Patent ID: 9065345
Filing Date: 2015-06-23
Classification: H02M,Y02B,Y02E

Abstract:
1. A transformerless inverter configured to feed electric energy from a DC current source into an AC power grid, the inverter comprising an inverter bridge configured to receive an intermediate link DC voltage and generate an output AC voltage at an output thereof, and a DC/DC converter connected upstream of the inverter bridge, wherein the DC/DC converter is configured to receive an input DC voltage present between two input lines of the inverter and convert the input DC voltage into the intermediate link DC voltage, and present the intermediate link DC voltage between two input lines of the inverter bridge; and at least one capacitance connected between the two input lines of the inverter bridge, thus providing an intermediate voltage link; the DC/DC converter comprising at least one resonant circuit that comprises a resonance inductance and a resonance capacitance, wherein the resonant circuit at its input is selectively connected from among one of the two input lines of the inverter and an intermediate potential line at which a potential between the input lines of the inverter is present, based on a position or a state of at least two pulsed switches, and wherein the input lines of the inverter and the input lines of the inverter bridge are galvanically separated from one another in a capacitive way, wherein the resonant circuit is undivided, and wherein the resonant circuit, at its output, is connected to the two input lines of the inverter bridge.