Electrical & Electronics Engineering in Bangalore

A 250W single-phase grid-tied inverter for rooftop PV panels, implementing MPPT via the incremental conductance algorithm and synchronising to the grid using a PLL. The design uses an H-bridge IGBT stage with LCL filter, achieving 94% efficiency at rated load and THD below 5% — meeting IEEE 1547 requirements.

A closed-loop BLDC motor drive using a three-phase MOSFET inverter, Hall-effect sensor feedback and a PID controller implemented on a dsPIC33. The system maintains set-point speed within ±2 RPM from no-load to full rated load, with a PC interface for real-time tuning of PID gains and response plotting.

A 7S Li-ion BMS managing a 25.9V, 20Ah pack with cell-level voltage and temperature monitoring, passive balancing, state-of-charge estimation using Coulomb counting, and CAN bus communication to a vehicle controller. Over-voltage, under-voltage, over-temperature and short-circuit protection are all hardware-enforced.

A dissolved gas analysis (DGA) proxy system that monitors transformer oil temperature, load current and vibration signature, correlates these with known fault indicators from IEEE C57.104, and transmits alerts via MQTT to a cloud dashboard. A regression model trained on historical DGA data predicts insulation degradation stage.

A Siemens S7-1200 controlled bottle filling line with conveyor, fill station, capping station and reject mechanism — programmed in Ladder Diagram with a WinCC HMI panel showing production count, fault status and manual override. The system demonstrates industrial sequencing, interlock logic and SCADA integration.

A 3kVAR automatic power factor correction (APFC) panel that measures load power factor in real time using a CT/PT front-end, switches capacitor banks in steps using thyristor contactors, and maintains PF above 0.95 — reducing reactive power penalty charges. Includes a 4-digit LCD showing PF, kW, kVAR and kVA.

A resonant inductive coupling WPT system operating at 100kHz, transferring up to 10W across a 5cm air gap with 85% efficiency at resonance. The transmitter uses a Class-E amplifier driven by an FPGA-generated PWM signal, and the receiver charges a Li-ion battery through a rectifier and CC/CV controller.

A microcontroller-based relay that monitors three-phase voltage and current waveforms, identifies fault type (L-L, L-G, L-L-G, three-phase) using symmetrical component analysis, and trips the appropriate circuit breaker within 20ms. A serial interface logs fault events with timestamp and fault classification to a PC.

A software SCADA system built on Ignition that aggregates real-time energy consumption data from Modbus RTU smart meters across a simulated 10-zone industrial facility. The dashboard displays load curves, peak demand alerts, energy cost projections and anomaly flags, with historical data stored in a MySQL historian.

An IoT-controlled LED street lighting system where each luminaire has an NB-IoT module reporting ambient light level, presence detection data and energy consumption to a central management platform. Dimming schedules are computed by a cloud algorithm that optimises energy use against traffic density data, achieving 40% energy savings versus fixed-schedule dimming.

A 50W synchronous boost converter designed for low-voltage PV panel input (8–18V) with Perturb & Observe MPPT implemented on an STM32, achieving 96% peak conversion efficiency. The design includes soft-start, output overvoltage protection and thermal shutdown, with a Bode plot measurement setup for loop stability verification.

A thyristor-based soft starter for a 1.5kW three-phase induction motor that ramps supply voltage from 40% to 100% over a configurable 2–10 second ramp time, limiting inrush current to 2.5× rated current. A PIC microcontroller manages firing angle control and provides fault protection for over-current and phase loss.