Because, especially in digital signal processing, switching frequencies have continued to rise, the demand for high frequency decoupling or filter capacitors increases.
12.
Electronic ballasts contain a small circuit board with a bridge rectifier, a filter capacitor and usually two switching transistors, which are often insulated-gate bipolar transistors.
13.
When the power factor correction ( PFC ) was required, those filter capacitors were replaced with higher-capacity ones, together with a coil installed in series to delay the inrush current.
14.
Low frequency oscillations like motorboating indicate that some device or circuit with a large time constant is involved, such as the interstage coupling capacitors or transformers, or the filter capacitors and supply transformer winding.
15.
Since the inductor current is never allowed to fall below zero, the output filter capacitor is not discharged and does not have to be recharged with every switching cycle to maintain the proper output voltage.
16.
In addition to limiting the total average power used by the device, the USB specification limits the inrush current ( i . e ., that used to charge decoupling and filter capacitors ) when the device is first connected.
17.
The increasing impedance of the filter capacitors at low frequencies can mean that low frequency swings in the current drawn by output stages can cause voltage swings in the power supply voltage which feed back to earlier stages, making the system a subaudio oscillator.
18.
Switching occurs at a very high frequency ( typically 10 kHz 1 MHz ), thereby enabling the use of transformers and filter capacitors that are much smaller, lighter, and less expensive than those found in linear power supplies operating at mains frequency.
19.
The predominant application of all electrolytic capacitors is in noise to the ground by bypassing the power supply lines, as backup capacitors to mitigate the drop in line voltage during sudden power demand or as filter capacitor in low-pass filter to reduce switching noises.
20.
Later the 1000-1 and 3000-1 models were introduced with provision for an external power using what was one of the first " wall wart " type power supplies-a transformer, rectifier, and filter capacitor in a box with AC line connector that plugged into and hung from the wall socket.
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