Questions tagged [buck-boost]
A non-isolated DC-DC converter topology
3
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1answer
44 views
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 ...
0
votes
1answer
27 views
Complete discharging of Initially charged capacitor through Inductor
I have been trying to simulate a parallel resonant circuit in Pspice . The idea of the circuit is to discharge C18 (Cin) completely (This cap is initially charged to 1.3 V) through the inductor and ...
-3
votes
1answer
87 views
Buck-Boost converter without low side switch
Please look at the buck -boost converter below. It is 2 outputs, one buck and one boost output.
Would the circuit work as describe in the picture? In what condition the circuit will it work?
If so how ...
1
vote
1answer
28 views
LTC7813 buck-boost IC max output power
I am developing a power supply for a 24V 10A BLDC motor, which has to work with car and truck batteries (12V-24V). The real thing is that those batteries never have 12V nor 24V, instead, they could be ...
0
votes
2answers
66 views
How inverted buck-boost Boosts & Bucks
I am struggling to see how the "inverted buck-boost" converter works the same as a "4-switch buck-boost" converter. In my mind, a 4-switch buck-boost is simply connecting a buck and boost together, ...
0
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1answer
51 views
Buck/Boost converter TPS63070RNMT is not working properly
I am working on a Buck/Boost converter design which is based on Buck/Boost converter TPS63070RNMT. Below is the schematic design. All the selected components are as per the Section 9 of the datasheet.
...
-2
votes
1answer
41 views
DC-DC charging different voltages
I have several banks of batteries on a boat, two larger banks
48v electric propulsion system with regen
12v house bank
Each has a charging source the 48 has regen up to 2kw while sailing
The 12 has ...
-2
votes
2answers
57 views
is it possible to boost up the current by keeping the voltage constant?
I have a source that can deliver 20mA and 4.5V (MAXIMUM).
I need to boost the current to 1 A without using any further source. Also, the voltage should be maintained constant at 4.5V. is that ...
1
vote
1answer
29 views
Buck Converter and WS2812 LEDs
So to start off I am powering 70 LEDs through a 24V 6A power supply. The WS2812 LEDs require 5V operating voltage and about 50mA at their brightest setting (white light). I'm having this really ...
-4
votes
2answers
67 views
I want to boost 0.45V and 0.6mA to 0.7V and 3mA suggest me a circuit which can do that [closed]
I'm doing a project that basically transfer the power from a laser and light up an led using it.
The power output we are getting from the laser is at most 0.45V and 0.6mA (we used photodiode to ...
0
votes
0answers
42 views
KCL and KVL in AC AC Buck Boost Converter
This is the circuit of ac ac buck-boost converter with 4 switches.
When \$V_{input} > 0\$, switch 2 and 4 are fully turned on and switch 1 and 3 controlled by D and (1-D) respectively, and vice ...
0
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1answer
32 views
Increasing TPS63001 Under Voltage lockout from 1.8V to 2.5V for use with LiFePO4 cell
The Under Voltage Lockout threshold for this chip ranges from 1.5 V to 1.8 V. I want to use this with a LiFePO4 cell, whose minimum voltage is 2.5 V.
With reference to the datasheet here, the VINA ...
1
vote
1answer
83 views
Current sensing techniques in SMPS
I have gone through the following circuit provided by microchip technology and I get trouble in understanding the circuit circled in red the the image!!
As I understood, this circuit is used as a ...
1
vote
0answers
41 views
Buck/Boost Regulator Problems (TPS63070)
Questions:
1.) Why do input voltages of 9v and higher cause the regulator to output voltages in the range of 1.2v to 2.0v instead of the configured 3.4v if a load is connected to the output when 9v ...
-5
votes
1answer
104 views
explain the working of this circuit [closed]
I'm basically trying to understand how this Dc to Dc step-up converter work. please help me.[![dc-dc step-up voltage converter 1v-9v][2]][2] I need to design a DC DC step up converter using bjts. ...
1
vote
0answers
30 views
Battery Powered System and Input Capacitance
I have a battery powered system in which the battery is connected to a buck/boost converter to derive 3.3V from two or three AA batteries. The regulator I'm using is a TI TPS63050, and it has a power ...
2
votes
2answers
68 views
Buck/Boost converter interaction with MCU in sleep mode?
