Frequency Power Supply inPipeWelding
Zhijuan Zhang · 2006
According tothecomparison ofsolid state high frequency powersupply andelectron tubehighfrequency pipe welding powersupply, itcouldbeconcluded thatsolid state highfrequency powersupply ismoreefficiency, moresecurity, longer life-span andwillreplace electron tubehighfrequency pipewelding powersupply innotverylongtimeinthis field. In thispaper,a solid state highfrequency pipewelding power supplyusingMOSFET astheinverter switch components is designed, itsoperating principle isanalyzed, thekeytechnique ofsection ofrectifier andinverter isdiscussed andtheload adaptability, frequency tracking, output powerareexplained in detail. Fromthesimulation andexperiment, itcanbeseenthat thedesigned methodisreasonable andthewholedevice ishigh efficiency. I. INTRODUCTION Thedevice ofelectron tubehighfrequency pipewelding hasdefects oflowefficiency, bigvolume, needpre-heating, short life andsoon.From1980s, withthedevelopment of semiconductor, microelectronics technique andcontrol technique, manydeveloped countries makeagreat progress insolid-state highfrequency powersupply. Atpresent, the powerswitch device ofhighfrequency powersupply is dominated byMOSFET.Thecapacity andswitching speed ofMOSFEThavebeenimproved rapidly withthemodulari- zation, high-capacity andhighvoltage ofMOSFET.The turn-off timehasbeenreduced below75nsof36A/1000V MOSFET.Thehighfrequency solid-state powersupply inverter using MOSFETshasagreat improvement incapa- city andfrequency according thefacility ofparallel connec- tion. Themainapplication field ofsolid-state highfrequen- cypowersupply isinhighfrequency pipe welding field.