A smart control approach for digitally controlled multiple-output DC-DC converter

This paper presents a smart control approach for digitally controlled forward type multiple-output dc-dc converter. In this case, the central problem of design is how to decide the integral coefficient. Since the decision of integral coefficient depends on the static characteristics, the selected integral coefficient is not suitable to perform the superior dynamic characteristics. Then, it is important to set the suitable the integral coefficient for not only static characteristics but also dynamic characteristics. As a result, overshoot and the convergence time of the output voltage are improved 30% and 30%. The overshoot of reactor current is improved 11%. Moreover, to achieve the improvement of the dynamic characteristic, the number of bits of the calculation part of the digital control circuit set enlarged. As a result, the overshoot and the convergence time of the output voltage are improved 78% and 30%. The overshoot of reactor current is improved 17%.

[1]  Gun-Woo Moon,et al.  Multi-level active clamp forward converter with reduced voltage stress , 2008, 2008 IEEE Power Electronics Specialists Conference.

[2]  O. Ichinokura,et al.  Digital PI controller for high frequency switching DC/DC converters based on FPGA , 2003, The 25th International Telecommunications Energy Conference, 2003. INTELEC '03..

[3]  Hirofumi Matsuo,et al.  A comparison of steady‐state characteristics of buck‐type DC‐DC converter using DSP , 2007 .

[4]  H. Saotome,et al.  Analysis of Cross-Regulation in Multiple-Output DC/DC Converters , 2003 .

[5]  P.T. Krein,et al.  Digital Control Generations -- Digital Controls for Power Electronics through the Third Generation , 2007, 2007 7th International Conference on Power Electronics and Drive Systems.

[6]  Miro Milanovic,et al.  FPGA implementation of digital controller for DC-DC buck converter , 2005, Fifth International Workshop on System-on-Chip for Real-Time Applications (IWSOC'05).