Introduction
With increasingly stringent mandatory 3C certification, power bank design is no longer just about “charging,” but about finding the optimal balance between safety, stability, and efficiency. This article takes the Xiaomi 3-in-1 power bank as an example, deeply analyzing the technical challenges in selecting its high-voltage filter electrolytic capacitors and the solutions provided by YMIN’s KCM series.
YMIN Solution and Advantages
Early solutions often resulted in overheating and system restarts during fast charging. User feedback focused on safety anxieties such as “not daring to leave while charging” and “fear of explosion.” Disassembly and analysis revealed significant shortcomings in the original capacitor design regarding ripple current tolerance, ESR control, and heat dissipation, making it unable to withstand the high-frequency, high-current surges of PD fast charging.
Root Cause Technical Analysis
From an electrical perspective, the root cause of the problem lies in: ① Low energy conversion efficiency: Ordinary capacitors experience increased ESR at high frequencies, leading to energy loss converted into heat; ② Insufficient ripple current capability: Large bus voltage fluctuations trigger false triggering of system protection mechanisms; ③ Lack of thermal management design: Inappropriate capacitor layout and obstructed heat dissipation paths result in accumulated temperature rise; ④ Key parameters such as ripple current withstand value, ESR@100kHz, and service life@105℃ do not meet high reliability requirements.
YMIN Solutions and Process Advantages
YMIN KCM series liquid aluminum electrolytic capacitors offer the ideal replacement solution due to the following technical characteristics:
High capacitance density: Achieves 27μF/400V in an 8×18mm size and 39μF/400V in a 10×19mm size, superior to competing products.
Ultra-low ESR: Effectively suppresses ripple noise and improves conversion efficiency; measured ESR value is below 30mΩ.
High ripple current tolerance: Supports ≥2A@105℃/100kHz, meeting the instantaneous impact requirements of fast charging circuits.
Long lifespan guarantee: 105℃/3000-hour durability test, capacity degradation <10%.
Application Scenarios and Recommended Models
This solution is suitable for all high-density, high-reliability consumer electronics power supply designs, especially PD fast charging, 3-in-1 power banks, and car chargers. Recommended models: KCM_400V_27μF_8*18/KCM_400V_39μF_10*19
Data Verification and Reliability Description
We compared key performance indicators with competitors in the same voltage range:
Conclusion
With the mission of “For capacitor applications, turn to YMIN,” YMIN is gradually replacing international brands and becoming a leader in China’s capacitor industry through technological innovation and practical testing. Choosing YMIN is not just choosing a component, but also choosing a reliable technology partner.
Post time: Dec-19-2025