Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Electronic DC Fuse - Simple Two Transistor Circuit - Electronic Fuses eliminate fuse replacement and current-limit short-circuit power dissipation
An electronic fuse eliminates fuse replacement in case of an overload and does not dissipate any power under short-circuit conditions as a current-limiter circuit would.
Shown below is a two transistor (one PNP BJT and one P-MOSFET) version of a DC, high-side electronic fuse for positive voltages.
Reversing the transistor polarities to NPN and N-MOSFET would give a high-side fuse for negative voltages.
Q1 monitors the voltage across the shunt resistor R1. When the current increases so that...
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