A ZVS‐ZCS phase shift full bridge DC‐DC converter with secondary‐side control for battery charging applications

Summary The output power requirement of battery charging circuits can vary in a wide range, hence making the use of conventional phase shift full bridge DC‐DC converters infeasible because of poor light load efficiency. In this paper, a new ZVS‐ZCS phase shift full bridge topology with secondary‐sid...

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Bibliographic Details
Published in:International journal of circuit theory and applications 2018-07, Vol.46 (7), p.1407-1415
Main Author: Saeed, Junaid
Format: Article
Language:English
Subjects:
Active control
Battery chargers
Charging
Circadian rhythm
Converters
DC‐DC converter
Diodes
Electric potential
full bridge
Inductance
Phase shift
Rectifiers
secondary‐side control
Switches
Switching
ZCS
ZVS
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Summary:Summary The output power requirement of battery charging circuits can vary in a wide range, hence making the use of conventional phase shift full bridge DC‐DC converters infeasible because of poor light load efficiency. In this paper, a new ZVS‐ZCS phase shift full bridge topology with secondary‐side active control has been presented for battery charging applications. The proposed circuit uses 2 extra switches in series with the secondary‐side rectifier diodes, operating with phase shift PWM. With the assistance of transformer's magnetizing inductance, the proposed converter maintains zero voltage switching (ZVS) of the primary‐side switches over the entire load range. The secondary‐side switches regulate the output voltage/current and perform zero current switching (ZCS) independent of the amount of load current. The proposed converter exhibits a significantly better light load efficiency as compared with the conventional phase shift full bridge DC‐DC converter. The performance of the proposed converter has been analyzed on a 1‐kW hardware prototype, and experimental results have been included. This letter proposes a new topology to improve the light load efficiency of phase shift full bridge DC‐DC converter. The proposed topology uses 2 extra switches in series with the rectifier diodes at the secondary side of the isolation transformer. The magnetizing inductance aids in achieving zero voltage switching of the primary switches in the entire load range. The secondary switches also work under zero current switching.
ISSN:0098-9886
1097-007X
DOI:10.1002/cta.2479