Advanced digital control techniques for integrated power electronic converters

Compared with conventional power electronic converters, integrated power electronic converters appear to enjoy most of the desired features such as wide range of output voltage regulation, small size and low implementation cost. Boost integrated flyback rectifier/energy storage dc-dc (BIFRED) converter is the most popular member of its class owing to its superior dynamic performance. Due to the topological complexities of integrated power converters, control of these converters is not an easy task using the available analog control methods. Contrarily, digital controllers and digital signal processors (DSP) have been facing an enormous growth of popularity in control applications in the past few years due to their capabilities of performing complex control functions.; Two new digital control schemes of pulse regulation and digital current mode control are proposed in this thesis. They are both applicable to power electronic converters in general and integrated converters in specific. Due to their simplicity and enjoying a digital nature, the proposed methods can easily be implemented using a general-purpose DSP or a specifically designed integrated circuit (IC). In addition to the mathematical concepts, simulation and experimental results of the proposed control methods being applied to various power converters are presented in this thesis.; Pulse regulation is mainly applicable to the power converters operating in discontinuous conduction mode (DCM). In this new control method, line and load regulation are simply achieved by generating the right number of high and low power pulses. Pulse regulation does not require a detailed small or large signal model of power converters. Despite its simplicity, it offers a very fast dynamic response and it is robust against the variations of the parameters of power converters.; Digital current mode control is proposed to overcome the drawbacks of conventional analog current mode controllers. Unlike its analog counterparts, the proposed digital technique is stable for the entire range of the duty cycle. It can be utilized both in continuous conduction mode (CCM) and DCM. This control method tries to make the average value of the current passing through the inductor of the converter track a desired control signal. Since there is no need for external ramp compensation, digital current mode control enjoys a faster and more accurate dynamic response.