Busbar for measuring a direct and/or alternating current
AssigneeSMA Solar Technology AG
InventorFelix Mühlhausen
Life of this patent
Estimating the term…
Abstract
A busbar for measuring a direct and/or alternating current has connection regions and at least one resistance region arranged between the connection regions, and two measuring contacts arranged in the resistance region. The busbar has a geometry in which the measuring contacts are currentless during operation of the busbar. The busbar is formed in one piece. An apparatus for determining current and having such a busbar and a power converter having such an apparatus are also disclosed.
Claims17
A busbar comprising connection regions and at least one resistance region arranged between the connection regions for measuring a direct and/or alternating current with current intensities greater than 100 amperes, and comprising two measuring contacts which are arranged in the resistance region, wherein the measuring contacts are arranged on respective measuring point plateaus which are connected to a current-carrying region of the resistance region via respective connecting cross pieces that run transversely to a longitudinal center axis of the busbar, wherein recesses are arranged on both sides of the measuring point plateaus along the longitudinal center axis such that the measuring point plateaus are currentless during operation of the busbar, wherein the busbar is formed in one piece and made of a single material.
A power converter comprising current-carrying lines for conducting the direct and/or alternating currents processed by the power converter, wherein the power converter comprises a multi-channel apparatus for determining current having a multi-channel busbar comprising on a first side, at least two individual connection regions for connecting a plurality of the current-carrying lines and, on a second side, a common busbar as a common connection region, wherein resistance regions are arranged between the respective individual connection region and the common busbar for measuring direct and/or alternating currents with current intensities greater than 100 amperes, further comprising two measuring contacts arranged in each respective resistance region, wherein the multi-channel busbar has a geometry in which regions of the measuring contacts are currentless during operation of the power converter, the multi-channel apparatus further comprising a printed circuit board arranged in a plane-parallel manner with respect to the busbar for measured value acquisition, wherein the measured value acquisition comprises an acquisition of a voltage difference between the two measuring contacts of a respective resistance region, wherein the multi-channel apparatus bridges respective interruptions of the current-carrying lines, wherein the power converter is designed to determine, using the voltage differences detected by means of the measuring contacts along the respective resistance regions of the busbar, currents flowing through the current-carrying lines during operation of the power converter, wherein the power converter is configured to have a nominal power that is greater than 10 kW.
Dependencies are inferred from the claim text.