5/18/2018

What does the LED initial code mean? A high and low level intelligent control LED circuit design

1, A - company name: The company abbreviated name "XM" said.
2. B - Light name: The first letter of the Chinese Pinyin with the first two characters of the ceiling light is indicated by the capital letter "DT";
3, C - luminous color code: LED's luminous colors are mainly red (Red), yellow (Yellow), blue (Blue), green (Green), white (White) these are used "R", " Y", "B", "G", "W" indicate.
4, D - use the lamp model: Currently used for flexible light bar LED is generally 3528 and 5050 two, divided by another "35" and "50" to indicate.
5, E - represents the number of lamp beads per meter of light: There are generally 60PCS/M and 120PCS/M two, respectively, with "06" and "12" to indicate.
6, F - on behalf of waterproof and non-waterproof two: waterproof plus "F" for identification, not waterproof without this one







A, the company code XM.
B, indicates that the product type is high power.
C, appearance shape (substrate) code: E, no heat plate. S, star base plate. R, round substrate. F, square base plate.
D, bracket code: bracket code.
E, wafer specification code: wafer manufacturer and chip code.
F, luminous color: Y yellow, R red, G green, B blue, PW is white, WW warm white.
G, Power: How much is W's lamp, how much to write.
Lens shape: L120°, M140°, K80°, N-lantern, P60, Q90°, X80° funnel-shaped, T without lens.




High-power LED as an illumination source has the advantages of small size, low power consumption, low heat generation, long service life, fast response speed, safe low voltage, good weather resistance, good directionality, and the like. The cover can be made of PC tube, with a high temperature resistance of 135 degrees. , low temperature - 45 degrees
1. Service life: High-power LED lamp life up to 50,000 hours
2. Energy saving: Save more than 80% of electricity compared to high-pressure sodium lamps 3. Green and environmental protection. High-power LED street lamps do not contain lead, mercury and other pollution elements, without any pollution to the environment
4. Security: impact resistance, strong shock resistance, led light in the visible range, no ultraviolet (UV) and infrared (IR) radiation. No filament and glass enclosure, no problem of fragmentation of the traditional lamp, no harm to the human body, no radiation;
5. No high pressure, no dust. Eliminates the decrease in brightness caused by the blackening of the lamp shade due to high-pressure absorption of dust by ordinary street lamps;



6. Without high temperature, the lampshade will not be yellowed. Eliminating the degradation of brightness and shortening of life caused by the yellowing of ordinary street lamps caused by high temperature baking lamps;
8. Start without delay. Led in nanoseconds, power up to normal brightness, without waiting, eliminating the long-term start-up process of traditional LED street lights;
9. No flicker. The pure DC work eliminates the visual fatigue caused by the traditional street lamp stroboflash.
10. No adverse glare. Eliminate the glare, visual fatigue and line-of-sight disturbance caused by the bad glare of ordinary high-power LED street lamps, improve the driving safety and reduce the occurrence of traffic accidents.
11. Flexibility - The exquisiteness of the LED light source enables the LED lamp to adapt to various geometrical dimensions and different space-size decorative lighting requirements, such as point, line, surface, ball, different forms, and even any kind of artistic lighting sculpture ;
12. Pure color - the color produced by the semiconductor PN junction itself, pure, thick; rich colors - three primary colors plus digital technology, can evolve any color;


Level intelligent control LED circuit module design:
Since the invention of the LED more than 30 years ago, its luminous efficiency has steadily increased, and the increase in conversion efficiency has been achieved in both directions. Some high-brightness, high-efficiency LEDs exhibit significant photovoltaic effect, such as HP's HLMP-EG30-NR000 is a red light emitter encapsulated in a transparent housing. The circuit in the figure shows how to use the photovoltaic properties of the LED. When using the same components, this circuit can also work with the old red LED, but the light output is low. The circuit of this design example describes an LED circuit that can be self-controlled and can determine whether it is on or off, in addition to its own characteristics, without any light sensor assistance. When the LED is blocked, it turns on, and when it shines it, it turns off. The main components of the circuit include LED D1 operational amplifier IC1, monostable IC2A, and transistor switch Q1 controlling the current through the LED.


When blocked, the LED does not generate photovoltaic current. When there is moderate light (for example, in an office or laboratory), 50 millivolts to 100 millivolts can be generated on 4.7 M[Omega] load resistors. The comparator op amp IC1 compares the voltage produced by the LED to a threshold reference voltage of about 50 millivolts. Changing the resistance of the resistors R1 and R2 connected to the voltage divider on IC1 pin 2 can change the sensitivity threshold of the circuit.
When the ambient light weakens, the LED produces a lower voltage. When the voltage is below the 50 mV threshold, the output of the op amp goes low, triggering the monostable IC2A. Monostable turns transistor Q1 on for an interval, and the LED emits light for about 3 milliseconds until the monostable output goes low. In a dark room, this cycle repeats at a rate of 200 Hz, and the LED flashes repeatedly with a short period. At high refresh rates, the LEDs appear to glow continuously.
In the daylight state, the current source of the circuit mainly includes the current that drives the reference bias network: 3.6V/162 kΩ=22 mA. In daytime and night mode, the LED consumes several milliamperes of current when it is emitting light. A battery at 1 ampere can supply power to the circuit for several months. Increasing the R1 and R2 values ​​also reduces the current. Because this circuit consumes low current intermittently in a well-lit environment, the lifetime of a 1 ampere-hour lithium battery should be close to its storage life.

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