The LED power supply made by the constant current type control IC represented by the 9910 series is actually current limiting, and the control is relatively simple. Strictly speaking, it is not the mainstream mode of switching power supply control. The mainstream mode of switching power supply control must be Benchmarks and op amps. But this IC can only be used for LEDs, it is difficult to use for other things, just because LEDs have very low ripple requirements. But because it is only used for LED, so the price is higher now. Basically, it is made by using 9910 plus MOS tube. The output is electroless. Generally, I see that many people use the word inductor to do the power conversion inductor. This kind of power supply, the chip of the general manufacturer. There are pictures on the data, basically all of them are buck. I don't say much, and there are more people who are better than me.
The second is based on me, that is, the constant current driver of the switching power supply control mode. This is the common switching power supply chip as the core conversion device, such a lot of chips, such as PI's TNY series, TOP series, ST's VIPER12, VIPER22, Fairchild's FSD200, etc., even using only triode or MOS tube RCC, etc. can be done. The benefits are low cost and good reliability. Because the ordinary switching power supply chip is not only good price, but also a classic product that has been used extensively. Such an IC is generally integrated with a MOS tube, which is more convenient than the 9910 plus MOS, but the control method is more complicated, and it is necessary to add a constant current control device, and a triode or an operational amplifier can be used. The magnetic component can be used with a word inductor or a gas. High frequency transformer with gap.
I love to use a transformer, because the cost of the inductor is very low, but I don't think it has the ability to load, and the adjustment is not flexible. Therefore, I think the better device choice is that the common integrated MOS switching power supply chip plus high-frequency transformer is the most ideal choice in terms of performance and cost. It does not need to use any constant current IC, that kind of thing, Not easy to use, expensive.
Finally, to say, the most important way to distinguish between these two power supplies is to see if their output has electrolytic capacitors for filtering.
About the power supply problem
Whether it is to do the current limiting constant current control power supply or the op amp controlled constant current power supply, the power supply problem must be solved. That is, when the switching power supply chip works, it needs a relatively stable DC voltage to supply power to its chip. The operating current varies from one MA to several MAs. There is a kind of FSD200, NCP1012, and HV9910. This kind of chip is high-voltage self-feeding. It is convenient to use, but high-voltage feeding causes the IC heat to rise because the IC has to withstand about 300V DC, as long as it has a little current. Even if it is an MA, it has zero damage of zero watts. Generally, the LED power supply is only about ten watts. If you lose a few watts, you can pull down the power efficiency by a few points. There is also a typical QX9910. Use the resistor to pull down the power, so the loss is on the resistor. Lose it a few watts. There is magnetic coupling, which is to use a transformer to add a winding to the main power coil, just like the auxiliary winding of the flyback power supply, so as to avoid losing the power of a few watts. This is why I don't isolate the power supply. One of the reasons for using a transformer is to avoid the loss of the power of a few watts, and to raise the efficiency a few points.
Introduction to the design method of non-isolated buck power supply
Non-isolated step-down type is the commonly used power supply structure, which accounts for almost 90% of the fluorescent lamp power supply. Many people think that there is only one type of step-down type that does not isolate the power supply. I want to say that the lamp is not safe - after the power supply is damaged. In fact, the buck type is only one kind, there are two basic structures, namely, boost, and buck-boost, that is, BOOST AND BUCK-BOOST, the latter two power supplies even Damage. It does not affect the LED and has this benefit.
Now LED fluorescent lamp power supply, the manufacturer of the lamp is generally required to be placed in the lamp tube, such as the T8 lamp tube. A small part of the external. Do not know why this is the case. In fact, the built-in power supply is difficult to do, the performance is not good. But I don't know why there are so many people asking for it. It may be down with the wind. The external power supply should be said to be more scientific and more convenient. But I also have to follow the wind, what the customer wants, what do I do? However, it is quite difficult to do the built-in power supply. Because the external power supply has almost no shape, it doesn't matter how big it is to be done. The built-in power supply can only be made into two types, one of which is the most used, that is, placed under the light board and placed on the light board.
The following is the power supply, so the power supply is required to be very thin, otherwise it can not be installed. And this can only cause the components to fall down, and the line on the power supply is only lengthened. I don't think this is a good way. But everyone generally likes to do this. I will do it. There is less use, put the two ends, that is, placed on both ends of the lamp, so that it is better to do something, and the cost is lower. I also have I have done it, basically these two built-in shapes.
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