FAQs about YMIN's solid-liquid hybrid capacitors to address high power consumption in OBC/DCDC systems

Question 1

How do YMIN's solid-liquid hybrid capacitors address excessive power consumption caused by increased leakage current after reflow soldering?

Accepted Answer

By optimizing the oxide film structure through a polymer hybrid dielectric, we reduce thermal stress damage during reflow soldering (260°C), keeping leakage current to ≤20μA (the measured average is only 3.88μA). This prevents reactive power loss caused by increased leakage current.

Question 2

How do YMIN's ultra-low ESR solid-liquid hybrid capacitors reduce power consumption in OBC/DCDC systems?

Accepted Answer

YMIN's low ESR significantly reduces Joule heat loss caused by ripple current in the capacitor (power loss formula: Ploss = Iripple² × ESR), improving overall system conversion efficiency, especially in high-frequency DCDC switching scenarios.

Question 3

Why does leakage current tend to increase in traditional electrolytic capacitors after reflow soldering?

Accepted Answer

The liquid electrolyte in traditional electrolytic capacitors easily vaporizes under high-temperature shock, leading to oxide film defects. Solid-liquid hybrid capacitors use solid polymer materials, which are more heat-resistant.

Question 4

The maximum leakage current of 5.11μA after reflow soldering still meets automotive regulations?

Accepted Answer

Yes. The upper limit for leakage current is ≤94.5μA. The measured maximum value of 5.11μA for YMIN's solid-liquid hybrid capacitors is far below this limit, and all 100 samples have passed dual-channel aging tests.

Question 5

How do YMIN's solid-liquid hybrid capacitors guarantee long-term reliability with a lifespan of over 4000 hours at 135°C?

Accepted Answer

YMIN capacitors utilize polymer materials with high-temperature resistance, comprehensive CCD testing, and accelerated aging testing (135°C is equivalent to approximately 30,000 hours at 105°C) to ensure stable operation in high-temperature environments.

Question 6

What is the ESR variation range of YMIN solid-liquid hybrid capacitors after reflow soldering?

Accepted Answer

The measured ESR variation of YMIN capacitors is ≤0.002Ω (e.g., 0.0078Ω → 0.009Ω). This is because the solid-liquid hybrid structure suppresses high-temperature decomposition of the electrolyte.

Question 7

How should capacitors be selected to minimize power consumption in the OBC input filter circuit?

Accepted Answer

YMIN low-ESR models (e.g., VHU_35V_270μF, ESR ≤8mΩ) are preferred to reduce input-stage ripple losses. At the same time, leakage current should be ≤20μA to avoid increased standby power consumption.

Question 8

What are the advantages of YMIN capacitors with high capacitance density in the DCDC output voltage regulation stage?

Accepted Answer

High capacitance reduces output ripple voltage and lowers the need for subsequent filtering. The compact design (10×10.5mm) shortens PCB traces and reduces additional losses caused by parasitic inductance.

Question 9

Will YMIN capacitor parameters drift under automotive-grade vibration conditions?

Accepted Answer

Testing shows that ESR and leakage current change rates after vibration are less than 1%, preventing performance degradation due to mechanical stress.

Question 10

What are the layout requirements for YMIN capacitors during a 260°C reflow soldering process?

Accepted Answer

Capacitors should be ≥5mm away from heat-generating components to avoid localized overheating. A thermally balanced solder pad design is used to reduce thermal gradient stress.

Question 11

Are YMIN solid-liquid hybrid capacitors more expensive than traditional electrolytic capacitors?

Accepted Answer

YMIN capacitors offer a long lifespan (135°C/4000h) and low power consumption, reducing overall device lifecycle costs by over 10%.

Question 12

Can YMIN provide customized parameters (such as lower ESR)?

Accepted Answer

Yes. We can adjust the electrode structure based on the customer's switching frequency to further reduce ESR to 5mΩ, meeting ultra-high-efficiency OBC requirements.

Question 13

Do YMIN's solid-liquid hybrid capacitors support 800V high-voltage platforms?

Accepted Answer

Yes. The VHT series has a maximum withstand voltage of 450V (e.g., VHT_450V_100μF) and a leakage current of ≤35μA. It has been used in DC-DC modules for many 800V vehicles.

Question 14

How do YMIN's solid-liquid hybrid capacitors optimize power factor in PFC circuits?

Accepted Answer

Low ESR reduces high-frequency ripple losses, while a low DF value (≤1.5%) suppresses dielectric losses, boosting PFC-stage efficiency to ≥98.5%.

Question 15

Does YMIN provide reference designs?

Accepted Answer

The OBC/DCDC power topology reference design library (including simulation models and PCB layout guidelines) is available on our official website. Register an engineer account to download it.

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