CLLLC Converter
Purpose
Dual active bridge or resonant converter with magnetizing inductance
Library
Electrical / Nanostep
Description
This component implements an isolated, resonant CLLLC converter. By omitting the capacitors, it can be configured as a dual active bridge (DAB) with magnetizing inductance. If only the primary side capacitor is present, the component can be used as a full-bridge LLC with synchronous rectification or an LLC with secondary leakage inductance.
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
IGBTandMOSFETfor the symbol of the active semiconductor switches. It does not change the electrical behavior of the converter in simulation.- Primary leakage inductance
A non-zero scalar specifying the transformer leakage inductance of the primary side, in henries \((\mathrm{H})\).
- Primary winding resistance
A scalar specifying the winding resistance of the primary side, in ohms \((\Omega)\).
- Include primary capacitor
Allows you to include (
yes) or remove (no) a resonant capacitor at the primary side.- Primary resonant capacitance
If the Include primary capacitor option is set to
yes, this parameter requires a non-zero scalar for the resonant capacitance on the primary side, in farads \((\mathrm{F})\).- Magnetizing inductance
A non-zero scalar specifying the magnetizing inductance of the transformer, referred to the primary side, in henries \((\mathrm{H})\).
- Include secondary inductance
Allows you to include (
yes) or remove (no) a leakage inductance on the secondary side.- Secondary leakage inductance
If the Include secondary inductance option is set to
yes, this parameter requires a non-zero scalar specifying the transformer leakage inductance of the secondary side, in henries \((\mathrm{H})\).- Secondary winding resistance
A scalar specifying the winding resistance of the secondary side, in ohms \((\Omega)\).
- Include secondary capacitor
Allows you to include (
yes) or remove (no) a resonant capacitor at the secondary side.- Secondary resonant capacitance
If the Include secondary capacitor option is set to
yes, this parameter requires a non-zero scalar for the resonant capacitance on the secondary side, in farads \((\mathrm{F})\).- Turns ratio
A scalar specifying the ratio of primary-side turns to secondary-side turns.
- Assertions
When set to
on, the block will flag an error if both gate signals in any of the four half-bridges become true.
Probe Signals
- Inductor currents
The currents flowing into the primary and secondary sides of the transformer.
- Magnetizing current
The current through the magnetizing inductor, referred to the primary side.
- Capacitor voltages
The voltages across the resonant capacitors.
Nanostep Probe Signals
See Fig. 259 for the probe signal positions.
Fig. 259 Probes for the CLLLC Converter
- Inductor currents
The currents flowing into the primary and secondary sides of the transformer.
- Magnetizing current
The current through the magnetizing inductor, referred to the primary side.
- Capacitor voltages
The voltages across the resonant capacitors.
- 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.
- 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.