A single stage 54V to 1.8V multi-phase cascaded buck voltage regulator module

Leong, Kennith Kin; Deboy, G.; Krischan, Klaus; Muetze, Annette

doi:10.1109/apec.2015.7104617

Cited by 23 publications

(6 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, high light load efficiency and fast response ability under high load transients (>1000A/μs) are another two major concerns. The existing 48‐V VRM solutions 4–31 can be classified into two categories: single‐stage and two‐stage approaches.…”

Section: Introductionmentioning

confidence: 99%

A novel two‐stage solution for low‐power 48‐V voltage regulator module (VRM) using high step‐down hybrid LLC with integrated planar transformer

Lu,

Ma,

et al. 2023

Circuit Theory & Apps

View full text Add to dashboard Cite

SummaryIn this paper, a novel two‐stage solution based on a 1‐MHz high step‐down hybrid LLC converter is proposed for low‐power 48 V voltage regulator modules (VRM). Since the hybrid LLC DCX converter with high step‐down ability is employed as the first‐stage, lower bus voltage can be obtained with the same transformer turns, which contributes to enhancing the duty cycle and efficiency of the second‐stage multi‐phase buck converter. Thus, an overall efficiency improvement can be achieved in the proposed two‐stage system, especially in low‐power applications. To further improve efficiency and power density, a novel integrated planar transformer is adopted for the double resonant tanks of the hybrid LLC converter. To validate the analysis, a 150‐W hardware prototype of the hybrid LLC converter is constructed in the laboratory. To ensure a fair comparison with existing LLC DCX designs, the output voltage is set at 6 V. The measured efficiency results of the first‐stage demonstrate an efficiency advantage at low power output levels compared to the similar full bridge LLC designs, especially at an output of around 100 W. Under the nominal 48‐V input, the first‐stage achieves a peak efficiency of 98.5% and a full load efficiency of 94.62%. Furthermore, a 4‐phase buck converter with nominal 6‐V input and 1.6‐V output is constructed to evaluate the efficiency performance of the overall system. When the second stage operates at 500 kHz, the proposed two‐stage system achieves a peak efficiency of 93.2% at 40A load, while maintaining an efficiency of 91.2% at 65A output. The calculated efficiency of the proposed two‐stage solution exhibits higher performance compared to the majority of single‐stage schemes.

show abstract

Section: Introductionmentioning

confidence: 99%

A novel two‐stage solution for low‐power 48‐V voltage regulator module (VRM) using high step‐down hybrid LLC with integrated planar transformer

Lu,

Ma,

et al. 2023

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…Theoretically, the single‐stage conversion can achieve higher overall efficiency with higher power‐density. This approach mainly involves the current‐tripler converter, 10,11 cascaded buck, 12 hybrid switch capacitor multi‐phase buck, 13,14 quasi‐resonant converter with a current‐doubler rectifier, 15,16 sigma‐delta, 8 three‐level half‐bridge with current doubler, 17 half‐bridge with current doubler, 18 and so on. Unfortunately, the efficiency of the single‐stage solution is not only not high as desired, but also the isolation function is lost in cascaded buck, hybrid switch capacitor multi‐phase buck, quasi‐resonant converter with a current‐doubler rectifier, and sigma‐delta because of safety and noise requirements.…”

Section: Introductionmentioning

confidence: 99%

A novel hybrid half‐bridge LLC resonant converter with double resonant tanks for high step‐down applications

et al. 2022

Circuit Theory & Apps

View full text Add to dashboard Cite

Conventional half‐bridge (HB) LLC converters have been a good candidate for the first stage in the two‐stage conversion structure because of its high conversion efficiency and high frequency operation ability. However, the voltage gain is only 0.5 exclusive of the transformer, resulting in the reduced efficiency for high step‐down applications. In order to solve this issue, in this paper, a novel hybrid HB LLC converter with double resonant tanks is firstly presented for high step‐down ratio applications. The distinctive features of the proposed converter are as follows: (1) the voltage gain of 0.25 is achieved by incorporating the switched capacitor circuit. Thus, the primary turns number for the transformer is halved compared with conventional HB LLC converters. Correspondingly, the smaller primary side winding losses and transformer volume can be implemented. (2) The power splitting and low input current ripple can be obtained due to the employed double resonant tanks. Thus, the uniform thermal distribution and low input filter capacitance are the second advantage for the proposed converter. (3) Soft switching over the entire operation range still can be maintained with larger magnetics inductance. The detailed operation principles, circuit analysis, and resonant tank design for the proposed converter are introduced and presented. A hardware prototype with 36–60 V input, 3 V/50 A‐output is built to demonstrate the declared features of the proposed hybrid converter.

show abstract

“…Cascading the input voltages of buck converter in series and paralleling their output was the method proposed by Leong et al [13]. The analysis and design of a dc step up converter with low current stress by integrating the concepts of multi-phase and multi-stage scheme was presented by Retana et al [14].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Dual Phase Dual Stage Boost Converter for Photovoltaic Applications

Suraj¹,

Jijesh²,

Soman³

2020

Int. J. Adv. Sci. Eng. Inf. Technol.

View full text Add to dashboard Cite

In the previous two decades, the depletion of fossil fuels has led to applications with renewable energy sources. The approach for renewable energy application is to achieve eminent static boost ratio from with miniaturized ripple content in both current and voltage. The novel converter discussed in this paper is derived by combining the concept of interleaving and cascading of boost converters. The presented design has a dual phase boost converter followed by a stage of boost converter which as a whole acts like dual phase dual stage boost converter. The interleaving concept is utilized in dual phase boost converter to reduce the voltage current stress created in boosting process and its output is boosted by the dual stage boost converter which improves overall efficiency with respect to the existing systems. The converter is designed for a power rating of 200W with output voltage of 192V for an input voltage of 12V obtained from photovoltaic source at a switching frequency of 50KHz this illustrate the advantages over other existing converters . The different parameters of the proposed boost converter are contrasted with that of a conventional boost converter. Furthermore, the simulations results of the proposed converter are presented to validate the system design. The results exhibit that this converter achieves a predominant performance over other dc-dc boost converters by offering improved efficiency and voltage gain, while having lower input current ripple.

show abstract

A single stage 54V to 1.8V multi-phase cascaded buck voltage regulator module

Cited by 23 publications

References 1 publication

A novel two‐stage solution for low‐power 48‐V voltage regulator module (VRM) using high step‐down hybrid LLC with integrated planar transformer

A novel two‐stage solution for low‐power 48‐V voltage regulator module (VRM) using high step‐down hybrid LLC with integrated planar transformer

A novel hybrid half‐bridge LLC resonant converter with double resonant tanks for high step‐down applications

Analysis of Dual Phase Dual Stage Boost Converter for Photovoltaic Applications

Contact Info

Product

Resources

About