Full-Bridge LLC Converter

Purpose

Full-bridge LLC resonant converter, optimized for Real-Time Simulations on the RT Box.

Library

Electrical / Nanostep

Description

This component implements an isolated LLC resonant converter with a full bridge on the input side.

Both sides of the converter have current source behavior and must each be connected directly to a capacitor or a voltage source.

The power semiconductors are modelled as ideal switches controlled by instantaneous logical gate signals. A switch is turned on when the corresponding gate signal is true.

C code generated from this component is suitable for real-time simulations on the RT Box, where it is executed on a Nanostep solver. In this case, connect the gate inputs to PWM Capture blocks from the RT Box component library.

Note

This component has a Nanostep solver weight of \(3\), indicating that it occupies one entire Nanostep solver for Real-time Simulations on the RT Box.

Note

The voltage sources connected to the converter must not be short-circuited. Therefore, combinations of switching signals that cause shoot-through of DC links are not permitted. Additionally, DC voltages across diodes must not be negative, as DC voltage clamping through diodes is not permitted.

Parameters

Certain parameters are associated with specific components. The corresponding component labels such as \(\mathrm{L}\), \(\mathrm{C}\), etc., are shown in Fig. 269.

Semiconductor symbol

Use this setting to choose between IGBT and MOSFET for the symbol of the active semiconductor switches. This setting only affects the schematic representation and does not change the electrical behavior of the component.

Output rectifier

Use this setting to choose between center-tapped Half bridge and Full bridge output rectifier topology.

Primary inductance

A non-zero scalar specifying the primary-side inductance \(\mathrm{L}\), including the transformer leakage inductance and any external series-connected inductor, in henries \((\mathrm{H})\).

Winding resistance

A scalar specifying the winding resistance \(\mathrm{R_L}\), in ohms \((\Omega)\).

Magnetizing inductance

A non-zero scalar specifying the magnetizing inductance of the transformer \(\mathrm{L_m}\), referred to the primary side, in henries \((\mathrm{H})\).

Turns ratio

A scalar specifying the ratio of primary-side turns to secondary-side turns.

Resonant capacitance

A non-zero scalar for the resonant capacitance \(\mathrm{C}\) on the primary side, in farads \((\mathrm{F})\).

Assertions

When set to on, the block flags an error for combinations of gate signals that cause shoot-through.

Probe Signals

See Fig. 269 for the probe signal positions.

Inductor current

The current through the inductor \(\mathrm{L}\), in amperes \((\mathrm{A})\), defined positive in the direction of the arrow.

Magnetizing current

The current through the inductor \(\mathrm{L_m}\), in amperes \((\mathrm{A})\), defined positive in the direction of the arrow.

Capacitor voltage

The voltage across the capacitor \(\mathrm{C}\), in volts \((\mathrm{V})\), defined positive at the side marked with (+).

Nanostep Probe Signals

Inductor current

The current through the inductor \(\mathrm{L}\), in amperes \((\mathrm{A})\), defined positive in the direction of the arrow.

Magnetizing current

The current through the inductor \(\mathrm{L_m}\), in amperes \((\mathrm{A})\), defined positive in the direction of the arrow.

Primary current

The current at the primary-side converter terminals, in amperes \((\mathrm{A})\), defined positive in the direction of the arrow.

Secondary current

The current at the secondary-side converter terminals, in amperes \((\mathrm{A})\), defined positive in the direction of the arrow.

Capacitor voltage

The voltage across the capacitor \(\mathrm{C}\), in volts \((\mathrm{V})\), defined positive at the side marked with (+).

Gate signals

A vector containing the gate signals of the active semiconductor switches.

Fig. 269 Probes for the Full-Bridge LLC Converter

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↳ Added in PLECS 4.9.