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
votes
0answers
19 views

How do I calculate inductor and capacitor values for a KY and SEPIC converter? [on hold]

I am doing my work on KY converter and SEPIC converter. And I have planned to integrate both the converters. Now I need the formulas for the calculation of inductor and capacitor values for both the ...
0
votes
4answers
80 views

Solar panel and dc motor

I want to run a 130V dc motor 2hp. I have 6 solar panel 120V dc out. I connected them in series to the motor directly and it runs, but when I check the voltage at the terminal when it is running it ...
-3
votes
1answer
70 views

How to the calculate the value of capacitor placed in series with transformer to avoid flux walking in a buck converter? [closed]

The dc value of current in primary increases(in -ve direction) as time passes, so I need a capacitor in series with transformer, but don't know what value capacitor should I use. filter capacitor = ...
1
vote
3answers
37 views

Operation of PC817

I am studying a DC-DC converter circuit design which has PC817 photocoupler in it. I am confused with the way PC817 behaves. My friend says that it is an analog photocoupler. I have tested it myself ...
1
vote
0answers
74 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), ...
0
votes
1answer
56 views

How create a low-voltage boost (~4v to 5v)

I am looking for a circuit that will go from a Li battery that has a voltage between 3.6v and 4.3v up to 5v - and I have seen similar questions such as this and this, but those just recommend ...
1
vote
2answers
87 views

How to get 12V from 9.5-13.9V source

I have couple of lead acid battery reserved power supplies with output voltage from 9.5 (battery discharge cutoff) up to 13.9 (while charging the battery), intended for use with CCTV cameras, but ...
0
votes
1answer
65 views

Topology for a DC-DC step up converter for a single AA battery with 50V 10mA output

I need to design a very compact step up DC-DC converter for the single AA battery (input voltage 0.7-1-5V) with an output of 50V 10mA. The load should drain in a typical case about 2mA, but in certain ...
3
votes
3answers
231 views

Ways to isolate DC power source

I need to isolate my circuit from the power source of 5V dc. Since this is for medical use, and the device is powered by USB, the isolation needs to be at least 4kVrms, 5mm clearance, 8mm creapage ...
0
votes
1answer
35 views

Function of UCC2813-1 in flyback converter

I am studying a design of a fly back DC-DC converter. It is based on TL431 voltage regulator with PC817 opto-coupler. I heard that it is a popular design used. Switching PWM pulses are generated ...
0
votes
1answer
35 views

Inductances in flyback transformer

I am simulating flyback dc-dc converter in multisim software tool .. I want to know the difference betweem primary inductance and magnetising inductance , also secondary leakage inductance?
0
votes
2answers
72 views

Can I power Ardiuno using buck converter IC 3485 or any other buck circuit?

A buck circuit lowers the voltage by generating pulses at a certain duty cycle. Is it okay to give this pulsing voltage to Arduino? Can Arduino work normally with this? I have 12V battery and I want ...
0
votes
0answers
16 views

Noise in Inductor Current : Buck Converter [duplicate]

Source DC: 300v DC Output DC required : 160v DC Load Current : 7A DC Buck Converter Topology : IGBT as switch @ 8khz 1.1 mH Ferrite Core Inductor Measured Inductor Current ...
0
votes
1answer
83 views

12V DC to 220V DC Boost Converter

This is a circuit I am reviewing to generate 12V DC to 220V DC (output). At what component configuration can this circuit generate such output. The goal is to be able to at least supply 70 Watts of ...
-1
votes
3answers
114 views

Spikes in Inductor Current : Buck Converter

What could be the reason of such spikes in inductor current at each Switch ON-OFF. ?? This spikes are also getting affected in load current. Please help me to reduce / remove this spikes. ( ...
0
votes
1answer
40 views

Dc Dc regulator malfunction

I am using the BD9C401EFJ chip for stepping 8.5V to 5V. The system is as stated - 1) I am supplying 8.5V from a bench power supply -> (to) BD9C401EFJ -> (output) 5V ->FT440G (another dc dc regulator) ...
0
votes
1answer
61 views

