EPE Association: EPE 2023 - DS2r: Low Voltage DC Power Supplies

EPE 2023 - DS2r: Low Voltage DC Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 09: Industry-Specific Energy Conversion and Conditioning Technologies > EPE 2023 - DS2r: Low Voltage DC Power Supplies

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   A Comprehensive Review on Partial Power Processing-based Voltage Regulator Modules for 48-V Bus-based Data Centers
By Yinxiao ZHU, Yongheng YANG, Frede BLAABJERG [View]
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Abstract: Nowadays, the data center is becoming a large consumer in the electricity market with the blooming of information and communication technologies. To ensure the chip-level power supply, the electric power from the utility must step down to the desired very-low voltage domains, leading to considerable losses in cascaded power conversions. As the interface between the bus bar and load elements, high-performance voltage regulation modules (VRMs) are the cornerstone of greener data centers. Hence, along with the development of power electronics technologies, various converters have been presented in the literature. One of the key issues for data centers is to maintain the voltage balance with high efficiency. In this paper, state-of-the-art partial power processing (PPP)-based VRMs are systematically analyzed and reviewed. Then, a comparative simulation between different control objectives is carried out with four series-connected loads. The results showed that the difference in control objectives will influence both the total and the unit-maximum processing power of the PPP-based system. Additionally, the challenges for future data centers are briefly discussed.

   High Step-Down DC-DC Converter And Results For 48-to-5 V And 400-to-48 V Implementation
By Robert STALA, Szymon FOLMER [View]
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Abstract: This paper presents a novel concept of a DC-DC converter with high step-down of voltage. In theproposed topology the maximum voltage of the inductor is three times lower than in a buck converter. The proposed converter operates with threefold wider duty cycle than the buck at a given voltage gain. Moreover, it provides continuous regulation, low voltage stress across switches, and is adequate for bi-directional GaN transistors use. Its operation, efficiency and power losses analysis are demonstrated at 48-to-5 V and 400-to-48 V case of operation. An effective method for efficiency improvement by the use of an extended converter concept was also demonstrated.

EPE 2023 - DS2r: Low Voltage DC Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 09: Industry-Specific Energy Conversion and Conditioning Technologies > EPE 2023 - DS2r: Low Voltage DC Power Supplies
	[return to parent folder]

	A Comprehensive Review on Partial Power Processing-based Voltage Regulator Modules for 48-V Bus-based Data Centers By Yinxiao ZHU, Yongheng YANG, Frede BLAABJERG	[View] [Download]
Abstract: Nowadays, the data center is becoming a large consumer in the electricity market with the blooming of information and communication technologies. To ensure the chip-level power supply, the electric power from the utility must step down to the desired very-low voltage domains, leading to considerable losses in cascaded power conversions. As the interface between the bus bar and load elements, high-performance voltage regulation modules (VRMs) are the cornerstone of greener data centers. Hence, along with the development of power electronics technologies, various converters have been presented in the literature. One of the key issues for data centers is to maintain the voltage balance with high efficiency. In this paper, state-of-the-art partial power processing (PPP)-based VRMs are systematically analyzed and reviewed. Then, a comparative simulation between different control objectives is carried out with four series-connected loads. The results showed that the difference in control objectives will influence both the total and the unit-maximum processing power of the PPP-based system. Additionally, the challenges for future data centers are briefly discussed.

	High Step-Down DC-DC Converter And Results For 48-to-5 V And 400-to-48 V Implementation By Robert STALA, Szymon FOLMER	[View] [Download]
Abstract: This paper presents a novel concept of a DC-DC converter with high step-down of voltage. In theproposed topology the maximum voltage of the inductor is three times lower than in a buck converter. The proposed converter operates with threefold wider duty cycle than the buck at a given voltage gain. Moreover, it provides continuous regulation, low voltage stress across switches, and is adequate for bi-directional GaN transistors use. Its operation, efficiency and power losses analysis are demonstrated at 48-to-5 V and 400-to-48 V case of operation. An effective method for efficiency improvement by the use of an extended converter concept was also demonstrated.