Author Topic: 200Vac power supply on 230Vac  (Read 162 times)

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Offline ZeroResistance

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200Vac power supply on 230Vac
« on: December 10, 2017, 04:06:16 PM »
I recently purchase a Takasago SX020-100 DC power supply on ebay and the name plate mentions 200Vac (not sure what the frequency is), the mains power in my part of the world is 230V, 50Hz. I am planning to connect a transformer 230V / 12 V transformer in series with the mains input of the DC power supply in subtractive mode that is I will connect the 12 V secondary in series with the mains input of the power supply and then power up the 230V primary of the transformer that way I expect 230 - 12 = 218V to be present on the input of the dc power supply.
Even this seems to be beyond the rating of the japanese power supply so I thought why no wire up 2 transformer s in series so that makes it 230 - 24 = 206V.

Is this a right approach to reduce voltages or is there a better one? The DC power supply is rated at 0 to 20V, 100A, so that makes it a 2000W power supply. But initially I don't intent to use it at full power.
 

Offline Seekonk

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Re: 200Vac power supply on 230Vac
« Reply #1 on: December 10, 2017, 06:52:04 PM »
If you can pick it up, it is likely a switching power supply and it won't care. I would pop the top off and look at the voltage rating of the caps to see if the peak voltage of the mains is less than the capacitor rating with some margin.  I take it you didn't go with 24V because you have this one in your bin.
 

Offline ZeroResistance

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Re: 200Vac power supply on 230Vac
« Reply #2 on: December 10, 2017, 07:12:39 PM »
If you can pick it up, it is likely a switching power supply and it won't care. I would pop the top off and look at the voltage rating of the caps to see if the peak voltage of the mains is less than the capacitor rating with some margin.  I take it you didn't go with 24V because you have this one in your bin.

Yes its a swtching power supply and its in warranty. I contacted the seller and they said theey tested it upto 240Vac I hope they have not damaged the power supply. Yes I have some 12V, 20A trafos with me and now I intend to use 3 of them in seriese
 

Offline amyk

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Re: 200Vac power supply on 230Vac
« Reply #3 on: December 11, 2017, 04:22:44 AM »
The name sounds Japanese, and thus 200V makes sense since their usual mains is at 100V instead of the more common 115/117/120. You would have to look carefully at the input circuitry to make sure no components are too close to their ratings, but I have had no problems running Japanese 100V devices on 120V.
 

Offline ZeroResistance

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Re: 200Vac power supply on 230Vac
« Reply #4 on: December 11, 2017, 04:38:25 AM »
The name sounds Japanese, and thus 200V makes sense since their usual mains is at 100V instead of the more common 115/117/120. You would have to look carefully at the input circuitry to make sure no components are too close to their ratings, but I have had no problems running Japanese 100V devices on 120V.

Yes this is a Japanese power supply.
I have looked at the other models on their website and they have  few power supplies 100V ac rated and few 200V ac rated +/-10%, and even few more with a wide power supply range. So most likely this could be 200Vac +/-10%. Currently I have put 2 12V secondarys in series with the input and the voltmeter shows around 200Vac at the input of the power supply so for now I'm good to go, My only concern is the ebay guys have tested the power supply @ 240Vac hopefully its not damaged any components while doing so.
 


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