Active Front End

[rahuljadhav1]

Hi dear all,

 

What is active front end concept?

 

Regards

 

Rahul

[marke]

Hello rahuljadhav1

 

An active front end for a drive is where the rectifier has been replaced by an IGBT bridge (rather than a rectifier bridge) and the IGBTs are used to rectify the the AC supply to create the DC bus. The IGBT bridge is supplied via a three phase reactor and the IGBTs are controlled with a PWM waveform such that a sinusoidal current is drawn from the supply. When the drive is regenerating, the DC bus voltage rises and the "active front end" acts as an inverter to convert the DC into AC and drive it back into the supply.

Some manufacturers can convert a standard drive output stage into an active input stage by changing the software. In some drives, such as the Control Techniques SP drives, the conversion simply requires the setting of one parameter.

 

Best regards,

[rahuljadhav1]

Hello rahuljadhav1

 

An active front end for a drive is where the rectifier has been replaced by an IGBT bridge (rather than a rectifier bridge) and the IGBTs are used to rectify the the AC supply to create the DC bus. The IGBT bridge is supplied via a three phase reactor and the IGBTs are controlled with a PWM waveform such that a sinusoidal current is drawn from the supply. When the drive is regenerating, the DC bus voltage rises and the "active front end" acts as an inverter to convert the DC into AC and drive it back into the supply.

Some manufacturers can convert a standard drive output stage into an active input stage by changing the software. In some drives, such as the Control Techniques SP drives, the conversion simply requires the setting of one parameter.

 

Best regards,

 

 

thank you sir.

 

take care

 

regards

 

Rahul