Power monitoring system

The current sensing system using a CuNiSi busbar with temperature compensation addresses power loss and size issues in current measurement, ensuring accurate overcurrent detection and reduced heat generation in hybrid and electric vehicles.

DE102021214606B4Active Publication Date: 2026-05-21SCHAEFFLER TECHNOLOGIES AG & CO KG
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
SCHAEFFLER TECHNOLOGIES AG & CO KG
Filing Date
2021-12-17
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Existing current measurement systems in hybrid and electric vehicles suffer from high power loss and size constraints due to the use of shunt resistors, which generate heat and require low resistance values, while maintaining accuracy and safety in high-current applications.

Method used

A current sensing system utilizing a busbar made of copper alloy (Cu, Ni, Si) as a current-sensing element, combined with an isolated amplifier and a temperature compensation circuit to minimize power loss and temperature dependence, eliminating the need for separate shunt resistors and Hall sensors.

Benefits of technology

The system provides accurate overcurrent detection with minimal power loss and reduced size, achieving improved efficiency and safety by compensating for temperature variations without complex algorithms.

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Abstract

Power monitoring system (2) comprising the following: - a busbar (9) which is connected in a current path between a power supply (3) and a load (5), wherein a switch (7) is arranged in the current path and the busbar (9) comprises a temperature-dependent resistor with a specific temperature coefficient, - an amplifier (11) comprising a first input (A1) and a second input (A2) and an output (A3), wherein the first input (A1) and the second input (A2) are connected to the busbar (9) such that the amplifier (11) is designed to detect a voltage difference caused by a current in the current path at a section of the busbar (9), - a signal conditioning circuit (13) comprising a first terminal (S1) and a second terminal (S2) and a temperature compensation circuit, wherein the first terminal (S1) is connected to the output (A3) of the amplifier (11) and the temperature compensation circuit acts as a temperature-dependent resistor with a temperature coefficient having the opposite sign to the temperature coefficient of the resistance of the busbar (9), a comparator (15) with a first input (C1) and a second input (C2), wherein the first input (C1) of the comparator (15) is directly or indirectly connected to the second terminal (S2) of the signal conditioning circuit (13), and - a logic circuit arrangement (17), wherein the logic circuit arrangement (17) is designed to control a state of the switch (7) which is arranged in the current path, depending on an output signal of the comparator (15).
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