[Weekly Exercise] How to solve the series and parallel connection of switching power supplies?

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[Weekly Exercise] How to solve the series and parallel connection of switching power supplies? [Copy link]

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In the past few days, the question of netizen Zhang Xiaoge has been hotly discussed in the forum [ Can switching power supplies be directly connected in series? ]

Now the question is, we invite you to answer the question based on your own knowledge and experience in actual circuit design. To encourage you to participate in the reply, you will be rewarded with core points.

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Everyone is speaking enthusiastically, looking forward to your discussion~,,,,

According to my own experience in use, for example, in your laboratory, there are only two switching power supplies that can adjust a maximum of 30V, and you want to use a 48V DC voltage to debug the product. Do you have the urge to connect the two switching power supplies in series? Have you thought about it?

For example, your laboratory only has two small-power switching power supplies, and your experiment requires supplying DC power to a large load. Do you have the urge to connect these two switching power supplies in parallel? Can these two power supplies be connected in parallel? How do you plan to do it?

Question 1: [ Can switching power supplies be directly connected in series? ]

Question 2: [Can switching power supplies be used in series? Under what circumstances can they be used? ]

Question: 3: [Can switching power supplies be used in parallel? Under what circumstances can they be used? ]

Baidu netizens said: I have used switching power supplies in series, and the conclusion is whether switching power supplies can be used in series
[because each switching power supply output has a very complex control circuit, this circuit is "one-to-one tailor-made", when multiple power supplies are connected in series, the parameters of the entire circuit will change, and the circuit of a single power supply will not be able to adapt to the new parameter changes and will be damaged. I have done this before, and it burned out. Therefore, switching power supplies must not be used in series! Remember! ]

A Zhihu user said: [Can switching power supplies be connected in series? I have a 24V and a 5V switching power supply. Can they be connected in series to use as a 29V power supply? Because I have a device that needs 30V (±10%) power supply. So I want to connect them in series for emergency use. According to the vague physical knowledge I remember, two DC power supplies (such as batteries) can be connected in series, but I don’t know if this AC-to-DC switching power supply can be connected in series? If so, what conditions are required? ]

Zhihu big guy 1 answer:

Zhihu big guy 2 answers:

In our [World Forum of Electronic Engineering], there are often netizens asking questions about this aspect. Can you go and have a look~~~~~

[ Can the switching power supply module be used in this way ?]

[ What are your opinions on the parallel use of switching power supplies?】

【Switching power supply series connection】

[ Can dual 12V power supplies be used in parallel? ]

[ Hee, let's show you our parallel connection of switching power supply modules ]