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Introduction to LED
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Introduction to LED

(Summary description) Classification of Led Lights: Fluorescent light, panel light, down light, ceiling light, spot light, track light, etc Take a look at the directory of the index above, the lights are all on it, so be familiar with them.) Classification of common lamp beads: 1. In-line low-power specifications include: straw hat/helmet, round head, concave, oval, tombstone type (2*3*4) bullet head, flat head, (3/5/flat head/bread type) piranha, etc. 2. SMD patches are generally divided into (3020/3528/5050, which are front-emitting)/1016/1024, etc. These are side-emitting light sources. The name is named according to the specifications of the patch. For example, 3020 is 30mm*20mm. . 3. High-power LEDs cannot be classified into SMD series, their power and current usage are different, and the optoelectronic parameters are very different. If a single high-power LED light source does not have a heat dissipation base (usually a hexagonal aluminum base), its appearance is not much different from that of ordinary patches. However, it is essentially different from SMD patches in terms of use conditions/environments/effects. The voltage of a single lamp bead: the voltage of the general lamp bead is 2.8-3.6vf, and the middle value is 3.3vf when calculating in series and parallel. Power classification: According to the different output characteristics, it is divided into: constant voltage series (CV), constant current series (CC) (constant voltage refers to constant voltage output, constant current output, and one of them is the complementary power supply of constant voltage + constant current) According to the different input characteristics, it is divided into: ordinary series, high power factor series (high power factor mainly refers to power factor, and a detailed introduction to this parameter will be given later) According to different uses, it is divided into: waterproof series, non-waterproof series (this does not need to be explained, everyone understands) According to different circuit structures, it is divided into: isolation series, non-isolation series (the difference between isolation and non-isolation here is mainly whether there is a transformer, because we know that the household voltage is 220v sinusoidal alternating current, and the isolated power supply design idea is to step down first through the transformer Re-rectification, this design can distinguish high voltage and low voltage, which is more advantageous than the power supply without transformer. For example, the output of our LED power supply is DC safe voltage, which can be directly touched by people (except for high-power power supplies), even if the low-voltage part is broken, It will not leak electricity, but the use of non-isolated ones is likely to cause electric shock) According to different control methods, it is divided into: dimmable series, non-dimming series (the parameters of dimming will be introduced in detail later) Series and Parallel: First, confirm the sum of the forward voltage of each string of LEDs, plus the voltage drop of the constant current driver is about 2V LED operating voltage per string = 3.5V X 12 pieces = 42V Drive circuit voltage = 42V + 2V = 44V LED current = 0.7A X 4 series parallel = 2.8A Driver circuit wattage = 44V X 2.8A = 123.2W LED power supply wattage/voltage selection should be greater than and closest to the desired wattage/voltage First select the LED power supply based on the 150W/48V demand, and then confirm whether the actual wattage of the drive circuit meets the load requirement of PF>0.9 (123.2W /150W = 82.13%>75%) For example, in this question, you can choose the CLG-150A-48 model and adjust the output voltage to 44V or apply it directly without adjusting the output voltage. Note: Generally, the Vf voltage of the same batch of LEDs may be in a range (such as 3.4~3.6V), and each LED is different, so the influence of this difference should be considered in the selection of the power supply PWM dimming: The dimming methods of MW dimming power supply mainly include control signal (resistance/voltage/PWM) dimming current dimming and thyristor AC (phase shifting) voltage dimming. 1. Products that control signal dimming include ELN, LPF-XD, HLN-XB, HLP, HLG-XB, HVG(S)-XB, etc. Its adjustment range is 5/15% ~ 100/103% of rated current. There are three options for the control signal as follows a). Potentiometer (100kΩ/1~2kΩ variable resistance, adjust the current value through the LED by changing the resistance value of the potentiometer b).1~10V DC voltage, adjust the current value through the LED by changing the control voltage c). PWM signal (pulse amplitude 10V, f: 100~3000Hz, duty ratio: 0~100%). By changing the duty cycle to adjust the average current value through the LED, this control method can keep the color temperature of the LED unchanged Some specifications also have timing control function (such as HLG/HVG-D). The dimming power supply with control signal dimming has good

Introduction to LED

(Summary description)

Classification of Led Lights:
Fluorescent light, panel light, down light, ceiling light, spot light, track light, etc Take a look at the directory of the index above, the lights are all on it, so be familiar with them.)

