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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2answers
29 views

HF transformer fed fed diode rectifier not working

As part of my pure sine wave inverter, I have a DC - DC subsystem in which a signal stepped up through a HF transformer is put through an uncontrolled diode rectifier to get a DC output which I am o ...
1
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3answers
43 views

Most efficient way to PWM a boost converter

I am stepping up ~4V to 12V to power an LED strip with a boost-regulator. I don't want to run the LED strips (3 leds in series with a resistor) at full brightness so I need to PWM them. Is it better ...
0
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0answers
27 views

DC-DC converter current rating

I am using this dc-dc converter. Now, my load is approx 260W (at 24V).So, I will need approx 10.9Amps. Now, from the datasheet I see its max current is approx 10.7Amps. It is shown as operating output ...
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1answer
27 views

DC-to-DC conversion for solar, off the shelf or custom?

I am working on a small solar power system. The critical problem right now for me is how to do the DC-to-DC conversion. Essentially, the problem is that you have an array of large 12V lead-acid ...
0
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1answer
26 views

Series isolated DC-DC converters fed by different PV sources

I would like to have more detail about the description given by Vicor application note http://cdn.vicorpower.com/documents/application_notes/an1_high-vout.pdf: In a series array, the positive ...
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0answers
36 views

Is this design with Linear's LT3652 an efficient solution?

Related question I'm designing a solar charger with Linear's LT3652. Specifically, I chose this open source board from Sparkfun, that has a fine documentation. The IC starts from Vin ≧ 7,50V so I ...
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1answer
58 views

Is this a good layout for BQ40Z60-based battery management unit?

Could you please take a look at board layout and tell is there some stupid mistakes. I tried to accomplish the following characteristics: Max discharge current: 10A Max charge current: 5A Charge ...
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0answers
66 views

Step up 5v to -12v [on hold]

I need to supply an old device that requires +5v at 120mA, -12v at 50mA. I want use a single 5v power supply. Can I use for example https://www.pololu.com/product/2117 to output -12V?
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1answer
30 views

Buck vs boost, 12V LED strip with 5V micro and 240V AC

I would like to control a 2M 5050 12V warm white LED strip from a 3V3 or 5V micro controller, powered by a 240V wall outlet. To power both the LED strip and MCU from the same switch mode AC adapter "...
4
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3answers
206 views

Isolated DC/DC flyback/SEPIC

As far as I understand the flyback topology, it can be used in both buck and boost converters. What I am not sure about is: Does it also work for the case where buck-boost is needed, i.e. \$V_{\text{...
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2answers
42 views

Stepping up voltage from solar for a power brick (5V to 15V) possible?

i have a 28mAh power brick capable of charging my laptop when charged. I bought a 28W solar panel which outputs 5V over usb capable of charging ipads etc, however when i connected it to power brick's ...
1
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1answer
31 views

Simple Reverse-polarity Protection for Automotive DC-DC Converter: FET or Diode?

I have recently decided to upgrade my old van by installing a few 5V/3A sockets using a 100W 12V-to-5V downstep buck that has no reverse-polarity protection. A little bit of searching here and ...
2
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0answers
45 views

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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1answer
38 views

why do I need a pwm and H bridge, after a PID controller to feed a dc motor?

let's focus on current control. here's how I understood how the control works: (picture below) Basically I feed my PID with a reference current minus the measured current (i.e. I have a negative ...
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1answer
93 views

Raspberry 3.3 V to 5 V level conversion at 5MHz

I have a Raspberry Pi 2 to handle my cards. I need to convert 3.3 V GPIO of Raspberry to 5 V for my cards. Actually I use CD4050 (Non-Inverting Buffer) to convert 3.3 V to 5 V. I have mesaured ...
0
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1answer
53 views

Fan out in DC convertors

I know that Fan out is the maximum number of inputs that can be connected to a specific output. This limitation clearly affects data signals, but I don't know the case for power-supplying ICs. I have ...
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0answers
36 views

How best to convert 47V/3A solar source to 5 V 0.5 A output for USB?

What's the best way to charge a USB battery pack (5 V, 0.5 A) from a 47 V, 3 A solar panel? Just a simple PWM or MPPT charge controller?
3
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2answers
115 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 ...
3
votes
3answers
122 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 ...
0
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0answers
72 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
41 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
72 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 ...
0
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2answers
78 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 ...
0
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1answer
74 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 ...
0
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1answer
34 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 ...
1
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2answers
41 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 ...
0
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2answers
48 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(=...
0
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0answers
42 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 ...
0
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1answer
37 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 ...
0
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1answer
68 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. ...
1
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2answers
62 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
votes
1answer
52 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 ...
0
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2answers
74 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 $...
0
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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
76 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. ...
0
votes
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 ...
0
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1answer
101 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 ...
1
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2answers
83 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
76 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
77 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 ...
0
votes
2answers
67 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 ...
1
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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 ...
0
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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
votes
1answer
78 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 ...
1
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1answer
51 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 ...
-1
votes
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 ...
0
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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
86 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 ...