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Old 1st March 2013, 01:18 AM   #1
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Default regulating smps output

I have a 24-0v 20A meanwell smps. I need to regulate the output to 21-0v 20A. I can't find any regulator for this voltage, and anyway most of the regulators cant seem to handle this kind of current. The output voltage should not drop below 20v. How do I go about doing this.
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Old 1st March 2013, 03:10 AM   #2
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Quote:
Originally Posted by doors666 View Post
I have a 24-0v 20A meanwell smps. I need to regulate the output to 21-0v 20A. I can't find any regulator for this voltage, and anyway most of the regulators cant seem to handle this kind of current. The output voltage should not drop below 20v. How do I go about doing this.
What Meanwell model do you have?
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Old 1st March 2013, 04:16 AM   #3
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Originally Posted by J.Carlos View Post
What Meanwell model do you have?
Not sure, its at a friend's place. I will find out and update.
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Old 2nd March 2013, 12:53 PM   #4
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the smps is SDR-480-24
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Old 2nd March 2013, 01:12 PM   #5
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There are several ways that you might be able to do this.

1. If the SMPS uses a voltage divider and feeds back a sample of the output voltage to regulate its output, all you will need to do is modify the voltage divider.

2. You could use a few diodes in series with the output.

3. If the current draw is constant you could simply use a resistor.

4. You could use a simple zener with a transistor as a simple regulator.
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Old 2nd March 2013, 03:55 PM   #6
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Originally Posted by doors666 View Post
the smps is SDR-480-24
As you may be aware, the power supply has the option to adjust its output voltage, unfortunately in this model the adjustable range is 23.5 to 28.7 (from its test report):

Click the image to open in full size.

My advice is to contact their technical department in order to get first hand recommendations as to what can be modified in the supply to achieve your goal (if possible, to my understanding there is a chance, low and high line conditions are the main issues to deal with, regarding your needs). They have been really helpful all the times I had technical questions about their products.

Switching Power Supply - Mean Well Switching Power Supply Manufacturer


JC

Last edited by J.Carlos; 2nd March 2013 at 03:58 PM.
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Old 2nd March 2013, 03:57 PM   #7
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If the companies technical guys are happy to help, you wont get any better advice.
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Old 2nd March 2013, 04:03 PM   #8
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Quote:
Originally Posted by doors666 View Post
I have a 24-0v 20A meanwell smps. I need to regulate the output to 21-0v 20A. I can't find any regulator for this voltage, and anyway most of the regulators cant seem to handle this kind of current. The output voltage should not drop below 20v. How do I go about doing this.
What is the application, curious as to what 20A load would not tolerate 24V instead of 21?

Thanks
-Antonio
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Old 2nd March 2013, 04:25 PM   #9
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I agree. It must be a pretty poor circuit design that will only operate between 20 and 21V. At 20A you could see more variation from the wiring alone.
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Old 2nd March 2013, 07:05 PM   #10
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the chip i'm using cant handle more than 22v, the psu is fixed at 24v, hence the choice of 21v as the supply voltage to minimize power losses. modifying the smps is not really an option. so whats my best option here and it has to be cheap. how much regulation can i expect at these current levels, i can tweak the circuit accordingly. its not for an audio app.
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