Novel high efficiency line interactive ups

A method of operating a load-conditioning system comprising a load output configured to be coupled to a load, a power-factor-correction circuit (PFC) comprising a first switching leg and a second switching leg, an inverter comprising the second switching leg and a third switching leg, and a capacitor coupled to an inverter output of the inverter and being coupled in series with the load output, the method comprising:

• controlling the first switching leg and the second switching leg based on a first modulation index;
• controlling the third switching leg based on a second modulation index;
• and
• providing, by the inverter, an output AC voltage to the capacitor based on the first modulation index and the second modulation index.

A non-transitory computer-readable medium storing thereon sequences of computer-executable instructions for operating a load-conditioning system comprising a load output configured to be coupled to a load, a power-factor-correction circuit (PFC) comprising a first switching leg and a second switching leg, an inverter comprising the second switching leg and a third switching leg, and a capacitor coupled to an inverter output of the inverter and being coupled in series with the load output, the sequences of computer-executable instructions including instructions that instruct at least one processor to:

• control the first switching leg and the second switching leg based on a first modulation index;
• control the third switching leg based on a second modulation index;
• and
• provide, by the inverter, an output AC voltage to the capacitor based on the first modulation index and the second modulation index.

A power-conditioning system comprising:

• a load output configured to be coupled to a load;
• a power-factor-correction circuit (PFC) comprising a first switching leg and a second switching leg, wherein the first switching leg and the second switching leg are configured to be controlled based on a first switching frequency;
• an inverter comprising the second switching leg and a third switching leg, wherein the third switching leg is configured to be controlled based on a second switching frequency;
• and
• a capacitor coupled to an inverter output of the inverter and being coupled in series with the load output.