PV bypass diode failures appear as string underperformance or a damaged junction box, and the evidence chain runs from the shading pattern to the junction-box temperature. This guide covers the failure mechanisms, the hot-spot damage patterns, the thermal evidence, and the module-versus-device attribution. Why Bypass Diodes Fail in the Field The bypass diode conducts the … Read more
A PV bypass diode is selected by five numbers—forward current, forward drop, leakage at temperature, surge capability, and thermal resistance—and the selection only works when those numbers are checked inside the real junction-box heat-flow route. The part that looks best at 25 °C often fails the hot, shaded-hour test. This guide walks through the selection … Read more
Protection diodes can clamp a transient, block unwanted current or provide a path for an inductive load when a switch turns off. Those are different jobs. A TVS across a supply does not automatically provide series reverse-polarity isolation, and a relay flyback diode is not a universal surge protector. Start with the event and current … Read more
A high voltage MOSFET must block the voltage at its own terminals, including switching excursions, while meeting the converter’s loss and thermal limits. A large drain–source rating alone cannot establish suitability. The design also depends on gate drive, reverse-current behavior, operating mode and the physical current loops. Reading those conditions together is more useful than … Read more
Every generation of electronics leaves a layer behind, and those layers are still on the board. The adapter on your desk contains the descendants of parts invented to make radio work, and the fuse-box logic of a modern car traces back to the same idea: change the voltage, protect what comes after. Understanding that lineage … Read more
Transistors are semiconductor devices that control current and can provide switching or amplification. In signal circuits they shape, amplify or buffer an electrical signal. In power circuits they control energy delivered to a load. Choosing a transistor starts with its job in the circuit, then its voltage, current, drive, bandwidth and thermal requirements. Last updated: … Read more
A power MOSFET is a transistor used to switch or control electrical power with a gate voltage. In a switching power supply it helps convert energy efficiently; in a photovoltaic inverter it helps synthesize AC from a DC source; in automotive electronics it can switch loads or protect a supply path. Selecting one requires the … Read more
A power rectifier converts alternating current into current that flows in one direction, using diodes or controlled semiconductor switches. Its basic output is pulsating DC. Filtering reduces the ripple, while a regulator or controlled converter may be needed to maintain a specified voltage. Rectification alone does not produce perfectly smooth, regulated power. Last updated: October … Read more
Every power design starts with a loss number, and most loss numbers are wrong in the same way: they count the obvious term and miss the one that grows with frequency. A diode in a power circuit loses power in three distinct ways — conduction, switching, and recovery — and each term maps to a … Read more
Derating is not pessimism; it is a budget. The datasheet ratings of a power diode describe a clean, controlled test at 25 C — and the real world adds temperature, transients, lot variation, and duty that the test never included. The derating rules set aside the margin that buys the design against those unknowns. This … Read more
The power semiconductor market in 2026 assembles itself around three demand centers — electric vehicles, solar and storage, and AI data-center compute — and the interesting news is not which of the three grew, but that they now pull on the same component families at the same time. A SiC diode can serve a solar … Read more
Size a bridge rectifier from a DC motor’s nameplate and you will be wrong in the safe direction almost every time — the rectifier will be too big, cost too much, and waste space. Size it from the nameplate and your design will occasionally be catastrophically wrong, because the nameplate current is the running current, … Read more
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