filter capacitor การใช้

• A rectifier and a filter capacitor were connected directly to the mains.
• LEDs are connected in parallel with the 10 ?F electrolytic filter capacitor.
• In old radios, the filter capacitors often fail, resulting in hum and distortion.
• The name illustrates the charging of the filter capacitor at the peaks of the AC voltage.
• Because areas near Niagara Falls had 25 Hz power, some Canadian sets had slightly larger filter capacitors.
• This meantime is defined by the grid side located filter capacitors have been discharged by the installed bleeding resistors.
• In some CRTs the aquadag coating performs a third function, as a filter capacitor for the high-voltage anode supply.
• The typical anode supply was a rectifier, perhaps half-wave, a choke ( inductor ) and a filter capacitor.
• The frequency of these pulse trains is then varied to produce the desired output voltage with the aid of the output filter capacitor.
• Although the capacitance is small, around 500 pF, due to the low anode current it is sufficient to act as a filter capacitor.
• Because, especially in digital signal processing, switching frequencies have continued to rise, the demand for high frequency decoupling or filter capacitors increases.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.