Single Phase Inverter is an electric apparatus that changes direct current (DC) to alternating current (AC) using the power MOSFETs’ H-bridge. Power MOSFETs’ gate being protected by Gate Drivers. Gate Drivers powered by the rectifiers which can be replaced by DC source
Tools Used
- Multisim & Psim software for simulation of all the circuits used and for selecting the components used.
- Rectifier Circuits for gating the power MOSFETs.
- Arduino (ATmega328p) controls the gate drivers.
- Gate Drivers gates the power MOSFETs as per the output of Arduino
- H- bridge generates the square wave pulse.
- RC Filter for smoothening of square wave generated.
Rectifier Circuit
Rectifiers convert the ac mains supply to the dc voltage which can be regulated to desired DC output. The output of the rectifier is given to the Gate Drivers, which gates the power MOSFETs at the desired time. These rectifiers can be replaced by the DC source to be free from the AC source dependence as it is DC to AC inverter.
Arduino
Arduino (ATmega 328p) generates the square wave pulse which gates the power MOSFETs with the help of gate drivers. It’s output gates the two diagonal power MOSFETs at a time and another two at another by giving a dead time between the two.
Gate Drivers
A gate driver is a power amplifier that accepts a low-power input from a controller IC and produces a high-current drive input for the gate of a high-power transistor such as an IGBT or power MOSFET. Here the Arduino gives the signal to the gate driver which gates the power MOSFET as per the signal.
H-Bridge
Power MOSFETs’ H-bridge converts the DC input to an AC signal by gating the 1 and 2 power MOSFETs for 10ms and 3 and 4 power MOSFETs for the next 10ms thus getting a frequency of 50Hz. To avoid the overlapping of the two signals a delay of 3 microseconds is also given between the two. The output of the H-bridge is given to the Filter circuit.
RC Filter
RC Filter converts the output of the power MOSFET H-bridge approximately into a sine wave . This is the desired output as sinewave which can be used in our household purposes.
Results
