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Questions tagged [dc-dc-converter]

DC-DC conversion. Implies conversion of a DC voltage level up or down. DC-DC converter can be isolated or non-isolated. Electronically it can be done by many kinds of circuits, depending upon the application (charge pumps, voltage multipliers, linear voltage regulators, boost/buck switched ...

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Function of transformer as a filter in isolated DC-DC converters

As far as I understand the isolation is achieved by a transformer(and besides this sometimes also using an optoisolator for the feedback part) in a DC-DC converter. And this is a galvanic isolation.(I ...
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How to fully shutdown a boost converter?

I've been working on a boost converter based on an LM2733-Y integrated circuit, as follows: My question is, how to shut it down completely? If the SHDN pin is in low state, I get the input voltage ...
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Designing a +10 V -10 V +7 V DC power supply for audio equipment

I've recently purchased a tape recorder (Tascam Midistudio 644) that was very cheap because the previous owner had lost the power supply. The PS-M1 power supply that originally came with this unit is ...
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Suggestions for utilizing a lithium-polymer battery to power a microprocessor and approximately 5m of 144 LEDs/m?

I do apologize if this may be asked by someone else in a different context but as someone with no prior knowledge or understanding of electrical work, I may have overlooked and overthought about my ...
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Choosing a suitable power supply for a MOSFET driver chip

I would like to use the TC4427 MOSFET driver chip, in order to switch the current through the IGBT AUIRG4PH50S, which will be placed in series with a resistive load. The power supply providing the ...
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35 views

Buck converter MOSFET

I want to build a buck converter and step down the voltage from 100 V to 12 V. My question is: Should I use p-channel or n-channel MOSFET, and why?
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5V to 5.7V step up converter with 2.5 A max [closed]

I am looking for the device to step up 5V to 6V which can be deliver upto 2.5 A max. Greatly appreciate for any suggestion. Thanks,
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BGA package LTM8064 switching regulator thermal management Consideration

I'm using ltm8064 for an application which required 24V, 4 amp output which causes 7W of heat dissipation. In the datasheet thermal resistance of junc to case(bottom) is 2.2 c/w and junc to board in 6 ...
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12V to 5V DC-DC converter is outputting 7.5V

I recently bought these DC-DC converters. But when I apply 12VDC to the input I always observe 7.5V on the scope instead of 5V, I tried with a 680k load still 7.5V. But the datasheet says this is 12 ...
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60 views

Voltage control

I've been trying to design a control circuit to switch supply. What I want to achieve? I need 24V voltage for supplying an ultrasound sensor. There are two ways of gaining 24V: ...
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43 views

boost converter to high voltages (20kv+)

I am interested in making a mini, potentially portable ion thruster. The Question: Is it possible to create a boost converter that takes low voltage batteries ranging from 3.7V to 24V and boost that ...
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What is the voltage gain of the converter

Please refer the following figure: This is a small signal circuit model of a converter. The volatge gain( vo/vin) I am finding is not as it should be. I think I am doing something wrong in ...
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Rapidly switching multiple loads with the same power supply

I'm new to electronics and did a lot of work by myself on this project. I've found many informations but i have difficulties for some aspects of it. My project consist of switching of multiple loads. ...
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Coupled DC/DC-modules - correct input filtering

According to the support from TracoPower I use two THN-30WI modules (­±15V) in conjunction as shown below (without each C1 and C2) to produce ±30V. This works but I get a lot of noise. The ...
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Design an AC/DC Nonisolated Switching Mode Power Supply

I'm designing a fifth generation pcb for my project and yet I stumbled across another design problem. First of all, the circuit and all components are enclosed from the environment and users (because ...
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how to choose components for boost converter

I'm relatively new to electronics and I'm trying to make a boost converter for a nixie tube watch that runs off of 3v. I'm pretty sure that the most current that will be drawn is about 70mA. I'm not ...
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35 views

What practices would improve this scenario for the power transfer

As a part of a measuring project by a mobile phone on the top of a 100 meter tall mast, the mobile phone will be powered by 5V DC of a DC-DC converter output where its input voltage is 12V DC on the ...
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how does a modified three level Inverter works?

As you see in the figure below, a modified three level Inverter with its explanation. for me, when the T3 is on during the positive wave, the output voltage is zero no matter what the high buck ...
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IR2301 Boost Converter

I am trying to build a boost converter using the IR2301 MOSFET gate driver. I succeeded in building a buck converter, by following the diagram shown below. The mosfet was driven on a high side whereas ...
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Isolated vs non-isolated boost converter for LED (12v to 24v)

I have a 12v system in my motorhome and planning on installing 24v LED strips, however, I'm unsure whether I would need an isolated or a non-isolated boost converter. I'll be using roughly 5 meters ...
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Flyback converter boosting operation failure

I have designed a 20W flyback converter, in the open loop operation, when the duty ratio is below 0.5 it works perfectly (hardware not simulation). But when I go above 0.5 , that is in boosting mode, ...
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39 views

Burst mode in synchronous buck converter with current mode control?

I read this previous question: The meaning of Burst Mode It says burst mode happens when the resistance of the load is light and the system stops switching the MOSFETs. However, I just cannot ...
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How to get two outputs of 5 and 12 V from bench power supply using DC to DC converter

So i want to design 3 circuits which are similar in structure. Input of the first one is anywhere between 0-5V and i need 2 outputs 5v and 12v Input of the second one is anywhere between 5-12v and i ...
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How to deal with “peaks” voltages in mosfet in boost converter?

