Patent ID: 9077262
Filing Date: 2015-07-07
Classification: H02J,H02M,Y02E

Abstract:
1. A power converter for providing an AC power output from a photovoltaic power source, the power converter comprising: a capacitive storage element; an inverter circuit having an input coupled to the capacitive storage element and an output providing the AC power output at a line frequency, wherein the inverter circuit draws charge from the capacitive storage element cyclically at half-periods of the line frequency and thereby causes a ripple variation in a voltage across the capacitive storage element; and a DC-DC converter having an input coupled to an output of the photovoltaic power source, and an output coupled across the capacitive storage element, wherein a conversion ratio of the DC-DC converter is varied by controlling a switching circuit of the DC-DC converter such that the output of the photovoltaic power source is maintained at a substantially constant voltage, and wherein the conversion ratio of the DC-DC converter varies at the half-periods of the line frequency as the output of the DC-DC converter follows the ripple variation in the voltage across the capacitive storage element.