4
votes
Accepted
Output stage filter of a buck regulator and ESR
It makes me confused about what is really ESR. Whatever is ESR, it seems that It is varying according to the frequencies.
KEMET uses SPICE models to plot ESR and Impedance (Z) graphs. Following is ...
- 30.2k
4
votes
Accepted
Exploding/superhot capacitor in XT AC-DC PSU
The power supply schematic indicates this is a flyback converter, total output power rating = 80W (sum of output power rating of all rails), which is quite modest by today's standards. Your load, ...
- 1,522
3
votes
Output stage filter of a buck regulator and ESR
ESR is the effective series resistance. Note the word effective because, it isn't the actual internal series resistance (as seen at resonance) but, an equivalent series resistance representing all the ...
- 443k
3
votes
Accepted
Do non-polarized capacitors need to be in any type of orientation?
Both of those capacitors are polarized and must be installed in the correct orientation or they will go up in flames.
You have specified tantalum electrolytic parts which are different from those in ...
- 383k
2
votes
Output stage filter of a buck regulator and ESR
If you know either the self resonant frequency or ESR@120 Hz and ESL, I would model it as an ideal capacitor with series L and C. If the impedance plot is a nice V from the manufacturer or your own ...
- 13.7k
2
votes
Do I need a resistor in circuit when charging capacitors?
"Will the capacitors charge quick enough not to cause any harm?"
What do you mean by "not cause any harm"? very high peak currents for a short period may or may not cause damage to ...
- 6,604
2
votes
Exploding/superhot capacitor in XT AC-DC PSU
The circuits are unrelated in a sense, but also coupled through the flyback transformer.
Both of these caps were 1000uF 16V, maybe there is a design error or manufacturing error, and cap model not ...
- 136k
1
vote
Can a capacitor of lower capacity than required be harmful?
You will have a lot more ripple on the output under load. Whether that is a problem or not depends entirely on what the load is.
- 6,604
1
vote
Do non-polarized capacitors need to be in any type of orientation?
Well, they need to be in some kind of orientation where the contacts touch the pads...
If they're non-polarized (probably ceramic) the terminals can be positioned either way. Unfortunately, the spec ...
1
vote
Do I need a resistor in circuit when charging capacitors?
You can use a resistor in series after the rectifier bridge to charge the capacitor initially and later bypass using relays which is commonly used.
Other way is to use solid state static relays which ...
1
vote
Do I need a resistor in circuit when charging capacitors?
This depends on which phase of the network the capacitor begins to charge. The worst case is peak values, meaning that all the current will be applied to the ESR of said capacitor. In turn, this ESR ...
- 11
1
vote
Accepted
Can you replace ceramic or tantalum capacitors with aluminum electrolytic capacitors?
"Can" yes, there are situations where that can be done.
When, is the real question.
That question in turn, is answered jointly by these:
Ceramic (MLCC) versus Tantalum capacitors
Why do ...
- 27k
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