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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2 views

Not getting stable voltage output with DC-DC Buck Converter

Coming from a computer science background, I'm new to electronics and my first post here. I'm working on a hobby project with the intention of designing a PCB eventually and the first step is to ...
1
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3answers
93 views

Can I use two DC-DC Converter modules to generate a +5V and -5V Rail?

These converters from Pololu look great (https://www.pololu.com/product/2831), but I need both a positive and negative rail. Can I use two of these to make a +5V and -5V rail? For example. if I tie ...
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0answers
67 views

How to construct a DC Home Supply System

So I've been thinking hard of how to construct a DC socket to use in combo with a solar setup at home so as to cut losses in using inverter plus DC appliances seem to be generally more power efficient....
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0answers
27 views

Switching ON/OFF the enable input pin of TPS63060 DC-DC switching converter

I need to make an ideal switch to turn ON/OFF the EN pin of a Texas Instruments TPS63060 buck-boost converter. Now, my PCB has got a MC14093B "Quad 2-Input “NAND" Schmitt Trigger" to drive the gate ...
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1answer
62 views

How to create constant 5V 300mA from 0…6V variable voltage source (voltage generator)? [closed]

I'd like to solve the above-mentioned problem by using a buck-boost or SEPIC DCDC converter. I haven't successfully found any suitable ICs though. SEPIC converter with input voltages from 4.5V to ...
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2answers
72 views

-5v from +12V input

In my application, I need -5v for OP-AMP application. Load on -5V is 200mA. I have come across various possible ways, as follows: 1) Using TPS5430 as inverting buck boost We are using TPS5430 in ...
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2answers
99 views

DC Voltage Supply

new here! And I know just enough to be dangerous! I'm building a toy for my grandchildren that consists of LED lights, switches and knobs, small motors and sound circuits, etc. I used 3V as a spec ...
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1answer
69 views

Can a rechargable dash cam battery be replaced with a dc-dc converter in-place?

While reading this question, where a user is having difficulties with his dashboard camera battery, I noticed that one of the answers suggests (or seems to suggest) to replace the existing battery ...
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1answer
30 views

Select sampling frequency to closed loop control in a DC-DC converter

For a DC-DC converter in current mode control the control variable is the inductor's current, which at steady state is periodic. which is the ratio between the switching frequency and the sampling ...
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2answers
39 views

Charge a 6S Li-ion pack with a boost converter

Hi fellow makers and engineers, I'm trying to charge a 6S Li-ion battery pack (6 NCR18650B cells in series) using a rectified DC voltage of 16 Volts and boosting it to about 25.2V to charge the pack ...
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1answer
70 views

someone please help figure how many hrs i can get out of the battery fully charged. as i have a very import 6hr. event that's coming soon. [closed]

I have a set of LED xmas lights at 110V 6-10watts. I need to use a battery thats 12v ,7amp hour along with a converter: SNAN 300W Power Inverter DC 12V to AC 110V Car Inverter with Dual AC Outlet ...
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2answers
45 views

Current in Buck Converter

In Buck Converter, when switch in ON, Vi(I/P voltage)=Vl(inductor Voltage)+Vo(O/P voltage)when we switch it On, current increases linearly(according to the wikipedia) then Vl=Ldi/dt=constant and Vo(=...
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0answers
39 views

Powering USB hub via batteries causing problem

First of all sorry for bad english, secondly I am noob when It comes to electronics. What I am trying to do: I am trying to connect multiple mobile phones to Raspberry Pi via USB hub. Naturally I am ...
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1answer
34 views

Connecting the Beaglebone Black to the KK Mini flight controller

The flight controller needs to be sent 4 PWM signals at greater than or equal to 5 volts. Since the Beaglebone Black(BBB) GPIOs can supply only 3.3V I needed to change the signal from a 3.3 volt one ...
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1answer
64 views

Isolated DC DC converter operating principle

I'm doing a course project on electrical engineering subject. I have to use this specific DC DC converter ISL2412 XP Power DC DC converter. But before I can use it, I have to explain how does it work. ...
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2answers
61 views

What SMPS topology is this?

I came across this SMPS topology that I don't recognize. It looks sort of like a combination of a buck converter and a boost converter, but I can't quite figure it out. I haven't been able to find ...
0
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1answer
49 views

Modifying switching power supply to produce any voltage(s)

I have few units of 24V 3A output smps power bricks. I'm planning to mod one of this to generate 12V at least at 5A for my LED strips. My idea is to tap two wires from the secondary winding of the ...
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2answers
73 views

Can a system with a response Y(x) = ax + c be called linear?