Classification of common lamp beads:

1. In-line low-power specifications include: straw hat/helmet, round head, concave, oval, tombstone type (2*3*4) bullet head, flat head, (3/5/flat head/bread type) piranha, etc.

2. SMD patches are generally divided into (3020/3528/5050, which are front-emitting)/1016/1024, etc. These are side-emitting light sources. The name is named according to the specifications of the patch. For example, 3020 is 30mm*20mm. .

3. High-power LEDs cannot be classified into SMD series, their power and current usage are different, and the optoelectronic parameters are very different. If a single high-power LED light source does not have a heat dissipation base (usually a hexagonal aluminum base), its appearance is not much different from that of ordinary patches. However, it is essentially different from SMD patches in terms of use conditions/environments/effects.

The voltage of a single lamp bead: the voltage of the general lamp bead is 2.8-3.6vf, and the middle value is 3.3vf when calculating in series and parallel.

Power classification:
According to the different output characteristics, it is divided into: constant voltage series (CV), constant current series (CC) (constant voltage refers to constant voltage output, constant current output, and one of them is the complementary power supply of constant voltage + constant current)

According to the different input characteristics, it is divided into: ordinary series, high power factor series (high power factor mainly refers to power factor, and a detailed introduction to this parameter will be given later)

According to different uses, it is divided into: waterproof series, non-waterproof series (this does not need to be explained, everyone understands)

According to different circuit structures, it is divided into: isolation series, non-isolation series (the difference between isolation and non-isolation here is mainly whether there is a transformer, because we know that the household voltage is 220v sinusoidal alternating current, and the isolated power supply design idea is to step down first through the transformer Re-rectification, this design can distinguish high voltage and low voltage, which is more advantageous than the power supply without transformer. For example, the output of our LED power supply is DC safe voltage, which can be directly touched by people (except for high-power power supplies), even if the low-voltage part is broken, It will not leak electricity, but the use of non-isolated ones is likely to cause electric shock)

According to different control methods, it is divided into: dimmable series, non-dimming series (the parameters of dimming will be introduced in detail later)

Series and Parallel:


First, confirm the sum of the forward voltage of each string of LEDs, plus the voltage drop of the constant current driver is about 2V

LED operating voltage per string = 3.5V X 12 pieces = 42V

Drive circuit voltage = 42V + 2V = 44V

LED current = 0.7A X 4 series parallel = 2.8A

Driver circuit wattage = 44V X 2.8A = 123.2W

LED power supply wattage/voltage selection should be greater than and closest to the desired wattage/voltage

First select the LED power supply based on the 150W/48V demand, and then confirm whether the actual wattage of the drive circuit meets the load requirement of PF>0.9 (123.2W /150W = 82.13%>75%)

For example, in this question, you can choose the CLG-150A-48 model and adjust the output voltage to 44V or apply it directly without adjusting the output voltage.

Note: Generally, the Vf voltage of the same batch of LEDs may be in a range (such as 3.4~3.6V), and each LED is different, so the influence of this difference should be considered in the selection of the power supply

PWM dimming:


The dimming methods of MW dimming power supply mainly include control signal (resistance/voltage/PWM) dimming current dimming and thyristor AC (phase shifting) voltage dimming.

1. Products that control signal dimming include ELN, LPF-XD, HLN-XB, HLP, HLG-XB, HVG(S)-XB, etc. Its adjustment range is 5/15% ~ 100/103% of rated current. There are three options for the control signal as follows

a). Potentiometer (100kΩ/1~2kΩ variable resistance, adjust the current value through the LED by changing the resistance value of the potentiometer

b).1~10V DC voltage, adjust the current value through the LED by changing the control voltage

c). PWM signal (pulse amplitude 10V, f: 100~3000Hz, duty ratio: 0~100%). By changing the duty cycle to adjust the average current value through the LED, this control method can keep the color temperature of the LED unchanged

Some specifications also have timing control function (such as HLG/HVG-D).

The dimming power supply with control signal dimming has good

Information

Classification of Led Lights:
Fluorescent light, panel light, down light, ceiling light, spot light, track light, etc Take a look at the directory of the index above, the lights are all on it, so be familiar with them.)

Classification of common lamp beads:

1. In-line low-power specifications include: straw hat/helmet, round head, concave, oval, tombstone type (2*3*4) bullet head, flat head, (3/5/flat head/bread type) piranha, etc.

