scholarly journals Robust Output Voltage Regulation for DC–DC Buck Converters Under Load Variations via Sampled-Data Sensorless Control

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 10688-10698 ◽  
Author(s):  
Pengfei Song ◽  
Chenggang Cui ◽  
Yanlong Bai
Keyword(s):  
Output Voltage ◽  
Sensorless Control ◽  
Voltage Regulation ◽  
Buck Converters ◽  
Sampled Data ◽  
Load Variations

Analysis of Integrated Current Sense in Multiphase Buck Converters

2015 ◽  
Author(s):  
Ian Kearney
Keyword(s):  
Output Voltage ◽  
High Performance ◽  
Supply Voltage ◽  
Voltage Regulation ◽  
Buck Converters ◽  
Current Sensing ◽  
Power Mosfets ◽  
Root Cause ◽  
Internal Gain ◽  
Alternative Topology

Abstract Accurate and lossless current sensing is vital for high performance multiphase buck converters used in the latest voltage regulation modules (VRMs). A synchronous FET onstate resistance based approach is an alternative topology to DCR based sensing and is compatible with any controller, which requires inductor current information. The MOSFET driver has built-in sense circuitry, which when co-packaged with the MOSFETs reduces total footprint and ease of design. The Powerstage embodiment virtually eliminates the parasitic inductance and resistance between Control and Synchronous power MOSFETS; and using thick copper clips substantially reduce the parasitics associated with the input supply voltage (VIN) and the switch node output voltage (VSW) connections when compared to wire-bonded solutions. This paper presents a novel investigation into a contradictory low on-resistance paradox in a stacked 3D configuration. Through analysis, characterization and simulation the author deciphered the conundrum leading to a root cause explained by a mismatch of internal gain and referenced on-resistance. Building on previous metrology improvements the innovative insights drove analysis toward root-cause.

scholarly journals Design a Digital Electronic Load Controller for Micro-Hydroelectric System Applications

2020 ◽  
Vol 9 (3) ◽  
pp. 3323-3328
Keyword(s):  
Output Voltage ◽  
Cost Effective ◽  
Voltage Regulation ◽  
Time Interval ◽  
Load Variations ◽  
Laboratory Setup ◽  
Documented Information ◽  
Nominal Voltage ◽  
Small Change ◽  
Electronic Load

A micro-hydroelectric system is an important alternative for rural electrification, but its output voltage fluctuates over a small change of consumer loads. In order to protect the users and their appliances, the output voltage must be regulated to the nominal voltage of the appliances. For that purpose, this paper describes the concept of a simple and cost effective digital Electronic Load Controller (ELC). The formulation of proportional-integral-derivative (PID) control based ELC algorithm is presented, and the flow chart of the algorithm is derived. The hardware implementation of the ELC was established to verify the concept. By using a laboratory setup, the tuning effect of PID time interval on the voltage regulation was investigated and presented as there is no well documented information about the setting of that variable in literature. The experimental results showed that the ELC performed better with minimum value of time interval. The ELC was also tested with load variations, and the results showed that the output voltage was kept regulated at the nominal voltage despite the load variations. This has confirmed that the concept and methods used in the ELC design proposed in this paper can be considered for the voltage regulation of the microhydroelectric system.

scholarly journals Controlling of DC-DC Buck Converters Using Microcontrollers

2021 ◽  
Vol 15 ◽  
pp. 197-202
Author(s):  
Mohammed O. Alsumady ◽  
Yazan K. Alturk ◽  
Ahmad Dagamseh ◽  
Ma'moun Tantawi
Keyword(s):  
Output Voltage ◽  
High Efficiency ◽  
Voltage Regulation ◽  
Buck Converter ◽  
Buck Converters ◽  
Voltage Variation ◽  
Digital Potentiometer ◽  
Digitally Controlled ◽  
Load Regulation ◽  
Source Voltage

This paper presents a technique to digitally control the output voltage of a DC-DC converter via a microcontroller. The voltage regulation and controlling were achieved utilizing an LM2596 buck converter. A digital potentiometer MCP41050 is utilized to smoothly control the regulated output DC voltage via the SPI digital protocol. The proposed design is manufactured and tested for various loads. This device is considered as a step-down voltage regulator capable of driving 3A load with high efficiency, excellent linearity, source-voltage variation, and load regulation. The results show that the system can control the output voltage with satisfactory performance and high accuracy. With various loads, the proposed system shows a mean square error of 0.015±0.037 volts tested with a regulated voltage of 5 volts. The efficiency improves from about 80% to around 91% at a 1 kΩ load. This design eliminates the possible errors that arise when manually varying the voltage of the buck converter; by means of using a microcontroller. Such a system ensures a proper digitally controlled output voltage with a better performance, which can be applied in various applications.

scholarly journals Analysis and Design for Output Voltage Regulation in Constant-on-Time-Controlled Fly-Buck Converter

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 1886
Author(s):  
Younghoon Cho ◽  
Paul Jang
Keyword(s):  
Output Voltage ◽  
Voltage Regulation ◽  
Design Guidelines ◽  
Buck Converter ◽  
Design Guideline ◽  
Analysis And Design ◽  
Flyback Converter ◽  
Auxiliary Power ◽  
Primary Output ◽  
Output Capacitor

Fly-buck converter is a multi-output converter with the structure of a synchronous buck converter structure on the primary side and a flyback converter structure on the secondary side, and can be utilized in various applications due to its many advantages. In terms of control, the primary side of the fly-buck converter has the same structure as a synchronous buck converter, allowing the constant-on-time (COT) control to be applied to the fly-buck converter. However, due to the inherent energy transfer principle, the primary-side output voltage regulation of COT controlled fly-buck converters may be poor, which can deteriorate the overall converter performance. Therefore, the primary output capacitor must be carefully designed to improve the voltage regulation characteristics. In this paper, a theoretical analysis of the output voltage regulation in COT controlled fly-buck converter is conducted, and based on this, a design guideline for the primary output capacitor considering the output voltage regulation is presented. The validity of the analysis and design guidelines was verified using a 5 W prototype of the COT controlled fly-buck converter for telecommunication auxiliary power supply.

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