# Converter

Connect three-phase AC network to DC network

Semiconductors

## Description

The Converter block models a three-arm converter circuit that connects a three-phase AC network to a DC network.

Each component in the three-arm circuit is the same switching device, which you specify using an option on the Converter block dialog box. The switching devices that you can specify are in the Semiconductors / Fundamental Components library.

The figure shows the equivalent circuit for a converter with fully controlled switching devices (e.g. IGBTs, GTOs).

The figure shows the equivalent circuit for a converter with partially controlled switching devices (e.g. thyristors).

Control the gate ports of the six switching devices via an input to port G on the Converter block:

1. Multiplex all six gate signals into a single vector with a Six-Pulse Gate Multiplexer block.

2. Connect the output of the Six-Pulse Gate Multiplexer block to the Converter block `G` port.

You can specify an integral protection diode for each switching device. An integral diode protects the semiconductor device by providing a conduction path for reverse current. An inductive load can produce a high reverse-voltage spike when the semiconductor device suddenly switches off the voltage supply to the load.

The table shows you how to set the Integral protection diode parameter based on your goals.

GoalValue to SelectBlock Behavior
Prioritize simulation speed.`Protection diode with no dynamics`The block includes an integral copy of the Diode block. The block dialog box shows parameters relating to the Diode block.
Precisely specify reverse-mode charge dynamics.`Protection diode with charge dynamics`The block includes an integral copy of the Commutation Diode block. The block dialog box shows parameters relating to the Commutation Diode block.

You can include a snubber circuit, consisting of a resistor and capacitor connected in series, for each switching device. Snubber circuits protect switching devices against high voltages that inductive loads produce when the device turns off the voltage supply to the load. Snubber circuits also prevent excessive rates of change of current when a switching device turns on.

## Parameters

### Switching Devices Tab

Switching device

Converter switching device. The default value is ```Ideal Semiconductor Switch```.

The switching devices you can select are:

• `GTO`

• `Ideal Semiconductor Switch`

• `IGBT`

• `MOSFET`

• `Thyristor`

#### GTO Parameters

When you select `GTO`, parameters for the GTO block appear.

#### Ideal Semiconductor Switch Parameters

When you select `Ideal Semiconductor Switch`, parameters for the Ideal Semiconductor Switch block appear.

#### IGBT Parameters

When you select `IGBT`, parameters for the IGBT block appear.

#### MOSFET Parameters

When you select `MOSFET`, parameters for the MOSFET block appear.

#### Thyristor Parameters

When you select `Thyristor`, parameters for the Thyristor block appear.

### Protection Diodes Tab

Integral protection diode

Integral protection diode for each switching device. The default value is `None`.

The diodes you can select are:

• `Protection diode with no dynamics`

• `Protection diode with charge dynamics`

#### Parameters for Protection Diode with No Dynamics

When you select `Protection diode with no dynamics`, additional parameters appear.

#### Parameters for Protection Diode with Charge Dynamics

When you select `Protection diode with charge dynamics`, additional parameters appear.

### Snubbers Tab

Snubber

Snubber for each switching device. The default value is `None`.

Snubber resistance

Snubber resistance. This parameter is visible only if you set Snubber to ```RC snubber```. The default value is `0.1` `Ohm`.

Snubber capacitance

Snubber capacitance. This parameter is visible only if you set Snubber to ```RC snubber```. The default value is `1e-7` `F`.

## Ports

The block has the following ports:

`G`

Vector input port associated with the gate terminals of the switching devices. Connect this port to a Six-Pulse Gate Multiplexer block.

`~`

Expandable three-phase port

`+`

Electrical conserving port associated with the DC positive terminal

`-`

Electrical conserving port associated with the DC negative terminal