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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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Dual active bridge converter

I'm having issues calculating the power losses associated with the operation of a bidirectional isolated Dual Active Bridge DC/DC converter. The converter is controlled using Phase Shift Modulation (...
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42 views

How can I size the current ripple of a DC-DC converter for lithium batteries

I am designing a bidirectional DC-DC converter to charge and discharge batteries on a DC bus. The power of this converter is 50 kW and the average current in the inductor (the same as that on the ...
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63 views

PoE+ Forward Converter Issues

I want to implement a 12v PoE+ PD power supply, and have settled on the LTC4269 for use in this application. Unfortunately I'm having problems getting my head around everything that is going on. A ...
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55-650V to 5V DC/DC convertor design

For an application I am building I need a custom DC/DC convertor that can convert a voltage ranging from 60V-600V to a contant voltage of around 5V. Using the TI Webench with the paramaters Vin_min = ...
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Why does my SEPIC converter output more power at higher temperatures? What are the implications of this behavior?

I have a Pololu S18V20ALV SEPIC voltage regulator board that is wired to a high-amperage 5V USB power source on the input and a DC brushless fan on the output. The output is set to about 5.5V. ...
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39 views

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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33 views

How to generate and/or improve this power distribution for these 4 subsystems?

I am trying to design a system that is powered through a 28V wall adapter and a 6S cells LiPo battery. The system has a subsystem that takes care of the balanced charge, coulomb counter, charge ...
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52 views

Why is the negative rail oscillating in this TPS65130 based design?

I designed a board with +-10V dual rail supply that are generated by a TPS65130. The design is loosely based on the reference schematic and layout. I had to move some components around due to board ...
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80 views

Laser Diode Driver and Cooling

I am a newbie at analog design, and trying to design a laser diode driving circuit and TEC cooling circuit for a 14 pin laser diode, such as P1550-ADF-B: 1550NM ADF LASER DIODE which has forward ...
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29 views

Synchronus dcdc converter shunt RC filter design

I'm struggling to find a guide/application note or whatever that explains the calculation, considerations and layout of an RC filter for current sensing on a synchronous DCDC converter (like the ...
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75 views

Charging 3.7V battery from 300W+ generator

I am doing a project involving a bike generator of 500W. All of my previous projects were small LiPo battery powered devices so I want to double check certain aspects of this relatively high power ...
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61 views

Possibility of hybrid forward-flyback topology

Within the context of isolated converters, the flyback topology is nice in its simplicity as can be the forward topology, in spite of needing a second primary reset winding. However, both make poor ...
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161 views

Average current mode control compensation

This is the structure of average current mode control (source here). Please look at signal \$V_{com}\$ at the positive input of PWM modulator. For proper operation, in steady state the magnitude of ...
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34 views

Constant output voltage from varying DC for ZETA

Am modelling a variable DC fed ZETA converter.The output is expected to be constant at 20V. The design is followed from Texas instruments documentation (link). The source is expected to operate ...
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183 views

High current draw through DC-DC boost circuit

I currently have a simple circuit below which works fine but I am confused with the readings I am getting for when the Atmega1284P is put to sleep. When it is operating I get a current draw of around ...
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117 views

SEPIC converter working in BURST mode without having one

I designed a SEPIC using the LT3467 with coupled inductors. It supply 17V starting from a 12V input. On the simulator (LTSPICE) everything works, but on the test board there is a problem. With 70mA ...
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103 views

How does this circuit oscillate?

I once found out that basis of this circuit looks like a Royer oscillator. What makes this circuit oscillate? Especially, it is still not clear in my mind that what is the function of capacitors and ...
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276 views

Bidirectional Converter Switching problem on Mosfet

I want to ask. I designed a bidirectional converter with synchronous buck converter as the circuit configuration. The problem is, the switching mosfet. When i applied lower voltage at the input (10V), ...
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345 views

Analysis of a Bi-directional DC-DC converter

I'm building a bi-directional DC-DC converter that will be used to charge and discharge a supercapacitor stack. The design we came up with uses a 4-quadrant chopper, to allow buck-boost both ways. I'...
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PT4115 LED driver

Excuse me if my question is too specific. I'm trying to get an LED driver using PT4115 work. I've spent hours but no success. I've created exactly the circuit depicted in the datasheet. I have used 0....
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128 views

resonant frequency in a series resonant converter circuit

I am designing a series resonant converter and wanted to convert 700 VDC to 100 VDC by using galvanic isolation. The switching frequency should be about 300 kHz (the output load is R = 1\$\Omega\$). ...
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148 views

