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As a new light source, research on LED power supplies and drive circuits has been in the ascendant in recent years by major companies and research institutes. Unlike electronic ballasts for fluorescent lamps, the main function of the LED driver circuit is to convert the AC voltage to a DC voltage and simultaneously match the voltage and current of the LED. As the silicon integrated circuit power supply voltage drops linearly, the LED operating voltage is more and more in the optimal range of the power supply output voltage. Most of the low-voltage IC power supply technologies are also suitable for powering LEDs, especially high-power LEDs. . In addition, the LED power supply should also be able to take advantage of the economies of scale brought about by the gradual increase in the output of low-voltage IC power supplies.
First, the main technical overview of LED power supply and drive circuit
1) Voltage conversion technology
Power supply is an important part of the reliability and adaptability of LED light sources. At present, the mains electricity in China is 220V AC, and the LED light source is a semiconductor light source, which is usually powered by DC low voltage. This requires AC-DC conversion circuit in or outside of these lamps to adapt to the characteristics of LED current drive. At present, the power supply selection methods include switching power supply, high-frequency power supply, and capacitor rectification and rectification power supply. Various options are selected according to different requirements such as current stability, transient overshoot, and safety and reliability.
2) Life and cost of power supply and drive circuit
In terms of LED life, although the life of a single LED itself is as long as 100,000 hours, its application must be matched with a power conversion circuit. Therefore, the overall life of an LED lighting device must be considered from the optoelectronic integration application. However, for lighting LEDs, in order to meet the matching requirements, the life of the power supply and the drive circuit must exceed 100,000 hours, making it no longer a bottleneck factor for semiconductor lighting systems. Considering the long life and not adding too much cost, the life and cost of the power supply and drive circuit should not exceed one third of the total cost of the lighting system. In the early stage of the development of semiconductor lighting products, the power supply must be balanced. The relationship between the life of the drive circuit and the cost.
3) Programmable technology for drivers
A significant feature of LEDs as light sources is their ability to maintain lumens efficiency even at low drive currents, while also for RGB polymorphs.
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