The Study Of Theory And Experiment In Small Power Single-Chip Switching Power Supply

Single-chip switching power supply Integrated Circuit is the latest evolved In theworld. It has the virtues of high integration level, most cost effective lowestcomponent count switcher solution, high performance, forming high efficiency powersupply and so on. It has widely application over the world. The latest single-chipswitching power supply devices of Power Integration are investigated particularly inthe thesis. The paper includes the following four parts: Introduce the history and the develop trend of the single-chip switching powersupply, and the classify of switching power supply circuit, and its work principle. Introduce the products of single-chip switching power supply. Analyse the workprinciple of single-chip switching power supply. Especially, introduce the inside fabricand characteristic of TOPSwitch-Ⅱ and TOPSwitch-FX. Having overcome the disadvantages of ponderous, inefficient linear power source,switching power supplies are widely applied in many fields. But the rippie and lowprecision make it impossible to replace linear power source completely. Thecombination switching power supply with double outputs is designed in this paper.This power supply has not only the advantage of the general switching power supplybut also the high perfect stability in voltage. It can be applied to the power supply ofdiode laster. The design of high frequency transformer is a key technique of thesingle-chip switching power supply. The application of an apt transformer canimprove the performance of power supply and is one of the directions of precise source.According to the special demands of TOPSwitch-Ⅱ device, the devices are arranged androuted properly in the PCB board. A multi-output switching power supply controlled by the single-chip computer isalso introduced in this paper. which is an good circuit to illustrate the main techniquesof digital controlled intelligent source module. The power supply utilize themulti-function foot——M of TOPSwitch-FX device and the single-chip computerAT89C51 to realize the intelligent control of the multi-output power supply.