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This paper discusses the techniques, challenges, and results of measuring computer power supply (CPS) efficiency, power factor (PF), and input harmonic currents for the 80 PLUSreg program since its beginning in 2002. To date, over 750 power supplies have been tested with many certified for the 80 PLUSreg program. In spite of the large number of power supplies tested and years of testing, there is...
There is a strong movement in the information technology (IT) industry to reduce the energy consumption of IT equipment. For managing energy consumption in data centers it is important to measure the power consumption of servers and other equipment. The most common approach is to require power supplies to report their input power to the host system. In the past, the input power was often calculated...
The life time of lighting emitting diode (LED) can reach 100,000 hours. Compared to other power supplies, the power supply for LED requires long life time in addition to high efficiency and high power factor. Electrolytic capacitor has the shortest life in switching power supplies. In order to prolong the life time of power supply, it is necessary to reduce the storage capacitance and use other kind...
Flyback switched-mode converters are among the most popular in the low-power range, due to their simplicity and low cost. They are especially popular in multi-output applications, due to the low parts count-one diode and capacitor per output. They would be even more popular if the output regulation were better. This paper reviews the common techniques to tighten the output regulation, and summarizes...
Circuit topologies of single-stage, single-stage combined, single-stage paralled uninterruptible AC-DC converters with high power factor are proposed based on presenting research present states of the single-stage uninterruptible AC-DC converters. This kind of AC-DC converters, which is constituted of full-bridge rectifier and multifunctional integrated flyback converter, can realize uninterruptible...
This paper presents detailed design and comparison of two front-end Dc/Dc converters which are suitable especially for the medium-power level applications with low output voltage and high output current both. Where, the LLC resonant converter drawn more and more attention recently shows its essential advantages in high conversion efficiency and high power density. However, due to the variable-frequency...
In universal-line ac/dc converters that require PFC, maintaining a high efficiency across the entire load range poses a major challenge. Typically, a boost PFC front-end exhibits 1-3% lower efficiency at 100-V line compared to that at 230-V line. It is shown in this paper that a buck PFC front end with an output voltage in the 80-V range can maintain a high-efficiency across the entire line range...
Digital power supplies have gained traction as they provide programmability, ease of use, and higher performance. Powerful modern processors can be leveraged to implement complex control algorithms that lead to higher efficiency and faster transient response. One of the major barriers in adopting digital control for isolated power supplies is the need to send digital rather than analog information...
A control technique is developed for parallel operating inverters with no control interconnections in microgrid. This technique uses only locally measurable feedback signals to allow some independent inverters to share the active power for loads, while the others to provide reactive power compensation for loads, both in proportional to their capacities. Simulation results prove the validity of this...
The large capacity harmonic current generator based on three-phase-four-wire configuration uses four-leg converter as its main circuit. So it is different from the traditional small capacity linear current source. The whole equipment can output steady harmonic current include the selective order harmonic (below 25th order), reactive current and unbalanced current. Besides, dynamic change process of...
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