Wireless PWM control of a parallel DC-DC buck converter

We demonstrate a new concept for wireless pulse-width modulation (PWM) control of a parallel dc-dc buck converter. It eliminates the need for multiple physical connections of gating/PWM signals among the distributed converter modules. The new scheme relies on radio-frequency (RF) based communication of the PWM control signals from a master to the slave modules. We analyze the system stability and demonstrate the experimental effectiveness of the wireless control scheme for a two-module parallel buck converter for 10-kHz and 20-kHz switching frequencies and for channel lengths of 1.5 and 15ft, respectively. The proposed control concept may lead to easier distributed control implementation of parallel dc-dc converters and distributed power systems, and may lead to redundancy that is achievable using droop method. It may also be used as a backup for wire-based control of parallel converters to provide fault tolerance.

[1]  Gurjit Singh Thandi.  Modeling, Control and Stability Analysis of a PEBB Based DC Distribution Power System , 1997 .

[2]  M. Jordan.  UC3907 LOAD SHARE IC SIMPLIFIES PARALLEL POWER SUPPLY DESIGN , 1999 .

[3]  Fred C. Lee,et al.  The circulating current in paralleled three-phase boost PFC rectifiers , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[4]  D. Perreault,et al.  Frequency-based current-sharing techniques for paralleled power converters , 1996, PESC Record. 27th Annual IEEE Power Electronics Specialists Conference.

[5]  S.K. Mazumder,et al.  "Wireless" control of spatially distributed power electronics , 2005, Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005..

[6]  C. Q. Lee,et al.  Current distribution control of converters connected in parallel , 1990, Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting.

[7]  Dushan Boroyevich,et al.  Theoretical and experimental investigation of the fast- and slow-scale instabilities of a DC-DC converter , 2001 .

[8]  Fred C. Lee,et al.  Modeling, analysis, and design of PWM converters , 1990 .

[9]  G. Joos,et al.  A novel approach to paralleling of power converter units with true redundancy , 1990, 21st Annual IEEE Conference on Power Electronics Specialists.

[10]  Ali H. Nayfeh,et al.  Robust control of parallel DC-DC buck converters by combining integral-variable-structure and multiple-sliding-surface control schemes , 2002 .

[11]  Chingchi Chen,et al.  Characterization of power electronics EMI emission , 2003, 2003 IEEE Symposium on Electromagnetic Compatibility. Symposium Record (Cat. No.03CH37446).

[12]  G. C. Verghese,et al.  Stability analysis of paralleled DC/DC converters with active current sharing , 1996, PESC Record. 27th Annual IEEE Power Electronics Specialists Conference.