Application Examples

This demonstration shows how to perform a Steady-State Analysis and use small-signal analysis to obtain different open-loop transfer functions for an unregulated buck converter. The transfer function can be calculated by performing an AC Sweep or Impulse Response Analysis, which both inherently first execute a Steady-State Analysis, or alternatively, using the Multitone Analysis, which does not execute a Steady-State Analysis.

Tags:
#Controls, #Tools
#Power-Supplies

This demonstration shows a buck converter with a digital controller implementation. The controller block uses a configurable subsystem that can be toggled between a continuous and discrete proportional integral derivative (PID) control scheme. By looking under the mask (Ctrl+U) of the PID Controller block, two further masked subsystems contain the S- and Z-domain controllers.

Tags:
#Controls, #Tools
#Power-Supplies

This demonstration is based on the demo model "Buck Converter with Analog Controls" in the PLECS demo models library. It performs a sweep of the inductor value in a simulation script. This demo model is particularly useful to implement any kind of parameter sweep in other models as the basic structure serves as a good starting point.

Tags:
#Controls, #Tools
#Power-Supplies

This demonstration shows a simple unregulated buck converter including a basic thermal model. Blocks from the PLECS thermal domain are used to calculate the switching and conduction losses of the IGBT and diode, as well as model the thermal impedance network between device junctions and ambient environment. Control domain blocks are then used to calculate the component loss information and converter efficiency.

Tags: #Thermal, #Tools, #Basic-Topologies

This demonstration shows how to generate the frequency response of a non-switched network. In this example, a Bode plot is produced for a first-order RC network, specifically with the behavior of a low pass filter. For PLECS Standalone a Simulation Script is included where a parameter sweep can be executed for various values of the passive components to quickly optimize a filter network design.

Tags: #Tools, #Basic-Topologies

This demonstration shows an ideal MOSFET inverter that is controlled by a custom PWM scheme. The modulation logic is implemented as a state machine using the PLECS C-Script block. Minimum switch on-time and dead time parameters can be configured for observing timing effects on the simulated waveforms.

Tags: #Controls, #Tools, #Power-Supplies

This example demonstrates PLECS Standalone code generation capabilities for physical systems including electrical circuits. In this model ANSI-C code is generated to represent a three-phase thyristor (SCR) rectifier circuit. The model performance using generated C code is benchmarked against the baseline system using native PLECS components. Code generation for physical systems is essential to model physical plants in a real-time simulation environment, such as with the RT Box family of simulators. Please note that in order to enable code generation and run this simulation, you will need a PLECS Coder license.

Tags: #Tools, #Power-Supplies

This demonstration shows a rainflow counting algorithm that predicts the lifetime of semiconductor devices in a direct torque-controlled (DTC) motor drive under different load conditions. The calculation is based on the temperature profile of the power semiconductors from a transient electro-thermal simulation.

Tags:
Choose from #Thermal, #Controls, #Tools
Choose from #Motor-Drives

This example model demonstrates space vector control of a three-phase boost-type rectifier. The Space Vector PWM block included with PLECS is implemented using a C-Script block. The code-based implementation can be viewed to study the definition of the switching matrices, reference vector magnitude and angle calculations, sector detection logic, and calculation of relative on-times.

Tags: #Controls, #Tools, #Power-Supplies