Efficient Control of SEPIC DC-DC Converter with Dynamic Switching Frequency

2018 ◽  
pp. 96-101
Author(s):  
Samuel Žák ◽  
Peter Ševčík ◽  
Martin Revák
Keyword(s):  
Switching Frequency ◽  
Dynamic Switching ◽  
Efficient Control

Scheduling overcommitted VM: Behavior monitoring and dynamic switching-frequency scaling

2013 ◽  
Vol 29 (1) ◽  
pp. 341-351 ◽  
Author(s):  
Huacai Chen ◽  
Hai Jin ◽  
Kan Hu ◽  
Jian Huang
Keyword(s):  
Switching Frequency ◽  
Frequency Scaling ◽  
Dynamic Switching ◽  
Behavior Monitoring

scholarly journals A Switching Strategy of CHB Inverter for PV System Under Nonuniform Illuminating Conditions

2020 ◽  
Vol 12 (4) ◽  
pp. 1047-1065
Author(s):  
Hadi Suhana Suhana ◽  
◽  
Ngapuli Irmea Sinisuka ◽  
Muhammad Nurdin ◽  
Yvon Besanger ◽  
...  
Keyword(s):  
Switching Frequency ◽  
Pv System ◽  
Switching Strategy ◽  
Dynamic Switching ◽  
Switching Pattern ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Field Programmable ◽  
Power Generation Systems ◽  
Pv Power Generation

This paper proposes a switching strategy for Cascaded H-bridge (CHB) multilevel inverter for photo voltaic (PV) power generation systems under nonuniform illuminating conditions. In order to minimize the switching frequency, selective harmonic elimination (SHE) technique is used to determine the inverter switching pattern. As the DC voltages are unbalanced and vary from time to time, the switching pattern has to change dynamically. How to implement the dynamic switching pattern by using a field programmable gate array (FPGA) is described in this paper. Several simulated and experimental results are included in this paper to show the effectiveness of the proposed method.

Comparison of Dc-Dc SEPIC, CUK and Flyback Converters Based LED Drivers

2020 ◽  
pp. 99-107
Author(s):  
Erdal Sehirli
Keyword(s):  
Integrated Circuit ◽  
Closed Loop ◽  
Input Voltage ◽  
Open Loop ◽  
Current Sensor ◽  
Switching Frequency ◽  
Led Driver ◽  
Advantages And Disadvantages ◽  
Led Drivers ◽  
Conduction Mode

This paper presents the comparison of LED driver topologies that include SEPIC, CUK and FLYBACK DC-DC converters. Both topologies are designed for 8W power and operated in discontinuous conduction mode (DCM) with 88 kHz switching frequency. Furthermore, inductors of SEPIC and CUK converters are wounded as coupled. Applications are realized by using SG3524 integrated circuit for open loop and PIC16F877 microcontroller for closed loop. Besides, ACS712 current sensor used to limit maximum LED current for closed loop applications. Finally, SEPIC, CUK and FLYBACK DC-DC LED drivers are compared with respect to LED current, LED voltage, input voltage and current. Also, advantages and disadvantages of all topologies are concluded.

MSHE-PWM Control of Modular Multilevel Direct Current Transmission System

2015 ◽  
Vol 9 (1) ◽  
pp. 553-559
Author(s):  
HU Xin-xin ◽  
Chen Chun-lan
Keyword(s):  
Pulse Width Modulation ◽  
Reactive Power ◽  
Balance Control ◽  
Electric Energy ◽  
Access Point ◽  
Experimental Result ◽  
Switching Frequency ◽  
Pwm Control ◽  
Harmonic Elimination

In order to optimize the electric energy quality of HVDC access point, a modular multilevel selective harmonic elimination pulse-width modulation (MSHE-PWM) method is proposed. On the basis of keeping the minimum action frequency of the power device, MSHE-PWM method can meet the requirement for accurately eliminating low-order harmonics in the output PWM waveform. Firstly, establish the basic mathematical model of MMC topology and point out the voltage balance control principle of single modules; then, analyze offline gaining principle and realization way of MSHEPWM switching angle; finally, verify MSHE-PWM control performance on the basis of MMC reactive power compensation experimental prototype. The experimental result shows that the proposed MSHE-PWM method can meet such performance indexes as low switching frequency and no lower-order harmonics, and has verified the feasibility and effectiveness thereof for optimizing the electric energy quality of HVDC access point.

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