Four-terminal current-sensing shunt resistor assembly

Abstract

The present invention relates to a four-terminal current measuring shunt resistor assembly comprising a shunt resistor section, a sense loop, and a PCB section, wherein the shunt resistor section comprises two low-resistance sections connected by a high-resistance section, and wherein the PCB section connects the two low-resistance sections via two contact points.

Claims

[1] A four-terminal current-sensing shunt resistor assembly comprising: a shunt resistor section (10), a detection loop (3, b, a, 2, d, c, 3) and a PCB section (13), wherein the shunt resistor section (10) comprises two low-resistance sections (11) connected by a high-resistance section (12), and wherein the PCB section (13) connects the two low-resistance sections (11) to one another via two contact points (1, 2). [2] A four-terminal current measuring shunt resistor assembly according to claim 1, characterized by that the low-resistance sections (11) consist of copper and / or that the high-resistance section (12) consists of manganin, ie an alloy comprising 84.2% ± 2.0% copper, 12.1% ± 2.0% manganese and 3.7% ± 2.0% nickel. [3] A four-terminal current measuring shunt resistor assembly according to any one of the preceding claims, characterized by that the detection loop (3, b, a, 2, d, c, 3) is arranged symmetrically. [4] A four-terminal current measuring shunt resistor assembly according to any one of the preceding claims, characterized by that the PCB section (13) is mounted via contact points (1, 2) in the middle of the shunt resistor section (10), preferably directly on the shunt resistor section (10) and / or that conductors are guided over the shunt resistor section (10) at a distance from its edge which corresponds to 20% ± 5% of the width of the shunt resistor section (10). [5] A four-terminal current measuring shunt resistor assembly according to any one of the preceding claims, characterized bythat the PCB section (13) comprises the detection loop (3, b, a, 2, d, c, 3), a high frequency compensation network, a delta-sigma AD converter, a current measuring circuitry, an IGBT driver and / or a drive. [6] A four-terminal current shunt resistor assembly according to any one of the preceding claims, characterized by that the shunt resistance section (10) comprises a self-inductive section (Ls) connected in series with a resistive shunt section (Rs). [7] Four-terminal current shunt resistor assembly according to at least claims 5 and 6, characterized by that the shunt resistance section (10) comprises an inductive voltage detection section (Lse) connected in series with the high-frequency compensation network. [8] A four-terminal current shunt resistor assembly according to claim 7, characterized bythat the high frequency compensation network includes an RC filter (Rc, Cc) for blocking certain output frequencies. [9] A four-terminal current measuring shunt resistor assembly according to any one of the preceding claims, characterized by that the shunt resistor section (10) is substantially rectangular, with its outer edges preferably being continuous and straight. [10] A four-terminal current measuring shunt resistor assembly according to any one of the preceding claims, characterized by that one of the contact points (1) is aligned with the detection loop (3, b, a, 2, d, c, 3).

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