Abstract
This article deals with the design of an electronic fuse for 380 V dc distribution systems. It has been devised for applications that require current limitation up to 3 A, so approximately 1.2 kW. To protect the main semiconductor against excessive energy dissipation, the tripping time, defined as the time that circuit operates in current-limitation mode, varies with the current fault magnitude, and eventually for very hard fault conditions, i.e., short-circuit, the circuit acts as a circuit-breaker avoiding current-limitation operation. Furthermore, thermal foldback characteristic, defined as the variation of current limitation setpoint with temperature, and tripping time variation with temperature are also considered. Mathematical analysis, circuit design, simulations, and experimental validation have been carried out using a SiC <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">MOSFET</small> as power semiconductor. Experimental results working under different conditions show an excellent performance.
Highlights
THE use of DC bus distribution systems has been dominant in several applications like aerospace [1], telecommunication systems or data centers [2], among others
One of the novelties of this work compared with other protections is that tripping time, where the load current is limited by a MOSFET operating in linear region, is automatically adjusted depending on load fault severity, in a simple way without requiring digital processors and neither voltage sensors
A 380VDC electronic fuse with self-adjusting tripping time depending on the overcurrent magnitude and temperature foldback compensation has been proposed in this work
Summary
THE use of DC bus distribution systems has been dominant in several applications like aerospace [1] , telecommunication systems or data centers [2], among others. One of the novelties of this work compared with other protections is that tripping time, where the load current is limited by a MOSFET operating in linear region (unlike circuit breakers), is automatically adjusted depending on load fault severity, in a simple way without requiring digital processors and neither voltage sensors. This feature enhances load protection, performs like a traditional fuse following an I2t curve, but much faster, and it limits the power dissipation in the semiconductor. Since overcurrent is measured during the reaction time, the higher the overcurrent value, the lower the tripping time and vice versa
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