A secondary side phase-shift-controlled llc resonant converter with reduced conduction loss at normal operation for hold-up time compensation application

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Published on September 30, 2015

Author: nagesh024

Source: slideshare.net

1. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 1 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com A Secondary-Side Phase-Shift-Controlled LLC Resonant Converter with Reduced Conduction Loss at Normal Operation for Hold-Up Time Compensation Application Abstract During the hold-up time, i.e., during the ac line dropout, the energy of the front-end dc/dc converter is provided by the bulky link capacitors. To minimize the size of the hold-up time capacitors and to reduce the cost and improve the power density, a requirement for the front-end dc–dc converter is that it should be able to provide regulated output voltage in a wide input voltage range. There have been many topologies proposed for the front-end dc–dc converter. Among them, the LLC resonant converter is the most attractive topology due to its excellent soft- switching performance and voltage step-up capability. Generally, the normal operation point is designed at the series- resonant frequency to maximize the efficiency and realize unity voltage gain.

2. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 2 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Existing system The switching bridge generates a square waveform to excite the LLC resonant tank, which will output a resonant sinusoidal current that gets scaled and rectified by the transformer and rectifier circuit, the output capacitor filters the rectified ac current and outputs a DC voltage. First, it can regulate the output over wide line and load variations with a relatively small variation of switching frequency. Second, it can achieve zero voltage switching (ZVS) over the entire operating range. Finally, all essential parasitic elements, including junction capacitances of all semiconductor devices and the leakage inductance and magnetizing inductance of the transformer, are utilized to achieve ZVS. Proposed system To maximize the efficiency of normal operation point and provide sufficient voltage gain for the hold-up time requirement, an improved LLC resonant converter with SS-PSC is proposed in this letter. The proposed converter always operates at the series-resonant frequency. Voltage step-up during hold-up time is realized with phase-shift control rather than variable frequency. As a result, when designing the magnetizing inductor, only the achievement of soft-switching is considered,

3. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 3 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com which can help to reduce the circulating current and maximize the efficiency at the normal operation. Advantages  Reduce the circuiting current-related conduction loss. Applications  Distributed power systems.  Server power supplies.

4. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 4 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Block diagram BUFFER circuit 5VDC PIC controller circuit Gate driver circuit 12 V DC Input DC supply Load Full bridge converter LLC circuit High frequency transformer Control rectifier Filter

5. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 5 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Tools and software used  MPLAB – microcontroller programming.  ORCAD – circuit layout.  MATLAB/Simulink – Simulation.

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