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

Claim 10:
11. An energy storage system comprising:
a DC energy storage device;
a power converter comprising,
a first plurality of switching devices arranged in three legs, each leg having a high side switch and a low side switch, the first plurality of switching devices being coupled between the DC energy storage device and an intermediate DC bus of the power converter; and
a second plurality of switching devices arranged in three legs, each leg having a high side switch and a low side switch, the second plurality of switching devices being coupled between the intermediate DC bus and an AC power system; and

control circuitry that determines whether the 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 first plurality of switching devices to operate all three legs corresponding to the first plurality of switching devices in an interleaved manner to generate a DC bus voltage of the intermediate DC bus; and
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; or

if the control circuitry determines that the connected AC power system is a three phase system:
the control circuitry provides drive signals to the first plurality of switching devices to operate two of the legs corresponding to the first plurality of switching devices in an interleaved manner to generate the DC bus voltage of the intermediate DC bus; and
the control circuitry provides drive signals to the first plurality of switching devices to operate each leg to generate an AC voltage that is 120 degrees out of phase with respect to the AC voltage generated by the other two legs.