500w 220v power supply on 110v

[joeytvr]

#Aliexpress US $26.51 32%OFF | GHXAMP 500W Amplifier Switch Power Supply Dual DC 80V 24V 36V 48V 60V LLC Soft Switch Technology Replace Ring Cow Upgrade 1PCS
AliExpress

This is power supply recommended for amp board. However it's only available in 220. Thought maybe with pics some of you might see a way to convert it.

Thanks

 

[JonSnell Electronic]

Most quality switch mode power supplies are universal voltage; 85 ~ 265volt.
With no schematic it may be an issue to find a solution if it doesn't use a split level primary.
See primary stage attached. SW4 links for 110v use.

 

[FauxFrench]

Hi joeytvr,
Jon has already hinted a possibility if applicable.
I believe there could be another reason for the same converter not doing both 115Vac and 230Vac. It is a resonant type converter based on the LLC design. Power efficient and probably with zero voltage switching. If I'm not wrong, such converters are pretty dependent on the transformer winding ratio as their resonant nature and control principle using frequency variation near the resonance do not well allow for compensation of a very different input or output voltages.
You can most likely make a transformer for 115Vac (half the primary windings is my guess and adapt the resonance to a lower transformer inductance), but making other modifications will hardly do the job.
If you know a traditional push-pull converter, there you have a similar problem.
If you want an LLC type converter, you probably have to find one designed for 115Vac.

 

[Osvaldo de Banfield]

Most recent SMPSU's has PFC preregulator, and the autoswitching is inherent.

 

[FauxFrench]

Most recent SMPSU's has PFC preregulator, and the autoswitching is inherent.

Good point Osvaldo.
A PFC boost converter that generates an intermediate and more stable DC voltage from a largely varying input AC voltage.
With the input voltage range specified as 200V-240V AC, would you assume such a PFC pre-regulator to be present or something to be added to the present design?

 

[Osvaldo de Banfield]

Looking to the aliexpress pics, it hasn't PFC. You can try to add a voltage doubler prior to the PSU using two large diodes and two large caps, but be sure that you will be working with dangerous voltages. Isn't there a more suitable PSU?

 

[Kay Pirinha]

Look at Jon Snell's schematics and examine your PSU if there aren't yet two big electrolytics in series and a bridge rectifier. In this case you have all you need. Simply provide a jumper instead of the 110 Vac switch in the schematics.
Best regards!

 

[Osvaldo de Banfield]

As is depicted, it seem not logical to put two 180µF @ 450V (900V total) to be wired in series, to the rectified output of 350VDC from 240VAC.

 

[Kay Pirinha]

Yes, most probably you're right, OdB, assuming the brown 'lytics being those at the output !

Best regards!