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DC-link Film Capacitor Suppliers


  • WDC series DC-Link Capacitor for PCB

    Features: Metallized polypropylene film Good electric property and high reliability Flame-resistant plastic case and epoxy resin (UL94 V-0, Non-PCB) sealing, tinned copper terminals lead out Low E.S.R., high current withstand capability, long service lifetime, and low failure rate 

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  • WDT series DC-Link Capacitor (Axial-Type)

    Features: Mylar tape or cylindrical plastic case, filled with flame-retardant epoxy resin The installation is flexible and convenient, and the way of extaction can be varied Noninductive structure, low ESL, small ESR, high frequency and high current capacity, low temperature, long life and other goo...

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  • WDF series DC-Link Capacitor (Dry-Type, Aluminum Case)

    Features: Aluminum housing package, filled with high temperature and high heat-conductive material Copper nut, copper screw extraction, and insulated plastic cover installation is simple and convenient, flame retardant High capacitance, small size, good self-healing property, high voltage proof Larg...

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  • WDB series Dry Type DC-Link Capacitor for Power Electronics (Steel Case)

    Features: Metal enclosure package This leads to the form of diverse choices High capacitance, small size Large ripple current, high DV/DT bearing capacity

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  • WDV series DC-Link Capacitor for EV

    Features: Special structure material design, self-healing, low loss angle, low equivalent series resistance, low temperature rise Stack-type bus leads to low inductance, are widely used in the IGBT style, direct mounting High temperature and high injection plastic perfusion, can long life work in hi...

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ABOUT US

Focused on Electronic Components Manufacturing for 20 Years.

Walson Electronics was established in 2001, with more than 20 years of experience in R&D, manufacturing, sale and service of film capacitors. We are Custom DC-link Film Capacitor Suppliers and Custom UPS Film Capacitor Manufacturers.

We always adhere to the cooperation of advanced automation and industrialization. the company continues to introduce domestic and foreign outstanding production equipment, while self-developed production management software, enterprise collaborative management to scientific and efficient operation, has achieved 1 billion/annual production capacity breakthrough, and maintains an orderly rise.

Walson Electronics products have covered more industries, including new energy and power industry, Photovoltaic inverters, LED lighting, household appliances and various power sources and other industries.

Adhering to the concept of innovative technology, honest service and professional quality, Walson Electronics pushes forward capacitor products continuously and is sure to become the industry pioneer with innovative advantages.

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  • Chairman - Zhenqiu An
    Chairman - Zhenqiu An
  • VP - Andrew An
    VP - Andrew An
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    Customer Service Team
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    Product Design
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    Walson Laboratory
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    Performance Test at Walson Laboratory
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Industry Knowledge

How do DC-link film capacitors differ from other capacitor types, such as electrolytic capacitors or ceramic capacitors, in terms of performance, reliability, and lifespan?

Dielectric Material:
DC-link film capacitors typically use a film dielectric material, such as polyester (PET), polypropylene (PP), or polyethylene terephthalate (PET), which offers high reliability, excellent self-healing properties, and long lifespan.
Electrolytic capacitors use an electrolyte solution as the dielectric, which can degrade over time, leading to increased ESR (Equivalent Series Resistance) and reduced capacitance. This can result in decreased performance and reliability over the capacitor's lifespan.
Ceramic capacitors use a ceramic material as the dielectric, which provides high stability and reliability but may have limited temperature and voltage ratings compared to film capacitors.
ESR and Ripple Current Handling:
DC-link film capacitors typically have lower ESR and higher ripple current handling capability compared to electrolytic capacitors. This makes them suitable for high-power applications with demanding ripple current requirements, such as motor drives and power inverters.
Ceramic capacitors also offer low ESR and high ripple current handling capability but may have limited capacitance values and voltage ratings compared to film capacitors.
Temperature Stability:
DC-link film capacitors exhibit excellent temperature stability over a wide operating temperature range, making them suitable for harsh environmental conditions and high-power applications.
Electrolytic capacitors may have limited temperature stability and can experience performance degradation at elevated temperatures.
Ceramic capacitors offer good temperature stability but may have reduced capacitance at high temperatures.

What thermal management techniques are employed to ensure proper heat dissipation and temperature stability in DC-link film capacitors operating under high-power conditions?

Thermal management is crucial for ensuring proper heat dissipation and temperature stability in DC-link film capacitors operating under high-power conditions. Several techniques are employed to manage heat effectively:
Selection of High-Temperature Materials: Choosing materials with high thermal conductivity and temperature resistance for the capacitor construction can enhance heat dissipation and improve temperature stability. For example, using metalized film with high thermal conductivity can help spread heat more efficiently within the capacitor.
Optimized Capacitor Design: Designing the capacitor with features such as increased surface area or fins can enhance heat dissipation. This can involve optimizing the capacitor's shape, size, and internal structure to maximize airflow and facilitate heat transfer.
Cooling Systems: Implementing active or passive cooling systems, such as fans, heat sinks, or thermal pads, can help dissipate heat generated during capacitor operation. These cooling systems can be integrated into the capacitor assembly or the surrounding electronic system to maintain optimal operating temperatures.
Placement and Mounting: Proper placement and mounting of DC-link film capacitors within the electronic system can also affect thermal management. Placing capacitors in locations with good airflow and minimal heat buildup can help dissipate heat more effectively. Additionally, using thermal interface materials between the capacitor and mounting surface can improve heat transfer.
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