I am trying to design a battery powered remote controller that has the following components, TPS63802 (converter), AP9211 (battery charger/protection), Atmega328 (MCU), NRF24 (transceiver). The ...
0
votes
1answer
62 views
Small DC voltage boost without step-up boost circuit?
I have a simple DC circuit (Arduino related) with a USB power supply that's giving me 4.9V.
Is there a way, with minimal components and without using an inductor, to boost that voltage to 5.2V? I ...
0
votes
0answers
184 views
Buck-Boost Controller Arduino Nano vs STM32
I have 900W (150W*6Panels) solar panels and 12V inverter (1000VA) which have inbuilt PWM solar charge controller. The distance between pannels and inverter is around >10m and the wires are 6 sq mm ...
3
votes
1answer
116 views
How does the coupled inductor, capacitor and diode combination work?
I was reviewing a buck regulator circuit. Circuit was designed for 3.3 V output (Vout1)
simulate this circuit – Schematic created using CircuitLab
From this buck regulator output, a coupled ...
0
votes
0answers
68 views
What are the drawbacks of using a ferrite inductor in a boost converter circuit
I have dissected a boost converter so I can remake it on my own PCB. It works fine but I am now experimenting with using different inductors to reduce the overall footprint. I tried installing a ...
0
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0answers
41 views
SEPIC vs. ZETA feedback
When I was reading through the RECOM book of knowledge DC-DC, I found out that the SEPIC converter has more chance of having resonance feedback than the ZETA converter. They mention that the SEPIC has ...
0
votes
2answers
75 views
Buck Boost Battery 3.6V (Lithium-thionyl Chloride) to 5V
I hope this question has not been asked and it's not as far as I have seen.
I am developing an IoT project which uses almost no current (< 100uA) when sleeping and up to 80mA when running. The ...
0
votes
1answer
76 views
Adjustable non-inverting Buck-Boost converter failing right after starting in boost-mode
I am designing an adjustable non-inverting buck-boost converter based on LM5176 chip. Adjusting is done by DAC via feedback network, more on that technique can be found here.
The input voltage is 32V ...
0
votes
2answers
77 views
The output of a boost converter doesn't stay at 5 V
Let me start by apologizing for my english in advance :)
I'm trying to build an UPS for my raspberry Pi (even though I have basically zero experience in electronics). When the power cuts out, I want ...
0
votes
1answer
103 views
Low power design, choosing correct buck-boost converter for LiPo battery
I want your opinion on subject considering low power applications. I want to build basic loraWan tracker with Murata Lora module(3V3), and I want to use LiPo battery. What Im struggling with is power ...
1
vote
1answer
138 views
Buck-Boost converter not working right when fed by dynamo
So my plan is to charge a powerbank with a bicycle dynamo. I have got it to work with a full bridge rectifier and a linear regulator, it just isn't very effective. I used the following circuit:
(The ...
3
votes
4answers
301 views
How to convert a wide voltage range (1 V-12 V) to 5 V?
I have an unusual application where the input voltage can vary from 1-12 V DC. This must be converted to 5 V @ ~200-250 mA.
Since there are no available buck-boost converters suitable for this wide ...
3
votes
1answer
120 views
Buck/Boost Power Supply: What happens if we use much bigger Bulk Capacitance (i.e. 10x)?
If we take a buck/boost converter that is known to function correctly, but increase the bulk capacitance by 10x, what can we expect to happen electrically?
Background:
I took the design below off TI'...
3
votes
2answers
138 views
Boost converter with battery issues
I have a battery application. With an 11.1 V battery input, I need to maintain a 12 V, 2 A output as the battery discharges.
I bought a 1500 mAh, 11.1 V LiPo battery pack with a 35 C rating and I ...
2
votes
2answers
392 views
Cheap way to power blue LED on coin cell
I need a cheap way to take a 3v nominal coin cell and power a 3.3 forward voltage blue led. It needs to be cheap in production on a large scale, so a rudimentary joule theif won't work.
Ideally it ...
1
vote
1answer
293 views
TPS63070 Buck-boost not bucking or boosting correctly
Can some check my layout since I am using TPS63070 buck-boost regulator and I would like to get 4.7V output at TP12 but I am getting 11.5Vwhich is wrong and don't know why?
Base on the Datasheet R1=...
0
votes
1answer
134 views
Gate Driver topology for Buck boost Converter
I am implementing inverting Buck-Boost Converter in hardware as shown in the picture attached. The output of this converter is negative. so I will have an issue with its gate driver. The gate driver ...
