Buck Converter with a Variable Number of Predictive Current Distributing Method

T  Saravanan     and G  Saritha

doi:10.17485/ijst/2013/v6isp5.5

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Buck Converter with a Variable Number of Predictive Current Distributing Method

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Indian Journal of Science and Technology

DOI: 10.17485/ijst/2013/v6isp5.5

Year: 2013, Volume: 6, Issue: Supplementary 5, Pages: 1-6

Original Article

Buck Converter with a Variable Number of Predictive Current Distributing Method

T. Saravanan^1∗ and G. Saritha²

¹Professor, Bharath University, [email protected]
²Associate Professor, Sri Sairam Institute of Technology; [email protected]
*Author For Correspondence
T. Saravanan
Professor, Bharath University,
Email:[email protected]

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

This paper reports that the converter efficiency can be achieved by dynamically changing the number of active phases depending on the load. We provide solution related to the transient response of the converter when the number of active phases is changed. The problem arises because the current in the individual phases of the interleaved Buck converter will not be equal immediately after the controller has changed the number of active phases. The current equalisation scheme relies on the measurement of the output current and the knowledge of a few converter parameters and it does not require a measurement of the current in each phase. A digital PWM modulator has been designed that allows the current equalisation scheme to work. Simulations and measurements for a four phase interleaved Buck converter are presented in this paper.
Keywords: PWM-Pulse Width Modulation, PID-Proportional Integral Derivative, ADC-Analog to Digital Converter, MOSFET-Metal Oxide Semi Conductor Field Effect Transistor.