Full-Bridge LLC Converter

Purpose

Full-bridge LLC resonant converter

Library

Electrical / Nanostep

Description

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

The converter is simulated with time steps in the single-digit nanosecond range. The required Nanostep solver is available exclusively on the RT Box. Both sides of the converter have current source behavior and must each be connected directly to a capacitor or a voltage source. The implementation has a weight of 3, which means it occupies an entire Nanostep solver. For offline simulation, all power semiconductors in the converter are modeled with ideal switches. The individual switches are controlled with instantaneous logical gate signals. A switch is turned on when the corresponding gate signal is true.

Note

The Nanostep implementation cannot simulate a shoot-through or clamping of the DC sides. Therefore, the gate signals for the upper and lower switch in the same leg must never both become true at the same time. Also, the applied DC voltages must never become negative.

Parameters

Semiconductor symbol

This setting lets you choose between IGBT and MOSFET for the symbol of the active semiconductor switches. It does not change the electrical behavior of the converter in simulation.

Output rectifier

This setting lets you choose between center-tapped Half bridge and Full bridge output rectifier topology.

Leakage inductance

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

Winding resistance

A scalar specifying the resistance of the primary winding \(R\), in ohms \((\Omega)\).

Magnetizing inductance

A non-zero scalar specifying the magnetizing inductance of the transformer, 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, in farads \((\mathrm{F})\).

Assertions

When set to on, the block will flag an error if both gate signals in any of the two half-bridges become true.

Probe Signals

Inductor current

The current flowing into the primary side of the transformer.

Magnetizing current

The current through the magnetizing inductor, referred to the primary side.

Capacitor voltage

The voltage across the resonant capacitor.

Nanostep Probe Signals

See Fig. 265 for the probe signal positions.

Fig. 265 Probes for the Full-Bridge LLC Converter

Inductor current

The current flowing into the primary side of the transformer.

Magnetizing current

The current through the magnetizing inductor, referred to the primary side.

Capacitor voltage

The voltage across the resonant capacitor.

Primary current

The current flowing from the primary DC link into the converter.

Secondary current

The current flowing from the secondary DC link into the converter.

Gate signals

A vector containing the gate signals of the primary side semiconductor switches.