2. SMD patches are generally divided into (3020/3528/5050, which are front-emitting)/1016/1024, etc. These are side-emitting light sources. The name is named according to the specifications of the patch. For example, 3020 is 30mm*20mm. .

3. High-power LEDs cannot be classified into SMD series, their power and current usage are different, and the optoelectronic parameters are very different. If a single high-power LED light source does not have a heat dissipation base (usually a hexagonal aluminum base), its appearance is not much different from that of ordinary patches. However, it is essentially different from SMD patches in terms of use conditions/environments/effects.

The voltage of a single lamp bead: the voltage of the general lamp bead is 2.8-3.6vf, and the middle value is 3.3vf when calculating in series and parallel.

Power classification:
According to the different output characteristics, it is divided into: constant voltage series (CV), constant current series (CC) (constant voltage refers to constant voltage output, constant current output, and one of them is the complementary power supply of constant voltage + constant current)

According to the different input characteristics, it is divided into: ordinary series, high power factor series (high power factor mainly refers to power factor, and a detailed introduction to this parameter will be given later)

According to different uses, it is divided into: waterproof series, non-waterproof series (this does not need to be explained, everyone understands)

According to different circuit structures, it is divided into: isolation series, non-isolation series (the difference between isolation and non-isolation here is mainly whether there is a transformer, because we know that the household voltage is 220v sinusoidal alternating current, and the isolated power supply design idea is to step down first through the transformer Re-rectification, this design can distinguish high voltage and low voltage, which is more advantageous than the power supply without transformer. For example, the output of our LED power supply is DC safe voltage, which can be directly touched by people (except for high-power power supplies), even if the low-voltage part is broken, It will not leak electricity, but the use of non-isolated ones is likely to cause electric shock)

According to different control methods, it is divided into: dimmable series, non-dimming series (the parameters of dimming will be introduced in detail later)

Series and Parallel:


First, confirm the sum of the forward voltage of each string of LEDs, plus the voltage drop of the constant current driver is about 2V

LED operating voltage per string = 3.5V X 12 pieces = 42V

Drive circuit voltage = 42V + 2V = 44V

LED current = 0.7A X 4 series parallel = 2.8A

Driver circuit wattage = 44V X 2.8A = 123.2W

LED power supply wattage/voltage selection should be greater than and closest to the desired wattage/voltage

First select the LED power supply based on the 150W/48V demand, and then confirm whether the actual wattage of the drive circuit meets the load requirement of PF>0.9 (123.2W /150W = 82.13%>75%)

For example, in this question, you can choose the CLG-150A-48 model and adjust the output voltage to 44V or apply it directly without adjusting the output voltage.

Note: Generally, the Vf voltage of the same batch of LEDs may be in a range (such as 3.4~3.6V), and each LED is different, so the influence of this difference should be considered in the selection of the power supply

PWM dimming:


The dimming methods of MW dimming power supply mainly include control signal (resistance/voltage/PWM) dimming current dimming and thyristor AC (phase shifting) voltage dimming.

1. Products that control signal dimming include ELN, LPF-XD, HLN-XB, HLP, HLG-XB, HVG(S)-XB, etc. Its adjustment range is 5/15% ~ 100/103% of rated current. There are three options for the control signal as follows

a). Potentiometer (100kΩ/1~2kΩ variable resistance, adjust the current value through the LED by changing the resistance value of the potentiometer

b).1~10V DC voltage, adjust the current value through the LED by changing the control voltage

c). PWM signal (pulse amplitude 10V, f: 100~3000Hz, duty ratio: 0~100%). By changing the duty cycle to adjust the average current value through the LED, this control method can keep the color temperature of the LED unchanged

Some specifications also have timing control function (such as HLG/HVG-D).

The dimming power supply with control signal dimming has good electromagnetic compatibility (EMS), and the dimming range is wide and smooth.

2. The thyristor AC (phase shift) voltage regulation and dimming products include PCD series. (The matching thyristor dimmer has a specified model, and other types of dimmers cannot guarantee the dimming effect). The thyristor voltage regulating dimming power supply has poor performance, and is generally used in the transformation of old systems and low-cost applications.

Power input voltage:
For example: 88-264V/AC, as long as the electricity voltage of each country is within this range, but it is worth noting that the frequency is 50 Hz in our country, so other countries may be different, so pay attention to this.

Power supply output voltage/current/power:
The output is generally a range. If the voltage required by the user is within this output range, it is fine. Of course, the output power must be enough.

