Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [ripple]

Small unwanted residual periodic variation of a direct current (dc) output.

The most common meaning of ripple in electronic is the small unwanted residual periodic variation of the direct current (dc) output of a power supply which has been derived from an alternating current (ac) source. This ripple is due to incomplete suppression of the alternating waveform within the power supply.

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Is there any downside to using a larger than needed smoothing capacitor?

I work with low-power DC voltage regulators. I am already aware of the formula to calculate the size of smoothing capacitor(s). This can be an iterative process of testing one size with a scope and then using a larger size or adding more until the…
PhilM
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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've understood that the filtering capacitor, for…
Luke__
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How does ripple degrade electrolytic capacitors?

How does excessive ripple current degrade electrolytic capacitors? What processes are involved and how do they work?
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Capacitor multiplier does not remove ripple

I'm trying to build a capacitor multiplier to remove ripple from a power supply. The power comes from a dc-to-dc converter (MC34063). The actual load is a circuit that has multiple modes of operation and it takes 2mA to 20mA. Fortunately enough, it…
nagylzs
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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 higher value of the capacitor will get better performance for suppressing ripple. Of…
curlywei
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Full-wave bridge rectifier with capacitor filter and ripple voltage

According to various sources, the ripple voltage of a full-wave bridge rectifier is $$ V_r = \frac{V_s}{2}fCR $$ where \$V_s\$ is the peak of the input voltage source, \$f\$ is the frequency, \$C\$ is the capacitor and \$R\$ the resistor. I have…
Douglas Edward
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What is a capacitor ripple current?

Suppose I have a simple full wave bridge rectifier, with resistive load. Is capacitor ripple current a charging or discharging current? Or maybe it is an avarage/RMS of any current flowing through a capacitor? On a picture below red is capacitor…
mactro
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Ripple reduction with LC filter

This seems like it must be a common problem but I don't find a clear answer anywhere, maybe my approach is wrong. I have a DC-DC regulator in my circuit, which has a ripple of 50mV at 200kHz, the current draw is 500mA, voltage output 5V. I want to…
sam
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How to improve current control loop in power supply?

I'm working on MCU programmable bench power supply. Its range is 0-50V and 0-3A programmed in 10mV and 10mA increments. It will be published as open hardware and source code that anyone can use it if find it usable. My "expertise" is more on…
prasimix
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Bridge rectifier circuit with a step-up transformer

I have been experimenting with a full-wave bridge rectifier in LTspice. I am trying to step up 120 V AC/60 Hz to 1 kV DC for a load of around 2 kΩ. The step-up transformer has a ratio of 25:9. The smoothing capacitor was calculated in order to have…
Dimitar Zhekov
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Does voltage ripple matter to a relay driven by a transformer?

If you have a relay that accepts actuation voltages of between 9-25V does it matter if you have a relatively large amount of ripple on that line? I ask because my design steps down 230V-15V with a transformer. I'm wondering whether a simple…
ScottishTapWater
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LTSpice voltage source understanding

I came across this Short Video on Youtube by MicroType Engineering, link here. His simulation on LTSpice was the below: I tried the simulation on LTSpice myself. However I am curious as to what the voltage means. I entered the following…
JoeyB
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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 (jelly bean) series regulators for…
EJE
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Designing a small footprint DC/DC converter

This is my first time diving into DC/DC converters, so I'm learning a lot of new information and am aware that I may miss some important details. I'm hoping that others with more experience could point out and educate me about those, why they are…
Mysterious Wolf
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Why is it suggested to power XOs with LDOs?

I've read in various places that crystal oscillator ICs require very clean power (as opposed e.g. to your usual 3.3V rail from some switching regulator) and one way to achieve that was via LDOs. (Ref1) However, the only thing that LDOs actually…
tobalt
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