Scheme of SMPS 3kW 310V?

A

Alexander Fadeev2012-04-04 06:05:48

Do it yourself

Alexander Fadeev, 2012-04-04 06:05:48

Hi everybody.
Please tell me a reliable and well-thought-out power supply circuit up to 3kW / 310V, preferably transformerless. The input is a regular network 220V 50Hz. An inverter and an induction furnace are planned as a load.
I understand perfectly well that the task is serious. =) There are a lot of different schemes on the Internet, I really can’t choose.
- Galvanic isolation on the optocoupler.
- At the input there is a high-frequency filter that prevents interference from entering the network.
- Stabilization of the output voltage.
- Power factor corrector
- Microprocessor control
- Output voltage adjustment from 0 to 310V.
— Control electronics on a separate power supply
In general, you really need something like this in terms of functionality, only with the specified output characteristics: www.soel.ru/cms/f/?/380058.pdf
Thanks in advance for any help!
PS: I stuffed it into electronics for beginners, since I stupidly did not find other electronics. =)

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2 answer(s)

B

Boris Syomov, 2012-04-05
@kotomyava

How do you imagine a 3KW transformerless SMPS?
Adjusting the output voltage from 310 to 0V? You will not find such a scheme, all the more proven and reliable - firstly, the task is very difficult, and secondly, it is not typical at all.

A

Alexlexandr, 2014-06-14
@Alexlexandr

I understand that you need a constant voltage of 310 V?
So the same is done in an elementary way, at least for 3 kW, at least for 30 kW :)
310 V is the value of the usual single-phase voltage of 220V rectified and smoothed by a capacitor.
Those. to get such an IP, you only need 5 simple details.
4 diodes, assemble a rectifier bridge, and 1n electrolytic capacitor at its output, smooth out ripples.
You will need a capacitor for a voltage of 400V, and with a capacity of approximately 200 microfarads. You can collect several in parallel. In series with the capacitor, I advise you to solder a 2 W resistor with a resistance of 100 ... 470 kOhm, which would discharge it after the network is turned off. It's safer that way.
Take diodes for a voltage of at least 1000 V, and for a current of about 20A.
Moreover, there are ready-made bridges for 1000 V and a current of 20 .. 30 Amperes, for example.
Nothing else is needed.
PS Calculation of voltage at the rectifier: 220V* 1.4=308V