Every automotive engineer has heard of load dump, and most have heard only one number: 87 V. Fewer can explain why the rail spikes that high, why the spike has an energy and not just a voltage, and what actually survives it. Load dump is not a single clean pulse; it is the consequence of … Read more
An electric vehicle is not one power stage; it is a map of them. A traction inverter, a DC-DC converter, an on-board charger, a set of auxiliary loads — each stage runs at a different voltage, frequency, and duty, and each has a device chemistry that fits it best. The recurring question “MOSFET or IGBT?” … Read more
Two diodes protect a solar array, and they share names that sound interchangeable. The bypass diode protects the module from shading; the blocking diode protects the battery and the string from reverse current. The placement gives them away: the bypass diode sits in parallel with a substring inside the module, and the blocking diode sits … Read more
A PV bypass diode is selected at room temperature and lives at 100 °C — and that gap is where most selection errors hide. The junction box of a solar module runs hot by design, often 90–110 °C in full sun, and every figure on the datasheet — forward drop, leakage, surge — was measured … Read more
A solar module contains a protection diode you never see and rarely think about — until a shaded cell or a cracked cell makes the whole string underperform. The bypass diode sits inside the junction box, wired in parallel with a group of cells, and its job is to carry the string current around a … Read more
An H-bridge drive for a motor has two hidden electrical paths: the switching path that everyone sizes, and the freewheeling path that nobody does. When the H-bridge releases a motor, the back-EMF drives current through the Zener or the protection diodes that absorb the stored energy — and that reverse path, repeated thousands of times, … Read more
The Zener’s reputation as a “voltage reference” suggests it holds its voltage like a calibration standard, and the honest answer is that it does not — a Zener holds its voltage within a tolerance, it drifts with temperature, and the sign of that drift changes around 4 V. For many circuits the Zener reference is … Read more
The protection aisle is full of parts that clamp voltage, and the names — Zener, avalanche, TVS — are used so loosely that a beginner cannot tell what a given part will actually do. The honest distinction is not marketing but physics: a Zener clamps precisely and slowly, an avalanche rectifier clamps ruggedly when pushed … Read more
A Zener diode is the component that looks like a normal diode and behaves like a voltage gate in reverse. Every diode blocks reverse voltage until a limit; a Zener is engineered to break down cleanly at a specific voltage and hold that voltage across a range of current. The number printed on it — … Read more
The selling point of silicon carbide is that it runs hot — a 175 °C or 200 °C junction is inside the SiC envelope where silicon gives up. But running hot changes the reliability question, not the answer: a hotter junction cycles harder, the packaging wears out faster, and the qualification evidence a buyer needs … Read more