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What is the use of a capacitor for the correction of ripple factor?
Wiki User
∙ 13y ago
You get ripple in a power supply that is converting AC to DC because in a full-wave bridge the waveform, unfiltered, looks like a sine wave where the negative part of the cycle is flipped to positive. The Capacitor stores charge so its use helps keep the voltage from dropping so quickly to zero. The decay of the charge on the capacitor depends on the resistive load. If you could hold the highest voltage long enough before the next cycle voltage increased you would have no ripple. Various capacitor circuits, with other components, are used to reduce ripple to an acceptable range for an application.
Wiki User
∙ 13y ago
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How do you measure amplitude of a ripple?
Most true RMS voltmeters can measure the value of a ripple voltage on top of a DC supply, when you place it in AC mode. You can also place a small capacitor in series with a DC voltmeter and that would measure the ripple. The real way to do this, because ripple voltage is not sinusoidal, is to use an oscilloscope, particularly if you want the peak values.
Why you use capacitors in power supply?
You use a capacitor to store electrostatic energy. You use an inductor to store electromagnetic energy. You use a resistor to dissipate electrical energy.
What is the function of polarized capacitor?
Polar capacitor used in those places where the voltage will never switch polarity on them under proper use conditions. Their high capacitance means they can be used more effectively for power supply filtering, reducing ripple in a rectifier, and softening on/off switching.
How do you use a capacitor as a power saver?
You cannot use a capacitor as a 'power saver' or, more accurately, 'energy saver'! A capacitor may improve the power-factor of a load, and this may reduce the value of its load current, but this does not reduce the energy consumed by the load. For a residence, a so-called 'power save' capacitor is nothing more than a rip-off.
What are the differecne between chopper and rectifiers?
for controlling a motor if it is in a important application we use rectifiers because the ripple factor of the chopper is very high in comparison with choppers
Is a power factor capacitor different from a regular capacitor?
A power factor capacitor is a power capacitor. I'm not sure what you mean by "regular". There are different types, made from different materials that have better/worse characteristics than others depending on the application. You could use any high power capacitor for power factor correction, as long as it is sized correctly for the load and voltage.
How does a capacitor work in various industrial and domestic appliances and examples of capacitor in use?
Capacitor is connected parallel to the line which serves as power factor correction, increase line efficiency, voltage stability and reduced line losses and voltage drop.
What is a correction factor capacitor?
i know that static capacitors are used to improve the power factor. power factor should be high. Static capacitor supplies lagging reactive power. That means; the current I has 2 components they are magnetising Im (watless or waste current) and useful current Iw. Iw is in phase with voltage and Im is 90 degree away. Phase angle between them is phi 1. power factor is given by cosine of phi 1. phi angle should be less so that cosine of phi is high. To make phi angle less we use capacitor; this is nothing but power factor correction and capacitor used for this is called power factor correction capacitor. now when a capacitor is connected, it induces a current Ic 180 out of phase from Im and less in magnitude from Im. therefore, now the magnetising current is Im1=Im-Ic. due to this the phase angle reduces to phi 2. now the new power factor is cosine of phi 2. it is improved power factor.
Can the capacitor be inserted in series in order to improve the power factor?
In a circut we use capacitor in series for improving power factor
What is an RC filter for a ripple?
Place a capacitor across the output or load and you have your filter. This assumes that your load is a resistor. The capacitor you use depends on the frequency of the ripple. Lower frequencies require larger capacitors. A resistor may be required to make sure you do not damage any of the electronics either in series with the capacitor or immediately after the power source.
How do you differentiate a start capacitor from a run capacitor in air conditioner?
If the air conditioner has both, the run capacitor is likely the largest one. The start capacitor will only be in the circuit for a very short time, so overheating doesn't become an issue. The run capacitor must be sized for continual use.
How do you measure amplitude of a ripple?
Most true RMS voltmeters can measure the value of a ripple voltage on top of a DC supply, when you place it in AC mode. You can also place a small capacitor in series with a DC voltmeter and that would measure the ripple. The real way to do this, because ripple voltage is not sinusoidal, is to use an oscilloscope, particularly if you want the peak values.
Control diagrame of a capacitor bank and why you use capacitor banks?
---- Capacitor banks used to improve power factor(lagging) of a circuit:: This is necessary since it causes saving in power and electricity bill in following ways: 1) As p.f rises, circuit currnt decreases and hence I2R losses reduce 2) Var consumption reduces There is no tool provided here to draw the ckt diagram:: U take on PFC(power factor correction bus), then connect switch fuse, then HRC fuse, then Contactor, then overload relay and finally the capacitor bank
Why you use capacitors in power supply?
You use a capacitor to store electrostatic energy. You use an inductor to store electromagnetic energy. You use a resistor to dissipate electrical energy.
What is the difference between fltering and regulating diode application?
Filtering: When you see the output of a bridge rectifier fed with ac, you will find that the output is actually a dc + ac. The ac can be filtered out reasonably using a filter. The filters used often are capacitive input filters, and in its simplest form has just one capacitor. the capacitor charges to the peak value of the ac, and discharges when the diodes do not conduct, due to a fixed load. The capacitor is usually selected as 1000uF per ampere of load if a ripple of about 6V pp can be tolerated. For a low voltage supply (such as 9V), this is far too high, and one may use 3000uF/ amp of load current and get 2Vpp ripple, at mains of 60 Hz. the ripple frequency is twice, at 120 Hz. There is no regulating diode. One can have a regulator, and if it has large ripple rejection, one can use a lower value capacitor such as 1000uF for a 9V supply, and regulate the output to get a dc of 5V with low ripple of the order of 100mVpp or even lesser.
How many uf capacitor for using 6V 100amp rectifier?
To determine the required capacitance for a 6 volt 100 amp rectifier, you would need to know the ripple voltage that the circuit would tolerate. You would also need to know the ripple frequency. More specifically, you would need to know the time from one peak value to the intersection of the capacitor's voltage decay curve and the next turn on point for the rectifier.Let's say that the tolerated ripple voltage is 1 volt, and that the ripple frequency is 120 hertz, as provided by a full wave rectifier. This is a period of 8.3 millseconds. The actual time from ripple peak to ripple trough is actually slightly less than 8.3 millseconds, but that is a function of ripple slope, as somewhat complex calculation, so lets use 8.3 millseconds, which will be conservative.1 volt in 8.3 millseconds is 120 volts per second. Plug that in to the equation for a capacitor ...dv/dt = i/c..., along with the current of 100 ampere, solve for c and you get ...dv/dt = i/c120 = 100/cc = 100/120c = 0.83 faradsNow, 8.3 farads is a very large capacitor. Lets improve the situation with a three phase rectifier. In that case, the ripple frequency is 360 hertz, or 2.8 milliseconds, requiring a 0.28 farad capacitor, still a large value, but better than 0.83 farads.
What is the function of polarized capacitor?
Polar capacitor used in those places where the voltage will never switch polarity on them under proper use conditions. Their high capacitance means they can be used more effectively for power supply filtering, reducing ripple in a rectifier, and softening on/off switching.
