Based On Dsp-v ~ 2 Controlled Buck Converter Research

Power supply plays an important part in various electronic systems. With the increasingly complexity of power system, and the gradually expanding scales, the requirements for high-performance power supply systems is urgent. In the microprocessor system, the voltage tolerance is reduced from±250mV (five years ago) to±25mV recently. In future, the current of power supply will raise from 60 A to 130 A, while the voltage will decrease to 1.1 V. The much greater challenge is how to realize the±25mV regulator voltages under the condition of 800 A / us. Hence we need to look for a faster and more stable power control method.Taking DC / DC Buck Converter as the example, based on the summing up of a variety different control methods, this paper analyzes the V 2(v-sup-2) control method, and compares this method with the voltage-mode control and current-mode control and summaries the small-signal model of these three control methods, then gets the general small-signal model.Through comparisons of output impedance, the transfer function between output and input voltage, and the transfer function between output voltage VO and the output voltage Ve of comparator, we get the frequency-domain simulation, and conclude that within the V 2control method, the output impedance of Buck Converter is the minimum, the response rate to input voltage and load changes is the fastest, and the output voltage ripple is the minimum. The time-domain simulation in PSPICE verifies the correctness of small-signal model.Digital Switching Mode Power Supply has the characteristics of easy management, small size, high stability, strong interference capability, and flexible control. This paper firstly introduces DSP into DC / DC converter with V 2control. Based on the structure and principle of TI C2000 series chip, combined the TMS320LF2407 Event Management, ADC modules and other modules in digital power supply, under the principle of V 2 control, and through the real-time calculation of DSP, generates PWM signal to control the on-or-off of power switch.The software design of the V 2control Buck Converter System based on DSP utilizes the concept of structured and modular design. In accordance with the design requirements, demonstrates the procedures of initialization, A / D sampling, PWM signal generating and PI control modules, and shows the program flow respectively. At the same time, this paper completes the hardware design of V 2control Buck Converter System based on DSP.