The scope of application for DC capacitors is similarly diverse:
Smoothing capacitors serve for the reduction of the AC component of fluctuating DC voltage, e.g., in power supplies in radio and television technology (transmitters,) high-voltage testing
equipment, DC controllers, measurement and control technology, cascaded circuits for generation of high DC voltage a.m.o. Supporting capacitors, DC-Filter or buffer circuit capacitors are used for
energy storage in intermediate DC circuits, e.g. in frequency converters for poly-phase drives, transistor and thyristor converters. They must be able to absorb and release very high currents
within short periods, the peak value of the current being substantially greater than the rms value. Surge (Pulse) discharge capacitors are also capable of supplying or absorbing extreme short-time
current surges. They are usually operated in discharge applications with non-reversing voltages, and at low repetition frequencies, e.g. in laser technology and lightning generators.
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AC capacitors serve as damping or snubber capacitors connected in series with a resistor, and are designed for the damping of undesirable voltage spikes caused by the so-called carrier storage effect during the switching of power semiconductors. When applied as commutation capacitors, they are switched in parallel to a thyristor and designed to quench its conductive state. Since commutating capacitors are periodically and abruptly recharged,the peak current will substantially exceed the rms value. Further, AC capacitors are used in low-detuned or close-tuned filter circuits for filtering or absorbing harmonics. As pulse discharge capacitors, they are useful in applications with reversing voltages, e.g. in magnetizing equipment. |
Capacitors for power electronics can be used for a wide variety of applications |
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