Patent ID: 11955908
Assignee: APPLE INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 0:
1. A power converter configured to couple an energy storage device to an AC power system, the converter comprising:
a DC-DC converter comprising a first plurality of switching devices, the DC-DC converter being couplable to the energy storage device and coupled to an intermediate DC bus of the power converter, wherein the plurality of switching devices are operable to deliver energy from the energy storage device to the intermediate DC bus;
a DC-AC converter comprising a second plurality of switching devices, the DC-AC converter being coupled to the intermediate DC bus and couplable to the AC power system, wherein:
the second plurality of switching devices are operable to deliver energy from the intermediate DC bus to the AC power system;
the second plurality of switching devices comprises three legs, each of the three legs corresponding to the second plurality of switching devices having a first switch coupled between a high rail of the intermediate DC bus and an output terminal couplable to the AC power system and a second switch coupled between a low rail of the intermediate DC bus and an output terminal couplable to the AC power system; and

control circuitry that determines whether a connected AC power system is a single/split phase system or a three phase system and operates the first and second pluralities of switching devices accordingly, wherein:
if the control circuitry determines that the connected AC power system is a single/split phase system, the control circuitry provides drive signals to the second plurality of switching devices to operate a first leg to generate a first AC voltage, a second leg to generate a second AC voltage that is 180 degrees out of phase with respect to the first AC voltage, and a third leg to balance the first and second voltages.