Topic
Precision rectifier
About: Precision rectifier is a research topic. Over the lifetime, 4952 publications have been published within this topic receiving 63668 citations. The topic is also known as: super diode.
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TL;DR: This study focuses on the mathematical modelling of a three-phase Z -source boost rectifier for power factor correction power supply applications; using such a topology as first-stage converter allows designing the second-stage converters with the same voltage constraints of single-phase units.
Abstract: Z -source converter configurations make it possible to overcome intrinsic limits present in conventional ac-dc and dc-ac converters. A typical three-phase inverter cannot supply output voltages greater than the voltages at its input; in the same manner, a typical three-phase boost rectifier cannot supply output voltages lower than input voltages. Using Z -source topology permits overcoming both these limits. In fact, a Z -source boost rectifier can theoretically either step-up or step-down the output voltage to any desired value starting from the conventional three-phase diode bridge rectifier output voltage level. In addition, it presents intrinsic immunity to shoot-through states, resulting in improved reliability of the entire system. In this study, attention is focused on the mathematical modelling of a three-phase Z -source boost rectifier for power factor correction power supply applications; using such a topology as first-stage converter allows designing the second-stage converters with the same voltage constraints of single-phase units.
19 citations
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14 Jun 2015TL;DR: In this paper, three different three-phase topologies (buck-type, boost-type and buck-boost-type) are investigated and studied in terms of their suitability for TRUs.
Abstract: The impending trends in the global demand of more-electric-aircrafts with higher efficiency, high power density, and high degree of compactness has opened up numerous opportunities in front of avionic industry to develop innovative power electronic interfaces. Traditionally, passive diode-bridge based transformer rectifier units (TRU) have been used to generate a DC voltage supply from variable frequency and variable voltage AC power out of the generators. These topologies suffer from bulky and heavy low-frequency tranformer size, lack of DC-link voltage regulation flexibility, high degree of harmonic contents in the input currents, and additional cooling arrangement requirements. This work presents an alternative approach to develop TRUs using actively controlled three-phase AC-DC power factor correction (PFC) rectifiers. This work only focuses on the AC-DC stage of a regulated transformer rectifier unit (RTRU). Three different three-phase topologies i.e. buck-type, boost-type and buck-boost-type are investigated and studied in details in terms of their suitability for TRUs.
19 citations
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10 Dec 2002TL;DR: In this article, a wide input range active multipulse rectifier for utility interface of power electronic converters is proposed, which combines a multi-pulse method using a Y-/spl Delta/ transformer and boost rectifier modules.
Abstract: In this paper, a wide input range active multipulse rectifier for utility interface of power electronic converters is proposed. The scheme combines a multi-pulse method using a Y-/spl Delta/ transformer and boost rectifier modules. A current control scheme for the rectifier modules is proposed to achieve sinusoidal line currents in the utility input over a wide input range of input voltage and output load conditions. A design example is included for a 208 V to 460 V input, 750 V/sub dc/, 10 kW output rectifier system. Input current THD is less than 5% for almost no load to full load conditions. Simulation results are shown.
19 citations
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TL;DR: In this paper, the authors proposed and analyzed a few types of control and protection schemes for the generator, and the minimum time required to restore full power subsequent to a DC line fault is studied for each scheme.
Abstract: The application of a diode bridge rectifier unit connected to a generator feeding a sending-end HVDC station shows a substantial reduction in the station cost. One of the major problems of this configuration is its slow recovery from a DC line fault. The authors propose and analyze a few types of control and protection schemes for the generator. The minimum time required to restore full power subsequent to a DC line fault is studied for each scheme. The results of a digital computer study are presented, as are some results obtained from a real-time physical component HVDC simulator. >
19 citations
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18 Nov 2011TL;DR: In this work a cross-coupled MOSFET based LC oscillator structure has been presented as a modified rectifier circuit that can achieve 75% PCE compared to the conventional full bridge CMOS rectifier of only 3%PCE.
Abstract: Biomedical implants have been developed in the recent years with a focus for continuous and real-time monitoring of physiological parameters. Battery-less operation of the implanted unit requires energy harvesting from an inductive link or from the neighboring environment. For efficient conversion of harvested energy to a usable DC level, a rectifier block is employed. However conventional CMOS full bridge rectifier incurs a significant amount of power loss and lowers the overall efficiency of the powering system. In this work a cross-coupled MOSFET based LC oscillator structure has been presented as a modified rectifier circuit. Cross-coupled structure minimizes the loss of the MOS switches and LC tank circuit boosts up the output DC level. The rectifier unit has been designed and simulated using 0.5-µm standard CMOS process. For simulation purposes, different biomedical frequency bands are used to validate the effectiveness of the proposed circuit. Simulation results show that the proposed rectifier circuit can achieve 75% PCE compared to the conventional full bridge CMOS rectifier of only 3% PCE.
18 citations