Light-emitting diodes ( LEDs ) have the characteristics of power saving and no need for frequent maintenance, and have become the mainstream of street lamps and other high-power lighting applications. Although the LED lighting driving method is all-encompassing, in order to meet the market demand for higher efficiency and lower system cost, it is imperative to drive multiple LED strings with a new simple topology circuit.
Observing the trend of streetlights or high-altitude lights for stadiums, as well as other high-power lighting applications, is gradually turning to solid-state lighting using light-emitting diodes (LEDs) as a light source, mainly because LEDs are more energy efficient and less Frequent maintenance needs, and these two factors also prove that such a turn is indeed necessary.
In such high-power lighting applications, various methods are currently being considered to drive these lights. This article will discuss a new topology that can drive multiple LED strings with higher efficiency and lower system cost. . To fully understand the benefits of this topology, we will first explore the various approaches that are currently considering solutions or that have worked well in low-power LED applications.
Driving multiple LED strings for efficiency and / series solutions have their pros and cons
The easiest way to drive multiple LED strings is to use a power supply that converts the supply voltage to a direct current (DC) output voltage (such as 12 volts or 24 volts) and then drives the parallel LED string with this power supply. A resistor is used in each string to regulate the current. This method is very low cost, but today's high-brightness LEDs consume more than 350 milliamps (mA), so the loss of this method is extremely high, resulting in low efficiency, and the current regulation effect is not good, so the string of lights The difference in light between the two is extremely obvious.
To improve this method, a linear regulator must be used instead of a resistor to improve the light output consistency of all strings. However, this only allows the light output to be consistent, while efficiency or power consumption is not significantly improved. For the longest LED life, it is important to reduce power consumption. In both methods, the use of a resistor or linear regulator as a fixed heat source significantly reduces the life of the LED.
Another equally simple method is to make a long single series string and use a single power source that produces a high voltage DC stabilized current source. The high-voltage operation of this method will reach the 60VDC or 42V RMS safe low voltage (SELV) level, and the lighting equipment or accessories must be approved by the safety mechanism, thus making the same motor design The flexibility of other applications is greatly reduced.
Another consideration in the single string method is reliability. If only one LED is turned on, the light output of the entire lighting device is released. Although many arc-extinguishing circuits or devices can be added to control the opening of each LED, this adds cost and complexity to the luminaire.
With a constant current of IC, the working voltage of the IC is 12-24V. As long as the voltage is not lower than the rated voltage, the current of each led beacon will be consistent.It is made of high-brightness LED (LED is made of imported chip---high brightness, good electrical).
No pressure drop can be achieved over a specific length and voltage.Suitable for urban lighting projects,home decoration, bars, dance halls, cars, indoor/outdoor advertising and interior and exterior contours of various high-end venues
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