# Rectifier

Convert three-phase AC voltage to DC voltage

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 dynamics`Each 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 dynamics`Each 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.

## 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