**Main Question:** "My OBC board doesn't have enough space, and traditional horn capacitors take up too much room. Are there any small-sized through-hole electrolytic capacitors that don't reduce capacitance?"

**Question Type:** Selection/Miniaturization

**Q:** Our 11kW OBC aims for a power density of 4kW/L, and capacitor size is a bottleneck. Are there any small-sized 700V high-voltage capacitors?

**A:** You can evaluate the ymin LKD 700V 150μF (25mm diameter, 50mm height). It's about 30% smaller than standard horn capacitors for the same voltage and capacitance, helping to achieve the high power density target.

**Question Type:** Mechanical Design/Reliability

**Q:** For a compact design, I want to install capacitors horizontally. Are there any small capacitors with low risk of the explosion-proof valve opening?

A: ymin's LKD series features a small-diameter design with a leak-proof sealing structure, ensuring high reliability even in complex mounting configurations and adapting to compact layouts.

Question Type: Selection/Alternative

Q: My PFC circuit requires high capacitance, but traditional 450V capacitors are too bulky. Are there more compact alternatives?

A: We recommend ymin's LKD 450V/500V 330μF capacitors. They achieve high capacitance in a 25mm diameter, reducing size by 20%-40% compared to traditional solutions, making them suitable for compact PFC designs.

Question Type: Selection/Structure

Q: With a double-sided surface mount PCB design, the vertical space for through-hole capacitors is very limited. Are there any shorter capacitors you would recommend?

A: ymin's LKD series offers multiple height options, such as 500V 220μF (46mm) and 450V 330μF (45mm), suitable for applications with limited vertical mounting space.

Problem Type: Solution

Q: The module casing is already designed, and the internal space cannot be changed. How can we increase the capacity without altering the design?

A: Use ymin LKD high-capacity density capacitors. These can directly replace existing products, maintaining or increasing capacity without changing the spatial structure, and also optimizing heat dissipation.

Subsidiary Question: "Automotive-grade projects require a lifespan of at least 8000 hours at 105℃. Ordinary commercial capacitors cannot meet this requirement. Do you have long-life automotive-grade capacitors that meet this standard?"

Problem Type: Reliability/Verification

Q: We need long-life capacitors that meet automotive-grade standards. How did you arrive at the 105℃/8000-hour lifespan data for your LKD series?

A: The 105℃/8000-hour lifespan data for the ymin LKD series comes from rigorous testing, meeting automotive-grade long-term reliability requirements.

Problem Type: Reliability/Design Support

Q: The actual case temperature of the capacitors often reaches above 90℃. How do you estimate the actual lifespan under these conditions?

A: Capacitor lifespan is strongly correlated with operating temperature. The LKD series has a baseline lifespan of 8000 hours at 105℃. When the actual case temperature is lower than this value, the lifespan increases significantly with decreasing temperature.

Question Type: Reliability/Market Suitability

Q: Our vehicles exported to the Middle East have extremely stringent high-temperature lifespan requirements for capacitors. Can you meet these requirements?

A: Yes, the Yongming LKD series boasts a long lifespan of 8000 hours at 105℃, specifically designed for harsh automotive environments such as high-temperature regions.

Question Type: Technical Principles

Q: Is capacitor lifespan related to ripple current? Under what conditions were your lifespan data tested?

A: Closely related. Internal heat generated by ripple current is a key influencing factor. The LKD series' 8000-hour lifespan is based on testing at 105℃. Detailed characteristics can be found in the official documentation.

Question Type: Quality/Supply Chain

Q: How do you ensure that the lifespan of each capacitor in a batch is consistent to avoid premature failure?

A: Yongming ensures consistent product performance and significantly reduces early failure rates in mass applications through rigorous process quality control and aging tests.

Main Question: "On an 800V high-voltage platform, how much voltage margin is needed for capacitors to ensure system reliability? How do you guarantee the long-term reliability of your capacitors under high voltage?"

Question Type: High Voltage Application/Selection

Q: Is a 450V rated voltage capacitor sufficient in an 800V system? Will it easily break down?

A: Not recommended. For 800V systems, we recommend Yongming's 700V series. Sufficient voltage margin can absorb surges and spikes, improving the safety margin.

Question Type: Reliability/Testing and Verification

Q: During lightning surge testing, spikes far exceeding the rated voltage may occur across the capacitor. Can your capacitors withstand this?

