Implementation of Synchronous Bidirectional Converter Using a Fuzzy Logic Controller
Virbora Ny,
Saran Meas,
Channareth Srun
Issue:
Volume 11, Issue 5, October 2023
Pages:
99-114
Received:
15 August 2023
Accepted:
1 September 2023
Published:
20 September 2023
Abstract: A bidirectional converter is necessary for power transfer between two different voltage levels. This paper describes the implementation of the combined conventional buck and boost converter as the bidirectional converter, using the fuzzy logic controller as the control algorithm. The intrinsic diode of the MOSFET is used when the MOSFET is not in conduction mode, these diodes work as a conventional diode in each power conversion mode. The synchronous switching mode for both MOSFETs reduces the power losses during the switching due to the low RDS of the MOSFET over conventional diodes. Analyzing the parasitic resistance for both passive and active components helps optimize the component’s parasitic parameters to obtain optimal efficiency. The design of the fuzzy logic controller consists of fuzzy rules with the Mamdani inference system and membership function parameter tuning to achieve the best performance on low overshoot and fast transient response. The fuzzy logic controller is designed as a single controller to be compatible with both power conversion directions. The optimized design of only 8 fuzzy rules proved to be efficient for a fast microcontroller runtime with a robust transient response. The bidirectional converter can achieve up to 96% efficiency for the buck mode of 290W and 91% efficiency for the boost mode of 260W.
Abstract: A bidirectional converter is necessary for power transfer between two different voltage levels. This paper describes the implementation of the combined conventional buck and boost converter as the bidirectional converter, using the fuzzy logic controller as the control algorithm. The intrinsic diode of the MOSFET is used when the MOSFET is not in c...
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Research Article
Simulation Study on Self-Focusing Effect of Satellite Laser Communication Under Extreme Ionospheric Conditions
Issue:
Volume 11, Issue 5, October 2023
Pages:
115-120
Received:
19 July 2023
Accepted:
23 August 2023
Published:
3 November 2023
Abstract: Satellite laser communication has developed rapidly, with advantages such as strong anti-interference ability, good confidentiality, high communication rate, freedom from frequency resource constraints, large capacity, small equipment size, low power consumption, and light weight, which can meet the increasingly high requirements for data transmission rate and security in maritime communication. When laser propagates in the ionospheric plasma, the laser pulse undergoes a self-focusing effect. Under extreme conditions such as sudden ionospheric disturbances, the electron density in the ionosphere greatly increases, which has a significant impact on laser transmission. This article analyzes the mechanism of focused beam generation, uses PIC method to simulate the self-focusing effect of laser under extreme conditions in the ionosphere, and studies and determines the method of introducing self-focusing effect in PIC simulation. The self-focusing electric field structure is compared with beams without self-focusing with the same parameters. The results indicate that when laser propagates under extreme conditions in the ionosphere, the front edge of the laser pulse bends, and its laser oscillation frequency increases. In the latter half of the laser pulse, due to the self-focusing effect of the plasma, the width of the laser pulse decreases and the focusing effect is obvious.
Abstract: Satellite laser communication has developed rapidly, with advantages such as strong anti-interference ability, good confidentiality, high communication rate, freedom from frequency resource constraints, large capacity, small equipment size, low power consumption, and light weight, which can meet the increasingly high requirements for data transmiss...
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