(MENAFN- Market Press Release) October 28, 2025 12:00 am - High-Power DC Charging Piles: FAQs on Key Applications and Requirements for YMIN Capacitors

Currently, new energy vehicle charging infrastructure is rapidly upgrading towards high power and high efficiency, with high-power DC charging piles becoming a core area of??industry development. As a key component of the charging pile power module, capacitors' performance, adaptability, and operational stability directly impact the overall effectiveness of the equipment. In response to key industry concerns regarding the application of Yongming capacitors in high-power DC charging piles, we have analyzed ten key FAQs below to provide technical reference for industry development.

1Q: What are the key functions of Yongming capacitors in high-power DC charging piles?

A: Yongming capacitors perform two core functions in high-power DC charging piles: DC link and AC filtering. Together, they provide the foundation for stable operation. The DC link capacitors stabilize the DC bus voltage and efficiently absorb the high-frequency ripple current generated during equipment operation, ensuring stable voltage output. The AC filter capacitors filter electromagnetic interference transmitted from the grid, ensuring stable operation of the charging pile system while meeting mandatory electromagnetic compatibility (EMC) standards.

2Q: When PCB layout space is limited, are there any smaller DC-link capacitors available?

A: Yongming has developed a mature solution to the common technical challenge of limited PCB layout space in the industry, launching the MDP(X) series of miniaturized DC-link capacitors. While maintaining the same lifespan and voltage specifications, this series boasts increased capacity compared to conventional products. Its significant technical advantage of "small size, large capacity" allows for direct adaptation to a wide range of space-constrained applications, effectively addressing layout challenges.

3Q: Does Yongming offer customized capacitor products specifically for new energy vehicle charging piles?

A: Yongming has developed the MDR series of customized busbar capacitors specifically for the new energy vehicle sector (including core charging pile applications). This series offers comprehensive parameter coverage, with a voltage range of 450-2000Vdc and a wide capacitance range of 50?F-3000?F. We provide precise customization services based on the technical requirements of charging piles of varying power levels, adapting to the full spectrum of charging pile products, from low- to medium-power to ultra-high-power.

4Q: How important is ripple current capability for DC-LINK capacitors? How do Yongming capacitors perform?

A: Ripple current capability is a core performance indicator for DC-LINK capacitors, directly determining the power handling limit and operational reliability of a charging pile. In high-power charging scenarios, the rapid switching of IGBTs or SiC modules generates large ripple currents. If the capacitor's ripple current capability is insufficient, it can easily lead to device overheating and damage, or reduce system efficiency. Yongming film capacitors, leveraging their core technological advantage of low equivalent series resistance (ESR), offer excellent ripple current capability, providing key support for improved efficiency and long-term reliable operation of charging pile systems.

5Q: How does capacitor lifespan affect the overall maintenance cost of a charging pile?

A: As a key energy storage component in a charging pile, the lifespan of the capacitor directly determines the maintenance cycle of the core power module, which in turn has a decisive impact on overall maintenance costs. Choosing Yongming's long-life capacitors can significantly reduce the frequency of downtime and replacement due to component failures. This not only reduces the direct costs of labor and component replacement, but also avoids indirect revenue losses caused by operational interruptions. These capacitors are particularly suitable for applications requiring extremely high reliability, such as public charging stations.

6Q: How do Yongming capacitors ensure reliability in harsh environments (such as high temperature and high humidity)?

A: Film capacitors inherently offer superior moisture resistance compared to electrolytic capacitors. Yongming enhances this performance through three key technologies. First, they use high-quality metallized film as the core material, enhancing the product's weather resistance from the source. Second, they implement rigorous sealing processes, such as epoxy resin or plastic encapsulation, to effectively isolate external interference such as moisture and dust. Third, before shipping, the products undergo comprehensive environmental reliability testing, including temperature cycling and humidity testing, to ensure stable performance under extreme operating conditions like high temperature and high humidity.

7Q: Do Yongming capacitors support high-frequency switching applications (such as SiC MOSFET solutions)?

A: Yongming capacitors are fully adaptable to high-frequency switching applications, especially SiC MOSFET solutions, demonstrating their inherent technical compatibility. Film capacitors inherently offer extremely low equivalent series inductance (ESL) and excellent frequency characteristics, making them ideal for the higher switching frequencies demanded by SiC MOSFETs. They also effectively suppress high-frequency oscillations and overvoltage spikes, ensuring safe and stable operation of power modules.

8Q: In cost-sensitive projects, how do you balance Yongming film capacitors with aluminum electrolytic capacitors?

A: From a performance perspective, Yongming film capacitors outperform aluminum electrolytic capacitors in terms of service life, operational reliability, and key indicators such as equivalent series resistance (ESR) and equivalent series inductance (ESL). However, the cost per device is relatively high. Industry-specific choices can be made based on project requirements: For high-end commercial charging stations requiring low maintenance, high power density, and a long service life, film capacitors are the optimal technical solution. For cost-sensitive applications with relatively relaxed lifespan requirements, aluminum electrolytic capacitors can be considered, but a regular replacement maintenance plan should be planned in advance.

9Q: What are the main modes of capacitor failure? What preventative measures does Yongming have in place for capacitors?

A: The main failure modes of capacitors include short circuits (fatal failures) and capacity degradation and open circuits (performance failures). To address these risks, Yongming metallized film capacitors utilize a core film material with self-healing properties. When a local breakdown occurs in the device, the metal layer surrounding the breakdown point instantly evaporates, rapidly restoring insulation properties. This effectively prevents catastrophic failures such as short circuits and significantly improves product safety.

10Q: What new requirements will the future increase in charging pile power place on capacitor technology?

A: With the continuous increase in charging pile power density, the industry is placing core development requirements on capacitor technology: "higher voltage, larger capacity, and smaller size," while also maintaining the fundamental performance of high reliability and long service life. Yongming has already established a forward-looking technology strategy through its MDP(X) series of miniaturized products and MDR series of customized products, fully adapting to future technological trends in high-power charging piles.

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