Questions tagged [buck-boost]
A non-isolated DC-DC converter topology
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MOSFET Driver, Synchronous Buck vs. Synchronous Boost
I am trying to understand the difference between synchronous buck MOSFET drivers and synchronous boost MOSFET drivers.
I have a full bridge converter which can also only be used as buck or boost.
I ...
2
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1
answer
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Determining the switching frequency of a buck-boost converter
I wanted to try to design a buck-boost converter (instead of buying it) to drive an electromagnet. I have a 12 V source and I want to have an output of 24 V and at least 200 mA. As input I'm using a ...
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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 ...
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1
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Bluetooth Speaker - Power Supply
I have some 10w 8ohm speakers. I'm building a bluetooth speaker set. I've hooked up a 3.7 volt 8,000mah portable charger battery to a XL6009 buck converter ( https://www.amazon.com/dp/B07NTXSJHB?psc=1&...
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Li-Ion Battery Array: V.out ≥ 3.5 [V], I.out ≤ 1 [A] : No voltage regulation? Boost? BuckBoost? SeriesxParallel — 1x4? 2x2?
With a lithium ion cell array as follows:
n.cell = 4.0 [-]
V.cell.max = 4.2 [V]
...
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1
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Separating 5v and 12v circuits using diodes, converters, and switches
I have drawn out a project with multiple power options.
I am wondering if any of these reverse current protection diodes can be left out.
If the double pole double throw switch can be replaced by a ...
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3
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DC-DC boost regulator selection question (TPS61230A) [closed]
I am a product designer self-learning electrical engineering, not an electrical engineer.
In trying to design a wearable device, I've run into some difficulty in selecting a DC-DC boost regulator.
The ...
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What role does the inductor and output capacitor play in a buck converter? [closed]
What role do inductors and capacitors play in buck converters?
I know it acts as an LC low-pass filter.
What other role does it have? When the switch opens, does the capacitor discharge in the load? ...
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1
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Why is my boost converter not working on breadboard but works in LTspice
Here is my diagram in LTspice.
And the wave should look like this in the simulation.
I have tried to use the same model for my spice simulation in order top make it as similar as my breadboard ...
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2
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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 ...
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Boost circuit for speaker
Years ago I build a mobile speaker with a battery inside but because of the battery dying, I decided to try to run it off USB power. The speaker is an old Creative T40 speaker and they run on 27 V so ...
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2
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Find inductor for XL6019 circuit boost converter
I need a way on my PCB to step up 5V to 12V (with currents up to 2A). I've been looking at the XL6019 IC and tried to copy the design from the sample circuit of the datasheet:
I'm currently stuck at ...
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Powering 12 V LED strips via a 3S lithium ion battery pack in a tight compartment
I am working on a project for an LED lamp. We are trying to power it via a 3S lithouk ion battery pack delivering up to 12.6 V with a cutoff voltage of 9 V. The brightness of the LEDs at 10.5 V is the ...
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Can I fix a buck converter which was plugged in the wrong way? XL6009 Module [closed]
I've plugged a buck/boost converter in the wrong way (+ to -) and it instantly stopped working. Does anyone know if there is a quick fix like exchanging a diode? Which components should I measure to ...
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2
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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. ...
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Simulink boost converter problem
I am working on a Boost converter model in Simulink for a school project.
The model should resemble charging a battery(18V) with a 12V DC voltage source and
a boost converter. With the internal ...
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1
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How do you drive the gate of a MOSFET in an inverting buck-boost converter?
I'm currently working on implementing a buck-boost converter for MPPT of a solar cell, the gate of the transistor is to be fed 0-3.3 V PWMlogic and I am planning on using a gate driver IC to combat ...
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Boost Converter doesn't work after simulation works fine
I designed a custom board and I just got it.
I checked the boost with Vin=14.4v( the operation required to be with battery)
Once the boost gets enabled, he is trying to take a current but in a strange ...
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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 ...
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Understanding average Iq of buck boost converter (skipping and switching modes)
I'm trying to pick a buck boost converter for a low power, small battery, long life device.
The datasheets specify different supply currents for different modes and I just can't wrap my head around ...
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1
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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 ...
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Use a MOSFET to switch a 25V power source between two loads with backflow protection
I would like to switch the output of a buck-boost converter (input) between a powerbank output (output1) and a charging circuit (output2). The buck-boost voltage output is between 5V and 28V. The ...
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54 V to 5 V using LM2576HV
I have a requirement to convert 54 V battery output to 5 V. My battery's positive terminal is grounded. I tried the connection as mentioned in the datasheet which is attached here, but as soon as I ...
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Boost converter vs. voltage regulator
I am trying to make a thermo-electric generator for a school project, and I need a voltage regulator to keep the USBA output at a constant 5 V. However, I have some step-up boost converter modules at ...
1
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1
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How to connect in serial two 2S Battery pack but charge them seperately?
I want to create a circuit that has input 12V DC and uses this voltage both charging two 2S (7.4V Li-Ion without balancing wire with BMS Circuit on the pack) batteries and at the same time supplying ...
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4
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How does a buck converter maximize the power in the MPPT system?
How can a DC-DC buck converter be used to maximize input power in an MPPT system? I know that an MPPT system consists of a processor that reads the power source and manages a buck converter to ...