I made a DC-DC converter its ideal transfer function is: $$ V_0(D) = DV_i $$ I took measurements of its response and then made a linear regression, I got this result: $$ V_0(D) = 0.98DV_i -0.42 $...
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2answers
100 views

Buck converter worked for 1000+ start/stop cycles with power from regulated DC power supply, failed with li-ion battery

I have a project which uses a TI step down converter (LMZ14201) to buck an input voltage (up to 41V) down to a regulated 5V. Until now, I had successfully used an adjustable (regulated) DC power ...
1
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1answer
64 views

Battery Charger using a buck converter

I'm designing a Lead Acid battery charger with 3 stages. For the 2nd stage (constant voltage stage) as it is written in literature: the voltage applied on the battery must be dependent on temperature. ...
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1answer
54 views

Experimental efficiency curve of a buck converter

I made a buck converter, And I tested the circuit under following conditions: Vi = 32V R = 6.8 ohm Fs = 125kHz I got this result: I think it's kinda odd that the difference between ...
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1answer
57 views

How To make Variable Power for a Trolling Motor [on hold]

I have a trolling motor that works, but the circuit board does not work. I am looking for a way to make it a 3 speed motor. I have a switch that allows for 12 Volt input and then based on the ...
0
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1answer
99 views

Why does the capacitor takes the high-frequency current at the output of a dc-dc converter?

Lets assume that delta IL = 3A if the switching frequency es 10khz, the capacitive reactance will be Xc = 0.0397 ohm, it makes sense to asume that the current ripple will go to the capacitor, since ...
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2answers
77 views

Step up converter - voltage drop on load

I decided to build step up regulator to power DHT22 (temperature sensor) from two AA bateries. The DHT22 needs 3V (or 3.3V acording to some datasheets) for operation. I picked up MCP1625 (from ...
2
votes
1answer
75 views

Switch utilization in dc-dc converters

In the book, Power Electronics, by Need Mohan at the end of chapter 7, it is this image: Relating the output power and the power that the transistor is handling, I want to reproduce this plot for ...
1
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2answers
74 views

Buck converter after 50Hz transformer

I plan on designing a variable power supply (1-50V, isolated), able to provide a power of about 50W. For efficiency's sake, linear regulation is out of the question. The natural thing would be to ...
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2answers
64 views

Are charge pumps better than boost converters since charge pumps do not use inductors?

Charge pumps use capacitors and not inductors. https://en.wikipedia.org/wiki/Charge_pump Boost converters require inductors. https://en.wikipedia.org/wiki/Boost_converter Both charge pumps and boost ...
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1answer
35 views

Guarantee Continuous conduction mode dc/dc buck converter

In a buck converter the continuous conduction mode it depends on following equation: $$ L_{min} \geq \frac{(1-D)R}{2f_s} $$ For a fixed load and inductance value, the operation mode will depend on ...
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0answers
19 views

Can I use AL- capacitor to pth05050w?

Now, I'm trying to test with PTH05050WAH module. PTH05050WAH MODULE PIP .8-3.6V 6A HORZ T/H My power source is SMPS 5V 2A adaptor and I connect directly the 5V power source of adaptor to 3 pin of ...
0
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1answer
68 views

1V to 5V dc-dc step-up circuit @ Iout = 1A

I am trying to convert unregulated 1V input to 5V, 1A output within a project I am working on. I have tried working with MAX757 but could not get it to work. It takes a couple of weeks for maxim ICs ...
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1answer
44 views

PSpice Simulation of CE8301

I have been working on a project that requires me to boost 1V to 5V. I have found a ready-to-use boost regulator that gets the job done. The problem is that I need to get the circuit simulated on ...
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1answer
46 views

what kind of type resistor do I need in PTH05050W? [closed]

I found what I need to apply my xilinx virtex5 FPGA board, PTH05050W 6-A, 5-V INPUT NON-ISOLATED WIDE OUTPUT ADJUST POWER MODULE at www.ti.com. Maybe, this need to change by resistor to set output ...
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0answers
16 views

Estimate realistic parameters of transformer for educational simulation of DC/DC converter

I am trying to simulate a full bridge DC/DC converter with SimPowerSystems for educational purposes using the datasheet of a specific converter as example. For the simulation I need the following ...
3
votes
1answer
80 views

Is it good practice to couple the grounds of isolated supplies with capacitors

I once saw the following on an isolated dc/dc converter data sheet and have been doing it ever since with my dc/dc converters, but I wanted to ask to make sure it actually makes sense. Whenever I ...
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1answer
41 views

Does it matter what the input voltage is to a DC/DC step-up converter?

