Basic Power Supply Thesis

Basic Power Supply Thesis-76
For example, if a DC source, an inductor, a switch, and the corresponding electrical ground are placed in series and the switch is driven by a square wave, the peak-to-peak voltage of the waveform measured across the switch can exceed the input voltage from the DC source.This is because the inductor responds to changes in current by inducing its own voltage to counter the change in current, and this voltage adds to the source voltage while the switch is open.1.- To study the nowadays solutions for high power and high output voltage converters, and compare them with the performances of the PRC-LCC resonant converter with a capacitor as output filter.

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A linear regulator regulates either output voltage or current by dissipating the excess electric power in the form of heat, and hence its maximum power efficiency is voltage-out/voltage-in since the volt difference is wasted.

In contrast, a SMPS changes output voltage and current by switching ideally lossless storage elements, such as inductors and capacitors, between different electrical configurations.

Ideal switching elements (approximated by transistors operated outside of their active mode) have no resistance when "on" and carry no current when "off", and so converters with ideal components would operate with 100% efficiency (i.e., all input power is delivered to the load; no power is wasted as dissipated heat).

In reality, these ideal components do not exist, so a switching power supply cannot be 100% efficient, but it is still a significant improvement in efficiency over a linear regulator.A switched-mode power supply (switching-mode power supply, switch-mode power supply, switched power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently.Like other power supplies, an SMPS transfers power from a DC or AC source (often mains power) to DC loads, such as a personal computer, while converting voltage and current characteristics.Voltage regulation is achieved by varying the ratio of on-to-off time (also known as duty cycles).In contrast, a linear power supply regulates the output voltage by continually dissipating power in the pass transistor.This higher power conversion efficiency is an important advantage of a switched-mode power supply.Switched-mode power supplies may also be substantially smaller and lighter than a linear supply due to the smaller transformer size and weight.This model will be formulated in its large signal appearance, and experimentally verified.3.- To deduce from the large signal model a new and more simple steady state solution.4.- To approximate the large signal model for a lineal one, obtaining, this way, a small signal model for the topology.5.- To particularise the three previous models for the optimum switching area defined in the objective 1.

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