Questions tagged [buck-boost]
A non-isolated DC-DC converter topology
138
questions
1
vote
0answers
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....
0
votes
0answers
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 ...
1
vote
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 ...
0
votes
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 ...
0
votes
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 ...
3
votes
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 ...
0
votes
0answers
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 ...
1
vote
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 ...
0
votes
0answers
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 ...
-1
votes
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?
0
votes
1answer
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 ...
0
votes
0answers
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 ...
0
votes
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 ...
0
votes
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) ...
1
vote
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 ...
0
votes
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 ...
0
votes
1answer
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 ...
1
vote
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 ...
0
votes
0answers
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 ...
1
vote
0answers
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 ...
0
votes
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?
0
votes
1answer
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 ...
0
votes
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 ...
0
votes
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 ...
4
votes
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 ...
0
votes
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 ...
0
votes
0answers
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 ...
1
vote
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 220ĀµH axial inductor (which according to ...
1
vote
0answers
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 ...
0
votes
0answers
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)....
0
votes
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 ...
0
votes
0answers
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 ...
0
votes
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-...
3
votes
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 ...
1
vote
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 ...
0
votes
0answers
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 ...
12
votes
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 ...
0
votes
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 ...
1
vote
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 ...
1
vote
0answers
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 ...
0
votes
1answer
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 ...
0
votes
0answers
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 ...
0
votes
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(...
1
vote
1answer
55 views
How does an inductor limit a voltage booster?
Iām making a voltage booster to boost li-ion voltages 3v-4.2v to 5v with high current and a small footprint. Iām using TIās Webench tool to help. It suggest a 1uH inductor for a 12A load, but if I ...
1
vote
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 ...
0
votes
0answers
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 ...
