Three phase dual converter drive

• The schematic diagram of three phases dual converter d drive as shown in the figure.
• As per the circuit diagram converter, 1 allows motor control 1 and 4 quadrants whereas with converter 2 the operation in 2 and 3 quadrants obtained
• For reversing the polarity of motor generated emf for regeneration purpose, field circuit must be energized from a single phase or three phases full converter.

Three phases dual converter dc drive

When converter 1 or 2 is in operation

Average output voltage,

V₀ =  V_t is =  3V_{m l}/ 2∏  * Cos  ɖ₁  for 0<  ɖ₁ <  ∏

With a 3 phase full converter in the filed circuit,

V_f  =  3V_ml/2∏ * Cos  ɖ_f  for 0<  ɖ_f <  ∏

In case of circulating types of dual converter, ɖ₁  + ɖ₂ =180 degree

Application :

• Direction and speed control dc motors.

• Applicable wherever the reversible dc is required.

• Industrial variable speed dc drive.