Research And Design Of Portable Intelligent Bi-directional DC-DC Power Supply

With the rapid development of science and technologythe applications of portable electronic devices become more and more widely.Portable electronic devices generally have a set of power management and transformation system, controlled by an independent power supply chip.On the mode of control, traditional power conversion circuit usually adopt analog feedback control mode,to transform voltage or current. With the increasing improvement and maturity of digital processing technology,as the price of the related chips are lower than before,it sees the rise of digital control technology.Compared with analog feedback control mode, the digital control mode has more advantages: digital control can achieve more intelligent control strategy, at the same time,it also improves the stability, reliability and flexibility, shorten the product development cycle.As for circuit topology, compared with traditional one-directional DC- DC converter circuit, the bi-directional DC-DC converter can be more efficient,in the meantime,it also reduce elements, save space,reduce costs,so it has broad prospects.In this issue,a program-controlled bi-directional DC-DC converter circuit was designed, applying digital control and bi-directional transformation, an all-in-one circuit solutions with flexibility, portability, low cost,high efficiency.In this paper,we focus on the topology of the bi-directional DC-DC converter,PWM technology, digital control and so on.The typical topology structure is analyzed and verified by experiments.The voltage control mode and current control mode of bi-directional DC-DC converter are introduced.And several important parameters of the digital control system(such as sampling rate, A/D conversion, PWM control resolution, switching frequency) are described in detail.At last, I studied on how to ensure the detection accuracy of voltage and current and the control strategy for the system stability...