Analysis And Design Of 2.5KW Self-Cooled High-Frequency Switching Power Supply

The analysis and design of 2.5KW self-cooled high-frequency power supply is presented in this thesis. This thesis firstly discusses some research focus of high-frequency power supply and variable circuit topologies are compared here. Then it emphasizes the operating principle of phase shift full bridge converter and realization of soft switching techniques. Soft switching can improve the converter's efficiency and reduce EMI. In comparison of some methods of approaching soft switching, this thesis presents a Diode Auxiliary Resonant Commutating Network which is composed by an auxiliary bridge and a resonant commutating inductor. This topology not only well realizes zero voltage switching (ZVS), but also overcomes the parasitic oscillation in the secondary side Diodes. Simultaneously, this topology makes both the secondary side diodes and auxiliary diodes operate on the soft switching state too, which reduces more switching losses and provides requirement for the system to run stably under the condition of self-cooled.Modeling and designing method of switching power supply based on small-signal modeling is applied in the control system, which optimizes the regulator parameter in this control system. A sample power supply is developed and debugged, based on parameter simulation in the environment of Orcad PSpice9.2. Analysis of experimental waveforms and data validate the practicability of this topology. The design of main hardware circuits of power supply and development of software of surveillance and control system are introduced at last.