Mains power factor:
The cosine of the phase difference (Φ) between the voltage and the current is called the power factor. Conceptual things are really troublesome. If you let a liberal arts person see it, you will definitely see that your head will explode or you will not understand. Let me put it this way. There must be voltage, voltage alone is not enough, but also current, because the voltage delivered by the power plant is a little slower than the current, so it leads to some complex concepts, but we are not going to learn this, then we just need to Knowing that the power factor is probably an efficiency thing, the closer the value is to 1, the better the effect. There is a parameter called PFC behind it. What is it used for? It is used to improve the power factor, you will know when you see the parameters behind.

surge:


Surge voltage/current: 1. Input surge current means that the input loop of the power supply has a large surge current during cold start due to its capacitive characteristics, generally 20~60A, and the time does not exceed 20mS. The inrush current of the power supply in the hot state is slightly smaller, and frequent switching of the machine should be avoided to reduce the frequent impact of the power supply and distribution system by high current and injury. 2. The surge withstand capability of the power supply refers to the surge voltage withstand capability of the input terminal (L to N or GND). The surge voltage withstand capability of a 220V power supply is generally 300Vac/5S.

Current accuracy

current harmonics

Output ripple:


Ripple voltage: The ripple voltage of the switching power supply contains two components, one is the double frequency component of the input power supply, with a larger amplitude, and the other is the switching frequency component with a higher frequency (up to several kHz) and its amplitude is smaller (Also known as noise signal). The two components have different effects on different loads. Usually, only the component with the greater impact is taken to deal with it. It is not common for the two components to have a significant impact on the load at the same time.

Safety:


Safety regulations are safety regulations, in order to prevent 6 dangers caused by poor materials, design errors, and misuse of parts (the six dangers are: 1) electric shock; 2) energy hazards; 3) fire hazards; 4) Mechanical and thermal damage; 5) Radiation; 6) Chemical damage. ) and established standards.

The safety regulations include two major product certification directions of the American system and the IEC system.

The American system is represented by UL and CSA (UL/CSA60950-1-03),

European IEC system (EN/IEC60950-1,

my country's GB4943-2001 is equivalent to IEC60950-1999) with CB as the general direction,

The most famous and the EU's CE certification is the most influential. Common safety certifications include CB, CE, UL, FC, TUV, IEC, CAS, CCC, etc.

The safety standards of UL and VDE are essentially different. The UL standard is more concerned with preventing the risk of fire, while the VDE standard is more concerned with the safety of operators. For power supplies, VDE is the most stringent electrical safety standard.

EMC:
EMC is the electromagnetic compatibility requirements of products. EMC=EMI+EMS, EMI is the electromagnetic interference limitation requirement of the product, and EMS is the requirement of the product's resistance to electromagnetic interference. These two requirements are to make the product and the surrounding products compatible with each other in terms of electromagnetic interference and not interfere with each other. The electromagnetic impact of EMC on products is mainly assessed from the EMS resistance to electromagnetic interference, including electrostatic discharge, electrostatic field, radio radiation, pulsed radiation, lightning, radio conduction, power frequency electromagnetic field, power transient resistance, etc. And from the assessment of EMI limit interference, including radio emission/conduction, voltage flicker, harmonics and other interference limits.

PFC


PFC (Power Factor Correction) power factor correction is mainly to improve the ratio of the effective power to the apparent power at the input end of the power supply. Generally, for models without PFC lines, the power factor at the input end is only 0.4~0.6, while those with active PFC lines can reach more than 0.95. The correlation formula is as follows:

Apparent Power = Input Voltage x Input Current (VA)

Active Power = Input Voltage x Input Current x Power Factor (W)

From the point of view of environmental protection: the power plant of the electric power company must generate electric energy greater than the apparent power, so that its generator set can stably supply the market electric energy demand, and the actual use of electric energy is the effective power. If the power factor is 0.5, it means that the generator set generates more than 2VA of electricity to safely supply the demand of 1W of electricity, and its energy operation efficiency is poor. Conversely, if the power factor is improved to 0.95, as long as the generator set of the power company generates more than 1.06VA of electricity, there is no problem in supplying 1W of electricity, and the energy operation efficiency is better.

