required for LEDs. Generally, the input of the LED power source includes commercial power, low voltage DC, high voltage DC, low voltage high-frequency AC, etc. The core components of the LED power supply include a switch controller, an inductor, a switching component, feedback resistor, input filter component, the output filter component, and so on. According to the different requirements, there are also have a variety of protection circuit.
Sometimes, what decides the lifespan of LED lights is not themselves, but the drive power. A good power supply requires high reliability, high efficiency, and protection functions. High reliability ensures smooth operation of power supplies and LED lights, reducing post-maintenance costs. The high efficiency will reduce consumption, which reduces the temperature rise of the LED. Moreover, according to the service environment, the power supply also needs to add the corresponding protection function to prevent the lamp from being damaged by the electrical surge, reverse voltage and so on.
According to the driving mode, the power supply can be divided into the constant current supply and the stabilized voltage supply. The current output by the constant current driving circuit is constant, and the output DC voltage varies within a certain range depending on the magnitude of the load resistance. When the parameters in the voltage stabilizing circuit are determined, the output voltage is fixed, and the output current changes as the load increases or decreases. The constant current supply is more suitable for LED lights than the stabilized supply, but the cost of is also higher.
2018年10月24日星期三
2018年10月5日星期五
The main materials of LEDs
The LED is mainly composed of six materials: base, silver glue, chip, bond wire, epoxy resin, and phosphor.
1. LED base:
The base, also known as the LED support and LED bracket, inside the LED is used for conducting and supporting, which is generally formed by electroplating of the metal material. There are two types of LED base, that is, cup-shaped brackets and flat brackets, which are applied for concentrated-light LEDs and wide-angle LEDs respectively.
2. Sliver glue:
The role of silver glue is to immobilize the chip and conduct electricity. The proportion of the main components is 75-80% for silver powder, 10-15% for EPOXY and 5-10% for additives.
3. Chip:
The chip is a luminescent semiconductor material, generally produced by using GaP, GaAlAs, GaAs, GaN, etc., and its internal structure has unidirectional conductivity. Due to the chip can not emit white light directly, the white light LED is a mixture of a blue-light chip and a yellow phosphor.
4. Bond wire:
The bond wire is a metal wire used to connect the wafer PAD and the holder. In production, gold wires with a purity of 99.99% are generally used, its specifications are 0.9 mils, 1.0 mils, and 1.1 mils etc.
5. Epoxy resin:
The role of the epoxy resin is to protect the internal structure of the LED and slightly change the color, brightness, and beam angle.
6. Phosphor:
At present, most of the white LED light strips, LED bulbs, LED spotlights, etc. are phosphor conversion LEDs, that is, the blue light emitted by the chip is converted into white light by the corresponding phosphor. The phosphor conversion LED has a simple circuit, low production cost, and good heat dissipation, and is dominant in the current LED product market.
The original site:
http://www.mldrled.com/news/
1. LED base:
The base, also known as the LED support and LED bracket, inside the LED is used for conducting and supporting, which is generally formed by electroplating of the metal material. There are two types of LED base, that is, cup-shaped brackets and flat brackets, which are applied for concentrated-light LEDs and wide-angle LEDs respectively.
2. Sliver glue:
The role of silver glue is to immobilize the chip and conduct electricity. The proportion of the main components is 75-80% for silver powder, 10-15% for EPOXY and 5-10% for additives.
3. Chip:
The chip is a luminescent semiconductor material, generally produced by using GaP, GaAlAs, GaAs, GaN, etc., and its internal structure has unidirectional conductivity. Due to the chip can not emit white light directly, the white light LED is a mixture of a blue-light chip and a yellow phosphor.
4. Bond wire:
The bond wire is a metal wire used to connect the wafer PAD and the holder. In production, gold wires with a purity of 99.99% are generally used, its specifications are 0.9 mils, 1.0 mils, and 1.1 mils etc.
5. Epoxy resin:
The role of the epoxy resin is to protect the internal structure of the LED and slightly change the color, brightness, and beam angle.
6. Phosphor:
At present, most of the white LED light strips, LED bulbs, LED spotlights, etc. are phosphor conversion LEDs, that is, the blue light emitted by the chip is converted into white light by the corresponding phosphor. The phosphor conversion LED has a simple circuit, low production cost, and good heat dissipation, and is dominant in the current LED product market.
The original site:
http://www.mldrled.com/news/
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