New Digital Control Architecture Eliminating the Need for High Resolution DPWM

Due to the non-linear quantization effects of A/D converter and digital pulse-width modulator (DPWM), limit cycle oscillation is hard to predict in the voltage-mode digital controlled switching power supplies. As a result, one dedicated DPWM with very high resolution is indispensable to reduce the limit cycle oscillations, which usually results complexity and high cost for digital controllers. This paper investigates a new digital control architecture eliminating the needs for high resolution DPWM, so that greatly cost reduction can be achieved. Experimental verification is done at the hardware prototype to verify the control concept.

[1]  D. Maksimovic,et al.  Impact of digital control in power electronics , 2004, 2004 Proceedings of the 16th International Symposium on Power Semiconductor Devices and ICs.

[2]  K. Rinne,et al.  High Resolution DPWM in a DC-DC Converter Application Using Digital Sigma-Delta Techniques , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[3]  Dejan Markovic,et al.  Digital PWM control: application in voltage regulation modules , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

[4]  D. Maksimović,et al.  Modeling of Quantization Effects in Digitally Controlled DC–DC Converters , 2007 .

[5]  W.P. Marnane,et al.  An area-efficient digital pulsewidth modulation architecture suitable for FPGA implementation , 2005, Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005..

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

[7]  Gu-Yeon Wei,et al.  A fully digital, energy-efficient, adaptive power-supply regulator , 1999 .

[8]  Gene F. Franklin,et al.  Digital control of dynamic systems , 1980 .

[9]  Aleksandar Prodic,et al.  High-frequency digital PWM controller IC for DC-DC converters , 2003 .