High-end server redundant power supply achieves new Ruby certification

Delta has announced its 5,500W 19in (1RU) and ORv3 21in (1OU) high-power redundant power supplies for AI servers have recently become the world's first to achieve the industry's highest energy efficiency certification 80 PLUS Ruby due to the groundbreaking peak efficiency as high as 97.5%, and a power factor of 0.99 under full load. The company has drawn upon its superior prowess in soft-switching technology and advanced circuit topology while also applying third-generation power semiconductor technology to surpass the stringent conditions of the 80 PLUS Ruby certification and deliver a 59% increase in power density at 51W/inch³.

Mr Dong Kai, general manager of Delta Energy System's Custom Design Business Unit, expressed, "Stable and efficient power supplies are core components of AI servers, playing a crucial role in the operation of AI servers while helping to enhance performance and reduce energy consumption. Delta's 5,500W high-power redundant power supplies offer an energy efficiency of up to 97.5% and have already been adopted by major global AI companies. This milestone is a testament to Delta's global leadership in power management and to our long-term commitment to innovation, with a focus on fostering energy-efficient power solutions for the global AI industry."

80 PLUS is a well-known international power supply efficiency standard that is particularly higher than most others that many standard power supply units apply. It stipulates the necessity for power supplies to reach an energy efficiency of at least 80% across diverse operating stages. It is also recognised by the energy-saving standard ENERGY STAR of the US Environmental Protection Agency and the EU certification. Over the past 20 years, it has set six certification levels for internal power supply products, the highest being Titanium. In January 2025, the Ruby certification was launched. Regarding the peak power efficiency attained by redundant power supplies under a 50% load condition, the Titanium standard requires 96%, while the Ruby standard requires 96.5% and a power factor (PF) of at least 0.96. Consequently, Ruby has now replaced Titanium and became the highest tier.

With the rapid growth of AI, the demand for power supply systems in data centres is becoming increasingly high to handle large amounts of data and complex computations. The company's power solutions are responding to the market trends by ceaselessly advancing the boundaries of power products. This high-end 5,500W server redundant power supply is developed for AI data centres, offering dual 19in (1RU) and 21in (1OU) ORV3 standard rack configurations. It supports an input voltage range from 200V to 277V and delivers an output power of 5,500W, with an overall conversion efficiency of up to 97.5%. According to the 80 PLUS testing report, this product performs a power factor of 0.99 under full load, which is exceedingly close to the ideal value of 1, demonstrating that most of the electrical energy is efficiently transformed into the computational power required by the data centre while minimising energy losses.

In regards to design, this 5,500W server redundant power supply employs the company's soft-switching technology and an advanced circuit topology in the PFC stage, further improving overall power efficiency, thermal performance, and optimal conversion. Third-generation semiconductor power devices, such as SiC or GaN, are also employed in this advanced power supply, and their superior high-efficiency switching characteristics allow the system to operate at higher frequencies, boosting high power density. Compared to the previous generation's 3,000W redundant power supply with a power density of 32W/inch³, the power density of the current 5,500W unit has augmented by nearly 59%, reaching 51W/inch³.