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A switched capacitor is an electronic circuit element used for discrete time signal processing. It works by moving charges into and out of capacitors when switches are opened and closed. ...
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∙ 10y ago
Bhakta Kishor Behera
A switched-capacitor circuit is a discrete-time circuit that exploits the charge transfer in and out of a capacitor as controlled by switches. The switching activity is generally controlled by well-defined, non-overlapping clocks such that the charge transfer in and out is well defined and deterministic. These circuits can be thought of as a type of sample and hold circuit, where values are sampled and passed around through the circuit to achieve the desired functionality.
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Why Power factor becomes less lagging when capacitor is switched on?
Because capacitor withdraw leading current from source and net resultant become less lagging.
Why does the ratio of the voltage to current in capacitor and inductor depend on frequence?
The ratio of voltage to current, or the impedance, of reactive elements such as capacitors and inductors depends on the frequency of the applied wave because they store energy, and the amount of energy they store is directly related to the frequency of the applied waveform. When a DC voltage is applied to a capacitor, the current through the capacitor initially will be large, and will decay down to zero as the capacitor charges. Also, the voltage across the capacitor will be small initially and will increase over time to be equal to the applied voltage. This behavior results in a varying impedance when an AC waveform is applied. At a very low frequency, the capacitor will charge up and discharge similarly to if a DC source was switched into the capacitor for a long period of time there would be a large voltage drop, and small current = high impedance). As the frequency increases, the capacitor will appear more like a DC source was initially switched into the capacitor (low voltage drop and high current = low impedance).
What is dc link capacitor?
when the DC current flows through the capacitor .the leakage of the charges is in capacitor called Dc leakage capacitor .
Why do you connect a capacitor to an AC motor?
To induce a phase shift between the rotor and stator (stationary winding). AC motors are not good at starting up, they need 'help' to get started/they need two magnetic fields to push against each other to generate torque. This capacitor is called a 'starting' capacitor and provides an extra 'boost' to get the motor turning by increasing the phase angle between the rotor and stator winding. Once the motor is at it's proper operating speed, the capacitor must be disconnected or it will burn up. There are also motor designs that use a run capacitor. This capacitor usually has a smaller capacitance than a start capacitor (so it provides a smaller phase shift), but is designed for continuous operation. These motors don't provide as much starting torque as a similar motor with a start capacitor. Other motors will have both a start and run capacitor. The start capacitor provides significant phase shift between the rotor and stator, and thus significant torque. Once the motor is at speed, the start capacitor is switched out of the circuit, and the run capacitor is left in the circuit to provide a smaller phase shift.
What is the differencebetween a run capacitor and start capacitor?
The run capacitor is used when the load is functional while the start capacitor is used to produce the initial torque to drive the load.
Will a capacitor discharge in a open switch?
if the source is switched off there will be leakage slowly discharging the capacitor
Operation of commutating capacitor?
Commutation Capacitors are usually switched in parallel to the thyristors.
When an Electric motor or Generator is switched on what will make the coil turns the opposite way?
if it is a capacitor start and run motor, this is because of shorted capacitor
What has the author James Edward Hansen written?
James Edward Hansen has written: 'A time-multiplexed switched-capacitor circuit for neural network applications' -- subject(s): Neural networks (Computer science), Switched capacitor circuits
What has the author August Kaelin written?
August Kaelin has written: 'Contributions to the exact design of switched-capacitor filters with emphasis on modular structures and dynamic range' -- subject(s): Design and construction, Electric filters, Switched capacitor circuits
Why Power factor becomes less lagging when capacitor is switched on?
Because capacitor withdraw leading current from source and net resultant become less lagging.
What has the author Xerxes F Wania written?
Xerxes F. Wania has written: 'Programmable multiplexed switched-capacitor filters'
Sir iam a working engineeri have come to a peculier problem the capacitor bank was installed at a sub-stationwhen capacitor bank is switched on the power factor becomes more lagging?
It's not peculiar. That's a property of capacitors.
What has the author Howard M Sandler written?
Howard M. Sandler has written: 'Programmable switched-capacitor low-pass ladder filters'
What has the author DL Goodman written?
D.L Goodman has written: '16-bit digital filter interface using switched capacitor filters'
What has the author Sam Crapanzano written?
Sam Crapanzano has written: 'A 2V fully-differential switched-capacitor integrator technique in standard CMOS'
Why does the ratio of the voltage to current in capacitor and inductor depend on frequence?
The ratio of voltage to current, or the impedance, of reactive elements such as capacitors and inductors depends on the frequency of the applied wave because they store energy, and the amount of energy they store is directly related to the frequency of the applied waveform. When a DC voltage is applied to a capacitor, the current through the capacitor initially will be large, and will decay down to zero as the capacitor charges. Also, the voltage across the capacitor will be small initially and will increase over time to be equal to the applied voltage. This behavior results in a varying impedance when an AC waveform is applied. At a very low frequency, the capacitor will charge up and discharge similarly to if a DC source was switched into the capacitor for a long period of time there would be a large voltage drop, and small current = high impedance). As the frequency increases, the capacitor will appear more like a DC source was initially switched into the capacitor (low voltage drop and high current = low impedance).
