Main methods of combining LED control with AC power supply-EEWORLD

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At present, the AC power supply combined with control methods mainly include the following:

1. Primary feedback power supply. This technology is used to drive low-power LED lamps and is transplanted from the original primary feedback charger switching power supply. This part of the AC driver has not changed its specifications due to LED applications, and there are many models to choose from. Except for the limited size, there is no essential difference in design from the switching power supply, and it is reasonable to use LED.

2. High-power isolated lighting power supply. In this technology, all LED drivers are designed with switching power supplies. No company has launched AC drive devices dedicated to LEDs so far. The isolated power supply is the switching power supply. It can be basically asserted that the switching power supply is LED-AC drive, which is also one of the main application methods;

3. Non-isolated LED driver power supply. Non-isolated LED drivers have launched more targeted power supply technologies, which is worthy of recognition and is a direction for LED power supplies. Isolation safety mainly depends on the design of the creepage clearance with the shell. There is no requirement that the LED power supply must be isolated, and there is no limit on the output voltage value. The key is which isolation is safer. Non-isolation has the advantages of high driving efficiency, and the combined structure can also design high-quality, safe and efficient LED products.

4. Thyristor dimming compatible power supply. This technology has special applications and limited quantity, and is a transitional technology.

In the current mainstream AC power supply market, the focus is on the first three items. Among them, non-isolated technology has developed rapidly. The first two isolated LED driver designs are transplanted switching power supply chips, and essentially have not deviated from the original mode of switching power supply. Although many experts and scholars from various companies are committed to the research of LED lighting power supply, the current technology still remains at the switching power supply stage. For this reason, the main research focus of LED lighting power supply should be on the secondary DC part, combining constant voltage switching power supply with distributed constant current technology.

Keywords：LED Reference address：Main methods of combining LED control with AC power supply

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