CPC H02J 9/061 (2013.01) [H02J 1/108 (2013.01); H02M 3/158 (2013.01)] | 20 Claims |
1. An uninterruptible power supply, comprising:
a first input configured to receive input power;
a backup input configured to receive backup power from a backup power source;
an output configured to provide output power to a load derived from at least one of the input power or the backup power;
a bypass switch having a first connection coupled to the first input and a second connection coupled to the output; and
a controller coupled to the bypass switch and configured to:
determine a voltage difference across the bypass switch;
compare, based on the voltage difference across the bypass switch, input harmonics of a first voltage at the first connection of the bypass switch with output harmonics of a second voltage at the second connection of the bypass switch; and
output an indication of a failure of the bypass switch based on the comparing of the input harmonics and the output harmonics.
|