PMOS based pre-charging and voltage soft start circuit using LTspice simulations for hardware implementation

Requirement:

I have to charge a bulky DC link capacitor (3000 µF, 400V) of a photovoltaic (PV) inverter which will be powered using an electronic PV emulator for my research thesis. I am trying to limit the inrush current and ramp up the voltage in a soft-start manner by using a pre-charging circuit centred around a PMOS-FET.

Background and initial attempts:

I am following this application note by onsemi. A plethora of questions already exist on electronics.stackexchange.com related to pre-charging circuits such as this, this, this, this, this, this etc. (the list is long!) that have solved the problem of limiting inrush current and ensuring soft-start of the circuit.

In fact, I too have posted a question there, and I attempted to answer my own question.

Simulation Data:

Circuit Schematic using PMOS Simulation Output using PMOS Circuit Schematic using NMOS Simulation Output using NMOS

Question(s): I would appreciate an in-depth evaluation from the community towards my approach. Have I implemented the concept correctly? Can I go ahead and build a hardware using my schematic? Will my components heat-up? From a designer's perspective the list of questions could be endless. All I am looking for is a brutally honest criticism so that I do not fail in my hardware.

Note: All the components are from the default in-built library of LTspice.

posted 2 months ago

CC BY-SA 4.0

2mo ago

ankit.kumar‭

6 reputation 1 0 1 2