For the PDF version of this article, click here.. Protecting power transistors against overcurrent failure has always been a challenging issue in power circuit design.

To size the branch-circuit protection for a motor, refer to 240.6(A), 430.52(C), and Table 430.150. If you're using motor controls, size and protect the motor control circuit conductors per 430.72. If ...

Understanding the overcurrent trilogy will help you protect your circuits. Circuit overcurrent protection encompasses overload, short-circuit, and ground-fault protection. NEC Art. 100 defines ...

This circuit provides latching and high-speed overcurrent protection for power-factor corrected (PFC) boost converters operating at dc voltages to 380 V.

A typical circuit would use the base-emitter threshold voltage of approximately 0.6V of a bipolar transistor to trigger the power-supply-protection circuits. Although economical, the transistor’s ...

The test circuit then produces the following results: Using a TL431CLP for D 2, the circuit trips at 17.94V, and, using a ZR431CL for D 2, the trip level is 18.01V. Depending on Q 2 ’s base-emitter ...