PowerAnts

jonny0811 posted on 2017-1-16 17:51 Hello, moderator. I thought about it later. Actually, the question I asked before is like this: the formula of 2D*(N2/N1) can only provide one...

If the output rectifier does not have a filter inductor, it is directly an "electronic transformer" (output = input * turns ratio). As for your output not reaching or approaching the theoretical value, it may be a problem with the transformer model and component parameters. For example, if you use IN4148

maychang

jonny0811 posted on 2017-1-16 17:53 Hello, moderator, please help me look at my reply under the reply of the power moderator. Is my understanding in place this time? And the model that Saber imitated at the beginning...

The driving voltage is 10V, which should be enough. If an abnormal phenomenon is found in the actual circuit, the usual practice is to check it part by part from back to front or from front to back. For example, in your circuit, you can remove the load, the capacitor connected in parallel at the output end (no label, the unit of the 2000 marked is unknown) and the rectifier bridge one by one, and use an oscilloscope to check whether the secondary waveform of the transformer meets the design requirements. If it is still abnormal, you can even consider removing the transformer and using an oscilloscope to observe the midpoints of the left and right paths of the full bridge (you need to use dual channels and sum the two paths and invert one path). This way, you can gradually narrow the scope to find out where the problem lies. Your load resistor is marked with 0.0005. What unit is it? If it is ohms, isn't that too small?