Power Electronics : Buck, Boost, and Buck Boost Converter Explained

Buck-Boost Converter Buck Converter Buck Converter Discussion    Texas Instruments IC packages such as the Buck ...


Buck-Boost Converter






Buck Converter


Buck Converter Discussion   


Texas Instruments IC packages such as the Buck converter IC package - LT1054IP




The buck converter is a step-down converter.

 While stepping up current from its input supply to its output (load), it steps down voltage. When I need to calculate the Basic Calculation of a Buck Converter's Power Stage TI buck converter I generally use these references:

This application report gives the formulas to calculate the power stage of a buck converter built with an integrated circuit having a integrated switch and operating in continuous conduction mode. It is not intended to give details on the functionality of a buck converter or how to compensate a converter.

AND THIS








Boost Converter
 Boost Converter Discussion

Here is a low voltage IC package




This converter steps up the voltage while stepping down the input current to the load

A boost converter (step-up converter) is a DC-to-DC power converter that steps up voltage (while stepping down current) from its input (supply) to its output (load). It is a class of switched-mode power supply (SMPS) containing a diode and a transistor and a capacitor, inductor, or the two in combination. To reduce voltage ripple, filters made of capacitors (sometimes in combination with inductors) are normally added to such a converter's output (load-side filter) and input (supply-side filter).

Buck-Boost Converter

Buck-Boost Converter






Buck-Boost Converter Discussion  




A Buck-Boost converter is combines the  Buck Converter and the Boost converter in a single circuit. Like other Switch Mode Power Supply (SMPS) designs, it provides a regulated DC output voltage from either an AC or a DC input.

Design Calculations for Buck-Boost Converters - Calculating the Duty Cycle




In-Rush current-

Upon system startup, the power supply will ramp up to the regulated voltage. As the voltage increases, an inrush of current flows into the uncharged capacitors. Inrush current can also be generated when a capacitive load is switched onto a power rail and must be charged to that voltage level.

This is a great resource.

TI - Managing In-Rush Current
 

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