0
votes
1answer
102 views
Boost converter for High Output voltage and High Output current
I want to design a variable power supply.
I need to get output voltage from 7.5 to 30 V and output current of 0-40 A.
One of the above values will be fixed while the other changes. This is for ...
1
vote
4answers
313 views
Why doesn't a boost converter help overcome USB cable resistance?
I ran a long USB extension cable from my pc to a WiFi adapter. The cable was too long and the gauge was too thin. So the resistance made the voltage drop to ~3V under load, making the WiFi adapter ...
3
votes
3answers
513 views
is a voltage regulator required for atmega328p when powering from boost converter at a set voltage?
I know that linear voltage regulators are more accurate at holding the required voltage but the boost converter i am using seems to keep a pretty steady one. the voltage will of course be within the ...
2
votes
3answers
318 views
Dual power supply with two boost converters
I currently have a dual power supply, that supplies +/-15V. One -output of the PS is connected to the other channel's +output (GND). Now, the problem is that I need +/-50V. I bought two step-up boost ...
1
vote
1answer
59 views
LTC1775 Buck converter component question
I am trying to design a 12v,10A buck converter using a with LTC1775 and have gone through the calculations assuming a 40% inductor ripple current and a switching frequency of 150kHz. This gave an ...
0
votes
2answers
112 views
state-space model for bidirectional buck-boost with input capacitors
I'm having some trouble simulating the behaviour of a bidirectional buck-boost converter for battery charging purposes. The circuit looks as follows:
I would like to create an averaged state-space ...
0
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0answers
42 views
Analysis of the full bridge bidirectional converter's buck mode operation?
This is the circuit I was trying to learn.
Here is the equivalent of the buck mode operation:
And following is the waveform in the buck mode of operation:
My intention is to derive the output ...
0
votes
0answers
21 views
Dedicated li-ion step up drivers
I have a design which will include the optional use case of boosting up to 7V from a li-ion battery.
I can't seem to find any drivers dedicated to li-ion for this? There seem to be a few buck boost ...
0
votes
1answer
84 views
Can I use dc-to-dc converter to step up voltage of 20 3.7V 3Ah lithium-ion batteries connected in parallel?
I want to use this 3.7V 40Ah powerbank to power my e bike's 48V hub motor. So would it be a bad idea to step up 3.7V all the way up to 48V? Would there be a huge Ah loss?
0
votes
0answers
43 views
DC to DC boost current problem
I am attempting to boost a DC power source (from either 12V20A PSU, 12V 120W car cig port or 14.8V 10aH Lipo) to 26.1V and 6.9A (or 4.5A) using the car cig port taking power limit into account.
I am ...
0
votes
1answer
142 views
buck converter doesn't work [duplicate]
I am doing my project. and it's about a DC-DC converter.
I am using HCPL 3021 as a driver for the MOSFET IPPR045C7.
in open loop cicuit, I am using Vin=60V, with duty cycly = 60% of PWM signal (F=...
0
votes
1answer
66 views
Buck Converter - Ripple Current
I think I understand the buck converter operation (continuous conduction mode) except I'm a bit confused about the ripple current. Here is what I know so far
I understand everything up until the last ...
3
votes
2answers
305 views
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.
...
2
votes
0answers
71 views
Is a 90V output spike normal for a 45V buck boost converter?
The LT5176 buck boost converter outputs a short 90-91 volt spike at at the output in the 2nd second after startup, applying power to Vin.
Schematic
More details at Why does this buck boost with ...
1
vote
1answer
275 views
Running 5v 4A device using 18650 batteries
I'm working on a project involving a SBC, IR LED's and a screen. All of them together draws 3.5 to 4 Amps and voltage of-course is 5v. I'm hoping to run this using 18650 (3.7v), I have a couple of ...
0
votes
1answer
94 views
LTC3534 - Buck-Boost not working
I am trying to incorporate a Buck-Boost DC-DC converter into my design using the LTC3534 and I cannot seem to get it working.
Below I will post images of the datasheet recommended design, my ...
1
vote
1answer
50 views
PD compensator matlab
I have a little problem which I cannot understand, control theory is not my specialty but I have been reading on it lately.
I have a buck-boost converter which I modeled on matlab and I am trying to ...
