Patent ID: 8456128
Filing Date: 2013-06-04
Classification: H02J,H02M,H02P

Abstract:
1. A DC to AC inverter comprising: two or more DC to AC converters that provide a plurality of output channels, a DC input for coupling to a long term DC energy store, and at least one mains frequency phase controller or a phase controller input for coupling to at least one phase controller, wherein: the inverter draws a DC input current from the long term DC energy store coupled to the DC input and generates AC output voltages on the output channels that have a frequency and amplitude for supplying a single phase mains powered apparatus, and the at least one phase controller dynamically controls the phase of the AC output voltages independently by: receiving input indicating the magnitude and phase of the AC component of current supplied to or drawn from the output channels, and altering the phase of the AC output voltage or voltages on one or more output channels of the DC to AC inverter based on the indicated magnitude and phase of the AC component of current supplied to or drawn from one or more of the output channels to reduce mains frequency ripple current drawn from the long term DC energy store coupled to the DC input.