Understanding APFC and Bronze Ratings in Computer Power Supplies

When it comes to selecting a computer power supply, two key terms often come up: APFC (Active Power Factor Correction) and Bronze Ratings. These terms play crucial roles in improving the overall performance and energy efficiency of your computer system. This article explores what these terms mean, their benefits, and how they contribute to a more reliable and energy-efficient setup.

What is APFC (Active Power Factor Correction)?

Active Power Factor Correction (APFC) is a technology commonly used in power supplies to enhance the power factor. The power factor is a measure of how effectively electrical power is converted into useful work output. A power factor of 1 or 100 indicates that all the electrical power is being used efficiently.

Definition of APFC

Active Power Factor Correction (APFC) is a technology that helps in improving the power factor of a power supply. This is achieved by reducing the harmonic distortion and reactive power, which improves the efficiency and stability of the electrical system.

Benefits of APFC

Reduces Reactive Power: By minimizing reactive power in the system, APFC leads to energy savings and reduced power loss. Compliance and Regulated Standards: APFC helps the power supply comply with international regulations and standards, reducing the load on the electrical infrastructure. Stability: It ensures a more stable output voltage and current, leading to better overall performance.

Understanding Bronze Ratings in Power Supplies

A 80 PLUS certification measures the efficiency of power supplies. These certifications range from 80 PLUS Bronze to the highest efficiency levels like Platinum and Titanium. One of the more common certifications, 80 PLUS Bronze, indicates a specific level of efficiency in the power supply.

Definition of Bronze Rating

The 80 PLUS Bronze rating signifies a power supply that has achieved a specific efficiency level. This is measured at various load levels to ensure consistent performance.

Efficacy Standards for 80 PLUS Bronze

To achieve the 80 PLUS Bronze rating, a power supply must meet the following efficiency levels at the specified load levels:

At 20% Load: 82% efficiency At 50% Load: 85% efficiency At 100% Load: 82% efficiency

Benefits of Bronze Rating

Heat Reduction: Efficient power supplies generate less heat and waste less energy, leading to a cooler operation and better performance. Cost Savings: The lower energy consumption results in lower electricity bills, leading to significant cost savings over time. Environmental Impact: Operating at higher efficiency levels results in a smaller carbon footprint, contributing to a more sustainable environment.

Summary

In summary, APFC improves the power factor and overall efficiency of a power supply, leading to better performance and compliance with international standards. The Bronze rating is a specific level of efficiency that ensures the power supply operates effectively at different load levels. Choosing a power supply with both APFC and a Bronze rating can significantly enhance the reliability and energy efficiency of your computer system.

While APFC is now a ubiquitous standard for modern power supplies, particularly for those above a few tens of watts, passive PFC is no longer used due to its requirement for large inductors and high costs. Instead, active PFC is the preferred and mandatory solution for most power supplies.