All Questions
90
questions
1
vote
3
answers
2k
views
Buck converter based switching power supply?
simulate this circuit – Schematic created using CircuitLab
I have designed this circuit based on a buck converter. I'm just having trouble finding out which values to plug in. I.E. C1, L1, and ...
- 717
0
votes
1
answer
323
views
USB powered Switch Mode Li-ion Charger
I want to design a Switch Mode Li-ion charger which uses 5V as input and charges a single cell Li-ion cell.
I am referring this AppNote
On page 4 they have given the equation to find inductor value i....
- 483
0
votes
2
answers
1k
views
AC Power loss of inductor in a buck converter
I have a custom piece of equipment that gives a value for AC power loss (Pac) for an inductor plugged into an internal buck converter circuit. The custom equipment has an oscilloscope which is ...
- 314
3
votes
1
answer
992
views
Buck Converter Multiple inductors
I'm looking at a height constrained application, that's making it difficult to find the power inductors I need. What's wrong with say using 4 inductors in parallel to get more current? I know the ...
- 1,828
3
votes
1
answer
4k
views
Can a CM choke be used to suppress common mode current in a DC circuit?
I have a setup with a DC/DC converter like in the figure below. I need to minimize common mode current on the supply input.
There are no other connections besides Vsupply + and - and Rload + and -.
...
- 31
1
vote
1
answer
691
views
Can I measure inductor current by adding a secondary winding?
I have a buck converter and I want to add a current loop to it. I don't want to use a hall-effect sensor or something expensive like that. I think it is not practical to use a sensing resistor since ...
- 14.2k
1
vote
0
answers
159
views
Why output current shoots up by 10x
Here is my hand cranked generator for charging a high voltage capacitor. How the system is designed to work is shown in the following image:
It is designed to charge the 10 mF capacitor to upto 50 V ...
- 101
2
votes
1
answer
651
views
Buck converter design problem/confusion
I have problem with designing buck converter.
I have tried to design it by using instructions from this site:
Buck converter
And here are my parameters:
V input - 72V max
V output - 12 V
...
- 21
0
votes
3
answers
3k
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.
( ...
- 13
9
votes
1
answer
3k
views
Maximum limit on the Buck converter inductance value
I found the minimum inductor required for a buck converter using the following formula -
$$L_1 = \frac{V_{in\,max} - V_{out}}{I_o \times K_{ind}} \times
\frac{V_{out}}{V_{in\,max} \times fsw}...
- 1,398
15
votes
4
answers
11k
views
How do I select the correct inductor value for the following buck regulator?
First of all, I suck a bit at math, and I'm no electronics genius, so the stuff I do is for fun and for learning purposes...
I'm working on a buck converter circuit to convert my USB Vbus 5V to 3.3V. ...
- 3,660
2
votes
2
answers
3k
views
Does Inductor saturation current play an effect in SMPS design?
I am currently designing a DC-DC Buck power supply and now that I have chosen values for all my resistors and capacitors, I am looking for actual components. I was wondering if the saturation current ...
- 751
30
votes
4
answers
22k
views
Why do smaller loads require larger inductors in buck regulators?
The MC34063 Application Note lists the equation for calculating minimum inductor size as follows:
$$L_{min} = \frac{V_{in} - V_{sat} - V_{out}}{I_{pk}(switch)} t_{on}$$
But this implies that as Ipk(...
- 7,749
19
votes
6
answers
14k
views
Why do buck (step-down) switching regulators require an inductor and diode?
So, I understand, at least at a basic level, the method of operation of switching converters, both buck and boost. What puzzles me, though, is why buck converters in particular aren't simpler.
Why ...
- 7,749
18
votes
1
answer
17k
views
How important is self-resonant frequency for an inductor when used in a fast (~3MHz) buck SMPS?
I'm using the LM2734Z, a 3 MHz buck regulator. It's really fast which means it has a small inductor.
One of the things I'm wondering is how important is the self-resonant frequency of the inductor? I'...
- 32k