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An electrical component called a DC-link capacitor is used in power electronics to reduce voltage ripples in a DC power circuit. In a typical DC power circuit, the input voltage may come from a rectified AC source or straight from a DC source, but there may be some ripple voltage because of a variety of things, like the circuit’s inductances or the rectifier diodes’ less-than-ideal behaviour.
The purpose of a DC-link capacitor, which is linked in parallel to the DC power circuit, is to smooth out voltage ripple by storing energy during times of high voltage and releasing it during times of low voltage. The amount of voltage ripple that the power circuit can withstand, the current load, and the switching frequency are used to determine the capacitor’s capacitance value.
In many power electronics applications, including inverter circuits used in motor drives, uninterruptible power supplies (UPS), and renewable energy systems, among others, DC-link capacitors are frequently utilised. For power electronic systems to operate reliably and effectively, DC-link capacitors must be chosen, sized, and installed correctly.
Global dc-link capacitor market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
ModCapTM HF, a modular capacitor idea for DC link applications that can operate at extremely high switching frequencies, is offered by TDK Company.
The six newly created power capacitors in the B25647A series are rated for voltages between 900 and 1600 volts and have capacitance ranges between 640 and 1850 volts. The highest allowable hot spot temperature is 90 °C, and the rated currents range from 160 A to 210 A depending on the kind.
ModCap HF is especially well suited for fast-switching SiC-based inverters because to its ultra-low ESL value of only 8 nH and flat ESR vs Freq development that allows minimising losses even at high frequency.
When the current is turned off, the power semiconductors don’t experience voltage overshooting thanks to the extremely low self-inductance. As a result, snubber capacitors are typically not required.
