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# Ideal Transformer

Ideal transformer in electrical systems

## Library

Electrical Elements

## Description

The Ideal Transformer block models an ideal power-conserving transformer, described with the following equations:

`$V1=N·V2$`
`$I2=N·I1$`

where

 `V1` Primary voltage `V2` Secondary voltage `I1` Current flowing into the primary + terminal `I2` Current flowing out of the secondary + terminal `N` Winding ratio

This block can be used to represent either an AC transformer or a solid-state DC to DC converter. To model a transformer with inductance and mutual inductance terms, use the Mutual Inductor block.

The two electrical networks connected to the primary and secondary windings must each have their own Electrical Reference block.

### Variables

To set the priority and initial target values for the block variables prior to simulation, use the Initial Targets section in the block dialog box or Property Inspector. For more information, see Set Priority and Initial Target for Block Variables.

Nominal values provide a way to specify the expected magnitude of a variable in a model. Using system scaling based on nominal values increases the simulation robustness. Nominal values can come from different sources, one of which is the Nominal Values section in the block dialog box or Property Inspector. For more information, see Modify Nominal Values for a Block Variable.

## Parameters

Winding ratio

Winding ratio of the transformer, or ratio of primary coil turns to secondary coil turns. The default value is `1`.

## Ports

The block has four electrical conserving ports. Polarity is indicated by the + and – signs. Ports labeled 1+ and 1– are connected to the primary winding. Ports labeled 2+ and 2– are connected to the secondary winding.

## Version History

Introduced in R2007a