PWM Dimming results in input ripple due to excessive inrush current

I use a constant current SEPIC boost regulator ([TI LM3410X) to run a 8.5V 400mA OLED panel from a single Cell Lithium polymer battery. I have noticed that the input voltage ripple is too much (~1V ...
1
vote
2answers
99 views

Using Li-Ion battery while charging

I'm trying to design a custom intelligent electronic cigarette battery, but I'm more of a programming guy. I know basic electronics, but I need some help with the details. I've sketched up an outline ...
0
votes
0answers
68 views

Poor output efficiency of SEPIC supercap driver

I'm attempting to drive a high power led (3.6V, 700mA, nominal power 3W) from a 5.4V 3F supercapacitor via a SEPIC (see this question). While I don't have any strict design requirements, a running ...
1
vote
2answers
42 views

Problem with stepup BOOST converter

I'm using LM3478 converter to convert 12V to 30V in standard circuit for 456kHz. Circuit was working perfectly but when I was measuring something I demaged probably LM3478. I replaced it with new IC ...
1
vote
4answers
162 views

How to drop 240V DC to 5V DC

I would like to drop a 240V DC voltage to a 5V DC voltage to supply electronic. The 5V stage needs less than 5mA in current. The solutions I looked at are: Resistor divider (Not really ...
0
votes
2answers
49 views

How to theoretically determine ESR of a capacitor and DCR of an inductor for a buck converter?

How can we determine ESR of the capacitor and DCR of inductor theoretically in the design of buck converter, without using an LCR meter?
1
vote
3answers
143 views

D.C volt regulator

Summary: I have a solar panel whose output is intended for use with a 12V system. The actual output voltage under light load or no load rises to nearly 20V in bright sunlight. I wish to obtain ...
0
votes
1answer
92 views

I have a not working LED driver IC

I'm currently using a boost mode constant current LED driver IC LM3424. I used a MCU to PWM dimming the brightness of the LED, and schematic of LM3424 part is almost the same as it in LM3424 ...
1
vote
1answer
73 views

What is the best way to power both my 5v 16 x 16 Neopixel matrix and the 9v Arduino that drives it? [closed]

I have 4 Adafruit 8x8 Neopixel matrices interconnected to form a 16 x 16 matrix driven by an Arduino Mega. Right now I am using two different power sources to power the matrix and the microcontroller. ...
1
vote
0answers
74 views

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 ...
1
vote
3answers
121 views

Make 5kV, 0.001A (5W) step-up from 12V?

I have faced that problem: 9-15V Vin (12V accu) and 5kV, 0.001A out (5W) and dont know how to solve that, i tried to use push-pull SG3525 but efficiency is very poor, about 20-30%. Can someone suggest ...
3
votes
1answer
70 views

RGB led driver maximum current

I am planning to build a device that includes an high power RGB LED (either a lightsaber or a decorative object for the girlfriend - I still have to decide), where high power means about 3x3W. I've ...
1
vote
1answer
72 views

Best method to eliminate alternator whine from a 12V line?

I've purchased a Miccus Mini-Jack Rx BlueTooth audio receiver. This device will accept a bluetooth signal from my phone and output it to a headphone jack that I plug into the AUX-In on my car stereo. ...
0
votes
0answers
44 views

What is edge resonant soft switching?

I am doing my project in DC-DC converters. The topic is Edge-Resonant Switched Capacitor Cell-Assisted Soft-Switching PWM Boost DC–DC Converter. I am confused about the idea of edge resonance. What is ...
0
votes
1answer
59 views

Most efficient way to convert multiple voltages?

I'm driving a rgb led strip and an arduino from a variable power supply between 12-15 volts. So I'm looking at a buck converter for the 12v led's but I need 5v for the arduino as well. There must be a ...
2
votes
4answers
369 views

How to make a step down DC-DC converter fail safe?

I'm planning to power some high power colored LEDs with a buck converter, using a microcontroller to control the switching to maintain a constant current. I'm also considering a simpler, switched ...
1
vote
2answers
270 views

LM317T not working properly?

