All Questions
36
questions
0
votes
0
answers
47
views
Choosing filter capacitor and inductor for AC to DC rectifier
I am designing a three phase AC to DC rectifier. This DC output will be connected to a 6 IGBT bridge. That IGBT will be controlled using SVPWM technique to control a PMSM motor. What factors do I need ...
- 15.7k
1
vote
1
answer
83
views
DC bus capacitance design for SPWM inverter
I am working on a 5kW grid-connected inverter where I need to find the DC bus capacitance value. I understand that the capacitor serves 2 purposes: 1) to provide a low impedance path for the high ...
- 39.6k
4
votes
2
answers
3k
views
capacitor ripple current in buck converter
I'm designing a step-down buck converter and I'm a little bit worried about ripple current which flows through the output capacitors.
In my research on the internet I found that ripple current is ...
- 1
5
votes
3
answers
1k
views
Ripple rejection of capacitance multiplier when compared to linear regulators
There are some posts and discussions how a circuit popularly called a “capacitance multiplier” could reduce low frequency ripple noise (at 50/60 Hz or 100/120 Hz) and could perform better than common (...
- 4,330
2
votes
2
answers
135
views
Limits to number of parallel smoothing capacitors in a power supply
Would there be any disadvantage (other than a high component count) to using seven 470 μF, 16 V electrolytic capacitors instead of one 3300 μF, 16 V capacitor to smooth power supply ripple?
- 159k
12
votes
6
answers
5k
views
Ripple voltage filtering capacitor
I'm an self-taught high schooler who's trying to understand how filtering capacitors work. I've searched and read multiple websites trying to understand how filtering works. At the point where I am, I'...
- 14.5k
0
votes
1
answer
108
views
Is there a relationship between capacitor ripple current and the transformer secondary current output rating?
As an example: I was looking at a 10000 μF, 50 V capacitor with a ripple current rating of around 5 A at 20-120 Hz.
My transformer secondary is rated for 24 VAC, 20 A.
- 7,475
0
votes
1
answer
844
views
Why is an inductor rather than a capacitor used to smooth switch mode regulators
I understand (at least at a high level) how to use both capacitors and inductors to reduce noise but I don't understand the advantages/disadvantages of each approach or why one is chosen over the ...
- 72.5k
1
vote
3
answers
2k
views
Vdc in ripple factor
V_p(rect) is the rectified unfiltered peak voltage
V_r(pp) is the peak-to-peak voltage after filtering by a capacitor
Here is a picture:
V_r(pp) is given by the expression:
Which I have no problem ...
1
vote
0
answers
150
views
DC-link capacitor selection for electric vehicle
I'm currently trying to build a model of a three-phase inverter to be used in electric vehicles. The selection of a film DC-link capacitor is mainly dependent on the allowed voltage ripple, which is ...
- 15.7k
0
votes
1
answer
484
views
Buck Converter Voltage Ripple at Output
I just made a 32V to 16V 2 Amps buck converter with a 10mH inductor, I'm having an issue with the voltage ripple output. Too many spikes, and it's generally not consistent. Electrolytic and Film ...
- 46
3
votes
3
answers
33k
views
Rectifier ripple voltage formula
So I thought the ripple voltage was approximated by the formula
Vr,pp = Vp / fRC
for a half-wave rectifier, and Vp/2fRC for a full-wave.
Yet simulation shows ...
- 4,501
0
votes
3
answers
5k
views
For the capacitor specification "Ripple Current at Low Frequency" is a higher value better for a linear power supply?
I'm finding information that seems to be contradictory in various places, and I think people are talking about different ways of looking at the same spec.
The specification that Digikey uses to search/...
- 169k
8
votes
4
answers
2k
views
If cost can be ignored, is a higher-value capacitor for ripple suppression always a good choice?
To calculate what value of a capacitor is suited for ripple suppression,
we can use this formula:
Cmin = Load Current / (Ripple Voltage X Frequency)
It seems a ...
- 1,688
4
votes
3
answers
849
views
Capacitor as a ripple filter in the rectifier circuit - difference in charging and discharging time
Most of the times attached picture is used to depict the use of Capacitor as filter in the rectifier circuit. I guess, i understand the broad concept but I am struggling with the fact that charging ...
- 8,567