Questions tagged [buck-boost]

A non-isolated DC-DC converter topology

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42 views

Boosting 3.0 - 4.6 Volts to 5V

I found this circuit that will auto switch between power between USB (5V) or a LiPo Battery (3.0V - 4.2V range). The schottky diode, D4, can have a voltage drop of about 0.4V which is too high for me....
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75 views

Buck-Boost Converter Modeling

I wanted to perform AC analysis for a buck boost converter using SIMetrix/SIMPLIS for simulation, using this simulator the designer does not need to the average model to get the frequency response of ...
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2answers
57 views

Boost Voltage from 5V to 19.1 V

Long story short, I have a Toshiba laptop. Its adapter outputs 19.05 volt and 3A. I wanted to build a powerbank for my laptop. I have built one using Li-ion cells. 5 cells in series with each cell as ...
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1answer
51 views

Difference between placing unidirectional TVS diode before fuse or after P mosfet

In the buck-boost converter I am finishing, I came out with this question. At Vin (12V in my circuit) I place a 7A fuse and a P mosfet (IRF5305) to prevent reverse polarity issues. Because I want to ...
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1answer
25 views

Issue with my solar charger using LM2596

I am using a 20W solar panel, maximum voltage 21V & maximum current 1.23 A. I am using LM2596 to dtep-down to 5V to charge my powerbank, hich will later power my Nodemcu (ESP8266 board.) Issue in ...
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1answer
73 views

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 ...
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23 views

Dutycycle DCDC control

I will start with that, i already ask for this question in other topic but i didn't have any anwser about my question link. Please don't go too far in explaning difficult thing not realated with my ...
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2answers
78 views

Voltage Mode Control

Since i started my training about design of DCDC I'm really confuse with control part. At school i learned that DutyDycle=Vout/Vin for Buck, and that's it. But now, i see that, Duty cycle is set ...
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33 views

Why does my input current inverter is high?

I have a problem with input current in my inverter is high. My inverter will use for solar panel and using boost converter to convert dc voltage 12-18 Volt to 24 volt. I'm using P channel mosfet ...
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1answer
27 views

boost converter minimum input current

i have 15V to 30V 30A boost converter, what is the minimum input current should i supply to get 30A at ouput? (my device consume about 30A) does it 30A?
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32 views

Buck-Boost Waveforms

I run a DC analysis of a buck-boost converter to generate the steady state waveforms of different currents and voltages. I am interested in the inductor current and voltage and capacitor current. The ...
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40 views

DIY 3 V -16 V, 300 watt boost converter for ultracapacitors

I am trying to build a power supply for a portable Tesla coil project using 6 × 3000 farad supercapacitors in series (16.2 V @ 500 F). I am trying to maximize the usability of the supercapacitor ...
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1answer
54 views

How to Wire DC Motor to Solar Panel and Battery to Only turn on at Night?

I have tried looking this up on google but can only come across ones that have the motor running all the time from the solar panel and battery, where I need it to run only at night. So anyways, my dad ...
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1answer
64 views

Routing traces of different width onto an IC on a 4-layer PCB in Eagle

I am finishing my design of my buck/boost converter using LTC3780 IC on a 4-layer PCB. Those 1mm blue width traces will carry 2-3 amps. I need a way to connect those traces of the same layer (blue) ...
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2answers
29 views

Problem with LTC3872 Voltage Converter. Simulated results not matching with information provided in the datasheet

I'm trying to make a boost converter that takes an input of 3.7V and outputs 5V. I found a chip that I think will work well, the LTC3872 by Linear Technology. In the datasheet they give an example ...
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3answers
86 views

How to digitally control a MOSFET? [closed]

I'm trying to make a temperature controller for peltier module using MOSFET. The peltier uses 3.3 to 12 volts and 15A. So far I've only come across a way in which the circuit uses a potentiometer at ...
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49 views

Designing a Buck Boost Regulator 12V Circuit

I have been trying to source a Buck/Boost IC to design a circuit for my needs but I'm having a little trouble understanding how I would do this. I am currently designing a circuit that will provide a ...
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3answers
60 views

Choice of buck-boost converter

I have a Li-Po battery which has a discharge voltage range of (2.5-4.2)V and I want a regulator which is able to convert this voltage to 3.3V. I was told to use a buck boost converter. I have found ...
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64 views

Windmill 3 Phase AC control PCB

I've created a PCB for my newly built 3D printed Windmill. Now I am not entirely sure about all the components and the way they function, so I'd like to have your opinion on the circuitry before I ...
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113 views

Optimizations for LM2596, Positive and Negative Voltage

I'm working with the LM2596 to get a positive and negative voltage using two separate IC for each. I'm having trouble optimizing them for a 1 A load. I followed along with TI's WEBBENCH designer to ...
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1answer
63 views

Buck Converter Voltage Fluctuation [closed]

Why the Voltage in output of Buck Converter fluctuates when there is a step change in load?
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77 views

Schematic Explanation [closed]

Could someone please explain to me in as much detail as possible the schematic below. I'm really confused and would appreciate someone walking me through this. What is the Rationale of connecting the ...
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4answers
180 views

Adding to the output of a DC/DC Boost Converter using the same power supply as the input?

I've got a project that requires a variable output between 24-48V. This needs to be continuous-current, not PWM. Items that I have handy from my 'box of bits', and ready to work with are: an 0.6-36V ...
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1answer
158 views

How do I simulate this unconventional Joule Thief?

