Makale de buldum ama okumaya mecalim yok, chatgpt 'ye sordum. Şu cevabı verdi. En alttaki kaynaklardan ilkinde üretici Vishay' a link de var, üretici de arada şarj olması iyi diyor.
Do capacitors in PC power supply not in use degrade over time while power supply is not energized? Is it better to energize power supply time to time to prevent degradation of capacitors. I don't know which capacitor type is used in PC power supplies. So also consider type of capacitors used in PC power supplies when answering.
ChatGPT:
Yes, capacitors in a PC power supply can degrade over time, even if the power supply is not energized. The type of degradation depends on the type of capacitors used.
Capacitor Types in PC Power Supplies
- Electrolytic Capacitors (Aluminum Electrolytic)
- These are the most common in PC power supplies, used in filtering and energy storage.
- Degradation in storage: The electrolyte can dry out over time, and the dielectric layer (formed by an electrochemical process) can degrade if not periodically reformed.
- Solution: Periodically applying voltage (energizing the PSU) helps maintain the dielectric layer, preventing excessive leakage current when powered on after long periods.
- Polymer Capacitors
- Found in high-end or modern PSUs, these are more stable than electrolytic capacitors.
- Degradation in storage: Minimal compared to electrolytic capacitors; they do not suffer from electrolyte drying.
- Solution: No need for periodic energizing.
- Ceramic and Film Capacitors
- Used in filtering and EMI suppression.
- Degradation in storage: Almost none unless exposed to moisture or extreme conditions.
- Solution: No need for periodic energizing.
Should You Energize the PSU Periodically?
Yes, if your power supply contains electrolytic capacitors (which most do), it’s beneficial to energize it periodically.
- How often? Once every 3-6 months for 30-60 minutes should be enough to prevent excessive degradation.
- Why? This allows the dielectric layer in electrolytic capacitors to reform, reducing the risk of high leakage current or failure when the PSU is powered on after a long time.
If your PSU uses high-quality polymer capacitors, periodic energizing is less critical.
Show me resources claiming electrolytic capacitors degrading faster if they are not energized periodically.
ChatGPT:
Yes, electrolytic capacitors can degrade faster when left unenergized for extended periods. This degradation primarily stems from changes in the dielectric oxide layer and increased leakage current.
Key Points:
- Dielectric Oxide Layer Degradation: When electrolytic capacitors remain unpowered for prolonged durations, the dielectric oxide layer can deteriorate, leading to increased leakage current. Periodic application of voltage can help maintain this layer's integrity.
- Manufacturer Recommendations: Some manufacturers advise against storing capacitors without voltage for extended periods. For instance, Vishay suggests reforming electrolytic capacitors after long storage times. Electrical Engineering Stack Exchange
- Increased Leakage Current: Long-term storage without applied voltage can lead to higher leakage currents. This is due to the degradation of the insulating interface, which can be mitigated by periodic energization or a reforming process. aictech-inc.comEng-Tips
In summary, to prevent accelerated degradation of electrolytic capacitors during storage, it's advisable to periodically energize them. This practice helps maintain the dielectric layer and reduces the risk of increased leakage current when the capacitors are eventually put back into service.
Kaynaklar
Many manufacturers suggest reforming an electrolytic capacitor after it has been stored for a long period. For example, Vishay describes this process: (source) An increase in ESR could happen beca...
electronics.stackexchange.com
AICtech capacitors are designed and manufactured under strict quality control and safety standards. To ensure safer use of our capacitors, we ask our customers to observe usage precautions and to adopt appropriate design and protection measures (e.g., installation of protection circuits)...
www.aictech-inc.com
I have stored here electronic devices with aluminum electrolytic capacitors used and manufactured in the early 90s. Here the temperature varies between 33-36C RH: 57-67% without rain in my home. These electronic devices need to be energized what maximum interval time for energize all...
www.eng-tips.com