OCP ORv3 High Power Rack HPR Ecosystem Solution

Summary

The discussion centers on the design and testing of busbar systems in data centers, focusing on key factors such as parasitic inductance, temperature thresholds, and their impact on power supply units. Key temperature thresholds are established at 90°C, 110°C, and 120°C for monitoring and safety, emphasizing the importance of managing heat to prevent system shutdowns. The team also explores the relationship between busbar weight and current capacity, indicating a growing interest in high-power solutions. Collaboration opportunities for developing advanced busbars are highlighted, reflecting industry trends toward efficient power management.

Takeaways

• 😀 Higher parasitic inductance in cabling can lead to voltage overshoot during testing.
• 🔥 The PSU has defined temperature thresholds at 90°C, 110°C, and 120°C for managing overheating.
• 🔔 At 90°C, the PSU will adjust fan speed to cool down, while at 110°C, it will trigger an alarm without shutting down.
• ⛔ At 120°C, the PSU will shut down to prevent damage, ensuring the safety of the entire power shelf.
• 🌡️ The target bus bar temperature rise is set at 30°C, although testing limitations may affect accuracy.
• 📊 Simulations are utilized to correlate bus bar temperatures with connector temperatures for better monitoring.
• 🏋️ The bus bar's weight of 80 kg is based on a testing capacity of 155 kW, supporting around 3000 A.
• ⚡ Different current ratings necessitate different conductor thicknesses, impacting bus bar design and weight.
• 🤝 There is increasing industry interest in high-power rack bus bars, signaling a need for collaboration in development.
• 📅 Future publications will detail bus bar design for potential stakeholders interested in high-power applications.

Q & A

What is the impact of high parasitic inductance on bus bar voltage?

High parasitic inductance can cause higher voltage overshoot in bus bars, particularly if the cabling is not designed properly.

What temperature thresholds are set for monitoring bus bar temperature?

Three temperature thresholds are defined: 90°C for fan speed adjustment, 110°C for system alarming without shutdown, and 120°C for a direct PSU shutdown.

Why is it important not to shut down the PSU at 110°C?

Shutting down the PSU at 110°C would lead to the shutdown of the entire power shelf, which is undesirable for data center operations.

What method is used to determine bus bar temperature during testing?

During testing, the assumption is made that bus bar temperature is equivalent to connector temperature, although thermocouple placement is limited.

What is the target bus bar temperature rise mentioned in the discussion?

The target bus bar temperature rise is set at 30°C.

How much does the bus bar mentioned weigh, and what power level is it based on?

The bus bar weighs 80 kilograms and is based on a testing scenario involving 155 kW or 3,000 A.

What are the concerns regarding conductor thickness and weight?

Different conductor thicknesses will affect the weight and performance of the bus bar, leading to different specifications based on current levels.

Who expressed interest in participating in the development of high-power rack bus bars?

A representative from Interplex expressed interest in collaborating on the early development of high-power rack bus bars.

What is the purpose of the PSU adjusting fan speed at the first temperature threshold?

The PSU adjusts its fan speed at 90°C to attempt to cool down the system and prevent further temperature increases.

What approach is suggested to correlate bus bar and connector temperatures?

It is suggested to conduct additional tests with thermocouples on the connector contacts to better understand the relationship between bus bar and connector temperatures.