Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [buck-boost]

A non-isolated DC-DC converter topology

291 questions
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Why are boost/buck converters never fully integrated/all-in-one?

Moving from small arduino applications to higher-power applications for work, I've had to switch from using simple linear regulators to switching boost/buck converters any time a different voltage to what is available is required. This has been much…
Isaac Middlemiss
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1 answer

Why is buck-boost efficiency not specified for ultra light loads (μA)?

When browsing for buck-boost converters I've looked at many datasheets and I've made an observation that I'd like to question. I have a low-power application and energy consumption is one of my primary concerns. The converters specify efficiency…
Alexander Ohm
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1 answer

Is it possible to get a high efficiency buck-boost converter by switching between the two?

Many buck-boost converters work by boosting to an intermediate voltage, then bucking to the desired voltage. What if instead, it had a separate buck and boost section in parallel, and switched between the two based on input voltage and desired…
Daffy
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6
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2 answers

How to prevent "Def Con" and simulation running at femtoseconds / second (running forever) for 1,600-run simulation

I did read other questions related to "Def Con", but, 1. I did not understand very well what was said, 2. other circuits were not discrete transistor circuits, and 3. I thought that it might be useful to have a minimal circuit with this problem, in…
MicroservicesOnDDD
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5
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2 answers

Idea behind current mode control in DC-DC converter

I am learning about control strategies for DC-DC converters. While I find voltage mode control easy to understand, I struggle to understand current mode control. Is the idea here to control the output voltage by controlling the inductor current? If…
hakam zoubi
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2 answers

Power electronics DC DC converter question: What is the function of the capacitor and resistor connected between two series inductors?

This is a power electronics DC DC converter question: What is the function of the capacitor and resistor connected between two series inductors? This is part of the schematic from a photovoltaic inverter. I coudn't understand the function of the…
Power_Electronics
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Why is buck-boost converter showing a different trend than buck and boost in efficiency peaking point?

In general I was under the impression, the efficiency is highest when input and output voltage are close to each other. This holds good for boost (text book image below) and buck (personal experience). The below graph represents the plot of both…
Divya K.S
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1 answer

DC-DC Converter - Why is the input voltage called Vg?

In the textbook I'm reading (Fundamentals of Power Electronics 2nd Ed, Erickson and Maksimovic), the input voltage for several different types of converter circuits is labeled Vg. The textbook gives no explanation for what the g refers to. Does…
Evan Cox
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4
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2 answers

How to pick a capacitor to adjust loop compensation caused by reactive load?

I do wish to add a voltage regulator between a Li-Ion battery pack and a 36V 220W rated mid drive pedalling assist motor with integrated controller. The caps of that controller have a 63V rating. That pedal-assist motor has an unloaded current draw…
Pro Backup
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2 answers

Supercapacitor to prevent temporary power supply voids

Hello and sorry for the improper title! We need to transmit about 50 W (5 V 10 A) through a slip-ring-ish to drive some rotating electronics and LEDs. We are using a 5 V 25 A LED power supply. We are worried about the slip ring temporary losing…
Suxsem
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High-power, high-efficiency boost converter design

I have a task of creating a boost DC-DC converter that can convert 3-4 V input into 12-16 V output with 100 W power and high efficiency. There is nothing similar that I could find on the internet. Could someone give pointers to such designs or ICs?
Isso
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Will this charge pump work?

I am trying to make a charge pump for a project of mine. I'll be using some spare transistors I salvaged from an old tube TV and I intend to use the increased voltage for a high-side gate driver for an N-MOSFET which I salvaged from the same…
kale hops
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Why is the current linear in a boost converter? Why doesn't the capacitor make it sinusoidal?

I understand that the voltage across the inductor is constant so the current will be linear, but what about the capacitor in the circuit(Sw off state)? Will it not affect the current waveform? I think in DC transient response of an LC circuit we get…
Gaurav Av
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A voltage controlled switch for a single NiMH cell

I'm developing a small project that contains one AAA NiMH battery that is charged via USB with a MAX DS2711 IC. The output of the battery is connected to a TPS61006 to boost the ~0.9 - 1.3v cell voltage to a 3.3 usable output. The problem is that…
justynnuff
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3
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One step-down regulator 24 V to 1V or two step-down regulators with lower steps?

I am trying to design a working principle scheme to step-down the input voltage from 24Vdc ---> different low voltages (1.8 V, 1 V, 1.5 V, 3.3 V with ripples ~ 1%). Could you kindly explain me the the pro and cons of considering a single step-down…
g.mezzina23
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