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The power conversion circuit of a three phase Vienna or Modular-Boost switching power factor corrected (PFC) rectifier uses three controlled switches, eighteen diodes and two output split capacitors. Three PFC controller circuits are necessary for conversion circuit's voltage regulation, power factor control and input current waveform improvement. The circuit has been modified to have fewer active...
A new one-switch three phase power factor corrected (PFC) rectifier is presented in this paper. The proposed 3-phase ac-dc converter is based on Ĉuk topology. Proper feedback control of the circuit can maintain high power factor and low input current total harmonic distortion (THD). Use of minimum number of control switch in the proposed power conversion circuit reduces components, drivers drive isolation...
An input switch based modular Single Ended Primary Inductor (SEPIC) three phase AC-DC converter is proposed in this paper. The proposed rectifier has the advantage of step-up/down voltage gain with boost input stage. Input boost stage allows input current shaping accompanied by power factor correction. The topology will also provide possible capacitive isolation of input/output sides of the converter...
A new topology of single-phase SEPIC (Single Ended Primary Inductor Converter) AC-DC converter with low input current THD and high input power factor is proposed. Instead of using a single phase rectifier followed by a boost DC-DC converter, or using a bridge rectifier with two diodes and two switches, the rectifier's input is chopped at high frequency during positive and negative cycles by a single...
New output regulated one-switch boost and boost-buck three phase rectifiers are presented in this paper. Proposed three phase ac-dc converters have power factor correction (PFC) and input current shaping facility in one power stage. Use of minimum number of control switch in each proposed circuit reduces conversion circuit components, drivers and drive isolation circuits, sensors and control circuits...
A three phase Vienna/Modular-Boost rectifier provides only boost voltage gain regulation using three single phase PFC controller to achieve power factor correction and input current waveform improvement. A Buck-Boost voltage gain regulated two switch three phase Ćuk AC-DC converter is considered in this paper with only output voltage feedback control. The proposed circuit has fewer active and passive...
Vienna and Modular three phase Boost power factor correction rectifiers are similar in working principle and performance. In this paper two rectifier schemes are presented as Vienna Rectifiers scheme-1 and scheme-2. A third three phase rectifier scheme, the three phase three switch modular SEPIC rectifier topology is also presented. The SEPIC topology has step-up/down voltage gain characteristic,...
A new three-phase true bidirectional switch is proposed in this paper. This switch consist of a unidirectional switch enclosed in two three phase diode bridges with bidirectional input and output terminals. A family of simple topologies of three-phase AC-AC converters using the true bidirectional switch is possible as direct extension of DC-DC converters having similar operating principle. Steady...
Input current and power factor improvement of single and three-phase rectifiers by switch mode regulators are usually achieved by switching the output of rectifiers. The output switching makes input current high frequency switched, which is filtered by a small filter to get low input current THD at near unity power factor. In this paper a three phase Buck-Boost rectifier is proposed which is regulated...
Two new topologies of single-phase AC-DC converter using Buck and Buck-Boost conversion with low input current THD and high input power factor are proposed. Instead of using a single phase rectifier followed by a boost DC-DC converter, or using a bridge rectifier with two diodes and two switches, the rectifier's input is chopped at high frequency during positive and negative cycles by a single bi-directional...
Two new schemes of 3 phase AC voltage controller are proposed. The proposed AC voltage controllers are based on Buck switch mode topologies. The proposed AC-AC converters have the advantage of input current shaping that provides low input current total harmonic distortion (THD) and high input power factor compared to the conventional AC voltage controllers. Moreover, only a single control switch is...
A new input-switched single-phase high performance bridgeless AC-DC Zeta converter (Inverse SEPIC) topology is proposed. Instead of using a single phase rectifier followed by a boost DC-DC converter, or using a bridge rectifier with two diodes and two switches, the converter's input is chopped at high frequency during positive and negative cycles by a single bidirectional switch to get step-up/step-down...
A new single phase high performance input side switched AC-DC Cuk converter is proposed. A bidirectional switch is formed by a unidirectional semiconductor switch with proper positioning of the bridgeless diodes at the input ac side for power conversion for both positive and negative half cycle. Because of the high frequency input side switching, the power factor of the circuit is inherently corrected...
Input current and power factor improvements of single and three phase rectifiers by switch mode regulators are usually achieved by switching the output of rectifiers. The output switching makes input current high frequency switched, which is then filtered by a small filter to get low THD input current at near unity power factor. In this paper, a three phase cuk rectifier is proposed which is regulated...
A new single phase AC voltage controller based on C´uk topology is proposed. The proposed AC voltage controller has the advantage of input current shaping that provides low input current total harmonic distortion (THD) and high input power factor compared to the conventional AC voltage controllers. Moreover, only a single control switch is necessary for the AC-AC conversion compared to 6 thyristors...
Three schemes of 3 phase AC voltage controller are proposed. The proposed AC voltage controllers are based on Boost and Buck switch mode topologies. The proposed AC-AC converters have the advantage of input current shaping that provides low input current total harmonic distortion (THD) and high input power factor compared to the conventional AC voltage controllers. Moreover, only a single control...
Two topologies of single-phase Buck and Boost AC-DC converters are presented. Instead of using a single phase rectifier followed by a boost dc-dc converter, or using a bridge rectifier with two diodes and two switches, the rectifier's input is chopped at high frequency during positive and negative cycles by a bi-directional switch in each of the Boost and Buck conversion mode to get step-up or step-down...
A new circuit is proposed for single phase AC-AC conversion using Boost topology. Input Power factor, input current Total Harmonic Distortion (THD) and efficiency of the circuit are examined for the proposed circuit for different duty cycles. As the output is boosted pwm chopped in ac supply, the voltage gain of the converter has both Buck and Boost characteristics. A single bidirectional switch is...
Two new topologies of Buck-Boost single-phase ac-ac conversion are proposed. In one of the circuits a bi-directional switch with a single buck-boost inductor is used, whereas, in the other circuit a bi-directional switch with two separate buck-boost inductors are used. Both the circuits operate in buck-boost mode separately for positive and negative cycle of the supply. As a result the input current...
Magnetic resonance angiography (MRA) produces images of flowing blood. The intensity in these images is proportional to the velocity of the flow. It produces an image, which distinguishes between static and flowing blood. There are three general types of MRA, time-of-flight, phase contrast angiography, and contrast enhanced angiography.
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