I have a converter that outputs 5v and 1 amp. The input voltage can be 2.5-6 volts. Does it matter as long as it is in the range? Also, will the current draw from the batteries differ if I change the ...
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2answers
184 views

Is my 600W boost broken or malfunctioning?

I'm asking this mainly as a sanity check and to distinguish between whether I've just done something wrong or need to buy a new one. I have a "600W" boost converter based on the UC3842A SMPS w/ CC ...
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votes
1answer
86 views

Automatic adjusting output into automatic adjusting input [closed]

I have a solar panel with a built-in 6-18v auto adjusting output (based on draw) and a step up/down 1.5-24v DC-DC converter with an auto adjusting input. I was thinking of using them in conjunction ...
0
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3answers
89 views

Converting voltages using LM337

I have 2 questions: Is it possible to generate -35V from LM337 regulator with -12V in input?? The voltage output from LM337 is supposed to follow this equation, -Vout=-1.25(1+R2/R1)+Iadj.R2 but in ...
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2answers
71 views

unknown component in datasheet

im using xl6009 dc to dc converter , in page no 7 of datasheet the sepic inverting topology is show which generates 12 and -12v .my doubt is what component is used, is it a transformer or coupled ...
1
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0answers
121 views

convert [-24V,24V] range to [0V,3.3V] range

I need to realise a circuit that converts an analog signal from [-24V,24V] to [0V,3.3V] before sending that signal to an ADC "MCP3208", I found the circuit in the picture above,it works perfectly in ...
2
votes
1answer
54 views

What is a point-of-load converter?

Can you please give me a definition, or at least a more specific context, of the term "point-of-load" converter/regulator? I have seen around explanations on related products or applications but no ...
4
votes
1answer
110 views

What's an efficient way to get below the standard 1.25V on buck converters?

So, I purchased a buck converter which was advertised to be able to range down to 0.8V but, as you can probably guess, it only goes down to 1.25V which I understand is the reference voltage for the ...
0
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1answer
34 views

synchronous buck converter with different MOSFETs

do you know if it is possible to use different type of MOSFETs in a syncronous buck converter for the hi-side and the low side switch? How does this improve the converter efficiency? Thank you
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1answer
50 views

Negative voltage from positive output DC/DC

my DC/DC ( http://www.ti.com/tool/PMP10077 ) has 200 V output on pins +HV and GND. Can I get negative output by simply swithcing the meaning of output pins -> I will use +HV as GND, and GND as +HV. I ...
0
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1answer
69 views

Two DC DC converter with different output - In series or parallel?

Source: LiPo Battery (13V - 16.8V) Consumer #1: 5V (RaspPi) ~1A Consumer #2: 12V (variouse) 0-3A (plus ~1A if series) DC/DC step down: two LM2596 Which would be the better solution: LM2596 #1 on ...
0
votes
4answers
93 views

Implement ac-dc converter for low frequency and very low voltage without external powering?

Iam using a basic cascade voltage multiplier to boost and rectify the 0.3v ac signal. The circuit rectifies but the boost is very less. So I thought of using LTC3105 after this stage to get a ...
0
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2answers
104 views

Isolated 1-10V (or 0-10V) output

I need to control an LED driver with analog 0(1)-10V control input. This control device should be very cheap and compact so until now I made a schematic which uses the fact that those drivers have ...
-1
votes
1answer
47 views

How to reduce VOC of solar panels to match the MPPT of inverter

I will have an off grid solar panel system to run my deep well 5,5 Hp water pump. I already got 24 of 250Wp 36,3 Voc panels and 3 phase Delta VFD C2000 inverter/driver. for this system I need to wire ...
-1
votes
1answer
86 views

Convert 24V dc to negative 24V dc [closed]

My circuit is supplied by a 24V DC generator, but I have amplifiers in my circuit that need to be supplied by 24V and -24V, so I need to generate -24V dc from the 24V that I have from the generator,...
0
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2answers
42 views

Can I feed a 5V boost converter with 4xNiMH cells?

The spec page of my DC-DC boost converter (couldn't find a datasheet) says ”the input voltage should be kept below the output voltage”. And 4x the nominal 1.2V from an NiMH cell is below my 5V output ...