In the case of mains power, of course, it is best to adopt the AC-DC direct constant current output scheme.

However, most of these solutions can only provide low power output (<40W). Currently, only TOP250YN from Power Integration in the United States can provide a 75W power output solution. But its circuit is very complex, expensive, and has low flexibility. Although domestic Maoshuo Company also provides direct constant current output power supply, it usually only has a single output. If you want multiple channels, you must customize them (number of channels and current per channel). On the one hand, it has increased costs, and any future changes will be very troublesome.

So in the case of mains power, it is best to first use a constant voltage power supply for voltage stabilization and then use multiple constant current modules for constant current. The biggest benefit of doing so is that it can achieve the highest efficiency under various LED connection architectures. Because the output voltage of a constant voltage source can be arbitrarily selected to achieve * * * matching. And it has high flexibility and is easy to change its combination.

The constant voltage source of commercial power is a very mature product, which usually has the following advantages:

1. Wide input voltage range, suitable for different voltage specifications in various countries.

2. High efficiency, usually able to achieve over 90%.

3. High power factor, usually above 0.99

4. It has anti surge measures and can withstand lightning strikes of over 4kV, which can protect the subsequent circuits.

5. Equipped with comprehensive overcurrent, overvoltage, short circuit, and overvoltage protection functions

6. Low cost

The biggest advantage is that it is easy to choose its output voltage to be close to the load voltage and achieve the highest efficiency