Power inverter with multi-fed on-board power supply for supplying a controller

摘要

An inverter includes a DC/AC converter connectable to a DC power grid, at least one DC/DC converter arranged upstream of the DC/AC converter and providing a galvanic isolation, and a DC voltage link at the input of the at least one DC/DC converter and connectable to at least one DC power source. The inverter also includes at least one further DC voltage link which is galvanically isolated from the first DC voltage link by the DC/DC converter, on-board voltage rails supplying a controller and other auxiliary devices of the inverter with electric energy; and an on-board supply unit. The on-board supply unit is configured and adapted to feed the electric energy into the on-board voltage rails both out of the first DC voltage link and out of the at least one further DC voltage link.

主权项

1. A power inverter for feeding electric energy from at least one DC power source into an AC power grid, the inverter comprising:
a DC/AC converter configured and adapted to be connected to the AC power grid; at least one DC/DC converter arranged upstream of the DC/AC converter and configured to provide a galvanic isolation between its input and output; a first DC voltage link arranged at the input of the at least one DC/DC converter, and configured and adapted to be connected to the at least one DC power source; at least one further DC voltage link arranged between the DC/DC converter and the DC/AC converter, and which is galvanically isolated from the first DC voltage link by the DC/DC converter; a controller configured to provide control signals to the DC/AC converter and the at least one DC/DC converter; on-board voltage rails configured and adapted to supply the controller with electric energy; and an on-board supply unit configured and adapted to feed the electric energy into the on-board voltage rails; wherein the on-board supply unit is configured and adapted to feed the electric energy both out of the first DC voltage link and out of the at least one further DC voltage link, wherein a capacitance of the first DC voltage link is smaller than a capacitance of the at least one further DC voltage link, and wherein the on-board supply unit comprises a transformer which comprises two primary windings electrically isolated with regard to each other, wherein one of the primary windings is fed with current out of the first DC voltage link and the other of the primary windings is fed with current out of the at least one further DC voltage link.