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Modelling of a DC-DC Buck boost converter
I'm looking for some help with the following questions as not 100% where to start. I'm looking to derive the model for the averaged circuit of the buck-boost converter.
My understanding is that I ...
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Power MOSFETs used as a switch in DC/DC converter circuits in saturation region
So I have explored various high voltage DC/DC converter circuits. Consider a boost converter where you have a low side switch where entire load voltage appears across the switch which is MOSFET VDS ...
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2
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Do I need a buck or boost converter to charge a lithuim battery with solar and wind energy?
I am doing a school project in Matlab Simulink to design a battery charger.
I need to use solar and wind energy to charge the batteries. Since both solar and wind are not always constant voltage and ...
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Buck-Boost Converter Inductor Value
I am designing a typical buck-boost converter using the LTC3530EMS#PBF IC from Analog Devices.
My design specs are as follows:
Vin: 3.0V - 4.2V
Vout: 3.3V
Iout(max): 300mA
Fsw: 1MHz
In the datasheet, ...
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Ripple problem when using a type III Compensator for buck boost converter
I need your help, and from my last question here, I understand I need a closed-loop for my design, which helps to reduce the output overshooting. Below is the plot.
From the plot you can see my ...
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Automatic buck-boost DC-DC 1-15 V to 5 V, 5 A
I've a big 3000 F 6 x supercapacitors bank to work as an aux USB power hub. It gives power while linearly losing voltage to 5 V, then it stops working, because I'm using a 5-15 V to 5 V DC/DC ...
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9 V to 12 V step-up converter to drive load between 10-100 mA, and no load
I'm working on stepping up the voltage from a 9 V, 150 mA power supply to 12 V, with a load of 10-100 mA and moments where there's no load.
I have implemented something similar with this IC ...
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1
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Discrete high-side driver for GaNFET
Background:
I am designing a buck/boost converter to convert back and forth between my supply voltage of 3.6 V (battery) and an output voltage of VDD = 60 V to bidirectionally drive a capacitive ...
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2
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Why is my boost converter output lower than expected?
I have simulated this boost converter circuit in LTspice:
According to this calculator, I should be getting 140V output.
My output is only 115V. I suspect it's something to do with the MOSFET, but I ...
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Boost converter design issue
For a circuit I'm designing, I want to use an MC34063AL-D08-T DC/DC converter (or a similar one; I just need a through-hole package) as a boost converter to boost a voltage Vin = 3.3-4.2 V (coming ...
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Buck–boost converter on a lithium battery with a variable DC output
I have a battery with a DC port that is rated 9-12V 10A. I don't really know what that means. My guess is that the voltage of the DC port can go from 12V to 9V when the battery capacity is low.
I need ...
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0
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How to slowly store higher voltage from low power source?
I want to use a small solar panel (about 1V 15mA in ambient light) and then boost its voltage to 6V to slowly charge a 6V battery or capacitor. I have experimented with some generic boost converters, ...
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1
answer
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UC3843 voltage drop problem
I have assembled the following circuit.
In no-load mode and even up to 0.5 A current everything is fine, but when more load is placed on the circuit, the voltage drops to 2.5 V.
If I reduce the value ...
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Purpose of capacitors near the input of DC/DC boost converter
I recently bought this DC to DC boost converter (input from top; output from bottom). It has all the parts as a usual boost converter topology suggests: a mosfet, a diode, an inductor, and capacitors ...
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Using BC547 instead of S8050
I found this schematic on a website. This is a buck converter. They used S8050 as the gate drive transistor. Can I use BC547 instead of that?
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Small footprint AC to DC converter [closed]
I want to build a 3 kW AC to DC converter but the two-winding transformer is too big for my project. I want it to be small as possible. What are the possible options and their advantages and ...
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0
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Charging and discharging Li-ion cell dynamically
I intend to use an EBL 6F22 5400 mWh, 9 V Li-ion block as buffer for an USB-level solar charging station.
It comes with a micro-USB charging slot and necessary voltage regulation. Not much can be ...
2
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2
answers
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Which topology should I use for energy harvesting
I am making a energy harvester design but am confused which of the following circuit should I use to amplify and filter my harvested voltage. The first topology is the synchronous switch harvesting on ...
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Issue from my buck/boost converter
After my simulation, I am getting this in my output, which does not look good at all. I find it difficult to find a spice model for DC/DC isolator that can give me a positive, negative supply, and ...
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2
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2
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Boost battery voltage without regulating it
I'd like to boost the voltage of a lithium battery while having the converted voltage reflect the battery's state of charge (such that the output voltage equals the input voltage plus a set amount).
...
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protect from in rush current of buck convertor
I made a PCB base on the following schematic,
it uses a buck convertor for 12 to 5 v and then uses an LDO for 5 to 3.3 to run my ESP module
I use 2 P-channel MOSFET for polarity protection , but ...
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2
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Buck-boost converter (LTC3442) not producing output until excited
EDIT: Added datasheet for the inductor and some oscilloscope measurements.
I'm using a LTC3442 buck-boost converter from Linear Technology / Analog Devices (datasheet) in my design to produce a 3.3V ...
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4
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1
answer
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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)....
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