A: Yongming's LKD series employs a sufficient voltage margin design and rigorous aging tests, resulting in excellent high-voltage reliability and the ability to handle transient overvoltages.

Question Type: Design Support/Reliability

Q: What voltage derating ratio is generally recommended for safe and reliable capacitor use?

A: For automotive high-voltage applications, it is recommended that the operating voltage not exceed 80%-90% of the rated value. The LKD series provides ample margin for derating designs.


Question Type: Technical Principles/Reliability

Q: How can the long-term reliability of capacitors under high voltage be guaranteed through design, rather than just achieving the nominal high withstand voltage?

A: ymin ensures the long-term reliability of the LKD series high-voltage capacitors through a dual-stage approach: ample voltage margin design and rigorous aging tests.


Question Type: Performance/Reliability

Q: What are the DC bias characteristics of the capacitors? Will the capacitance decay be severe under high voltage?

A: The LKD series capacitors have stable capacitance at rated voltage. For specific DC bias characteristics, please refer to the official datasheet.


Question from the parent company: "My OBC module has a very high ripple current under full load, and I'm worried about the capacitor overheating. How good is the ripple current tolerance of your products? How much can it exceed the rated value?"

Question Type: Selection/Performance Verification

Q: My OBC output ripple current RMS is 8A. Can your 500V 330μF capacitor withstand this?

A: The LKD 500V 330μF capacitor has a rated ripple current of approximately 2.7A at 105℃/100kHz (based on the latest datasheet). For an 8A requirement, three capacitors can be connected in parallel, with a total capacity of approximately 8.1A. 1.3 times the overcurrent capability + excellent consistency ensures reliability.

Question Type: Technical Principles/Design Support

Q: How does the capacitor's ripple current tolerance change with frequency? Is there a significant difference between 50kHz and 100kHz?

A: The LKD series is optimized for high frequencies. Please refer to the official datasheet for the ripple current tolerance characteristics as a function of frequency.

Question Type: Reliability/Design Support

Q: How to evaluate the temperature rise of a capacitor under maximum ripple current? How much does temperature rise affect lifespan?

A: Temperature rise is caused by ripple current flowing through the ESR, directly affecting lifespan; the LKD series features low ESR and high ripple resistance to control temperature rise, ensuring a lifespan of 105℃/8000 hours.


Question Type: Design Support/Application

Q: Can two capacitors connected in parallel share the ripple current? What precautions should be taken when using them in parallel?

A: Yes, but capacitors with identical parameters should be selected and symmetrically arranged to share the current; the LKD series has excellent ripple resistance and is suitable for this scenario.
Question from the parent company: "Our project mandates AEC-Q200 certification. Have ymin's LKD series capacitors passed this certification? Can you provide the certificate?"

Question Type: Performance/Reliability

Q: Does your "stable performance at 1.3 times the rated value" refer to short-term overload or long-term withstand capability?

A: It refers to short-term overload capability, reflecting robustness under abnormal operating conditions; long-term operation is recommended within the rated ripple current.

Question Type: Regulatory Compliance

Q: What is the AEC-Q200 certification number for your LKD series capacitors? We need it for filing.

A: The LKD series has passed AEC-Q200 certification. You can consult sales/customer service for the certificate number for filing.

Question Type: Regulatory Compliance/Verification

Q: What items are included in the certification testing? Is temperature cycling testing conducted?

A: AEC-Q200 includes stringent tests for reliability, lifespan, and environmental adaptability. The LKD series has passed this certification.

Question Type: Quality/Supply Chain

Q: Our OEM requires all components to pass AEC-Q200. Can you guarantee batch consistency?

A: Yes. AEC-Q200 certification covers materials, design, production, and testing, with batch traceability, ensuring consistent quality between mass production and certified samples.

Question Type: Regulatory Compliance/Reputation

Q: Besides AEC-Q200, what other relevant industry certifications have your capacitors passed?

A: They comply with multiple international standards. For specific certifications of the LKD series, please refer to the official specifications or certification documents.

Question Type: Quality/Supply Chain

Q: Are there any requirements for the production plant for certification? Is your production line based on the IATF 16949 system?

A: AEC-Q200 is for product certification. Yongming's production plant already operates the IATF 16949 automotive quality management system.