SPWM inverter and solar-charging concept for reliable off-grid or hybrid power supply.
Overview
This power project targets rural and backup-energy applications. It combines a pure-sinewave inverter concept with solar charging so DC battery energy can be converted into usable AC power. The work connects to the thesis direction of hybrid power systems for reliable supply in rural Bangladesh.
Specifications
RolePower electronics designer
MicrocontrollerArduino / dedicated PWM controller
ModulesMOSFET driverTransformerSolar charge controllerBattery bank
ProtocolsPWMADC
Tech tagsPure Sinewave InverterSPWMSolar ChargingMPPTHybrid Power
Architecture
Solar input charges the battery, and the inverter stage converts stored DC energy into AC output using SPWM-controlled switching.
Project photos
Inverter hardware
Videos
Implementation details
Firmware
Firmware or control logic generates SPWM drive signals, monitors battery/solar state, and supports safe inverter operation.
PCB
PCB design must handle high-current switching paths, gate-drive routing, heat dissipation, and isolation between control and power sections.
Power
Battery, solar input, and inverter output require protection, fusing, heat management, and careful wiring.
Components / BOM
MOSFET H-bridge / push-pull stage, Transformer, PWM controller, Solar charge controller stage, Battery bank
Engineering challenges
Generating a clean waveform while managing heat, switching losses, and battery protection is the core challenge.
Solutions
Separated control and power stages and focused the prototype on SPWM waveform generation with solar-charging integration.
Results & metrics
Demonstrates the architecture of a hybrid solar backup-power system.
Future improvements
Add closed-loop voltage feedback, LC filtering, thermal protection, MPPT optimization, and enclosure testing.
