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Design and Simulation of Galvanically Isolated Quasi-Z-Source DC-DC Converter with a Novel ZVS Technique
(2025-01-01)
Hiransing, Bancha
;
Jangwanitlert, Anuwat
This paper focuses on design and simulation of the galvanically isolated quasi-z-source dc-dc converter with a novel zero voltage switching technique and its control method for implementing power conversion. This system applies to interface renewable energy to the dc-microgrids. The quasi-zsource converter overcomes the conceptual and theoretical barriers and limitations of the traditional voltage-source converter. This system consists of quasi-Z-source network, dcdc converter, full-bridge converter with high frequency transformer and voltage double rectifier. To describe the operating principle and control. The simulation results obtained from the MATLAB Simulink program have confirmed the proposed circuit.
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Techniques of Maximum Power Point Tracking by Using Perturb and Observe and Lookup Table Methodologies
(2025-01-01)
Lapkitticharoenchai, Yuttikarn
;
Jangwanitlert, Anuwat
– In the typical Photovoltaic (PV) system, the Perturb and Observe (P&O) technique is the algorithm that is used for tracking the Maximum Power Point (MPP). It enables the photovoltaic (PV) panel to reach the maximum power output. However, there are two main existing problems which are the slow speed of the P&O, and an oscillation of power around MPP. The problems lead to a reduction of the power output of the PV panel. This paper presents a new hybrid methodology for a faster Maximum Power Point Tracking (MPPT) application. The proposed method consists of the Lookup Table, together with the P&O techniques. The results show that the Lookup Table employs measured values of an irradiance, a temperature, and a Duty Cycle to achieve MPPT precisely. Consequently, the Lookup Table’s tracking speed is significantly faster than P&O and the oscillation of tracking power is eliminated. Moreover, the new hybrid methodology also uses P&O to record irradiance, temperature, and Duty Cycle data into the table. Once sufficient data are collected and under defined the conditions, the system automatically select to the Lookup Table for operation.
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An Improved Three-Level Full-Bridge Soft-Switching DC/DC Converter with Wide Load Range for Energy Storage System
(2024-01-01)
Sanajit, Narongrit
;
Jangwanitlert, Anuwat
This article aims to present an improved three-level full-bridge (3L-FB) DC/DC converter in which all switches can operate under soft-switching conditions for a wide load range. It is suitable for applications with high input voltage and input power. The proposed circuit has some interesting features: the voltage across the switch is only half of the input voltage. The phase-shifted switching pattern is used for the output voltage control. Furthermore, auxiliary inductors are added to the circuit to verify that the main switches are operating under the soft switching condition for a wide load range, particularly light load scenarios. And clamping diodes can also facilitate in achieving the soft switching condition, leading to improved performance by lowering the loss of semiconductor devices in the circuit. The proposed three-level full-bridge (3L-FB) DC/DC converter circuit has been designed and simulated, and the results of the prototype test at 2.5 kW of output power rating have been analyzed to confirm the performance of the proposed circuit.
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Lookup Table Technique by using Irradiation Intensity and Duty Cycle for Faster MPPT Application
(2023-01-01)
Lapkitticharoenchai, Yuttikarn
;
Jangwanitlert, Anuwat
This research shows how Lookup Table technique can track MPP. This method uses calculation to find the exact value of duty cycle that make PV panel reach MPP. Therefore, its speed is faster than classical techniques especially P&O because knowing the exact value of duty cycle can make the controller control the switching device that makes PV reach MPP directly. Moreover, the swing at MPP is less P&O. However, the Lookup Table technique still be relied P&O to track MPP in the first period for automatically recording data into the Table for the Lookup Table technique. Hence, this method is going to be combined by both of P&O and Lookup Table. It is relied on the condition which technique is going to be operated. Lookup Table technique will be operated instead of P&O when the recorded data are enough and under defined the conditions that will be explain in this paper.
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Message from Honorary Chairs
(2022-01-01)
Jangwanitlert, Anuwat
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Novel MPPT Methodology by using Daily Recorded Lookup Table Technique: Relationship between Duty Cycle and Temperature
(2022-01-01)
Lapkitticharoenchai, Yuttikarn
;
Jangwanitlert, Anuwat
This paper shows the new technique of tracking Maximum Power Point (MPP) that is faster than P&O one. Furthermore, it can reduce the swing of MPP but P&O technique never deal with. This technique uses automatically selective technique between P&O and Lookup Table to reach MPP. At first, the controller selects P&O technique to track MPP and record the data on relationship between temperature and duty cycle into the Table. When the data in the Table are more enough and the recent temperature value is under defined condition, the controller will change P&O to Lookup Table technique automatically. However, the recorded data in the Table will be reset every day for tracking MPP accurately.
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Implementation of 48 v series-input parallel-output zero-voltage switching converter using secondary resonant technique
(2021-01-01)
Meesrisuk, Watanyu
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Jangwanitlert, Anuwat
This research paper aims to propose a series-input parallel-output zero-voltage switching converter (SIPO ZVS converter) by using the secondary resonant technique for achieving the Zero-Voltage-Switching (ZVS) condition for all the main switching devices in the proposed converter. Two half-bridge converters are applied for the proposed converter, connected in series at the input side and in parallel at the output side of the proposed converter (SIPO technique). By using the SIPO technique, the voltage stress on the main switching devices is decreased to be a half of the input voltage or V<inf>dc</inf>/2. This leads to the reduction of rated voltage of main switching devices. The rated current of the rectifier diodes is also decreased because of the current sharing behavior. Moreover, the phase-shifted control method is analyzed in order to comprehend the impact on the ripple current at the output side. Finally, the prototype of the proposed converter has been designed, built, and tested in order to confirm the effectiveness of the proposed converter.
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Message from Honorary Chairs
(2020-07-01)
Jangwanitlert, Anuwat
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A Modified Three-Level Soft-Switching DC-DC Full-Bridge Converter
(2018-11-27)
Sanajit, Narongrit
;
Jangwanitlert, Anuwat
This paper aims to present a modified three-level full-bridge dc-dc converter that can operate under soft-switching conditions for all switches in the circuit. There are 2 branches of three-level half-bridge inverter. The auxiliary inductances are used in the circuit in order to confirm the zero-voltage switching condition (ZVS) for all switches for wide load ranges. Moreover, the dc blocking capacitor is used for obtaining the zero-current switching condition (ZCS) for inner switches in the circuit. The proposed circuit was designed, analyzed and simulated at 2.56 kW of output power, 540 V of input voltage, 510 V of output voltage at 60° of phase shift angle and 50 kHz of switching frequency to confirm the possibility of the proposed theory.
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A Machine for Helping the Elder Getting Up and Down from Lavatory
(2018-11-27)
Jangwanitlert, Anuwat
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Meesrisuk, Watanyu
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Sanajit, Narongrit
This research presents the design and construction of a machine for helping the elder getting up and down from the lavatory. In order to help the elder or patients with health problems while they are using the lavatory, the machine has been designed with ease of mobility and installation. A structure of prototype is made from aluminum. Two units of 12 V of actuator linear motor [1]-[3] are used for moving up and down the lid of the lavatory. Both motors are controlled to rotate in the same direction and can bear the weight up to 120 kg. The H-Bridge circuit are applied to control actuator linear motors by using a microcontroller for generating PWM gate driving signals for each MOSFET. The 12 V 88 Ah of deep cycle battery level indicator device is used for supplying the energy to the machine.

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