The new LED intelligent constant current driver - also talk about the "unconditional constant current" into "conditional constant current" In the LED industry, it is well known that using constant current source to supply LED power is the best power supply solution. In recent years, a variety of constant current drives have emerged. Many manufacturers started from the definition of "constant current" and grafted the technology and experience of producing constant voltage power for many years to the constant current driver to produce a constant current driver with high constant current accuracy and good performance indicators.
The stability of the output current of the constant current driver is mainly affected by factors such as power supply voltage fluctuation, LED load change, and ambient temperature change. The constant current driver uses the current negative feedback principle of LED current sampling to eliminate the influence of various interference factors on the constant current value. It is called a high precision constant current driver. We call it an unconditional constant current driver.
Is the high-precision unconditional constant current driver the best driver for LEDs? Actual use indicates that the answer is no. Because its performance does not fully meet the requirements of LED. In the condition of power supply voltage fluctuation and LED load change, in order to stabilize the LED operation, constant current is necessary, but when the ambient temperature changes, it is not correct to maintain constant current.
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analyse as below:
LEDs are semiconductor components that are sensitive to temperature and have certain temperature characteristics. Figure 1 is the curve of the LED operating current and ambient temperature provided by the LED manufacturer (shown by the solid line). It indicates that in order to make the LED junction temperature not exceed the maximum allowable value (about 100 ° C), the operating current of the LED should decrease with the increase of the ambient temperature. In response to the actual requirements of LEDs, we have tailored an LED dedicated constant current driver for the LED - "Intelligent Constant Current Driver". It can maintain constant current under the condition of fluctuation of power supply voltage and LED load, and when the ambient temperature rises, the constant current value will drop automatically (about -0.3%/°C) and the required value of LED is close (dot Line shown). In order to distinguish from unconditional constant current, we call this new constant current method a conditional constant current.
The use of conditional constant current can prevent the LED from being overheated in a high temperature environment, avoiding the reduction of light efficiency and speeding up the light, and achieving the purpose of prolonging the service life of the LED.
The output characteristics of the unconditional constant current (shown by the horizontal dashed line) and the output characteristics of the conditional constant current (shown by dotted lines) are also shown in FIG. They are compared: the unconditional constant current overload starting temperature t1 is lower than the conditional constant current overload starting temperature t2; the unconditional constant current of the LED overload is much higher than the conditional constant current.
Unconditional constant current, LED is a working current in winter and summer, and conditional constant current winter, summer LED working current is not the same, summer working current will automatically reduce summer working environment temperature is high, it is unfavorable for LED heat dissipation, appropriately reduce its The working current is very reasonable.
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Some people may ask: Reduce the LED operating current will reduce the brightness of the LED? The answer is: 1. When the temperature is high, the working current is appropriately reduced, the LED is prevented from being seriously overloaded, and the service life is greatly extended. Even if the brightness is slightly lowered, the trade-offs are worthwhile.
2. From the relationship between the luminous flux and junction temperature of the LED output of Figure 2, it can be seen that when the operating current decreases and the junction temperature decreases, the luminous efficiency of the LED increases, and the luminous flux also increases (about -0.8%/°C), which gives A certain amount of compensation is given due to a decrease in luminous flux caused by a drop in operating current. In fact, the brightness of the LED is not significantly reduced, and the normal operation of the LED lamp is almost invisible to the naked eye.
According to the innovative design concept of “conditional constant currentâ€, we have produced five series of products such as 0.35A, 0.5A, 0.7A, 0.9A and 1.5A.
Their common feature is: "three high."
1. High working reliability The constant current driver has many protection functions such as short circuit, open circuit, open circuit and anti-shock, reverse connection, anti-overheating, etc. (the first two protection drivers, the last three protection LEDs) ensure the constant current driver. And the use of LED lights under various working conditions is safe. In particular, we have broken through the problem of “opening and then connecting with anti-shock†protection and applied for national patents. Short circuit, open circuit protection power consumption <1W. Working temperature rise <20 °C. The service life is 20,000 hours, about 5 years.
Second, the highest conversion efficiency of the energy-efficient constant current driver is 93%; the power factor is >0.9.
