A novel switched-capacitor based partial power architecture for a 20 MHz resonant SEPIC

This paper presents a new switched-capacitor (SC) based partial power architecture which enhances the performance of resonant dc-dc converters operating at high frequency (HF, 3 MHz-30 MHz) and very high frequency (VHF, above 30 MHz). A wider input and output range, larger voltage conversion ratio, smaller size and excellent transient performance are expected. The prototype comprises of a 20MHz resonant single-ended-primary-inductor-converter (SEPIC) as a regulated stage and a high-efficiency (96.5 %) 200 kHz SC as an unregulated stage. The resonant SEPIC handles 30 % of total the input power while regulates the output using a high bandwidth (170 kHz) ON/OFF PWM control scheme, which enables fast transient responses. The high-efficiency SC processes 70 % of the input power and provides a large voltage conversion ratio. The low energy storage requirements of the proposed converters allow the use of air-core inductors and ceramic capacitors, thereby eliminating magnetic core loss, and short-lived electrolytic capacitors. The power stage of the prototype achieves a peak efficiency of 93.7 % and a power density of 705.86 W/in3 at 93.88 W.

[1]  Yehui Han,et al.  PV balancers: Concept, architectures, and realization , 2012, 2012 IEEE Energy Conversion Congress and Exposition (ECCE).

[2]  Yehui Han,et al.  Design of module-integrated converters for photovoltaic strings , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[3]  Yehui Han,et al.  Quasi-parallel switched-capacitor and regulating PWM DC-DC converter , 2014, 2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014.

[4]  D.J. Perreault,et al.  New architectures for radio-frequency DC/DC power conversion , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[5]  D.J. Perreault,et al.  Merged two-stage power converterarchitecture with softcharging switched-capacitor energy transfer , 2008, 2008 IEEE Power Electronics Specialists Conference.

[6]  Charles R. Sullivan,et al.  Opportunities and Challenges in Very High Frequency Power Conversion , 2009, 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition.

[7]  Jingying Hu,et al.  High frequency resonant SEPIC converter with wide input and output voltage ranges , 2008, 2008 IEEE Power Electronics Specialists Conference.

[8]  Khurram K. Afridi,et al.  Stacked switched capacitor energy buffer architecture , 2012 .

[9]  D.J. Perreault,et al.  New Architectures for Radio-Frequency DC – DC Power Conversion , 2006 .

[10]  Yehui Han,et al.  Analysis of high efficiency DC/DC converter processing partial input/output power , 2013, 2013 IEEE 14th Workshop on Control and Modeling for Power Electronics (COMPEL).

[11]  D.J. Perreault,et al.  Very High Frequency Resonant Boost Converters , 2007, 2007 IEEE Power Electronics Specialists Conference.