LTSpice simulation :Unable to check the output values

I am new in LTSpice simulation .I have prepared the schematic of the following DC to DC buck converter design in folder i.e. C:\Program Files\LTC\LTspiceIV\Rough\ . My aim is to make a charger for a ...
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495 views

Design of a half bridge converter

I am trying to design a half bridge isolated DC DC converter but I am encountering some issues. Is there an effective way to come up with a minimum value of capacitors C1 and C2. In all the papers ...
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113 views

Active clamp forward converter (High side and lowside) with synchronous rectification

Please help me with the detailed description of Active clamp forward converter with synchronous rectification.I have seen a lot of journals regarding this and I am getting more confused when I ...
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309 views

Fly-back converter

I'm trying to get 2 isolated outputs (5V and 3V from 12V DC supply) using a single flyback converter by adding one more secondary winding on the flyback transformer. Following is the Simulink model I'...
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876 views

DC/DC Converter MOSFET switching

I am currently building a SEPIC converter. The signal arriving from the MOSFET driver to the MOSFET seems all good, however the Vds doesn't seem to follow the drivers signal and it makes the MOSFET ...
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2k views

Step Up DC DC [12 to 300] using MAX1771 Chip

I am trying to build my first circuit following the information posted here 12v to 300v Boost Converter - Ideal Inductor for 9kOhm load I tried to answer there before opening this new topic,but I need ...
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256 views

How can this isolated DC/DC converter claim a 3kv rating?

I'm referring to the Murata Power Solutions CME series DC/DC converters. Datasheet: http://www.murata-ps.com/data/power/ncl/kdc_cme.pdf If you look at the footprint of package (the -3C variant), ...
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1k views

Inductorless DC to DC step up converter

I'm trying to make a DC to DC boost converter without inductors. Actually, I don't know much about this kind of circuits. I did a research on the net and I found the circuit below. But the problem is ...
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156 views

Multiple stacked DC-DC converters

I am trying to minimze the output voltage ripple of a 4-layer pcb power supply and am curious as to what approach would be better. So I have 6 low voltage high amp buck converters feeding 6 chips. ...
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323 views

Trying to choose a high current DC/DC step-down converter

I'm working on a project that will drive a long length of LED strips, the WS2811 kind built into 5050 LEDs on a flexible strip. I've got most of the project worked out, except for power. Since it ...
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455 views

How can I build a 12V to 24V DC-DC Converter with up to 3A of Output current to power up a motor

I've built a 12V to 300V boost covnerter using a MAX1771, but now required one which can handle up to 3A with a 24V output. Should I attempt this task with the same chip or could someone point me in ...
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33 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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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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29 views

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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48 views

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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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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44 views

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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40 views

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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39 views

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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33 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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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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35 views

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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36 views

DC-DC bidirectional converter buck configuration

I am looking to solve the low frequency mismatch between the input power and output power of a single phase inverter. This is usually done with a very large electrolytic capacitor. I am looking to ...
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63 views

How to do switching noise analysis of dcdc on LTSpice

Background : In one of my board i have used LT8471 as DCDC , as my cards being analog cards, i tried maximum to seperate the power network and analog chain from noise, my initial problems with dc-dc ...
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32 views

How to model parallel dc-dc converters (transient analysis)

I would like to simulate two dc-dc converters in parallel using my own c++ algorithm. At the moment I have created averaged state-space equations for both converters, but struggle to get my head ...
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47 views

Issues to create a current control transfer function for a DCDC Converter

I'm trying to reproduce a work I've seen in an article, but I'm encountering some issues. I used the data provided and the transfer functions placed by the author, but I did not get the same result, ...
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124 views

Who can show a schematic for a voltage switch

In earlier questions I raised a problem about a DC-DC booster that destroyed itself when its load was disconnected by drawing a large current from its input power source. This was specific when using ...
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101 views

Fly-Back converter in Proteus

I have been having this problem since I started to design my Fly-Back type voltage converter, and it is that it is throwing me a time step too small error, and I tried to solve it by configuring the ...
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32 views

Forward converter power

I found a TI reference design, which is class 4 PoE with 25W output power. I looked at the schematic and made some calculations: I looked up the transformer turns ratio, which is P:S = 1 : 0.16 (...