Here is a transistor-based simulation of the manually-commutated switched-capacitor SMPS circuit discussed at the bottom of this question, that helps me to think and verify the performance of this ...
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2answers
601 views

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 ...
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1answer
66 views

Boosting 18 V drill battery to 60 V to power LED lights, problems with voltage stability

I have a bunch of Dewalt 18 V batteries and 2 LED shop lights that I converted to DC, specifically 60 V, 1.5 amps per strip. I have had mixed luck and I am looking for a better approach. I have no ...
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25 views

Accentuated output current ripple in parallel dc-dc converters

I'm building a simulation model in SIMULINK consisting of three parallel bidirectional buck-boost converters feeding a resistive load. Each converter is equipped with cascade voltage and current ...
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2answers
101 views

Is a 24V-48V 40A boost converter possible?

I would like to produce a buck/boost converter that can convert 24V to 48V with a 40A max. output current. It would be used to control a DC motor, specifically the MY1016Z3 DC motor. I cannot use a ...
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1answer
527 views

Connect two mobile power banks in series

I have two 20.000 mAh mobile power banks with two USB ports that can deliver 5V at 2.4A. I need a minimum of 9V at 2A in output. I have 2 male USB connector cables and I want to connect the negative ...
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2answers
46 views

Through hole buck-boost ic [closed]

I'm looking to create my own buck-boost converter but want to test it on a breadboard. I have done online searches but only surface mounted ICs show up. The Texas instruments TPS63061 looks ideal for ...
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1answer
45 views

State-Space-Model from more dimensional Transfer-Function

Im trying to extract the State-Space-Model for an cascaded Buck/Boost-Converter from an set of Transfer-functions \$ G(s)\$ (which I generated with Plecs/Matlab). First of all I want to analyse the ...
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2answers
169 views

How might I increase incircuit voltage from 2.5 DCV to 3 DCV

I'll cut to the chase, an about me is at the bottom of this post... I have a standard NE555P fader circuit powered via a 1.2V battery boosted by a QX5252 with 220µH axial inductor (which according to ...
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33 views

solar PV bypass diode v buck boost v SSR

I have 20 185W panels in two strings each to a ginlong GCI-2k inverter. The panels are W facing 45deg, between two pitches with some chimneys. The prediction for latitude and moderate shading is ...
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52 views

Boost converter voltage drop

I used both the TPS610986 and TPS61291 boost converter in order to power a load that consumes around 200mA in both situations (TPS610986 powering the load then use the TPS61291 to power the same load)....
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2answers
153 views

Diode selection for step-down Converter

I have built quite some buck converters for ~3A@3-5V (~1MHz, 24V Input) and I always used schottky diodes due to their low forward voltage drop (and therefore low power dissipation during free ...
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37 views

Can't find definitions of model irfs4010

I'm trying to run on the LTSpice the circuit below. It's the circuit of a Boost-Converter. When I try to run, LTSpice shows the message "M1: Can't find definition of model irfs4010". Sorry if i'm not ...
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1answer
60 views

How to generate positive and negative power supplies from a single supply with high current driving capability?

I am trying to build a 1553 military standard bus transceiver (analog front end) and I am required to use a single power supply of 3.3 V. To be able to receive, my comparators need supplies of +/- 3.3-...
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2answers
89 views

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 ...
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2answers
217 views

What the difference between a buck-boost converter and buck-boost controller?

I was looking for some buck boost power management IC for my circuit i have noticed that in Texas instruments website the buck - boost is categorized into 2 category converter and controller googling ...
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56 views

Design power bank with BQ24195

I want to design a power bank control board for a single-cell lipo battery. The IC I have selected is BQ24195 by Texas Instruments - datasheet here. I think it is perfect for what I need. It comes ...
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3answers
1k views

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 ...
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1answer
51 views

Could you power a complete circuit using a Dc-Dc boost inverting IC?

I was making a circuit, and i was limited to using one Dc-Dc boost inverting IC, with a power supply of 3.8V. I used the Dc-Dc to make -5V on its output, and (if i change the polarity of its output) i ...
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2answers
104 views

PWM-Switch Model of a Cascaded-Buck-Boost

Im trying to develop the PWM-Switch Model of a Cascaded-Buck-Boost. First of all i want to extract the Large-Signal Transfer function for the Buck-Mode. I'm working through the book "Switch-Mode ...
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62 views

Modelling DC/DC-Converter

i want to model a cascaded Buck/Boost-Converter with FAST like mentioned here: https://cbasso.pagesperso-orange.fr/Downloads/PPTs/Chris%20Basso%20APEC%20seminar%202013.pdf. The goal is to implement a ...
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102 views

State-Space Model of a Buck-Converter in DCM

I have a problem getting the State-Space Representation of an Buck-Converter in DCM. There are 2-Switch Cycles between one Period. If the Switch is closed the Circuit looks like: after applying ...
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50 views

Parallel LTC3127 based software controlled supercapacitor charger

I am trying to charge 3 supercapacitors rated for 2.7VDC-300F connected in parallel, giving a total of 900F@2.7V. The IC I am trying to use is the LTC3127 from Analog Devices(Linear Technologies). I ...
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1answer
56 views

ISL85403 buck-boost converter

I have a requirement for a 24V +- 15% rail to power a laser sensor off of a 24V lead acid battery pack. I implemented the reference design provided by renesas for a 12V buck-boost converter(...
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1answer
55 views

How does an inductor limit a voltage booster?

I’m making a voltage booster to boost li-ion voltages 3v-4.2v to 5v with high current and a small footprint. I’m using TI’s Webench tool to help. It suggest a 1uH inductor for a 12A load, but if I ...
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2answers
86 views

Dividing output voltage from a buck boost converter

I am a student in high school and have been working with buck boost converters. I currently have a buck boost converter that steps up 5V to about 58V. I created 3 voltage dividers that should step the ...
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71 views

bode plot of LM3481 as boost converter

I have simulated an open loop boost converter using LM3481 average model, given by texas instruments and I got a very strange bode plot (More precisely, strage phase response), please can you tell me ...