Analyzing The Effect of Voltage Drops On The DC Transfer Function Of The Buck Converter

Focus:

Switching converters combine passive elements such as resistors, inductors, capacitors but also active devices like power switches. When you study a power converter most of these components are considered ideal: when switches close they do not drop voltage across their terminals, inductors do not feature ohmic losses and so on. In reality, all these elements, either passive or active, are far from being perfect. This article studies the effects of various voltage drops on the dc transfer function of a buck converter operated in continuous conduction mode. It also applies this analysis to a forward converter, which is a buck-derived topology. When the voltage drops and parasitics are included in the models, it is seen the duty cycle increases from that of the ideal state. Results are verified with simulation of popular application examples and implications for converter design are discussed.

What you’ll learn:

• How to model the effects of various voltage drops on the dc transfer function of a buck converter operated in CCM

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Author & Publication:

Christophe Basso, ON Semiconductor, Toulouse, France, How2Power Today, May 15 2018

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