A New Standby Structure Based on a Forward Converter Integrated With a Phase-Shift Full-Bridge Converter for Server Power Supplies

Cho, Shin-Young; Lee, Il-Oun; Kim, Jae-Kuk; Moon, Gun-Woo

doi:10.1109/tpel.2012.2195507

Cited by 53 publications

(12 citation statements)

References 14 publications

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“…For these reasons, standby-flyback-integrating structures have been studied in recent years [15][16][17][18][19][20]. By integrating the flyback converter into the main power conversion stage, these works reduced switching losses, resulting in the improved efficiency of the system.…”

Section: The Proposed Structure and Its Control Schemementioning

confidence: 99%

“…In this case, only a small output power is required to monitor the system status, so only the standby flyback converter with a small output power rating provides the standby output power. For the standby output, the flyback converter is widely used because of its small size and wide input-range capability [15][16][17][18]. Since Vout_STB should be regulated tightly, it is used for the feedback of the duty cycle of the standby converter.…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that the losses of the standby flyback converter always exist regardless of operating mode. Therefore, the standby converter degrades the total system's efficiency in entire load conditions [15][16][17][18][19][20]. Therefore, it is required to reduce the losses from the standby flyback converter.…”

Section: Introductionmentioning

confidence: 99%

“…By integrating the flyback converter into the main power conversion stage, these works reduced switching losses, resulting in the improved efficiency of the system. However, approaches in [15][16][17] require additional components and complex control signals. Also, the core loss of the flyback converter is always produced.…”

Section: Introductionmentioning

confidence: 99%

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Standby-Loss Elimination in Server Power Supply

2017

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Abstract:In a server power system, a standby converter is required in order to provide the standby output, monitor the system's status, and communicate with the server power system. Since these functions are always required, losses from the standby converter are produced even though the system operates in normal mode. For these reasons, the losses deteriorate the total efficiency of the system. In this paper, a new structure is proposed to eliminate the losses from the standby converter of a server power supply. The key feature of the proposed structure is that the main direct current (DC)/DC converter substitutes all of the output power of the standby converter, and the standby converter is turned off in normal mode. With the proposed structure, the losses from the standby converter can be eliminated in normal mode, and this leads to a higher efficiency in overall load conditions. Although the structure has been proposed in the previous work, very important issues such as a steady state analysis, the transient responses, and how to control the standby converter are not discussed. This paper presents these issues further. The feasibility of the proposed structure has been verified with 400 V link voltage, 12 V/62.5 A main output, and a 12 V/2.1 A standby output server power system.

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Section: The Proposed Structure and Its Control Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Standby-Loss Elimination in Server Power Supply

2017

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“…Full-bridge converters with a simple structure, constant frequency pulse-width modulation and soft switching turn-on [1]- [4] have been adopted in medium power applications. However, power switches should suffer the input voltage due to the full-bridge structure.…”

Section: Introductionmentioning

confidence: 99%

Medium Voltage Resonant Converter with Balanced Input Capacitor Voltages and Output Diode Currents

Lin¹,

Du²

2015

Journal of Power Electronics

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This paper presents a 1.92 kW resonant converter for medium voltage applications that uses low voltage stress MOSFETs (500V) to achieve zero voltage switching (ZVS) turn-on. In the proposed converter, four MOSFETs are connected in series to limit the voltage stress of the power switches at half of the input voltage. In addition, three resonant circuits are adopted to share the load current and to reduce the current stress of the passive components. Furthermore, the transformer primary and secondary windings are connected in series to balance the output diode currents for medium power applications. Split capacitors are adopted in each resonant circuit to reduce the current stress of the resonant capacitors. Two balance capacitors are also used to automatically balance the input capacitor voltage in every switching cycle. Based on the circuit characteristics of the resonant converter, the MOSFETs are turned on under ZVS. If the switching frequency is less than the series resonant frequency, the rectifier diodes can be turned off under zero current switching (ZCS). Experimental results from a prototype with a 750-800 V input and a 48V/40A output are provided to verify the theoretical analysis and the effectiveness of the proposed converter.

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A High‐Frequency‐Link Secondary‐Side Phase‐Shifted ZVS‐PWM DC–DC Converter with ZCS Active Rectifier

Mishima

Nakaoka

2015

Electrical Engineering Japan

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Performance evaluations of a secondary-side phase shift (SPS) pulse-width-modulation (PWM)-controlled zero-voltage soft-switching (ZVS) dc-dc converter with a zero current soft-switching (ZCS) active rectifier are presented in this paper. In the proposed dc-dc converter, soft-switching operations are achievable from full to null loads by utilizing the parasitic inductances of the highfrequency (HF) transformer. In addition, no circulating current emerges in either the primary-or secondary-side fullbridge circuits, and thus the related idling power losses can be minimized. In this paper, the soft-switching operations over the wide-range load variations are verified, and the characteristics of output power and voltage versus phaseshift angle regulations are demonstrated in an experiment based on a 1 kW to 50 kHz laboratory prototype of the proposed dc-dc converter. Furthermore, the converter power losses, which include the switching and conduction power losses, are analyzed, after which the effectiveness of the proposed dc-dc converter is evaluated from a practical point of view. C⃝ 2015 Wiley Periodicals, Inc. Electr Eng Jpn, 192(1): 45-60, 2015; Published online in Wiley Online Library (wileyonlinelibrary.com).

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A New Standby Structure Based on a Forward Converter Integrated With a Phase-Shift Full-Bridge Converter for Server Power Supplies

Cited by 53 publications

References 14 publications

Standby-Loss Elimination in Server Power Supply

Standby-Loss Elimination in Server Power Supply

Medium Voltage Resonant Converter with Balanced Input Capacitor Voltages and Output Diode Currents

A High‐Frequency‐Link Secondary‐Side Phase‐Shifted ZVS‐PWM DC–DC Converter with ZCS Active Rectifier

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