Analysis Synthesis and Implementation of Linear Energy Mixer by a Real-time Digital Signal Procesor

Abstract

Multiple-Input Buck–Boost (MIBB) dc–dc converters receive energy from two or more energy sources that can Deliver Several Outputs of variable power. There are situations in which it is advantageous to use a buck-boost converter, i.e., when there is no guarantee that the input voltage will always be higher or always lower than the output voltage. This happens for example when there is an input voltage in an inverter that makes the interface between the photovoltaic panels or wind generators and the electrical grid. Here, we present a trigger-controlled MIBB converter topology with various input voltage sources and energy diversification of 0–100% of each source, determined by a pre-determined arbitrary value. The full-range linear transfer function of the controller drives the closed-loop MIBB system to operate as a linear single-input buck–boost converter. The response time of the controller is about 400 μs and therefore allows for high-speed real-time control. The intelligent fixed frequency switching strategy overcomes the limitations of present multiple-input converters by switching period sharing. System performance was verified by simulations and an experimental setup with two source inputs. It is shown that the system can be treated as a linear system, controlled by a single parameter—K. As a result, a simple to control MIBB system with a wide input/output range and fast response time is presented.