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Three new bridgeless single phase ac-dc power factor correction (PFC) rectifiers based on Cuk topology are proposed. The absence of an input diode bridge and the presence of only two semiconductor switches in the current flowing path during each switching cycle result in less conduction losses and an improved thermal management compared to the conventional Cuk PFC converter. The proposed topologies...
This paper focuses on a new single-phase AC-DC buck converter which has ability to operate with wide line voltage range at near unity power factor. This converter is composed of two controllable power switches and fast switching diodes. This converter is operated at constant switching frequency with variable duty cycle, using a very simple control scheme in voltage follower mode. Neither an analog...
International standards impose several constraints concerning the electric power quality and require that the harmonic content of the line current of grid connected equipment is below assigned limits. The most commonly used structure of a grid connected power supply consists of a diode bridge rectifier, a dc-dc converter used to shape the input current to sinusoidal form and a second dc-dc converter...
This paper proposes a new bridgeless single-stage half-bridge ac-dc converter. The proposed converter integrates the operation of the bridgeless power factor correction (PFC) boost rectifier and the asymmetrical pulse-width modulation (APWM) half-bridge dc-dc converter. The proposed converter provides high power factor and direct power conversion from the line voltage to an isolated dc output voltage...
One of the major drawbacks of high-ratio step-up transformers is the high value of their secondary side capacitor. This value is reflected at the primary side giving rise to a non-desirable one. There are some converters which include this capacitor in the topology and can cope with it, and even more, they need it. Particularly, in high-voltage applications, we will find transformers with a large...
Unlike existing single-stage AC/DC converters with uncontrolled intermediate bus voltage, a new single-stage AC/DC converter achieving power factor correction (PFC), intermediate bus voltage output regulation and output voltage regulation is proposed. The single power stage circuit is formed by integrating a boost PFC converter with a two-switch-clamped forward converter. The current stress of the...
A Zeta mode three-level AC/AC converter is proposed, the converter is available in high input voltages as well as in high power applications, and it also intended for use in applications where a sinusoidal output voltage of high quality is needed. It realizes the three-level voltage waveforms before output filter, which can get a better spectrum and reduce bulk of the filter. Compared with non-isolation...
For the sake of energy saving, harmonic current suppression and drive performance improvement, inverter-fed air-conditioner drive systems are used more and more extensively, and the selected motors include ASM,BLDCM and PMSM. Generally, the front stage AC/DC converter of inverter aircon is complete active power factor corrector (PFC), which can bring about better correction effects. Whereas the traditional...
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