0
How a can capacitor smoothen or reduce the ripple of the voltage produce by the rectifier?
Wiki User
∙ 11y ago
Rectifiers will not give a smooth DC voltage. There are ripples in the voltage given the rectifier. So in order to smoothen the voltage we use capacitor in parallel to the rectifier output.
Now lets see how the capacitor smoothen the voltage that is coming from a rectifier......
Capacitor blocks DC and allows AC......
If we take the voltage that is coming from the rectifier it has some ripples
in addition to DC, these ripples can be divided in to sinusoidal wave forms
( fictitious )according to the Fourier series. So the rippled DC now divided
( fictitious ) in to a pure DC and sinusoidal AC wave forms having the frequency that is multiples of ripple frequency.
Now the DC current will not pass through the capacitor as the capacitor blocks DC. But the AC will pass through it i.e the ripple wave forms that are divided ( fictitious ) in to sinusoidal AC wave forms will pass through the capacitor. So only DC current enters in to the load, which will produce a pure DC voltage drop across the load.
In this manner the capacitor smoothens the voltage.
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoMost people think of DC as having a steady voltage, but this is not always the case. This can happen for a variety of reason, but the main cause is AC to DC conversion.
A capacitor will charge or absorb electricity when the DC voltage is above the desired voltage, and then slow release its energy when the DC voltage is below the desired voltage. During the discharge, the capacitor becomes like a power source, and thus boosts the voltage. During charging, the capacitor acts like a load and helps to drop the voltage.
This boosting, and dropping is what smooths out the waveform.
Add your answer:
Earn +20 pts
What is the function of capacitor in full wave rectifier with smoothing capacitor circuit?
is a device that smoothen your half-wave rectification into a full-wave rectification after using a 4 diode and 1 resistor , after adding a capacitor , there will be a almost steady output , it charges the capacitor when is forward biased which is the first half wave , and discharge when is reverse biased to stablelize the wave into a almost same potential difference compare to a.c
How can a capacitor reduce the effects of ripple voltage?
The smoothing capacitor converts the full-wave rippled output of the rectifier (which is left over AC signal) into a smooth DC output voltage A smoothing capacitor after either a half-wave or full-wave rectifier will be charged up to the peak of the rectified a.c. Between peaks of the a.c. the stored voltage will drop by a degree dependent on how much current is drawn from it by the load. The larger the value of the capacitor, the less drop there will be, and therefore less ripple when loaded.
What happens to the output voltage of a rectifier if the capacitor becomes very leaky?
A leaky capacitor will act like a load therefore decreasing the DC and increasing ripple eventually the capacitor it will self destruct because of heating probaly taking out the rectifiers as well.
What is the function of a capacitor in the half wave rectification?
to smooth the output of the half-wave rectifier from 1/2 an AC cycle per period to a constant voltage.
Why is voltage rating of a capacitor important to the user?
The voltage rating of a capacitor tells the user how much voltage the capacitor can withstand. If a user exceeds this voltage, the capacitor's dielectric may be damaged and destroyed.
How can capacitor smooth or reduce the ripple of the voltage produced by the rectifier?
when rectifier is on, the capacitor is almost transparent (it charges to the voltage provided from the rectifier) when rectifier is off, capacitor holds the peak voltage since it stored a charge during rectifier on time.
How the capacitor removes the ripples from the rectified voltage?
During the AC cycle, the capacitor charges when the rectifier conducts, and maintains the voltage when the rectifier is not conducting.
Output voltage of half wave rectifier without capacitor filter is less or more than rectifier with capacitor filter?
less
If vm is maximum peak voltage of rectifier outputthis rectifier output is connected to the capacitor filterwhat will be the approximate dc output voltage to the capacitor filter?
It should be the rms value of your supply.
What is the function of capacitor in full wave rectifier with smoothing capacitor circuit?
is a device that smoothen your half-wave rectification into a full-wave rectification after using a 4 diode and 1 resistor , after adding a capacitor , there will be a almost steady output , it charges the capacitor when is forward biased which is the first half wave , and discharge when is reverse biased to stablelize the wave into a almost same potential difference compare to a.c
How do you determine the size of acapacitor in a rectifier circuit?
ANSWER In rectifiers for power supplies, the capacitor size is determined by the allowable ripple on the output. This can be determined by the rate at which the capacitor is drained. Specifically, this rate is the current drawn from the capacitor. Assume a half wave rectifier made from four diodes. For part of the cycle, the output current is supplied by the rectifier diode. This is also when the capacitor is charged. While the rectifier is not supplying current -- when the input waveform has dropped below the output voltage -- the capacitor must supply the current. Then, as the input waveform rises above the capacitor voltage, the rectifier supplies the current to charge the capacitor and the output circuit.
Why connect capacitor to alternator?
To help produce voltage.
How do you reduce a ripple voltage?
You reduce ripple voltage by adding a low-pass filter. In the simplest case, you put a capacitor after the rectifier. The peak voltage will be the rectifier output voltage less the forward bias of the rectifier, while the minimum voltage will depend on current and capacitance. In a more complex case, you could use an LC filter, making the peak voltage smaller. Specifics are dependent on the power and performance requirements.
How is the capacitor able to account for AC Ripples?
Ripple Voltage is voltage variation across the load and it is the AC component. To answer this question, consider a Half Wave rectifier with a smoothing capacitor: This rectifier will consist of a sinusoidal voltage source, an ideal diode, a capacitor in parallel with the load. At t=0, the voltage across capacitor = load voltage When the circuit is switched on, the capacitor is fully charged as the sinusoidal source reaches its peak. However, the sinusoidal nature causes the source voltage to decline after reaching the peak. This means that no current will flow through the diode. But the capacitor is still charged. So this will supply current to the load while it discharges. But during the discharging period (till the sinusoidal picks up again), the load voltage is an exponential function = peak voltage *exp-[(t - t')*resistance of load*capacitance] Now a key point is that the pulsating current is flowing through the diode to recharge the capacitor. Because of this constant charge and discharge of the capacitor in the cycle, the load voltage has AC ripples. At the same time load current is never zero and is directly prop to load voltage. The dc component >> ac component and the ripple voltage is greatly reduced by the capacitance esp a large one. You can minimize these by choosing a large capacitance. This is how a capacitor accounts for AC ripples. You can never actually rid these ripples even if you use a full-wave rectifier! Google search half - wave rectifier graphs on the ripples to understand this!! --- Sona
How can a capacitor reduce the effects of ripple voltage?
The smoothing capacitor converts the full-wave rippled output of the rectifier (which is left over AC signal) into a smooth DC output voltage A smoothing capacitor after either a half-wave or full-wave rectifier will be charged up to the peak of the rectified a.c. Between peaks of the a.c. the stored voltage will drop by a degree dependent on how much current is drawn from it by the load. The larger the value of the capacitor, the less drop there will be, and therefore less ripple when loaded.
What happens to the output voltage of a rectifier if the capacitor becomes very leaky?
A leaky capacitor will act like a load therefore decreasing the DC and increasing ripple eventually the capacitor it will self destruct because of heating probaly taking out the rectifiers as well.
What is the function of a capacitor in the half wave rectification?
to smooth the output of the half-wave rectifier from 1/2 an AC cycle per period to a constant voltage.
