scholarly journals A New LLSC Series Quasi-Resonant Converter With Narrow Switching Frequency Variation

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 113175-113182
Author(s):  
Tianyu Zhu ◽  
Yanchao Ji ◽  
Jianze Wang ◽  
Yiqi Liu
Keyword(s):  
Frequency Variation ◽  
Switching Frequency ◽  
Resonant Converter

scholarly journals Resonant converter for Data Center and Super Computer applications

2019 ◽  
Vol 8 (3) ◽  
pp. 3873-3877
Keyword(s):  
Data Center ◽  
Control Method ◽  
Load Sharing ◽  
Computer Applications ◽  
Prototype Model ◽  
Frequency Variation ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Half Wave ◽  
Super Computer

In this article proposes the load sharing performance of converters in supercomputers. A new control method is proposed for dc to dc switch controlled capacitor (SCC) - LLC converter. The switching frequency is utilized for controlling the regulation of output voltage. It can give the good frequency variation range and peak gain range compared to conventional converters. To attain load sharing the half wave switch controlled capacitor (SCC) is used to control the resonant frequency of each LLC stage. The simulation results are compared with experimental results. A 600w prototype model is developed to prove the feasibility

PWM–PFM hybrid controlled LCC resonant converter with wide ZVS range and narrow switching frequency variation

2017 ◽  
Vol 53 (17) ◽  
pp. 1218-1220 ◽  
Author(s):  
Yiming Chen ◽  
Jianping Xu ◽  
Jing Cao ◽  
Leiming Lin ◽  
Hongbo Ma
Keyword(s):  
Frequency Variation ◽  
Switching Frequency ◽  
Resonant Converter

scholarly journals Wide Voltage Resonant Converter Using a Variable Winding Turns Ratio

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 370 ◽  
Author(s):  
Bor-Ren Lin ◽  
Chu-Xian Dai
Keyword(s):  
Low Voltage ◽  
Field Effect Transistors ◽  
Oxide Semiconductor ◽  
Resonant Circuit ◽  
Frequency Variation ◽  
Switching Frequency ◽  
Voltage Gain ◽  
Resonant Converter ◽  
Voltage Range ◽  
Llc Resonant Converter

This paper presents a inductor–inductor–capacitor (LLC) resonant converter with variable winding turns to achieve wide voltage operation (100–400 V) and realize soft switching operation over the entire load range. Resonant converters have been developed for consumer power units in computers, power servers, medical equipment, and adaptors due to the advantages of less switching loss and better circuit efficiency. The main disadvantages of the LLC resonant converter are narrow voltage range operation owing to wide switching frequency variation and limited voltage gain. For computer power supplies with hold-up time function, electric vehicle battery chargers, and for power conversion in solar panels, wide input voltage or wide output voltage operation capability is normally demanded for powered electronics. To meet these requirements, the variable winding turns are used in the presented circuit to achieve high- or low-voltage gain when Vin is at low- or high-voltage, respectively. Therefore, the wide voltage operation capability can be implemented in the presented resonant circuit. The variable winding turns are controlled by an alternating current (AC) power switch with two back-to-back metal-oxide-semiconductor field-effect transistors (MOSFETs). A 500-W prototype is implemented and test results are presented to confirm the converter performance.

scholarly journals Switching Regulation in the Control of 5-Phase Permanent Magnet Synchronous Motor Fed by 3×5 Direct Matrix Converter

2021 ◽  
Vol 23 (1) ◽  
pp. 27-35
Author(s):  
Muhammad Ishaq ◽  
Yanbo Che ◽  
Kifayat Ullah
Keyword(s):  
Permanent Magnet ◽  
Predictive Control ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Matrix Converter ◽  
Control Technique ◽  
Frequency Regulation ◽  
Frequency Variation ◽  
Switching Frequency ◽  
Output Current

Matrix converter is an AC-AC direct power converter comprising of an array of bi-directional switches. It does not require an intermediate DC-link and allows sinusoidal output waveforms with varying amplitudes and frequencies. The configuration of these bi-directional switches decides the number of inputs and outputs of the matrix converter. This research uses a direct matrix converter (DMC) as a phase-changing device that can convert a three-phase AC voltage into a 5-phase AC voltage. The DMC is modulated with the model predictive control algorithm. The output of DMC is fed to a five-phase permanent magnet synchronous motor (PMSM). The model predictive current control technique for DMC is carried out by developing a mathematical model of an input filter and PM motor used as a load. The predictive control of DMC results in sinusoidal output current, and it also enables the frequency variation in the output current. This frequency variation is useful in controlling the speed of the motor connected to the load. After controlling the 5-phase motor, the switching frequency regulation is done to observe its effect on the motor's stator current waveforms. Switching frequency regulation helps to limit the unnecessary switching of DMC. We developed a MATLAB-based Simulink model to study PMSM, and detailed results are presented. The results show that switching regulation can significantly reduce the switching frequency without compromising the current waveform quality.

Univesal Design of LLC Resonant Converter with Fixed Switching Frequency

2020 ◽  
Author(s):  
Jiangtao Xu ◽  
Yun Wei ◽  
Xin Cheng ◽  
Hua Yang ◽  
Hongxiang Xue ◽  
...  
Keyword(s):  
Switching Frequency ◽  
Resonant Converter ◽  
Llc Resonant Converter

An 8kW LLC resonant converter in plasma power supply based on SiC power devices for efficiency improvement

Circuit World ◽  
2019 ◽  
Vol 45 (4) ◽  
pp. 181-188
Author(s):  
Zhenmin Wang ◽  
Wenyan Fan ◽  
Fangxiang Xie ◽  
Chunxian Ye
Keyword(s):  
Silicon Carbide ◽  
Power Supply ◽  
High Frequency ◽  
Experimental Results ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Plasma Power ◽  
Power Devices ◽  
Content Type ◽  
Llc Resonant Converter

Purpose This paper aims to present an 8 kW LLC resonant converter designed for plasma power supply with higher efficiency and lighter structure. It presents how to solve the problems of large volume and weight, low performance and low efficiency of traditional plasma power supply. Design/methodology/approach At present, conventional silicon (Si) power devices’ switching performance is close to the theoretical limit determined by its material properties; the next-generation silicon carbide (SiC) power devices with outstanding advantages can be used to optimal design. This 8 kW LLC resonant converter prototype with silicon carbide (SiC) power devices with a modulated switching frequency ranges from 100  to 400 kHz. Findings The experimental results show that the topology, switching loss, rectifier loss, transformer loss and drive circuit of the full-bridge LLC silicon carbide (SiC) plasma power supply can be optimized. Research limitations/implications Due to the selected research object (plasma power supply), this study may have limited universality. The authors encourage the study of high frequency resonant converters for other applications such as argon arc welding. Practical implications This study provides a practical application for users to improve the quality of plasma welding. Originality/value The experimental results show that the full-bridge LLC silicon carbide (SiC) plasma power supply is preferred in operation under conditions of high frequency and high voltage. And its efficiency can reach 98%, making it lighter, more compact and more efficient than previous designs.

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