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Stability Considerations
Published in K. Kit Sum, Switch Mode Power Conversion, 2017
In a power converter, negative feedback is employed around a loop containing amplifier(s), comparator, modulator, filter components, and so on. At zero or very low frequencies, the loop gain (including the error amplifier stage) exhibits a phase lag of approximately 180° by virtue of the negative polarity of the feedback signal. As the frequency increases, the components within this loop will begin to contribute a certain amount of phase shift (usually a lag due to the presence of a low-pass filter at the output) . If at some particular frequency this phase lag is equal to 180°, then a total of 360° lag is reached. Under this condition, the feedback signal will be in phase with the input signal. If at this particular frequency the loop gain is unity (0 dB) or greater, the system will oscillate.
Non-Isolated Unidirectional Multistage DC-DC Power Converter Configurations
Published in Frede Blaabjerg, Mahajan Sagar Bhaskar, Sanjeevikumar Padmanaban, Non-Isolated DC-DC Converters for Renewable Energy Applications, 2021
Frede Blaabjerg, Mahajan Sagar Bhaskar, Sanjeevikumar Padmanaban
The DC-DC power converter configurations are shown in Figure 3.1 [71]. A DC-DC power converters, AC-AC power converters, AC-DC power converters, and DC-AC power converters are the general configurations of power electronics converters. The DC-DC and DC-AC power converters are significant configurations of power electronics converters and play a vital role in photovoltaic and industrial applications [72–77]. Further, isolated and non-isolated DC-DC power converters are the main configurations of DC-DC converters [26–29,78,79]. In isolated DC-DC power converter configurations, load and input are isolated electrically by utilizing transformer and coupled inductors [80–82].
Variable Structure Control Techniques
Published in Bogdan M. Wilamowski, J. David Irwin, Control and Mechatronics, 2018
Asif Šabanović, Nadira Šabanović-Behlilović
The role of a power converter is to modulate electrical power flow between power sources. A converter should enable interaction of any input source to any output source of the power systems interconnected by converter (Figure 13.1). Disregarding wide variety of designs in most switching converters, control of power flow is accomplished by varying the length of time intervals for which one or more energy storage elements are connected to or disconnected from the energy sources. That allows analysis of converter as switching matrix enabling interconnections and that way creating systems with variable structure.
Performance Comparison of Optimization Algorithm Tuned PID Controllers in Positive Output Re-Lift Luo Converter Operation for Electric Vehicle Applications
Published in IETE Journal of Research, 2022
R. Femi, T. Sree Renga Raja, R. Shenbagalakshmi
This motivates our work on developing a closed-loop control strategy for a high gain PO-RL converter in EV applications. In power electronic systems, power converters are used to convert an unregulated input power source to a regulated output power supply and find wider applications in industries, computer peripherals, motor drives, electric vehicles, medical electronics equipment, etc. Voltage with higher output gain values can be achieved by raising the number of turns of interleaved inductor topology and coupling them together or by incorporating a more significant number of passive components. Hence, these high gain converter topologies include higher costs, circuit complexity, and bulkiness. The boost converter architecture with three levels and cascaded coupled converters delivers twice the output voltage of a typical boost converter. However, due to the use of two switches, the power loss of the converter gets increased [20–22]. Switched capacitor premised boost converters with specified voltage gain are used for low voltage applications because they are simple and efficient. To get high voltage gain, adding n-component in switched capacitor boost converter with high-cost passive elements [23–24].
Buck-boost converter with simple gate control for renewable energy applications
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
Muhammad Ado, M Saad BinArif, Awang Jusoh, Abdulhamid Usman Mutawakkil, Ibrahim Mohammed Danmallam
To solve the problem of voltage variation associated with solar PV and FC RE sources, DC-DC converters are required (Demirbas 2007). DC-DC converters are a class of power converters that convert DC voltages from one magnitude to another and are essential in applications involving DC voltages of variable magnitudes. Power converters are electronic devices responsible for converting electric energy from a magnitude or form to another (Ado et al. 2019a).