KEMET's New Generation DC-Link Film Capacitors
Miniaturization and Harsh Environment Withstanding
KEMET has recently introduced a new generation of power film caps for DC-link and DC filter applications. Thus, KEMET offers a wide range of different specifications with features such as miniaturization or harsh environment withstanding (THB 85°C/85% R.H./1,000hrs at VR; 135°C).
DC-link capacitors use thin polypropylene film as their dielectric and are found in power converter circuits between the input and output stages for DC smoothing and energy storage. The intermediate DC step allows noise-reduced power transfer when converting between AC sources of different power, voltage or frequency conditions.
And it stores energy to provide instantaneous current to downstream circuits and enables fail-safe power loss operations in some applications.
Typical Applications
- Power inverter like solar and wind
- Welding machines
- Motor drives
- On-Board charger
DC-link capacitors are often located in power inverters, motor drives and high-power charging circuits and are used as input/output filter as well. These capacitors are stable over temperature, frequency and time. They have a low dissipation factor, excellent self-healing capability and long operational lifetimes.
Key Requirements:
- DC-link capacitors must be able to withstand high power, high ripple currents and a large amount of charge/discharge cycles. They often experience high slew rates, which can be detrimental if a suitably robust capacitor is not selected.
- DC-link capacitors can be found in windmills, solar farms and other renewable energy source circuits they must operate reliably and safely in harsh environments.
Product Lineup of the Latest Series
C4AQ-M
Due to miniaturization C4AQ-M series allows more potential energy storage, better ripple and higher frequency performance (lower total ESL) or offers space savings.
Key Features:
- Miniaturized
- High dV/dt
- Highest peak & ripple current
- Lowest ESR
C4AU
With C4AU KEMET offers a THB grade IIIB tested power film capacitor for harsh environments.
Key Features:
- THB 85°C/85%/1000hrs/Vr
- High dV/dt
- High peak current
C4AK
C4AK offers the highest maximum temperature and the highest operation life of the lineup.
Key Features:
- Max. temperature 135°C
- Long life time 1000hrs@135°C/4000hrs@125°C
- THB 85°C/85%/1000hrs/Vr
C4AQ-P
C4AQ-P is a 125°C long life time version for higher currents and pulses.
Key Features:
- Long life time 4000hrs@125°C
- High dV/dt
- High peak current
The portfolio of those four new series offers a capacitance range from 1µF to 210µF and voltages of up to 1200Vdc @85°C. All series have AEC-Q200 certification and low profile versions are available.
Your Contact Person
For more information, please contact Roland Trimmel.
