Simple estimating method for voltage fluctuation in paralleled converter system with optimized on-off control

This paper proposes a simple circuit model to estimate output voltage fluctuation in paralleled converter system with optimized on-off control. The optimized on-off control method changes the number of active converter modules to minimize power losses in paralleled system according to load current. However, it causes voltage fluctuation in transient response. Output voltage fluctuation due to the on-off control is estimated with proposed simple circuit model. The estimation is verified by accurate circuit simulation. Simple guideline for circuit components is also given to meet a specific output voltage tolerance.

[1]  Tamotsu Ninomiya,et al.  Load-current-sharing control for parallel operation of DC-to-DC converters , 1993, Proceedings of IEEE Power Electronics Specialist Conference - PESC '93.

[2]  T. Kohama,et al.  Estimation of optimized switching points for on-off module control in paralleled converter system , 2013, 2013 IEEE 10th International Conference on Power Electronics and Drive Systems (PEDS).

[3]  Tamotsu Ninomiya,et al.  Dynamic analysis of parallel-module converter system with current balance controllers , 1994, Proceedings of Intelec 94.

[4]  Slobodan Cuk,et al.  A general unified approach to modelling switching-converter power stages , 1976, 1970 IEEE Power Electronics Specialists Conference.

[5]  Satoshi Tsuji,et al.  Design of optimized on-off control to improve efficiency of paralleled converter system , 2014, 2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA).

[6]  Yim-Shu Lee,et al.  Parallel operation of DC-DC converters with synchronous rectifiers , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).