Advanced current-mode control techniques for DC-DC power electronic converters

There are many applications for dc-dc power electronic converters in industry. Considering the stringent regulation requirements, control of these converters is a challenging task. Several analog and digital approaches have already been reported in the literature. This work presents new control techniques to improve the dynamic performance of dc-dc converters.;In the first part of this thesis, a new technique applicable to digital controllers is devised. Existing digital control methods exhibit limit cycling and quantization errors. Furthermore, they are simply not fast enough for high-frequency power conversion applications. The proposed method starts the required calculations ahead of time and offers a longer time window for the DSP to calculate the duty ratio. The proposed method is more practical than its conventional counterparts. Simulation results show that the performance of the converters is improved.;Conventional analog current-mode control techniques suffer from drawbacks such as peak-to-average error and sub-harmonic oscillations. A new average current-mode control named projected cross point control (PCPC) is introduced in the second part of this thesis. This method is analog in nature; however, it enjoys dead-beat characteristics of digital controllers. Simulation and experimental results agree with each other.;The devised PCPC method needs the accurate value of the power stage inductor, which may be hard to measure in practice. The last part of this thesis introduces a self-tuned method which alleviates the dependence of the PCPC scheme on the inductor value. It is robust and does not interfere with line and load regulation mechanisms. Simulation and experimental results show the validity of the self-tuned PCPC method.