Introduction and Application of DC Supporting Capacitors

What is a DC-Link Capacitor and Its Main Application Areas?

DC-link capacitors are a type of passive component. They primarily use polypropylene film dielectric, which offers characteristics such as high voltage resistance, large current capacity, low impedance, low inductance, small capacitance loss, low leakage current, excellent temperature performance, fast charging and discharging, long lifespan (approximately 100,000 hours), good safety, anti-explosion stability, and easy non-polarized installation.

Main Application Areas of DC-Link Capacitors

DC-link capacitors are primarily used in the power electronics industry. Their applications include:

1. New Energy Industry: Photovoltaic inverters, wind power converters, etc.

2. Energy-Saving Industry: High-voltage frequency converters, etc.

3. Power Industry: Large high-frequency switching power supplies, uninterruptible power supplies (UPS), emergency power supplies (EPS), medium-frequency power supplies, DC regulated power supplies, electroplating power supplies, etc.

4. Power Quality Industry: Dynamic synchronous reactive compensators (SVG), active power filters (APF), etc.

5. Automotive Industry: Pure electric vehicles, hybrid vehicles, etc.

6. Electric Locomotive Industry: Locomotive traction converters, subways, high-speed railways, light rails, trams, etc.

Function of DC-Link Capacitors
DC-link capacitors are mainly used in inverter circuits to smooth and filter the output voltage of the rectifier. They absorb high-amplitude ripple from the inverter to the "DC link," preventing the DC load capacitors from being affected by the "DC link" impedance.

Well-Known Brands of DC-Link Capacitors
Internationally recognized brands include Electronicon, Epcos, and Eaco. Domestic brands include Shengdian, Faratronic, and Tongxin Electric, among others.

Conclusion
This article introduces the definition and related application areas of DC-link capacitors. For more in-depth information about such capacitors, you can visit Wuxi Power Filter Co., Ltd. for further details.