Sensorless current-mode control of a digital dead-beat DC-DC converter

A digital current-mode controller for dc-dc converters is introduced. The current-mode loop is sensorless, relying on constants and internal loop states; removing the need to sense controlled voltages or currents for the inner loop. Furthermore, a fast current-mode control mechanism is implemented by utilizing dead-beat control. The resulting controller is robust and surprisingly uncomplicated. It is well suited to VLSI integration in a low geometry process. An interesting aspect of this control scheme is that it facilitates the application of a low resolution PWM.

[1]  A. Prodic,et al.  Digital PWM controller and current estimator for a low-power switching converter , 2000, COMPEL 2000. 7th Workshop on Computers in Power Electronics. Proceedings (Cat. No.00TH8535).

[2]  Aleksandar Prodic,et al.  Predictive digital current programmed control , 2003 .

[3]  S. V. Mollov,et al.  Modelling and control of DC-DC converters , 1998 .

[4]  Aleksandar Prodic,et al.  Design and implementation of a digital PWM controller for a high-frequency switching DC-DC power converter , 2001, IECON'01. 27th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.37243).

[5]  Stéphane Bibian,et al.  High performance predictive dead-beat digital controller for DC power supplies , 2001, APEC 2001. Sixteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.01CH37181).

[6]  Stéphane Bibian,et al.  High performance predictive dead-beat digital controller for DC power supplies , 2002 .

[7]  Robert W. Erickson,et al.  Fundamentals of Power Electronics , 2001 .

[8]  L. H. Dixon,et al.  Average current mode control of switching power supplies , 1990 .

[9]  Seppo J. Ovaska,et al.  Digital control of power supplies-opportunities and constraints , 1998, IECON '98. Proceedings of the 24th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.98CH36200).

[10]  Katsuhiko Ogata,et al.  Discrete-time control systems (2nd ed.) , 1995 .

[11]  Seth R. Sanders,et al.  Quantization resolution and limit cycling in digitally controlled PWM converters , 2003 .

[12]  P. Midya,et al.  Sensorless current mode control-an observer-based technique for DC-DC converters , 1997, PESC97. Record 28th Annual IEEE Power Electronics Specialists Conference. Formerly Power Conditioning Specialists Conference 1970-71. Power Processing and Electronic Specialists Conference 1972.