In 2015, the “photovoltaic engine†in the LED industry was very popular. The high-voltage linear constant current chip, rectifier bridge stack and high-voltage lamp bead were produced on the same board, which greatly saved labor and reduced cost. In a photo-integrated module, the performance of a high-voltage linear constant-current chip determines the performance of the entire module so as to extend throughout the luminaire.
LED power drive changes:
LED drive power, from the early isolation switch constant current power supply, to non-isolated switching constant current power supply, until today's high-voltage linear constant current is popular, the time is three years. Undoubtedly, the fierce market competition, the pressure of labor costs, the demand for large-scale production, etc., all require innovation in driving power technology.
Today's LED driver power supply market is a three-legged situation of isolation, non-isolation, and high-voltage linearity, each with its own market application. In a short period of time, no one can replace anyone, but it is undeniable that high-voltage linear drive applications are increasingly accepted by the industry.
The IC design company has continuously strived to integrate the peripheral functions of the traditional constant current driving power chip into the chip. Due to the power volume, temperature, and mold requirements, many functions have been integrated into the IC, which makes the design of the power supply scheme more and more simple, fewer peripheral devices, and lower production costs. The high-voltage linear drive IC, in the design of the program, saves the magnetic components, without electrolysis, that is, what everyone calls "de-energization", which is a crucial step for the popularity of the photoelectric engine.
The excellent characteristics of high PF and low THD are characteristics of high voltage linear constant current driving IC. Without the electrolysis scheme, the life of the LED lamp can be greatly extended, the application scheme is simple but the performance is still excellent, and it can meet the high specification market of Europe and the United States, and is a good choice for the indoor lighting power supply scheme.
The trouble of high voltage linear constant current IC:
At present, the high-voltage linear constant current uses a segmented lighting method to drive the high-voltage lamp beads, generally adopting the methods of one segment, three segments, four segments, etc., the more the segmentation, the higher the efficiency. Similarly, the more segments, the more complex the line is, which is not conducive to scale production.
A large number of bulbs in the market are mostly driven by a segment of 1 segment, and the IC has a built-in MOS to meet the needs of indoor low-power lighting. At the same time of low cost, it is very suitable for the production of integrated optical modules, and it is easy to arrange the lines.
However, in a specific environment, when the 220V AC power of the power grid fluctuates, the high-voltage linear electroless scheme will flash, commonly known as “flashingâ€. For example, supermarkets, health clubs, T-tube fluorescent lamps, bulbs. Due to the use of high-power electrical appliances, voltage instability is also caused, resulting in flashover. This will bring visual trouble to the user. Based on the principle of single-stage high-voltage linearity, the applicable voltage range is limited. Generally, the input voltage range of the 1-stage high-voltage linear scheme is about 200-260V, which is easy to appear "flashing" in areas where the voltage of the urban-rural junction is unstable.
We have found that if the high-voltage linear constant current IC is designed as a two-stage segmented lighting method, the appearance of "flashing" can be improved. Its principle is: reduce the voltage threshold of the lamp bead operation, even when the line voltage input of 180V, the first segment can be turned on, then 70% of the lamp bead is still normal working light does not appear to flash, People's vision will not be affected. The advantage of the 2-segment segmentation is that the circuit design of the lamp bead is almost the same as that of the 1st segment, but the voltage adaptation range is increased by 50%. Yacheng's RM9008E IC is specially designed for two-stage lighting, which greatly improves the phenomenon of “flashingâ€. At the same time, the dynamic over-temperature protection function of the IC itself can effectively suppress the flashing of the light.
RM9008E typical application
Typical specification
As for the problem of strobe, the industry has been arguing for a long time. First of all, it cannot be judged by the camera as a standard. Secondly, under the application environment, the human eye is far away from the lamp 50CM or more, and no stroboscopic light is detected, which has no effect on the human eye. Finally, adding a small chip capacitor can eliminate strobe, and even if the capacitor is damaged, there will be no dead light.
High-voltage linear constant current IC for high power:
With the continuous advancement of IC process technology, the stability of constant current IC under high voltage line has been greatly improved. Not only in the indoor low-power lighting solutions have a wide range of applications, but also in the medium and high power. A single IC can be used in parallel for more than 30W applications. At the same time, if you use the extrapolated MOS method, you can achieve a 100W lighting solution with a single IC.
Nowadays, the power supply of LED high-power lighting system is mainly the solution of isolated switching power supply. It is always troubled by temperature. The life of electrolysis is always a problem to be considered. In the past, due to the process limitation of the supporting equipment of the lamp, high-voltage linearity could not be adopted. The solution, but with the application of high thermal conductivity plastics and the improvement of insulation performance, the high voltage linear scheme has also entered the ranks of high power solutions.
Yachengwei's RM9000S lighting system solution can greatly increase the life of the floodlights, and the cost is also reduced a lot: this solution does not require electrolytic capacitors, that is, a chip, external high-voltage MOS tube, plus a few resistors. At the same time, the RM9000S also reserves a port for remote intelligent control.
RM9000S 84W Wall Washer Solution:
The pursuit of LED is simple, durable, cost-effective, and the development of high-voltage linear constant current has just begun, and the space for technological improvement is still very large. At present, the input voltage range can only be a constant voltage input. When the range is exceeded, the brightness (current) adjustment will occur; the lamp bead is lit up, the usage of the lamp bead needs to be increased, and the increase of the capacitance can eliminate the stroboscopic, but the power factor will reduce;. Further improvements are needed in the areas of resistance to surges and lightning strikes. In any case, the application of high-voltage linear constant current IC has become the main popular column of power supply. With the efforts of engineers and technicians, it will surely usher in a spring! (This article is a sub-submission of Yacheng)
LED power drive changes:
LED drive power, from the early isolation switch constant current power supply, to non-isolated switching constant current power supply, until today's high-voltage linear constant current is popular, the time is three years. Undoubtedly, the fierce market competition, the pressure of labor costs, the demand for large-scale production, etc., all require innovation in driving power technology.
