Patent ID: 8654550

Claim:
A redundant AC-DC power supply system comprising: a first AC-DC power converter that is configured to generate a first DC output; a second AC-DC power converter that is configured to generate a second DC output; an output circuit having first and second inputs, said output circuit being configured to provide an output voltage based on power received at said first and second inputs; and a controller configured to control: whether the first AC-DC power converter is active in that it provides the first DC output to the first input of the output circuit or is idle in that it does not provide the first DC output to the first input of the output circuit, and whether the second AC-DC power converter is active in that it provides the second DC output to the second input of the output circuit or is idle in that it does not provide the second DC output to the second input of the output circuit, the controller being configured to detect a circulating current condition in at least one idle converter of first and second AC-DC power converters.