Current sense resistors provide a low-latency, high-bandwidth method for overcurrent detection in battery management systems. By converting current directly into a proportional voltage (V = I × R), they enable immediate analog fault detection without relying on magnetic sensing or digital processing. In high-energy, low-impedance battery systems, fault currents can rise in nanoseconds—requiring sub‑microsecond protection to safeguard SiC and GaN power devices. This is typically implemented using a high-speed comparator that monitors the differential shunt voltage and drives a hardware shutdown path in the gate driver. With no ADC or firmware in the loop, protection response is limited primarily by analog propagation delay, enabling sub‑100 ns fault detection in modern designs.
Low-Latency Overcurrent Detection with Sense Resistors
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