The isolated flyback converter is a commonly-used converter for small power supplies such as battery chargers for portable devices and for auxiliary power supplies in electronic equipment. In this report the control design of a flyback converter that provides three low-voltage DC output voltages from a single-phase mains source is explained.
The TL431 is a reference voltage source that is commonly used in the control circuit of isolated power supplies. In this example, the design of a TL431-based type 2 voltage controller for a flyback converter is presented.
Active power factor correction (PFC) is used extensively in AC-DC converters since it allows the converter to meet harmonic standards without the need for a bulky and costly input filter that normally accompanies a passive AC-DC converter. In this application example, a single phase boost-type 600 W PFC converter is modeled in PLECS.
The doubly-fed induction generator (DFIG) system is a popular system in which the power electronic interface controls the rotor currents to achieve the variable speed necessary for maximum energy capture in variable winds. Because the power electronics only process the rotor power, typically less than 25% of the overall output power, the DFIG offers the advantages of speed control with reduced cost and power losses. This PLECS demo model demonstrates a grid-connected wind turbine system using all of PLECS' physical modeling domains. The system model includes a mechanical model of the blades, hub, and shaft, a back-to-back converter including thermal loss calculations, a magnetic model of the three-phase transformer, and the transmission line and grid.
Single-phase PV inverters are commonly used in residential rooftop PV systems. In this application example, a single-phase, single-stage, grid-connected PV inverter is modeled. The PV system includes an accurate PV string model that has a peak output power of 3 kW.
This PLECS demo model shows a DC-DC flyback converter operating in discontinuous conduction mode with two outputs. The model combines the electrical power circuit with a special magnetic circuit for the flyback transformer and the discrete controller.
This PLECS demo model shows a 300 W switched-mode power supply with power factor correction. The simulation combines the electrical power circuit, the control system with a standard IC and the thermal behavior of the semiconductors.