1. Q: Yongming Capacitors claims its vibration resistance has improved from 5-10g to 10-30g. What specific test conditions does this “g” refer to? Is it random vibration or sinusoidal vibration? What are the test standards?
A: Here, “g” refers to gravitational acceleration, the unit of acceleration in vibration testing. The 10-30g vibration resistance parameter is typically based on sinusoidal vibration testing, which simulates the periodic vibration stress experienced by the product during transportation and use. The product’s testing standards reference industry-standard specifications such as IEC 60068-2-6 (International Electrotechnical Commission standard) to ensure its mechanical robustness in high-vibration environments.
2. Q: Besides vibration resistance, what specific advantages does this liquid capacitor have compared to ordinary liquid chip capacitors and solid-state capacitors of the same specifications in terms of ESR (Equivalent Series Resistance) and ripple current capability?
A: Compared to ordinary liquid capacitors, this product, through optimized electrode foil and electrolyte formulation, exhibits lower ESR and higher rated ripple current over a wide temperature range of -40°C to +105°C/125°C. This is crucial for handling large current pulses in electronic control systems. Compared to solid-state capacitors, it offers better cost-effectiveness at high temperatures and high voltage ratings, and avoids the DC bias characteristics of solid-state capacitors, resulting in more stable capacitance with voltage changes.
3. Q: What is the operating temperature range of this product? Especially in the high-altitude, low-temperature environments that low-altitude aircraft may experience, how is the capacitor’s low-temperature performance (e.g., ESR changes at -40°C)?
A: The standard product’s operating temperature range is -40°C to +105°C, with some models reaching +125°C. For high-altitude, low-temperature environments, we have specifically optimized the electrolyte formulation to ensure that the ESR increase remains within a controllable range at extremely low temperatures of -40°C, guaranteeing system stability during cold starts and low-temperature operation.
4. Q: What exactly is the structure of a “mount-mount” capacitor? How does it contribute to improved vibration resistance? Is it achieved through special potting compound, base mechanical structure, or lead frame design?
A: A “mount-mount” capacitor refers to a capacitor core package being securely mounted on a metal or resin base, and then surface-mounted (SMT) via pads on the base. Improved vibration resistance mainly relies on: 1) a robust base structure that distributes vibration stress from the PCB to the entire base; 2) rigid fixation of the internal core package to prevent internal electrode movement; and 3) high-performance potting compound to further buffer and absorb vibration energy. This three-pronged design collectively achieves a significant leap in vibration resistance.
5. Q: What challenges do capacitors face in water pump/oil pump drivers in automotive thermal management systems (such as high temperature and large ripple current)? How does Yung-Ming address these challenges?
A: Capacitors in water pump/oil pump drivers are typically used for filtering and buffering the inverter output, facing large ripple currents generated by high-frequency switching, high engine compartment temperatures, and engine vibration itself. Our products, with their high ripple current capability, high temperature rating of 105°C/125°C, and shock resistance of 10-30g, can operate stably in such harsh environments, ensuring the accuracy and reliability of motor control.
6: Q: In safety-critical systems such as Electric Power Steering (EPS), what are the failure modes of capacitors? How does Yongming maximize the avoidance of fatal failures such as short circuits and open circuits?
A: In EPS, capacitor failure (especially short circuits) can lead to system paralysis. We improve reliability through the following methods: 1) Using high-purity raw materials and strict process control to reduce internal impurities; 2) Explosion-proof valve design (although it is a surface-mount type, it has a pressure relief mechanism in its structure); 3) 100% surge current and withstand voltage testing to eliminate early failures. Furthermore, its excellent shock resistance directly prevents internal fractures (open circuits) or short circuits caused by vibration.
7: Q: In the flight control system of low-altitude aircraft, what is the main function of capacitors? Are they used for power filtering, energy storage, or signal coupling?
A: Primarily used in the power supply circuits of flight control computers and servo motor drivers, it functions as a voltage regulator, filter, and provider of instantaneous pulse current. Flight control systems have extremely high requirements for voltage purity and instantaneous response; the stable performance of the capacitor is fundamental to ensuring accurate sensor data and rapid servo response.
8: Q: The vibration spectrum caused by airflow changes experienced by aircraft is complex. Has this product been optimized for vibrations in a specific frequency range (e.g., 50Hz-2000Hz)?
A: Yes, our vibration testing covers a typical wide frequency range (e.g., 10Hz to 2000Hz), with particular attention to the mid-to-high frequency bands associated with common aircraft vibration sources (e.g., motors, propellers). Through structural design, its resonant frequency avoids these critical frequency bands, thus maintaining performance under complex vibration environments.
9: Q: Low-altitude aircraft are extremely sensitive to weight. How does this capacitor achieve high vibration resistance while controlling its weight and size? Is there a lightweight design?
A: We balanced vibration resistance with miniaturization during the design process. By using high-capacitance electrode foil to reduce the core package volume for the same capacity, and by optimizing the amount of base and encapsulation materials, while meeting the 10-30g shock resistance rating, its volume and weight remain at the same level as conventional products of the same specifications, meeting the lightweight requirements of aircraft.
10Q: Compared with solid capacitors, liquid capacitors usually have a limited lifespan (electrolyte drying out). How does Yung-Ming alleviate this problem?
A: We extend the lifespan through two key technologies: 1) using a composite electrolyte with high flash voltage and low vapor pressure to reduce evaporation loss at high temperatures; 2) using a high-performance sealing rubber stopper to greatly reduce electrolyte permeability. This significantly extends the lifespan of our liquid capacitors at high temperatures.
Post time: Nov-04-2025