Using MEAN WELL Power Supplies in Parallel

6 September 2021
using_mean_well_power_supplies_in_parallel

One question that we are often asked is if a MEAN WELL power supply can be used in parallel. Particularly when it comes to using the HLG series LED driver in LED lighting applications. 

MEAN WELL HLG-150H Series LED Driver
MEAN WELL HLG-150H Series LED Driver

 

A power supply needs to have built-in circuitry, which will allow it to be used in parallel with another power supply. MEAN WELL refers to this circuitry as a ‘current sharing’ function.

A number of MEAN WELL’s enclosed power supplies and DIN rail power supplies have a current sharing function, including the following power supplies:

DIN Rail

Enclosed

SDR-480

RSP-1000

SDR-960

RSP-1500

TDR-960

RSP-1600

 

RSP-2000

 

RSP-2400

 

RSP-3000

 

RST-5000

 

RST-10000

MEAN WELL SDR-960 DIN Rail Power Supply

 

MEAN WELL RSP-3000 Power Supply
MEAN WELL RSP-3000 Enclosed Power Supply

 

However, none of the MEAN WELL LED drivers do. This means you cannot use the HLG series LED driver in parallel, you will need to split the load.

There is a general belief that you can connect any two power supplies in parallel if you use two diodes to isolate the power supplies.

This is false.

Using diodes to isolate the supplies actually gives them redundancy. In other words, if one supply fails, the other one will take over the load. It will not allow them to share the load.

If you have any questions regarding using MEAN WELL power supplies in parallel, please do not hesitate to contact MEAN WELL Australia.