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Generally a psu with adjustable output will be costly. So if you need a fixed voltage, better go for fixed smps. As e-bay has quoted below 20 bucks, there is no need to pay more than 25$. i got the info only on net and never I used the device.Hi Sarma,
I live in Singapore. I had some experience with China made switching power supply, which cost about S$100, US$77. It say adjustable 0 to 24Vdc and 10Amp. In reality, adjustable to 16Vdc and 4.5Amp.
Thank you for following this thread closely. Just want to be assured, did you know of anyone who had use this brand. Please let me know their experience.
Meanwhile, Hero base on the attached Planar information appreciate any circuit and IC recommendation.
My Idea Is To First Use A Hi Voltage Preregulator For 180v To Insure That The Power Will Not Go Away When It Dips And Bounce. Then Use Low Voltages Pwm To Get The Current
even drawing 500W from 220VAC is only about 2.25A so a 5A bridge would be fine.Perhaps your concept is right, if you source the L4970A, perhaps you can complete it. You may have to use a high power bridge rated 20 amps to safely deliver 8 amps.
Please see this pdf
https://www.electro-tech-online.com/custompdfs/2008/05/powsupply-1.pdf
My suggestion was with specific reference to L4970A chip and the schematic there on provided by the OP. There after the OP wanted to use Planar transformers-- i was confused with low height CRGO core transformers --some of them I saw in light dimmers( Really sleek and wide.)even drawing 500W from 220VAC is only about 2.25A so a 5A bridge would be fine.
even drawing 500W from 220VAC is only about 2.25A so a 5A bridge would be fine.
https://www.electro-tech-online.com/custompdfs/2008/05/s5a.pdfIf the resistance of the mains is about 0.5hm: and the peak voltage is 325V, the peak current would be 650A so you think your rectifier would be toast? Suppose your capacitor is 1000:mu:F, then the surge would decay rapidly to within 63% within 500:mu:s so the capacitor will be as good as fully charged within 5ms.
So as we've established a 25A rectifier will be fine but what about the 5A rectifier you initially suggested? Somehow I think it'll be toast.
I think it is ok to assume that input current to a DC to DC converter (having 40Vdc input and output 13Vdc 10Amp) is less than 0.5Amp.
Appreciate comments, yes?![]()