KCX

KCX Series: Ultra-Miniature High-Voltage Aluminum Electrolytic Capacitors Designed for High-Efficiency Fast Charging and High-Reliability Power Supplies

In today's electronic devices that strive for ultimate efficiency and power density, power supply design, especially for consumer-facing fast chargers, faces multiple challenges related to size, efficiency, cost, and reliability. YMIN, deeply understanding this market need, has launched the KCX series of radially led aluminum electrolytic capacitors.

More than just an electronic component, it is a high-performance solution tailored for PD (Power Delivery) fast charging power supplies, adapters, and various high-density switching power supplies (SMPS). The KCX series' core selling points are its ultra-miniaturization, high voltage withstand, long lifespan, low impedance, and excellent shock resistance, aiming to help engineers build efficient, stable, and durable power systems within compact spaces.

I. Precise Market Positioning: Addressing the Core Pain Points of Fast Charging Power Supplies

The KCX series was developed in response to several core challenges faced by modern power supplies, particularly high-frequency, high-efficiency fast charging solutions led by gallium nitride (GaN) and silicon carbide (SiC) technologies:

• Space Constraints: As mobile phone and laptop chargers become increasingly smaller, space is extremely limited for internal component placement. The KCX series offers a variety of ultra-small package options (e.g., 6.3x12mm, 8x10mm) from 5mm to 18mm in diameter, allowing for easy embedding into extremely compact PCBs. This provides ample space for larger components such as transformers and main control chips, forming the cornerstone for achieving "small size, high power" fast charging designs.

• High Voltage and High Reliability Requirements: The primary-side rectification and filtering in fast charging circuits requires capacitors capable of withstanding high voltage stress and frequent switching surges. The KCX series offers high rated voltage options of 400V, 450V, and even 500V, providing a robust voltage buffer barrier for the primary side of the power supply. This effectively copes with grid fluctuations and high-voltage spikes generated during switching, ensuring the safety of downstream circuits.

• Performance Requirements at Higher Frequency: GaN technology significantly increases switching frequencies, meaning that traditional electrolytic capacitors may suffer from severe heat generation and efficiency loss due to excessively high equivalent series resistance (ESR). The KCX series, through optimized manufacturing processes, achieves low impedance characteristics at high frequencies, ensuring efficient filtering and low self-loss even in high-frequency switching environments, thereby improving overall efficiency and reducing temperature rise.

II. Superior Product Features: Building a Solid Defense for Power Supply Reliability

Every technical parameter of the KCX series has been meticulously optimized for high-reliability applications:

1. Robust Long-Life Design: The KCX series provides a load life guarantee of 2000 hours (for products with a diameter ≤ Φ6.3mm) to 3000 hours (for products with a diameter ≥ Φ8mm) in harsh operating environments up to 105°C. This lifespan rating fully meets the long-term stability requirements of consumer power products, ensuring the charger's durability under high-frequency daily use and reducing the risk of premature failure due to capacitor aging.

2. Enhanced Lightning Stroke Resistance and Ultra-Low Leakage Current: The product is clearly labeled "Anti-Thunder Stroke," indicating its excellent surge protection capability. It can withstand the instantaneous high-voltage surges that may be introduced into the power grid during thunderstorms, enhancing the device's adaptability to complex power environments. Simultaneously, its leakage current is strictly controlled to an extremely low level (≤0.015CV+10μA), which is crucial for reducing the device's standby power consumption and helps easily meet increasingly stringent global energy efficiency regulations (such as CoC V5, DoE Level VI), adding points for green certification in product exports.

3. High Ripple Current Withstand Capability and Low ESR: As a filter capacitor, the ability to withstand ripple current directly affects its operating temperature and lifespan. The high ripple current rating of the KCX series means it can effectively handle the high-frequency current ripple generated by switching power supplies, with low self-heating and more stable operation. Combined with its low ESR characteristics, this ensures the purity and stability of the voltage at full load output, providing high-quality energy to the load devices.

4. Stable performance over a wide temperature range: KCX boasts a wide operating temperature range of -40°C to +105°C. Its temperature characteristics show that even at -40°C, its impedance ratio (Z(-40°C)/Z(20°C)) remains within a reasonable range (e.g., 7 for 400V products), ensuring stable startup performance and normal operation in cold environments, thus broadening its applicability to various regions.

5. Strict quality and consistency control: After 1000 hours of no-load storage at 105°C and durability testing under rated conditions, the KCX series' key parameters, such as capacitance variation, loss tangent (tanδ), and leakage current, are all limited to strict standards (e.g., capacitance variation ±20%). This ensures that every KCX capacitor in mass production has highly consistent and reliable performance, providing quality assurance for large-scale power supply manufacturing.

III. Wide Range of Applications: Diverse Solutions Beyond Fast Charging

While the KCX series is optimized for fast charging, its superior performance allows it to excel in multiple fields:

• PD/GaN Fast Chargers: This is the core application area for the KCX series. As a rectifier and filter on the primary side, it provides smooth DC power to high-frequency switching power supplies. Its miniaturization and high performance are key to achieving 100-watt-level power output in a lipstick-sized form factor.

• Industrial Power Supplies and Adapters: Power adapters for network equipment, monitoring systems, smart home products, etc., use KCX's high reliability to ensure a stable power supply for these devices that require long-term uninterrupted operation.

• LED Drivers: In the driver circuits of high-power LED lighting and smart lamps, KCX provides stable filtering, reduces flicker, and extends lamp life.

• Automotive Electronic Accessories: Such as on-board chargers and on-board inverters, KCX's wide temperature range and vibration resistance characteristics allow it to adapt to the harsh working environment inside vehicles.

IV. Environmental and Safety Standards

The KCX series fully complies with the RoHS directive, reflecting YMIN's commitment to environmental protection. Its casing features an explosion-proof valve design, providing additional safety assurance and preventing safety hazards caused by excessive internal pressure under extreme abnormal conditions.

Conclusion

The YMIN KCX series aluminum electrolytic capacitors, with their deeply optimized design for fast-charging power supplies, embody superior qualities such as high voltage resistance, long lifespan, low loss, and high reliability within an ultra-miniature body. It successfully unifies the seemingly contradictory concepts of "small size" and "high performance," providing power engineers with a powerful tool to meet increasingly demanding design challenges. Whether developing next-generation gallium nitride fast charging or building highly reliable industrial power supplies, choosing the KCX series means choosing an efficient, stable, and durable power core for your products. It's not just a component number on a circuit diagram; it's a reliable cornerstone for your products to gain market trust.