MTBF:
Mean time between failures (MTBF) and life expectancy (Life Cycle) are important indicators of product reliability. The so-called MTBF (Mean Time Between Failure) is the expected value of reliability estimation, which refers to the average time when the reliability of a product drops to 36.8% after continuous operation for a period of time. MEAN WELL MTBF currently uses the MIL-HDBK-217F standard to estimate the expected value of product reliability (excluding fans) by the part counting method, which refers to the probability that the product can still work normally after continuous use for the counted time. is 36.8% (e-1=0.368). If the product is used continuously for twice the counted MTBF, the probability that it will still work properly is 13.5% (e-2=0.135).

The Life Cycle refers to the temperature rise of the electrolytic capacitor of the product under full load conditions, and the reference value for calculating the life of the electrolytic capacitor. For example, product SP-750-12 MTBF=769.3K hours, capacitor C108 Life Cycle=202.2K hours (Ta=45°C).

Ageing:
It is equivalent to the product coming out and testing whether it can work normally. This test does not mean that the test is OK and it is over, but a long-term test to see if the product can be stable, even in a room with abnormal temperature. The test, as for how long it will take, seems to be at least four hours, depending on the situation.

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What are the characteristics of LED roadway lights? Do you know the installation method and precautions? Take a look!

What are the characteristics of LED roadway lights? Do you know the installation method and precautions? Take a look!

  As people's requirements for lamps are getting higher and higher, a new type of lamps called LED lamps are favored by people. LED is a kind of light-emitting diode. As a light source for illuminants, it has high light efficiency and long life. To achieve multi-purpose lighting, and softened, it will not cause dazzling or other uncomfortable reactions, so many public areas will use this kind of light, such as LED roadway lights, because there are many people on the road, so it is necessary to To install soft lamps that will not hurt the eyes, what are the characteristics of LED road lights? Do you know its installation methods and precautions? Let's follow the editor to learn about it.    Features of LED roadway lights: 1. The color purity of LED roadway lamps is high; at present, LED products cover almost the entire visible spectrum range, and the color purity is high. 2. LED roadway lamps have a long life. The actual life of LED is more than 50,000 hours, which is several times or even dozens of times that of general light sources. 3. The light source of LED roadway lamps does not contain mercury, and the light beam does not contain ultraviolet rays. 4. It is solid luminescence, good shock resistance, firm and reliable. 5. It also has the characteristics of energy saving, economical and maintenance-free. 6. LED has strong luminous directionality, high luminous flux utilization rate, and small size, which is easy to design and control light intensity distribution of LED lamps. 7. LED roadway lamps can be powered by DC low voltage, which is safe and reliable. 8. The LED is not limited by the start-up temperature, it can be started temporarily, usually a few ms, and can temporarily achieve full luminous flux output.   Installation method and precautions of LED roadway lights: 1. Installation method: 1. First, determine the installation position and method of the lamps according to the actual needs of the work site, and then prepare the corresponding length of Φ8~Φ14 mm three-core cables according to the distance from the lamps to the power contacts. 2. Open the set screw on the side of the upper cover of the lamp, then loosen the compression nut of the cable inlet of the lamp, open the upper cover, and lead the power cables through the compression nut to the internal terminal, and connect according to the method shown in the figure. Fix it, and then tighten the cable compression nut and the upper cover of the lamp. 3. The LED roadway lights are enclosure-free. If the lamps themselves are not bright, generally communicate with the manufacturer for direct replacement or return to the factory for maintenance. 2. Notes: 1. The power supply must be cut off before dismantling the lamp. 2. It is strictly forbidden to open it with electricity. 3. During use, the surface of the lamp has a certain temperature rise, which is a normal phenomenon; the center of the transparent part has a high temperature and should not be touched. 4. When installing lamps, the lamps should be safely grounded nearby. The above are the characteristics of LED roadway lights, as well as its installation methods and precautions. Relevant staff must pay attention to the problems during installation to ensure their personal safety.
Warm congratulations to Tanso Optoelectronics for obtaining four product safety and explosion-proof certificates!

Warm congratulations to Tanso Optoelectronics for obtaining four product safety and explosion-proof certificates!

Warm congratulations to Tanso Optoelectronics for obtaining four product safety and explosion-proof certificates!
DGS51/127LW (A) mining explosion-proof LED tunnel induction light

DGS51/127LW (A) mining explosion-proof LED tunnel induction light

DGS51/127LW (A) mining explosion-proof LED tunnel induction light is a specially designed lighting device used to provide reliable lighting effects in mining tunnels. This lamp adopts LED technology and has an explosion-proof design, which can operate safely in harsh environments such as humidity, dust, and explosive gases.

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