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SHREE ELECTRONICS

"USEFUL TECHNICAL INFORMATION OF DRIVES"

Block Diagram of VFD / AC Drive

VFD / AC Drive have following sections—

1- Precharging Section- When we give power supply to Drive Input then Precharging section will build up DC link voltage approximately 80%. This section mostally made by diode and resistance.

2- Rectifier Section- When DC Voltage reaches 80% Then Rectifier will start working and will charge DC link Voltage 100%. This section mostally made by diode or thyristors .

3- DC Link- Rectifier output which will be Inverter Input called DC link Section this section having capacitor bank for rectifier output DC voltage Filtration purpose .In some of drives on DC link breaking chopper will also available.For example Siemens MM440 and Sinamics G120 up to 75 kw ratings.

4- Inverter Section – This section generate desired output frequency and voltage . Output of inverter goes to Motor.This section made by IGBT. refer above diagram.

Credit ——- Raza

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