CPC H02J 9/062 (2013.01) [H02J 9/061 (2013.01)] | 20 Claims |
1. An uninterruptible power supply (UPS) system including:
a first input configured to be coupled to an AC input power source and configured to receive AC input power having a positive cycle and a negative cycle from the AC input power source;
a second input configured to be coupled to an energy storage device;
an output configured to provide output power;
a power conversion circuit configured to convert power received from at least one of the AC input power source or the energy storage device, the power conversion circuit including
a primary branch portion having a first primary branch path including a first inductor and a second primary branch path coupled in parallel with the first primary branch path, and
a backup branch portion having a second inductor, the second inductor being magnetically coupled to, and galvanically isolated from, the first inductor;
an output circuit coupled to the power conversion circuit and to the output; and
at least one controller coupled to the power conversion circuit and to the output circuit, and configured to control the power conversion circuit to
provide, in a normal mode of operation and during the positive cycle of the AC input power, a first current derived from the AC input power source to the output circuit through the first inductor and not through the second primary branch path, wherein the first current through the first inductor induces a first induced voltage across the second inductor,
discharge, by the second inductor in the normal mode of operation, a second current derived from the first induced voltage to the energy storage device,
draw, in a backup mode of operation, a third current from the energy storage device through the second inductor, wherein the third current through the second inductor induces a second induced voltage across the first inductor, and
discharge, by the first inductor, a fourth current derived from the second induced voltage to the output circuit.
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