Allows the user to explore the impact of parameter choices on the I-V and C-V characteristics for a surface-potential-based MOSFET model. To open this example, in the MATLAB® Command Window, type: ee_mosfet_characteristics.

Control the output voltage of a buck converter. To adjust the duty cycle, the Control subsystem uses a PI-based control algorithm. The input voltage is considered constant throughout the simulation. A variable resistor provides the load for the system. The total simulation time (t) is 0.25 seconds. At t = 0.15 seconds, the load changes.

Control a four-quadrant chopper. The Control subsystem implements a simple PI-based control algorithm for controlling the output current. The simulation uses both positive and negative references. The total simulation time (t) is 1 second. At t = 0.5 seconds, the polarity of the load DC source E is changed.

This is the base model for analysis workflow examples.

Model a switching power supply that converts a 30V DC supply into a regulated 15V DC supply. The model can be used to both size the inductance L and smoothing capacitor C, as well as to design the feedback controller. By selecting between continuous and discrete controllers, the impact of discretization can be explored.

A representative marine half-ship electrical power system with base load, hotel load, bow thrusters and electric propulsion.

Use different levels of fidelity in power converters. The system contains three converters. The top converter uses ideal switches and protection diodes at a 10 us sample time. To yield accurate results even though the model is under sampled at 50 us sample time, the middle converter uses averaged switches with averaged pulses. To further increase the sample rate and to operate as an ideal averaged converter, the bottom converter uses averaged switches and modulation waveforms instead of gate pulses. The Control subsystem contains a three-phase, two-level PWM waveform generator. The Scopes subsystem contains Scope blocks that allow you to see the simulation results.

A three-phase matrix converter that drives a static load and draws unity power factor at the source. The Scopes subsystem contains scopes that allow you to see the simulation results.

How a varistor may be applied to a buck converter in order to protect the switching MOSFETs from over-voltages due to a differential surge.

Control the output voltage of an inverting topology buck-boost converter. The inverting topology buck-boost converter uses only a single switch and the output voltage is of the opposite polarity than the input. To adjust the duty cycle, the Control subsystem uses a PI-based control algorithm. The input voltage and the system load are considered constant throughout the simulation. The total simulation time (t) is 0.25 seconds. At t = 0.15 seconds, the voltage reference changes and the system switches from buck mode to boost mode.

Correct the power factor using a PFC pre-converter. This technique is useful when non-linear impedances, such as Switch Mode Power Supplies, are connected to an AC grid. As the current flowing through the inductor is never zero during the switching cycle, the boost converter operates in Continuous Conduction Mode (CCM). The inductor current and the output voltage profiles are controlled using simple integral control. During start up, the reference output voltage is ramped up to the desired voltage.