High power DC SSPC with capability of soft turn-on to large capacitive loads

摘要

Pre-charge circuitry (26) allows capacitive loads (24) connected to a solid state power controller (10) to be gradually charged up by a PWM, generated with a cycle by cycle current limit, switching a single MOSFET (28) in series with an inductor (30), before the SSPC (10) is turned on. The pre-charge circuitry (26) may require only three additional components, e.g., a MOSFET (28), an inductor (30) and a diode (34), along with a designated MOSFET gate driver (32).