Frequency Multi-phase Digital Dc-dc Control Design And Implementation Of The Chip Functional Blocks

The digital power management has always played an important role in the field of low-voltage high-current applications. Recently, with the overall function of the low-voltage high-current power supply system continues increasing, the needs which more and more complex power management be used in low-voltage high-current applications has attracted great attention by both industry and academia. In this paper, certain research is given about the existing protection modules according to the advatanges of digital power management in which more factors existed, faster real-time response speed needed and multiple, complex, high-performance system applications should be managed. Based on relavent research, we propose a new modular architecture and design scheme.Firstly, systematic introduction to the current new challenges in the field of power management and the strengths of digital power management in low voltage high current applications is applied. We give the corresponding design specifications and the power stage component selection after briefly introduced the basic concepts of the low-voltage high-current buck, because of the protection modules which designed in this paper are based on the existing four-phase high-frequency synchronous buck.To design the protection modules, a more compact configuration mode is proposed compared with the circumstance that the configuration mode used in relvant products is mostly too complex to handle. This solution aims to better actual results at the same time not reducing the reliability of the system. After that, we design the specific circuit as soft start module, pre-biased voltage protection module, voltage tracking module and voltage margin module. Modeling and simulation is then applied in the paper.To improve the existing controller, linear-nonlinear control method is introduced to improve the transient response and overshoot according to the non-current sampled AVP. The problem when I2C bus transform low voltage has a offset voltage is also modified by changing the controller.Then, relevant verification of the protection modules is tested under the CPLD platform. Result shows that the protection modules designed in this paper can achieve desired design goals we expected through this configuration mode. In addition, linear-nonlinear circuit improves the original transient response and the modification of the I2C bus controller effectively solve the problem that SDA line exists low offset voltage when transmission.At last, summary and further work is given, according to the design process and experience.