Lesson 3 Chapter Five
Analysis of Buck Converter (DC-DC) Circuit
Instructional Objectives
Study of the following in respect of the buck converter (dc-dc) circuit, with inductive (R-L) and battery (or back emf = E) load, assuming continuous conduction
• Derivation of the expressions for the maximum and minimum load currents
• Calculation of the following:
(a) the duty ratio for the limit for continuous conduction
(b) the average value and the ripple factor of the load current
(c) the harmonic components of the output voltage waveform
Introduction
In the last lesson , firstly the circuits of the various types of dc-dc converters (choppers), such as buck, boost and buck-boost, were presented. Then, the operation and the derivation of the expressions for the output voltage for the above dc-dc converters, including current waveforms, were described in detail. Lastly, the different control strategies used were briefly discussed.
In this lesson ? the second one in this module, the analysis of the buck converter (dc-dc) or step-down chopper circuit, using thyristor as a switching device, with inductive (R-L) and battery (or back emf = E) load, is presented in detail. Starting with the derivation of the expressions for the maximum and minimum load currents, assuming continuous conduction, the procedure for the calculation of following expressions ? the duty ratio for the limit of continuous conduction, the average value and the ripple factor, of the output (load) current, and the harmonic components of the output voltage waveform, are described in detail.
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