Lps architecture for ups systems

A method for providing DC power with an UPS system comprising a transformer including a first primary winding configured to be coupled to a DC power source, a second primary winding configured to be coupled to an AC power source, and at least one secondary winding coupled to an output line, the method comprising:

• monitoring, with control logic coupled to the DC power source, voltage provided by the DC power source to the first primary winding;
• comparing, in response to monitoring, the voltage provided by the DC power source to a reference voltage;
• determining, in response to comparing, whether a level of the voltage provided by the DC power source is at least equal to the reference voltage;
• in response to determining that the level of the voltage provided by the DC power source is at least equal to the reference voltage, transmitting a signal to a first controller coupled to the first primary winding to enable the first controller, and transmitting a signal to a second controller coupled to the second primary winding to disable the second controller;
• and
• operating, in response to enabling the first controller, the first controller to control current from the DC power source through the first primary winding to induce a first current in the at least one secondary winding, the first current in the at least one secondary winding generating a first output voltage on the output line.

An Uninterruptible Power Supply (UPS), the UPS comprising:

• an input configured to be coupled to an AC mains supply;
• a converter coupled to the input;
• an inverter coupled to the converter with a DC bus;
• a DC power source coupled to the DC bus;
• a transformer coupled to the AC mains supply and the DC power source;
• and
• means for selecting one of the AC mains supply and the DC power source at a time to provide power to the transformer and for generating a plurality of desired DC voltages with the transformer based on the power received from the selected one of the AC mains supply and the DC power source.