Capacitor

Posted on by lechuck park

The provided image is a detailed comparison chart contrasting two primary supercapacitor technologies: Electric Double-layer Capacitors (EDLC) and Lithium-Ion Capacitors (LIC), evaluating them across several key technical performance metrics. This chart is designed to help users intuitively understand the strengths and weaknesses of each technology.

At the top of the image is the title “Capacitor”, below which are two main columns:

  • Left Column (Brown Header): Details the characteristics of EDLC, the most common form of supercapacitor.
  • Right Column (Yellow Header): Highlights the properties of LIC, a hybrid type that combines capacitor and battery technologies.

The rows on the left list seven technical performance metrics for comparison. For each metric, specific data points and descriptions are provided for both types.

Detailed Comparison breakdown:

  1. Energy Density: Indicates the amount of energy that can be stored per unit of weight. EDLC has a “Very Low” energy density of 2 ~ 6 Wh/kg, whereas LIC offers 10 ~ 20 Wh/kg, which is 3-4 times higher than EDLC. This means LIC can store more total energy.
  2. Power Density: Represents how quickly energy can be released per unit of weight. Here, EDLC boasts an “Ultra-high” performance exceeding 10 kW/kg. LIC is also high at 3 ~ 6 kW/kg, though lower than EDLC.
  3. Operating Voltage: The range of operating voltage per cell. EDLC is 2.7V ~ 3.0V, while LIC provides a higher voltage at 3.8V. This is advantageous as it allows for fewer cells connected in series to achieve high voltage systems.
  4. Charge/Discharge Time: The time it takes to charge or release energy. EDLC is exceptionally fast, in the range of milliseconds to seconds. LIC is in the seconds to minutes range, slower than EDLC but much faster than batteries.
  5. Cycle Life: The number of charge-discharge cycles possible before performance degradation. EDLC has a “Semi-permanent” cycle life of over 1,000,000 cycles, whereas LIC is approximately 500,000 cycles, shorter than EDLC.
  6. Discharge Limit: The safe voltage limit for discharge. EDLC can be fully discharged to 0V, whereas LIC risks damage if discharged below 2.2V.
  7. Self-Discharge Rate: The rate at which the device loses charge when not in use. EDLC is rated “High”, meaning it loses charge quickly. LIC is rated “Low”, as it retains voltage well thanks to lithium doping.

Summary

This chart clearly contrasts the two main streams of supercapacitor technology.

  • EDLC excels with its ultra-fast charge/discharge capabilities, near-infinite cycle life, and full discharge to 0V, making it ideal for applications requiring instantaneous high power or frequent rapid-cycling (e.g., power buffering, rapid charging systems).
  • LIC is a hybrid technology that significantly boosts energy density while maintaining much of the high power density of an EDLC. Offering higher operating voltage and lower self-discharge rates, it is a better choice for energy storage applications that need the fast responsiveness of a supercapacitor but require longer energy retention periods (e.g., portable electronics, back-up power for energy storage systems).

#Supercapacitor #Supercondenser #EDLC #LIC #ElectricDoubleLayerCapacitor #LithiumIonCapacitor #EnergyDensity #PowerDensity #CycleLife #TechnologyComparison #ElectronicComponents #EnergyStorageSystem #HighPower

Is the data accurate?

Posted on by lechuck park

Looking at how my career started…
From a young age, computer programming has been something I have enjoyed with great interest.
What we do is use logic that works precisely based on data.
Making it… Especially at the system kernel level, details like how to operate for optimization… So I wasn’t very interested in data coming in from outside, nor was I used to doubting the data itself.

But… Data center? Upon entering the world… A little later, about DCIM… What is the newest thing you learned while getting to know it… How difficult it is to make the data itself accurate and stable at the desired level. “Preparing accurate data (numbers).”

Moreover. Now, at AI DC… From the perspective of expanding automation to respond to larger, high-density, and high-volatility…
“Is that data (number) accurate?”
“Is the explanation of that data (number) accurate?”
is the most important thing above all. This is the beginning of everything.

There’s something I often say.

In the past, in “1+1=0,” we used to do +,= (calculation)… I never knew it would be so difficult for this guy to get even one ‘1’ so accurate.”

As expected, the more you know, the harder the world becomes.
Sometimes I just want to do programming I liked—or maybe maybe I want to create something on my own…. That’s just a temporary thought… What I liked was about making things, and I know very well that we have to work together for that. Now, 🙂

80:20

Posted on by lechuck park

The central theme of the image is captured by the prominent text in the sky: “The Foundation Never Betrays You.” Just below it, a supporting phrase states, “True speed and innovation are possible only on a solid foundation.”

The Bottom Section: The Solid Foundation (80%)
The lower portion of the structure resembles an ancient, massive stone base. This represents the essential framework (Data, Protocol, Infrastructure) that accounts for 80% of the entire system. This foundation consists of four key pillars:

  • Data Collection: Sensors, Logs, Metrics, Events.
  • Standard Protocol: SNMP, Redfish, gRPC/API, Open Standards.
  • Infrastructure Stability: Compute, Network, Power, Cooling.
  • Data Quality & Governance: Accuracy, Consistency, Security, CMDB.

The Top Section: Innovation & High Speed (20%)
Atop the stone foundation sits a transparent, modern data center building. This represents the innovation layer, making up the remaining 20%, which symbolizes AI Agent, Orchestration, Automation, and Performance.

  • The sky on the right lists the resulting benefits: Faster Response, Higher Efficiency, Greater Innovation, and Self-Operating.

Surrounding Background & Details

  • Bottom Left: A boy with a backpack and a cat sit on a grassy hill, looking up at the massive structure. A nearby signpost reads, “Small details build big results.”
  • Right Background: Along with the phrase “From a Stable Foundation to Infinite Possibilities,” a spacecraft (or jet) is depicted flying rapidly over a futuristic city, hinting at technological advancement and the future.

📝 Summary

This conceptual illustration visually emphasizes that in order for cutting-edge technologies (such as AI and automation) to operate successfully and achieve true innovation, they must be supported by a rock-solid, unseen foundation (80%) comprising underlying infrastructure, data collection, and standard protocols.

#AIInfrastructure #ITInfrastructure #DataCenter #CloudComputing #SolidFoundation #InnovationAndStability #DataGovernance #ITArchitecture

With Gemini