Today's LED driver power supply market is a three-legged situation of isolation, non-isolation, and high-voltage linearity, each with its own market application. In a short period of time, no one can replace anyone, but it is undeniable that high-voltage linear drive applications are increasingly accepted by the industry.
The IC design company has continuously strived to integrate the peripheral functions of the traditional constant current driving power chip into the chip. Due to the power volume, temperature, and mold requirements, many functions have been integrated into the IC, which makes the design of the power supply scheme more and more simple, fewer peripheral devices, and lower production costs. The high-voltage linear drive IC, in the design of the program, saves the magnetic components, without electrolysis, that is, what everyone calls "de-energization", which is a crucial step for the popularity of the photoelectric engine.
The excellent characteristics of high PF and low THD are characteristics of high voltage linear constant current driving IC. Without the electrolysis scheme, the life of the LED lamp can be greatly extended, the application scheme is simple but the performance is still excellent, and it can meet the high specification market of Europe and the United States, and is a good choice for the indoor lighting power supply scheme.
The trouble of high voltage linear constant current IC:
At present, the high-voltage linear constant current uses a segmented lighting method to drive the high-voltage lamp beads, generally adopting the methods of one segment, three segments, four segments, etc., the more the segmentation, the higher the efficiency. Similarly, the more segments, the more complex the line is, which is not conducive to scale production.
A large number of bulbs in the market are mostly driven by a segment of 1 segment, and the IC has a built-in MOS to meet the needs of indoor low-power lighting. At the same time of low cost, it is very suitable for the production of integrated optical modules, and it is easy to arrange the lines.
However, in a specific environment, when the 220V AC power of the power grid fluctuates, the high-voltage linear electroless scheme will flash, commonly known as “flashingâ€. For example, supermarkets, health clubs, T-tube fluorescent lamps, bulbs. Due to the use of high-power electrical appliances, voltage instability is also caused, resulting in flashover. This will bring visual trouble to the user. Based on the principle of single-stage high-voltage linearity, the applicable voltage range is limited. Generally, the input voltage range of the 1-stage high-voltage linear scheme is about 200-260V, which is easy to appear "flashing" in areas where the voltage of the urban-rural junction is unstable.
We have found that if the high-voltage linear constant current IC is designed as a two-stage segmented lighting method, the appearance of "flashing" can be improved. Its principle is: reduce the voltage threshold of the lamp bead operation, even when the line voltage input of 180V, the first segment can be turned on, then 70% of the lamp bead is still normal working light does not appear to flash, People's vision will not be affected. The advantage of the 2-segment segmentation is that the circuit design of the lamp bead is almost the same as that of the 1st segment, but the voltage adaptation range is increased by 50%. Yacheng's RM9008E IC is specially designed for two-stage lighting, which greatly improves the phenomenon of “flashingâ€. At the same time, the dynamic over-temperature protection function of the IC itself can effectively suppress the flashing of the light.
RM9008E typical application
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Typical specification
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As for the problem of strobe, the industry has been arguing for a long time. First of all, it cannot be judged by the camera as a standard. Secondly, under the application environment, the human eye is far away from the lamp 50CM or more, and no stroboscopic light is detected, which has no effect on the human eye. Finally, adding a small chip capacitor can eliminate strobe, and even if the capacitor is damaged, there will be no dead light.
High-voltage linear constant current IC for high power:
With the continuous advancement of IC process technology, the stability of constant current IC under high voltage line has been greatly improved. Not only in the indoor low-power lighting solutions have a wide range of applications, but also in the medium and high power. A single IC can be used in parallel for more than 30W applications. At the same time, if you use the extrapolated MOS method, you can achieve a 100W lighting solution with a single IC.
Nowadays, the power supply of LED high-power lighting system is mainly the solution of isolated switching power supply. It is always troubled by temperature. The life of electrolysis is always a problem to be considered. In the past, due to the process limitation of the supporting equipment of the lamp, high-voltage linearity could not be adopted. The solution, but with the application of high thermal conductivity plastics and the improvement of insulation performance, the high voltage linear scheme has also entered the ranks of high power solutions.
Yachengwei's RM9000S lighting system solution can greatly increase the life of the floodlights, and the cost is also reduced a lot: this solution does not require electrolytic capacitors, that is, a chip, external high-voltage MOS tube, plus a few resistors. At the same time, the RM9000S also reserves a port for remote intelligent control.
RM9000S 84W Wall Washer Solution:
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.jpg)
The pursuit of LED is simple, durable, cost-effective, and the development of high-voltage linear constant current has just begun, and the space for technological improvement is still very large. At present, the input voltage range can only be a constant voltage input. When the range is exceeded, the brightness (current) adjustment will occur; the lamp bead is lit up, the usage of the lamp bead needs to be increased, and the increase of the capacitance can eliminate the stroboscopic, but the power factor will reduce;. Further improvements are needed in the areas of resistance to surges and lightning strikes. In any case, the application of high-voltage linear constant current IC has become the main popular column of power supply. With the efforts of engineers and technicians, it will surely usher in a spring! (This article is a sub-submission of Yacheng)
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