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AssigneeVolkswagen Aktiengesellschaft
InventorsRüdiger Kusch, Hendrik Schröder
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The invention relates to a device for converting voltage comprising a converter and a controller, wherein the converter has three half bridges, each with four transistors, and at least one half bridge has two switching elements, wherein by means of a first switching element, a central tap between two diodes is connected in a first switched position to a neutral point of a DC link capacitor and, in a second switched position, to a positive charging connection for an external DC voltage source, and by means of a second switching element, a central tap of the half bridge is connected in a first switched position to a pole of an AC voltage connection, and in a second switched position to a negative pole of a DC voltage connection. Moreover, the invention relates to a traction network as well as a method for charging a battery of a traction network by means of an external DC voltage source.
A device for converting voltage comprising a converter and a controller, wherein the converter has a two-pole DC voltage connection for connecting a battery and a three-pole AC voltage connection for connecting an electric machine, wherein the converter has three half bridges wherein two transistors with freewheeling diodes are arranged in the upper part as well as in the lower part of each half bridge, wherein central taps of the half bridges are connectable to the AC voltage connection and a DC link capacitor is arranged parallel to the DC voltage connection and consists of at least two series-connected capacitors, wherein the common connecting point forms a neutral point, wherein the half bridges are assigned two diodes, wherein the two diodes are series-connected and connect central taps of the upper part and the lower part of the half bridges, wherein at least one half bridge is assigned two switching elements, wherein the first switching element, when in a first switched position, connects a central tap between the two diodes to the neutral point and, when in a second switched position, connects the central tap between the two diodes to a positive charging connection for an external DC voltage source, wherein the second switching element, when in a first switched position, connects the central tap of the half bridge to a pole of the AC voltage connection and, when in a second switched position, connects the central tap of the half bridge to the negative pole of the DC voltage connection, wherein the controller is designed to control the switching elements from the first switched position to the second switched position depending on an intended external charging process.
Dependencies are inferred from the claim text.