Third, high cost performance, low cost, low price, called "good quality and cheap."
The intelligent constant current driver output power range is 25W-120W, which is mainly used for high-power LED street lamps.
Previous: Mitsubishi Chemical Machinery is involved in LED lighting business, fluorescent lighting type LED lighting with variable illumination direction Next: Beijing lighting market energy-saving lamps gradually replace incandescent lamps
The stability of the output current of the constant current driver is mainly affected by factors such as power supply voltage fluctuation, LED load change, and ambient temperature change. The constant current driver uses the current negative feedback principle of LED current sampling to eliminate the influence of various interference factors on the constant current value. It is called a high precision constant current driver. We call it an unconditional constant current driver.
Is the high-precision unconditional constant current driver the best driver for LEDs? Actual use indicates that the answer is no. Because its performance does not fully meet the requirements of LED. In the condition of power supply voltage fluctuation and LED load change, in order to stabilize the LED operation, constant current is necessary, but when the ambient temperature changes, it is not correct to maintain constant current.
LEDs are semiconductor components that are sensitive to temperature and have certain temperature characteristics. Figure 1 is the curve of the LED operating current and ambient temperature provided by the LED manufacturer (shown by the solid line). It indicates that in order to make the LED junction temperature not exceed the maximum allowable value (about 100 ° C), the operating current of the LED should decrease with the increase of the ambient temperature. In response to the actual requirements of LEDs, we have tailored an LED dedicated constant current driver for the LED - "Intelligent Constant Current Driver". It can maintain constant current under the condition of fluctuation of power supply voltage and LED load, and when the ambient temperature rises, the constant current value will drop automatically (about -0.3%/°C) and the required value of LED is close (dot Line shown). In order to distinguish from unconditional constant current, we call this new constant current method a conditional constant current.
The use of conditional constant current can prevent the LED from being overheated in a high temperature environment, avoiding the reduction of light efficiency and speeding up the light, and achieving the purpose of prolonging the service life of the LED.
The output characteristics of the unconditional constant current (shown by the horizontal dashed line) and the output characteristics of the conditional constant current (shown by dotted lines) are also shown in FIG. They are compared: the unconditional constant current overload starting temperature t1 is lower than the conditional constant current overload starting temperature t2; the unconditional constant current of the LED overload is much higher than the conditional constant current.
Unconditional constant current, LED is a working current in winter and summer, and conditional constant current winter, summer LED working current is not the same, summer working current will automatically reduce summer working environment temperature is high, it is unfavorable for LED heat dissipation, appropriately reduce its The working current is very reasonable.
2. From the relationship between the luminous flux and junction temperature of the LED output of Figure 2, it can be seen that when the operating current decreases and the junction temperature decreases, the luminous efficiency of the LED increases, and the luminous flux also increases (about -0.8%/°C), which gives A certain amount of compensation is given due to a decrease in luminous flux caused by a drop in operating current. In fact, the brightness of the LED is not significantly reduced, and the normal operation of the LED lamp is almost invisible to the naked eye.
According to the innovative design concept of “conditional constant currentâ€, we have produced five series of products such as 0.35A, 0.5A, 0.7A, 0.9A and 1.5A.
Their common feature is: "three high."
1. High working reliability The constant current driver has many protection functions such as short circuit, open circuit, open circuit and anti-shock, reverse connection, anti-overheating, etc. (the first two protection drivers, the last three protection LEDs) ensure the constant current driver. And the use of LED lights under various working conditions is safe. In particular, we have broken through the problem of “opening and then connecting with anti-shock†protection and applied for national patents. Short circuit, open circuit protection power consumption <1W. Working temperature rise <20 °C. The service life is 20,000 hours, about 5 years.
Second, the highest conversion efficiency of the energy-efficient constant current driver is 93%; the power factor is >0.9.
Third, high cost performance, low cost, low price, called "good quality and cheap."
The intelligent constant current driver output power range is 25W-120W, which is mainly used for high-power LED street lamps.
Previous: Mitsubishi Chemical Machinery is involved in LED lighting business, fluorescent lighting type LED lighting with variable illumination direction Next: Beijing lighting market energy-saving lamps gradually replace incandescent lamps
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