Single-phase inverter (Ultraman series 1)

Chip description:

      Don't ask me why I don't use IR2104. The question is to support domestic production (actually I have no money). IR2104 is too expensive, costing more than ten yuan a piece. Two pieces are used here, which is 30 yuan, so I will go bankrupt right there! So everyone should focus on the EG2104 (ten pieces are worth one piece, delicious!!) The following is the description of the EG manual. It can be seen that the chip is still very good and compatible with 3.3V! ! In addition, this design manual is entirely in Chinese! For a novice like me, this is very friendly! !

My schematic diagram of the MOS tube said IRF100, but I didn't have the 100 on hand at the time, only the 640, so I just took it and used it. The prices of these two 10PCS ones in the mall are almost the same, so you can use both.

Comparing the two, if the voltage is not very high, it is recommended to use 100.

Board and debugging process

    Without further ado, let’s start with the pictures.

Since I don’t have any unsoldered samples, I can only take out the finished product to take a look.

Below are detailed pictures.

In the second detailed picture, the 4148 is connected to the chip pin. Because I burned the chip during the test, I blew it off with an air gun and accidentally pulled up the 4148. (I must remind everyone here: Never supply more than 13V to the chip. Although the manual says it can reach 20V, when I tested it, it burned once at 14V and once at 15V... .) And we are only supplying power, we don’t need such high voltage to power it. Generally, 12V is enough. When I tested, I always connected it to about 11V.

The third detailed picture, because when I was drawing the board, I thought that the inductor was too big, and I didn't have that much space to place it on the front, so I left it behind. The two external things are low-pass filters. The resistor is 2K, and the two together are 1K. Why not just use 1K, because I don't have it on hand. . . . The capacitance is 104, which is 0.1UF. The calculated cut-off frequency is 1.5KhZ, which is enough. If you find that you cannot get the correct waveform during the test, it may be that your low-pass filter is not done well. I drew the board at that time I didn't think about this problem when I was working on it, so I didn't draw it at that time (in fact, I don't have it now either)

In my picture the inductor is 500UH, but the inductance of the inductor I am connecting now is about 150UH. The larger the inductance, the larger the capacitance, and the resulting waveform will be more sinusoidal than sinusoidal. If the two inductors add up to 1MH, and the capacitance has 10Uf, the resulting waveform will be very good. (It goes without saying why I don’t use it. I don’t have it on hand.)

Procedures and testing!

My program is also a reference to other people's, so I won't show my shame.

I posted the boss’s post, you are so smart! One look at it for sure! ! !

https://blog.csdn.net/rfhklwt/article/details/76572803?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7Edefault-14.base&depth_1-utm_source=distribute.pc_relevant.none- task-blog-2%7Edefault%7EBlogCommendFromBaidu%7Edefault-14.base

Now that the board is ready and the program is there, let’s take a look at the results, shall we? ?

Both pictures are under no-load conditions, and the second oscilloscope has reached 10 levels.

It can be seen that they are all consistent with the input voltage * 0.707 situation, and the sine wave is also very beautiful (no load)