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A novel high efficiency polymorphic topology converter whose input range extends to 200~800 Vdc, while the high line input efficiency is still maintained is presented in this paper. By integrated a novel three-level HB L2C converter and a conventional PSFB converter together, the proposed converter intelligently estimate the input voltage condition and automatically change its internal topology forms...
A generic model of a double bridge "AC inductor" based Gyrator-behaved APFC is presented, analyzed and verified by simulation and experiments. Based on the results of the study, a design procedure is developed for specifying the control law and the optimal parameters for ZVS and minimum conduction losses of the proposed APFC. The proposed APFC requires neither line voltage, nor input current...
A novel ZVZCS L2C-Type parallel resonant converter is presented in this paper. This converter, compared with the Type-4 LLC converter, narrows the switching frequency deviation under wide input voltage range applications, while maintaining all soft-switching advantages as ZVS for primary switches and ZCS for output rectifiers, both of which eases design for input EMI filter. In addition, the proposed...
Active clamped asymmetrical dual switch forward (ACADSF) converter is a preferable candidate standard dc-dc module for high line and wide range input application in low to medium power rating systems. To make the ACADSF be more suitable for practical applications, a novel ACADSF converter was proposed, which, compared with original ACADSF, maintains the advantages that duty cycle can be more than...
A conventional active-clamp forward (ACF) converter is a favorable candidate in low-to-medium power applications because of its simple structure and zero-voltage switching (ZVS) capability. However, high voltage stress on switches, i.e., sum of the input voltage and the reset capacitor voltage, does not make it suitable for high input voltage applications such as a front-end converter of which the...
In this paper, the general operation principles for the existing control type ZVT PWM dual switch forward converters which possess the same conversion ration are reviewed and their advantages and drawbacks are discussed in detail. Then the control type ZVS techniques of active-clamp and resonant reset are extended to the other dual switch forward converters by whether employing the input for resetting...
The paper presents an innovative off-line low profile converter design that delivers 750 W of power at 95%-96% efficiency for nominal input range, using variable frequency topology with high frequency zero voltage switching (ZVS) and zero current switching (ZCS) for primary switchers. Theoretical considerations and practical results are presented for high frequency and high voltage soft-switching...
In this paper, a new bidirectional three-phase dc-dc converter and three-phase PWM strategies have been proposed for battery application. The proposed converter acts as an three-phase isolated buck converter when battery is charged from dc link (buck mode) and an three-phase isolated boost converter when battery discharges energy (boost mode). In the buck mode, three-phase hybridge rectifier is employed...
The MVAC-SVM controlled three-phase boost rectifier can realize ZVS operation for all switching devices. SVM can be realized with switch device operating at the fixed switching frequency. And the switching voltage stress of all the power switch devices is equal to the DC link voltage. In this paper, a minimum voltage active clamping zero voltage switching SVM controlled three phase boost rectifier...
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