Q: 1. Which automotive thermal management system components are suitable for the VHE series?
A: The VHE series is designed for high-power density applications in thermal management systems, including electronic water pumps, electronic oil pumps, and cooling fans. It provides high performance, ensuring stable operation of these components in harsh temperature environments, such as engine compartment temperatures up to 150°C.
Q: 2. What is the ESR of the VHE series? What is the specific value?
A: The VHE series maintains an ESR of 9-11 mΩ over the full temperature range of -55°C to +135°C, which is lower and has less fluctuation than the previous generation VHU series. This reduces high-temperature losses and energy loss, improving system efficiency. This advantage also helps reduce the interference of voltage fluctuations on sensitive components.
Q: 3. What is the ripple current handling capability of the VHE series? By what percentage?
A: The VHE series’ ripple current handling capability is over 1.8 times higher than that of the VHU series, effectively absorbing and filtering the high ripple current generated by motor drives. The documentation explains that this significantly reduces energy loss and heat generation, protects actuators, and suppresses voltage fluctuations.
Q:4. How does the VHE series withstand high temperatures? What is its maximum operating temperature?
A: The VHE series is rated for an operating temperature of 135°C and supports harsh ambient temperatures up to 150°C. It can withstand harsh underhood temperatures, offering reliability far exceeding conventional products and a service life of up to 4,000 hours.
Q:5. How does the VHE series demonstrate its high reliability?
A: Compared to the VHU series, the VHE series has enhanced overload and shock resistance, ensuring stable operation under sudden overload or shock conditions. Its excellent charge and discharge resistance accommodates frequent start-stop and on-off cycles, extending its service life.
Q:6. What are the differences between the VHE series and the VHU series? How do their parameters compare?
A: The VHE series is an upgraded version of the VHU, featuring lower ESR (9-11mΩ vs. VHU), 1.8 times higher ripple current capability, and higher temperature resistance (supporting 150°C ambient).
Q:7. How does the VHE series address automotive thermal management system challenges?
A: The VHE series addresses the high power density and high temperature challenges brought about by electrification and intelligent driving. It offers low ESR and high ripple current handling capabilities, improving system response efficiency. The document summarizes that it optimizes thermal management design, reduces costs, and provides reliable support for OEMs.
Q:8. What are the cost-effectiveness advantages of the VHE series?
A: The VHE series reduces energy loss and heat generation through its ultra-low ESR and ripple current handling capabilities. The document explains that this optimizes thermal management design and reduces system maintenance costs, thereby providing cost support for OEMs.
Q:9. How effective is the VHE series in reducing failure rates in automotive applications?
A: The VHE series’ high reliability (overload and shock resistance) and long life (4000 hours) reduce system failure rates. It ensures stable operation of components such as electronic water pumps under dynamic conditions.
Q:10. Is the Yongming VHE series automotive-certified? What are the testing standards?
A: VHE capacitors are automotive-grade capacitors tested at 135°C for 4000 hours, meeting stringent environmental requirements. For certification details, engineers can contact Yongming to obtain the test report.
Q:11. Can VHE capacitors address voltage fluctuations in thermal management systems?
A: Ymin VHE capacitors’ ultra-low ESR (9mΩ level) suppresses sudden current surges and reduces interference with surrounding sensitive devices.
Q:12. Can VHE capacitors replace solid-state capacitors?
A: Yes. Their hybrid structure combines the high capacitance of the electrolyte with the low ESR of polymers, resulting in a longer lifespan than conventional solid-state capacitors (135°C/4000 hours).
Q:13. To what extent do VHE capacitors rely on heat dissipation design?
A: Reduced heat generation (ESR optimization + reduced ripple current loss) simplifies heat dissipation solutions.
Q:14. What are the risks associated with installing VHE capacitors near the edge of the engine compartment?
A: They can withstand temperatures up to 150°C and can be installed directly in high-temperature areas (such as near turbochargers).
Q: 15. What is the stability of VHE capacitors in high-frequency switching scenarios?
A: Their charge and discharge characteristics support thousands of switching cycles per second (such as those used in PWM-driven fans).
Q:16.What are the comparative advantages of VHE capacitors compared with competitors (such as Panasonic and Chemi-con)?
Superior ESR Stability:
Full temperature range (-55°C to 135°C): ≤1.8mΩ fluctuation (competitive products fluctuate >4mΩ).
“ESR value remains between 9 and 11mΩ, superior to VHU with less fluctuation.”
Engineering Value: Reduces thermal management system losses by 15%.
Breakthrough in Ripple Current Capacity:
Measured Comparison: VHE’s current carrying capacity exceeds competitors by 30% for the same size, supporting higher-power motors (e.g., electronic water pump power can be increased to 300W).
Breakthrough in Life and Temperature:
135°C test standard vs. competitor’s 125°C → Equivalent to the same 125°C environment:
VHE rated life: 4000 hours
Competitive life: 3000 hours → 1.3 times that of competitors
Mechanical Structure Optimization:
Typical competitor failures: Solder fatigue (failure rate >200W in vibration scenarios) FIT)
VHE: “Enhanced overload and shock resistance, adapting to frequent start-stop conditions.”
Measured improvement: Vibration failure threshold increased by 50% (50G → 75G).
Q:17. What is the specific ESR fluctuation range of VHE capacitors over the entire temperature range?
A: Maintains 9-11mΩ from -55°C to 135°C, with fluctuations ≤22% at a 60°C temperature difference, which is better than the 35%+ fluctuation of VHU capacitors.
Q:18. Does the starting performance of VHE capacitors degrade at low temperatures (-55°C)?
A: The hybrid structure ensures a capacity retention rate of >85% at -55°C (electrolyte + polymer synergy), and ESR remains ≤11mΩ.
Q:19. What is the voltage surge tolerance of VHE capacitors?
A: VHE capacitors with enhanced overload tolerance: They support 1.3 times the rated voltage for 100ms (e.g., a 35V model can withstand 45.5V transients).
Q: 20. Are VHE capacitors environmentally compliant (RoHS/REACH)?
A: YMIN VHE capacitors meet RoHS 2.0 and REACH SVHC 223 requirements (basic automotive regulations).
Post time: Aug-28-2025