Abstract
A full-bridge converter with an additional resonant circuit and variable secondary turns is presented and achieved to have soft-switching operation on active devices, wide voltage input operation and low freewheeling current loss. The resonant tank is linked to the lagging-leg of the full bridge pulse-width modulation converter to realize zero-voltage switching (ZVS) characteristic on the power switches. Therefore, the wide ZVS operation can be accomplished in the presented circuit over the whole input voltage range and output load. To overcome the wide voltage variation on renewable energy applications such as DC wind power and solar power conversion, two winding sets are used on the output-side of the proposed converter to obtain the different voltage gains. Therefore, the wide voltage input from 90 to 450 V (Vin,max = 5Vin,min) is implemented in the presented circuit. To further improve the freewheeling current loss issue in the conventional phase-shift pulse-width modulation converter, an auxiliary DC voltage generated from the resonant circuit is adopted to reduce this freewheeling current loss. Compared to the multi-stage DC converters with wide input voltage range operation, the proposed circuit has a low freewheeling current loss, low switching loss and a simple control algorithm. The studied circuit is tested and the experimental results are demonstrated to testify the performance of the resented circuit.
Highlights
IntroductionFor the elimination of the air pollution and emission of greenhouse gases, clean renewable energy sources with power electronic techniques have been investigated and developed for fuel cell [1,2], wind power [3,4], solar power [5,6] and battery storage system [7] applications
For the elimination of the air pollution and emission of greenhouse gases, clean renewable energy sources with power electronic techniques have been investigated and developed for fuel cell [1,2], wind power [3,4], solar power [5,6] and battery storage system [7] applications.Solar power [8,9] is one of the most attractive clean energy sources
The synchronous rectifiers with the phase-shift pulse-width modulation (PSPWM) scheme are adopted on the secondary side to control load voltage
Summary
For the elimination of the air pollution and emission of greenhouse gases, clean renewable energy sources with power electronic techniques have been investigated and developed for fuel cell [1,2], wind power [3,4], solar power [5,6] and battery storage system [7] applications. The other problems of this circuit topology are the output power and zero voltage switching (ZVS) range on active devices are related to the input voltage. In [14], a hybrid converter with a half-bridge PWM circuit and boost circuit was presented to achieve about 2:1 (Vin = 45 V–75 V) input voltage operation. Eight active devices and eight rectifier diodes are needed to have a 4:1 voltage operation This circuit topology uses more power semiconductors that will reduce the circuit reliability and increase the cost. Compared to the conventional PWM converters, the advantages of the presented converter are low switching loss, low primary freewheeling current, wide input voltage operation and a simple control scheme.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
