Full-Bridge LLC Converter with Synchronous Rectification
Purpose
Full-bridge LLC resonant converter with synchronous rectification
Library
Electrical / Nanostep
Description
This component implements an isolated LLC resonant converter with a full bridge on the primary side and a half-bridge synchronous rectifier on the secondary side. To realize a full-bridge synchronous rectifier, use the CLLLC Converter component configured without secondary-side capacitance.
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
- Leakage inductance
A non-zero scalar specifying the primary side leakage inductance of the transformer, in henries \((\mathrm{H})\).
- Leakage winding resistance
A scalar specifying the resistance of the primary winding, 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 flags an error for combinations of gate signals that cause shoot-through. When set tooff, these errors are not checked during real-time simulation.
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. 266 for the Nanostep probe signal positions.
- 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.
- 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.
- Capacitor voltage
The voltage across the resonant capacitor.
- Primary gate signals
A vector containing the gate signals of the primary side semiconductor switches.
- Secondary gate signals
A vector containing the gate signals of the secondary side semiconductor switches.
Fig. 266 Nanostep Probe Signals for the Full-Bridge LLC Converter with Synchronous Rectification