| Recently, the power supply has been receiving increasing attention in the telecommunicationsand communications systems because the power supply system requires the high performancecharacteristics, the high energy management function, the high reliability and the small size In thecomputer and modern electronic equipment, power supply voltage is usually require multiple levelsof the power supply equipment, If the power supply voltage on each level are using a converter isindependent, it will inevitably lead to increase the size and cost of power supply equipment, Thedevelopment of portable electronic products put forward higher request to the power supplyequipment, multi output switching power supply as a portable power supply electric equipment, hasbeen widespread concern and research.This article has conducted the research, comparison the system based on multi outputswitching power supply system of the basic structure, working principle and application range,facing with the defect of general DC/DC converter, which requires additional magnetic reset circuitCausing power equipment of large volume, the output voltage usually change if the load currentchange and the circuit efficiency is generally low, and ect. This article Combining the advantages offorward and flyback converter, Design a topology forward-flyback topology, Analysis its workingmode, using this topology as one of output to the three outputs DC/DC converter It enhance thecircuit efficiency and have reduce the equipment volume.Compared and analyzed of existing control methods of multiple output DC/DC converter,facing with the defect of general control methods can not accurately control the output voltage, andthe circuit cross regulation are high, this article using the pulse width modulation pulse delaytechnique to control the forward-flyback topology three outputs DC/DC converter. using smallsignal model to analysis the equivalent circuit, through calculation and verified by simulationmethod. calculation and simulation results obtained are consistent. Using circuit structure andcontrol method designed in this article, have effectively improved the efficiency of multiple outputDC to DC converter and improved the cross regulation. |
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