Documentation

Rectifier

Convert three-phase AC voltage to DC voltage

Library

Semiconductors

Description

The Rectifier block models a three-arm diode bridge circuit that converts a three-phase AC voltage to a DC voltage. The figure shows the equivalent circuit for the three-arm diode bridge.

Using the Charge Dynamics tab of the block dialog box, you can choose the type of diode that the three-arm bridge circuit uses. The table shows you how to set the Model dynamics parameter based on your goals.

GoalValue to SelectBlock Behavior
Prioritize simulation speed.No dynamicsEach arm of the bridge circuit uses a copy of the Diode block. The block dialog box does not display additional parameters.
Precisely specify reverse-mode charge dynamics.Model charge dynamicsEach arm of the bridge circuit uses a copy of the Commutation Diode block. The block dialog box shows parameters relating to the Commutation Diode block.

Parameters

Main Tab

Forward voltage

Minimum voltage required across the + and - ports of each diode for the gradient of the diode i-v characteristic to be 1/Ron, where Ron is the value of On resistance. The default forward voltage value is 0.8 V.

On resistance

Rate of change of voltage versus current above the forward voltage for each diode. The default value is 0.001 Ohm.

Off conductance

Conductance of each reverse-biased diode. The default value is 1e-5 1/Ohm.

Charge Dynamics Tab

Model dynamics

Diode charge dynamics. The default value is No dynamics.

The charge dynamics options you can select are:

  • No dynamics

  • Model charge dynamics

Parameters for Model charge dynamics

When you select Model charge dynamics, additional parameters appear.

 Additional Parameters for Model charge dynamics

For more information on these parameters, see Commutation Diode.

Ports

The block has the following ports:

~

Expandable three-phase port

+

Electrical conserving port associated with the positive terminal

-

Electrical conserving port associated with the negative terminal

Introduced in R2013b

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