I'm designing a Boost Converter to go from 5 [V] to 12 [V]. The design I came with is the following: To understand better the design, please note the following: 1) To drive the mosfet I'm using a ...
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69 views

DC converters for solar cell

As we know, the voltage level of a solar cell is lower than what a rechargable battery needs, and thus a DC converter is placed in between.( With feedback control for optimum V-I curve) This just ...
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Difference series resonant and LLC DC/DC converter

What is the exact difference between a series LC resonant converter and an LLC converter. From a topological perspective, they seem to be exactly the same. I believe that for an LLC, also the ...
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Diagnosing shorts in circuits involving power supplies

I was using a dc power supply connected to a wall outlet with a neutral and live wire. (https://www.amazon.com/gp/product/B074YHN8D1/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1). This was on first ...
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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 ...
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5V Regulator causing component damage [closed]

Im using a 5V OKI Murata DC-DC device to power an Arduino UNO R3 and a 4 channel 433MHz receiver. Ive got a 24V DC source which is a bench PSU at the moment. But ive noticed that every so often the RF ...
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90 views

Flyback Converter Capacitor Value selection with given ripple voltage limit

I need to design a flyback converter for my project. In my design the output voltage is 15 V. I calculated all the parameters including inductance values, diodes selection etc. However there is a ...
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1answer
44 views

Acceptable Buck Converter Output

I've just put together my first busk converter with a LMR16006Y-Q1. http://www.ti.com/lit/ds/symlink/lmr16006y-q1.pdf Here is what it looks like on the scope. The Pink signal is unloaded, the other ...
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DC/DC Converter Output Power Rating

Looking at chips such as AP6502A TPS5430 The output capability is rated in peak and continuous current. Why are they not rated in terms of power? What output voltage is this current rating for? ...
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52 views

High Power Battery System: Variable Input DC Voltage to Fixed AC Output Voltage

We are a team of students trying to build a battery system which would recreate wall socket conditions with up to 2kW output. Some of the main challenges are basically to have the battery's variable ...
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93 views

Li-ion battery powered circuit design

I designed a PCB, but I'm unsure whether this topology correct or best one. The circuit powered with Li-ion battery and the battery should charge over USB. When USB has not been connected, Step up-...
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35 views

Synchronous rectifiers in Forward converter

I'm trying to implement self-driven synchronous rectification on a Forward converter. At higher loads the efficiency is improved (compared to using Schottky diodes), but at no load or lower loads (...
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Powering a circuit from either USB or LIPO

I have a small hobby project which includes MCU and some peripherals. It is powered by 3.3V power source and consumes 200mA-800mA for up to a minute. However, most of the time it's in deep sleep mode ...
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How to deal with an inconsistent / noisy power signal?

I'm using a 12v power supply to operate a system of sensors that is very sensitive to fluctuations in the voltage input. Unfortunately, I can't control what goes on upstream of my components and this ...
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73 views

Placement of feedback line on DC DC converter, before or after cap? (and dropout problem with LT8390)

I am using an LT8390 DC to DC converter, I have a highly inductive load and it is causing dips. The dips are shown here (and about a 6V drop for 7ms): I need to get rid of the dips, which I will ...
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283 views

How many amps does a 18v cordless drill draw?

I have bought an old 18v black and decker cordless drill but with broken batteries, for that, I want to buy a boost converter to convert 12v (max 20A ) from a computer power supply to 18v and use this ...
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55 views

Increase Boost Converter Current

I'm building a portable charger for my phone using a large 2.7v supercapacitor, which uses a very simple boost converter to create 5v. I am not concerned about input current, however, when a load (my ...
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DCDC converter load step and phase margin

When applying load step to a DCDC converter we can approximate the phase margin from the presence/absence of oscillation and the crossover frequency as well from the response time. The question is: ...
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Why doesn't my bench PSU read current on a breadboard?

I've recently purchased a cheap eBay DPS3012 DC-DC converter supply. I intend to use it on breadboard projects. The "problem" is that the meter reads a 5V output, with no current being drawn and ...
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2answers
50 views

Feed-forward capacitor in SMPS feedback

I was looking at the TPS63700 DC-DC inverter datasheet and stumbled across the schematic below. It is a more or less usual buck-boost inverter topology schematic, except for the weird R4 and C3 ...
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Can a coil gun be made with a boost converter instead of caps?

So I’ve been starting to build a coilgun, and I find most designs either have capacitors or are just really bad. But could a high-voltage boost converter (40000v) and a momentary switch not be used to ...
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40 views

H-bridge using HCPL3180

I need help with my project which consists of designing an H-bridge with PWM. So far, I have designed half of an H-bridge, however I am not sure if this is correct. Can somebody guide me into the ...
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3answers
118 views

Can I convert 72V to 12V using potential divider?

In our automation project, we'll be using a buck converter to convert the DC voltage from 72V to 12V. This method of conversion is quite expensive!! We are converting the voltage to power the ...
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1answer
68 views

Zeta topology DC-DC converter unstable

So I've tried to build a Zeta topology DC-DC converter based on a simple buck converter IC XL4016, which works perfectly in a regular buck topology. However, when hooked up in a Zeta topology as shown ...
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add different current loads to test noise on DC-DC converter

I want to test the LTM8021 DC-DC converter (using an eval board I bought - schematic for it is below) for noise output at varying current loads (10mA, 100mA, 200mA, 450mA) and still fairly new to this....
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Problem opening a PLECS blockset in MATLAB

A friend of mine sent his simulation of a converter for which he had used PLECS. It is in the format "example.slx". I have MATLAB R2017b. I downloaded the PLECS block set for MATLAB and activated it ...
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864 views

Cuk topology patent

While searching for a good inverting SMPS topology, I stumbled across the Cuk topology which suits me perfectly by all means. The only thing that worries me is that unlike more common SMPS topologies, ...