Bidirectional Phase-Shifted Full-Bridge Converter
Purpose
Bidirectional phase-shifted full-bridge converter with optional series capacitor
Library
Electrical / Nanostep
Description
This component implements a bidirectional phase-shifted full-bridge converter with free-wheeling on the low voltage side. A series DC blocking capacitor is optional.
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 a DC link. Therefore, the gate signals for the upper and lower switch in the same leg of the front-end full-bridge must never both become true at the same time. Also, DC voltage 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.- Include series capacitor
Allows you to include (
yes) or remove (no) the series capacitor.- Series capacitance
A scalar specifying the capacitance of the series capacitor, in farads \((\mathrm{F})\).
- 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 \((\Omega)\).
- Include magnetizing inductance
Allows you to include (
yes) or remove (no) the magnetizing inductance.- 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.
- Filter inductance
A non-zero scalar specifying the low voltage side filter inductance, in henries \((\mathrm{H})\).
- Filter resistance
A scalar specifying the low voltage side filter resistance, in ohms \((\Omega)\).
- 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 series capacitor.
Nanostep Probe Signals
See Fig. 254 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 front-end DC link into the converter.
- Filter current
The current through the secondary side filter inductor.
- Snubber current
The current flowing through the snubber switch, from the converter to the low voltage side.
- Capacitor voltage
The voltage across the series 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.
- Snubber gate signal
The gate signal of the snubber semiconductor switch.
Fig. 254 Nanostep Probe Signals for the Bidirectional Phase-Shifted Full-Bridge Converter