I am using an LM317T, trying to use it to create a constant 5v output. I've wired it from the diagram shown here. I am using a pot trimmer to control R2. As far as I can tell, it's wired properly ...
0
votes
1answer
114 views

7.4v DC to 5v DC (with 1A and 2A options)

I am trying to make a power bank out of the cells of a laptop battery. Each cells are 3.7V 2200mAh .I tried using a 7805 voltage regulator with the two cells in series, but the output current was not ...
1
vote
0answers
71 views

DIY buck-boost converter clarifications and research review

I want to make my own buck-boost converter! After watching this video, I got a basic understanding on how it works, and I made some analysis on this scheme: simulate this circuit – ...
1
vote
2answers
102 views

DC-DC converter to drive DC motor

In a robotics application I have to install a 12V (30A) DC motor actuator in a vehicle. The typical setup indicated by the manufacturer is to directly connect it to the battery, because of inrush ...
0
votes
0answers
53 views

Photovoltaic Panel Power On a PC Fan

I've built a simple circuit with a 3V solar panel, an LT 1301 to step up the 3V of the solar panel to the 12V needed to start my 8cm PC fan and obviously, the 8cm fan. Everything works fine, but in ...
2
votes
2answers
159 views

IC boost converter performs poorly in breadboard prototype circuit: is this to be expected?

I'm using a TLV61220 IC boost converter to get 3.3V from a 1.5V AAA battery. I've built the circuit as specified on the datasheet (p. 1 of http://www.ti.com/lit/ds/symlink/tlv61220.pdf) with R1 at 1MΩ ...
3
votes
1answer
32 views

Murata NCS6D1215C DC/DC converter for +15V and -15V

I would like to know if I can use a Murata NCS6D1215C DC/DC converter with a 12V battery to provide the necessary +15V and -15V for a power supply and amplifier that together require 200mA. The last ...
1
vote
2answers
101 views

DC-DC converter wrong output voltage

I needed a reasonably stable 6.2V power supply for my audio amplifier project. I've found a few AIC1563PN dc-dc converters (looks identical to MC34063 according to the datasheet) which I salvaged from ...
1
vote
1answer
66 views

AP3431 burning up with no load on it

EDIT 1: I was able to get it to work, but I am not at all sure what happened here... I decided to build this circuit again - exactly the same layout and parts (see original question below). As soon ...
1
vote
1answer
83 views

Strange oscillation in buck converter (AP3431)

I am having a lot of trouble getting AP3431 to work reliably. The converter works properly for about 30 seconds, and then oscillations begin, with brief periods of normal function. Here is how it is ...
2
votes
1answer
59 views

Question about current output of a DC-DC stepdown converter

If we have a solar panel of 5V and we want to keep voltage on the output to 3V, what current we are getting on the output? The same as in the input? Or a different one?
2
votes
2answers
101 views

High-voltage capacitors in space

I'm currently designing an high voltage DC/DC converter, from a linear technology app-note. My goal is to bias an avalanche photodiode with 200 to 300V, on a small educational satellite. I picked the ...
1
vote
3answers
357 views

Powering RGB Leds from 2 AA batteries

For a hobby project I'm trying to power a PIC microcontroller and 4 RGB leds from two AA batteries. I have both the PIC and the circuit shown below being powered by the batteries and the PIC ...
2
votes
1answer
113 views

Why my boost converter is not working?

I am trying to get a boost converter working. This is the schematic: simulate this circuit – Schematic created using CircuitLab The clock signal is 12V and 100KHz, the output capacitor ...
1
vote
1answer
53 views

Shifted GNDA in Series DC/DC Converter

I have 13 \$\pm 15V \$ DC/DC converters and 1 \$\pm 5V\$ DC/DC converters which I am connecting in series to generate a \$\pm 200V\$ output giving a total output range of 400V. The problem is what ...
2
votes
2answers
151 views

MOSFET Gate Series Resistance Guidlines

I am trying to choose a series resistor for a MOSFET (PSMN1R5-25YL) in order to reduce ringing, and I wish to know the guidelines for choosing the right resistance. I'm not sure if it's relevant, but ...
1
vote
0answers
142 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 ...
2
votes
1answer
104 views

Series Connection of DC/DC Converters

I am trying to connect 4 +12V DC/DC converters in series. Please let me know how can this be done. What are the connections to be made and to what pins? I am using Traco Power TEN 5-1223 which has ...