I want to design a switching power supply with an input of 300V and an output of 30~400V.

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I want to design a switching power supply with an input of 300V and an output of 30~400V. [Copy link]

I am a novice, and I am currently working on a switching power supply with an input of 300V and an output of 30~400V. I have seen many diagrams online and checked many chip data, but I still can't make it. Later, I built a similar circuit in Multisim according to a circuit on the Internet, but I can't see any effective output. Here is the link to the circuit diagram: https://en.eeworld.com/bbs/forum.php?mod=viewthread&tid=470174 The circuit diagram is roughly as follows: Please help me, even if you can provide some ideas, I urgently need

maychang

Input 300V and output 30~400V, which requires the output voltage to be adjustable. The output may be higher or lower than the input, so the Buck circuit cannot be used (the output of the Buck circuit must be lower than the input), nor can the Boost circuit (the output of the Boost circuit must be higher than the input). If the output polarity reversal is allowed, the Buck-Boost circuit can be used. If the polarity reversal is not allowed, the Boost circuit can only be used to increase the voltage to 400V first, and then the Buck circuit can be used to reduce the voltage. A better way is to use a switching power supply circuit with a transformer, which can be used to increase or decrease the voltage at will.

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