In the field of electronic components, film capacitors serve as fundamental elements whose internal structure decisively influences performance. Against the backdrop of increasingly sophisticated electronic equipment, correctly selecting film capacitor types directly affects the stability and efficiency of the entire system.
Based on different internal structures, film capacitors are mainly divided into two categories: wound type and stacked type. Understanding the core differences between these two capacitor types is crucial for electronic engineers to make correct component selection decisions.
Film capacitors use polymer films as dielectric materials and are renowned for their non-polarity, high insulation resistance, excellent frequency characteristics, and low dielectric loss. In recent years, metallized film technology has become mainstream, significantly improving capacitor performance density by vacuum-depositing a thin layer of metal onto plastic films as electrodes.
Film capacitors can quickly store and release energy while blocking low-frequency signals, making them widely used in the electronics industry. From a structural perspective, film capacitors are mainly divided into "wound type" and "stacked type" categories, and this structural difference directly affects the capacitor's performance and application scenarios.
Structural Principle Comparison
Wound film capacitors adopt a basic structure where metal electrodes and plastic dielectric films are overlapped from both ends and wound into cylindrical shapes. This structure resembles making a "rolled pancake," ensuring structural consistency through precise control of winding tension.
Stacked film capacitors employ a completely different structural concept, stacking multiple layers of polymer films and metal foils together, forming an internal structure similar to a "thousand-layer cake." This structure requires more precise interlayer alignment technology.
|
Characteristic |
Wound Film Capacitors |
Stacked Film Capacitors |
|
Production Process |
Mature and stable, high automation |
Complex and expensive equipment, difficult process |
|
Production Cost |
Relatively low, cost-effective |
Higher cost, expensive |
|
High-Frequency Characteristics |
Good performance in non-inductive type, suitable for medium-high frequency |
Excellent frequency characteristics, suitable for high-frequency applications |
|
Capacity Density |
Small size, light weight |
Higher capacity density, better volume efficiency |
|
Parasitic Inductance |
Higher in inductive type, lower in non-inductive type |
Very low, small high-frequency impedance |
|
Current Withstanding |
Strong (especially in foil electrode type) |
Medium level |
|
Temperature Stability |
Stable performance over wide temperature range |
Good temperature characteristics |
|
Self-Healing Capability |
Excellent self-healing characteristics |
Limited self-healing capability |
|
Reliability Record |
Long-term market verification |
Reliability depends on process control |
|
Applicable Frequency Range |
Medium-low to high frequency |
High to ultra-high frequency |
From the perspective of market prevalence, wound film capacitors dominate the current film capacitor market due to their mature technology and excellent cost-effectiveness. Although stacked film capacitors have advantages in specific high-frequency fields, they have become relatively rare in the market due to complex production processes and high costs.
Based on the above comparison, the wound structure demonstrates significant advantages in multiple aspects:
-Mature and Reliable Production System
The production process for wound film capacitors has developed over decades, forming a standardized, automated production flow. UFCapacitor uses advanced winding equipment to ensure each product maintains consistent high quality.
-Excellent Electrical Performance
Low loss characteristics: Helps improve overall system efficiency
High capacity stability: Maintains stable capacitance under different operating conditions
Low leakage current: Effectively reduces circuit power consumption and noise
-Broad Temperature Adaptability
Wound film capacitors exhibit outstanding temperature stability, capable of normal operation within a wide temperature range from -55℃ to +105℃, meeting usage requirements in various harsh environments.
-Perfect Balance Between Economy and Reliability
Wound film capacitors achieve the optimal balance between performance and cost, providing users with cost-effective choices. Combined with their long service life and high reliability, the total cost of ownership is significantly reduced.
UFCapacitor's wound film capacitors combine the reliability of mature structures with the latest advances in cutting-edge technology, providing stable performance and long service life capacitor solutions for various electronic applications.
Power electronics field: Frequency converters, industrial drives, UPS, photovoltaic inverters
Automotive electronics: On-board chargers, EV charging systems, Car air conditioner
Consumer electronics: Communication equipment, computers, home appliances, lighting electronics
Visit https://www.ufcapacitors.com to learn detailed product information. Our technical team is always ready to provide professional selection support.
Cross to:
|
Photo |
Description |
UF Series Code |
Vishay |
Kemet |
Faratronic |
|
|
Metallized Polyester |
CL21 Series |
MKT368 Series |
*** |
C21 Series |
|
|
Box Type Metallized Polyester Film Capacitor |
CL21B Series |
MKT371 Series |
R66 Series |
C23 Series |
|
|
Metallized Polypropylene Capacitor |
CBB21 Series |
*** |
*** |
C31 Series |
|
|
Box Type Metallized Polypropylene film Capacitor |
CBB21B Series |
MKP385（DC） Series |
F461 Series |
C32（MKP21）Series |
|
|
X2 Metallized Polypropylene Film Capacitor |
X2 Series |
|
R46 Series |
C42(E)MKP62 Series |
