Introduction to the design method of non-isolated buck power supply

The non-isolated buck is a commonly used power supply structure that 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. When it comes to isolation, it is thought to be a step-down type. It is thought 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, even if the latter two power supplies are damaged. It does not affect the LED and has this benefit.

Now LED fluorescent lamp power supply, manufacturers of lamps are generally required to be placed in the lamp, such as in the T8 lamp. Very few are external. I don't know why it is like this. In fact, the built-in power supply is difficult to do, and 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 go with the wind, what the customer wants, I will do. But doing the built-in power supply is quite difficult. Because the external power supply, the shape is basically not required, how much you want to do, and what shape you want to make does not matter. 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 will not fit. Moreover, the component can only be dropped, and the line on the power supply is only lengthened. I don't think this is a good idea. However, everyone generally likes to do this. I will do it. There is also less use, put the two ends, that is, placed on both ends of the lamp, so that it is better to do, the cost is lower. I have also done it, basically the two built-in shapes.