Markov Chain Modeling for Reliability Analysis of Multi-Phase Buck Converters

2019 ◽  
Vol 29 (09) ◽  
pp. 2050139 ◽  
Author(s):  
Elias Shokati Asl ◽  
Mehran Sabahi ◽  
Mehdi Abapour ◽  
Alireza Eyvazizadeh Khosroshahi ◽  
Hossein Khoun-Jahan
Keyword(s):  
Electromagnetic Interference ◽  
Buck Converter ◽  
Buck Converters ◽  
Time To Failure ◽  
Output Current ◽  
Fast Transient Response ◽  
Comprehensive Comparison ◽  
Multi Phase ◽  
Mean Time ◽  
Current Ripple

In recent years, the structure of multi-phase buck converter also called Interleaved Buck Converter (IBC) has gained considerable attention. The advantages of the IBC in comparison to the conventional Buck converter (CBC) are the lower output current ripple, higher efficiency, fast transient response, lower electromagnetic interference and higher reliability. Since more than one stage is employed in the IBC, this converter is highly reliable. In this paper, the reliability and mean time to failure (MTTF) of the CBC, and two- and three-stage IBCs are figured out. Using the obtained results and considering various scenarios, a comprehensive comparison is provided. In addition, the operation of the converter in case of fault occurrence for high and low capacities is analyzed and reliability is evaluated in each state. The relation between the reliability and temperature of semiconductor elements is discussed. Furthermore, a laboratory-scaled prototype is used to extract the experimental results of the temperature variation of the elements during a fault. Markov model is used to evaluate the analyzed reliability.

scholarly journals Stacked Buck Converter: Current Ripple Elimination Effect and Transient Response

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 64
Author(s):  
Chien-Chun Huang ◽  
Yu-Chen Liu ◽  
Chia-Ching Lin ◽  
Chih-Yu Ni ◽  
Huang-Jen Chiu
Keyword(s):  
Transient Response ◽  
Dead Time ◽  
Control Method ◽  
Buck Converter ◽  
Modulation Method ◽  
Output Current ◽  
Time Modulation ◽  
Advantages And Disadvantages ◽  
Improvement Method ◽  
Current Ripple

To balance the cost and volume when applying a low output current ripple, the power supply design should be able to eliminate the current ripple under any duty cycle in medium and high switching frequencies, and considerably reduce filter volume to improve power density. A stacked buck converter was eventually selected after reviewing the existing solutions and discussing their advantages and disadvantages. A stacked buck converter is used as a basis to propose the transient response and output current ripple elimination effect, boundary limit control method, and low output ripple dead time modulation method to make individual improvements. The principle, mathematical derivation, small-signal model, and compensator design method of the improvement method are presented in detail. Moreover, simulation results are used to mutually verify the correctness and effectiveness of the improvement method. A stacked buck converter with 330-V input, 50-V output, and 1-kW output power was implemented to verify the effect of the low output current ripple dead time modulation. Experimental results showed that the peak-to-peak value of the output current ripple was reduced from 2.09 A to 559 mA, and the RMS value was reduced from 551 mA to 91 mA, thereby effectively improving the output current ripple.

Controller for a reduced output current ripple DC-DC buck converter

2015 ◽  
Author(s):  
Jose M. Sosa ◽  
P.R. Martinez-Rodriguez ◽  
G. Escobar ◽  
J.C. Nava-Cruz ◽  
C.A. Limones-Pozos
Keyword(s):  
Buck Converter ◽  
Output Current ◽  
Current Ripple

Reduced output current ripple DC-DC buck converter control

2016 ◽  
Author(s):  
Jose M. Sosa ◽  
P. R. Martinez-Rodriguez ◽  
G. Escobar ◽  
G. Vazquez ◽  
J. C. Nava-Cruz
Keyword(s):  
Buck Converter ◽  
Output Current ◽  
Current Ripple

scholarly journals Parametric Analysis of Automotive Grade Buck Converters

2021 ◽  
Vol 23 (06) ◽  
pp. 395-401
Author(s):  
Vajra R Singh ◽  
◽  
Sindhu Rajendran ◽  
Keyword(s):  
Power Systems ◽  
Parametric Analysis ◽  
Input Voltage ◽  
Buck Converter ◽  
Buck Converters ◽  
Output Current ◽  
System A ◽  
Constant Output ◽  
Design Characteristics ◽  
Lower Voltage

The current power system design in electric automobiles has become increasingly complicated due to innumerable electronics which are required to be integrated for the effective functioning of the system. A DC/DC buck converter is primarily used in order to control and regulate the working of peripheral systems in an automotive, the voltage from the battery is stepped down in order to power systems like the USB ports and the dashboard interfaces. There are multiple regulators available but in order to assess the feasibility of the available IC’s to the interface, the design characteristics and specifications require stepping down the input voltage from a higher voltage to produce a requirement specific lower voltage and constant output current in amperes. A comprehensive parametric analysis of LM23625 and LM23630 is performed by simulating buck regulators operating at respective switching frequencies.

scholarly journals Fuzzy-Logic-Based Mean Time to Failure (MTTF) Analysis of Interleaved Dc-Dc Converters Equipped with Redundant-Switch Configuration

2018 ◽  
Vol 9 (1) ◽  
pp. 88 ◽  
Author(s):  
Tohid Rahimi ◽  
Hossein Jahan ◽  
Frede Blaabjerg ◽  
Amir Bahman ◽  
Seyed Hosseini
Keyword(s):  
Fuzzy Logic ◽  
Markov Models ◽  
Reliability Function ◽  
Time To Failure ◽  
Failure Rates ◽  
Mean Time To Failure ◽  
Passive Components ◽  
Multi Phase ◽  
First Time ◽  
Mean Time

Interleaved dc-dc converters in sensitive applications necessitate an enhanced reliability. An interleaved converter equipped with redundant components can fulfill the reliability requirements. Mean Time to Failure (MTTF), as a reliability index, can be used to evaluate the expected life span of the mentioned converters. The Markov model is a helpful tool to calculate the MTTF in such systems. Different scientific reports denote different failure rates with different weight for power elements. Also, in reliability reports, failure rates of active and passive components are uncertain values. In order to approximate the failure rates fuzzy-logic-based Markov models are proposed in this paper. Then it is used to evaluate the MTTF of an interleaved multi-phase dc-dc converter, which is equipped with parallel and standby switch configurations. For the first time, fuzzy curves for MTTFs of the converters and 3D reliability function are derived in this paper. The reliability analyses give an insight to find the appropriate redundant-switch configurations for interleaved dc-dc converters under different conditions. Simulation and experimental results are provided to lend credence to the viability of the studied redundant-switch configurations in interleaved dc-dc boost converter.

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