蔓函匦臼皿圜圈四匝二二二二二二二二二二二二二二二二二二二二二感应加热电源频率跟踪控制的研究杨宗璞I，宋书中‘，马建伟‘，朱锦洪2(1．河南科技大学电子信息丁程学院，河南洛阳471003；2．河南科技大学材料科学与工程学院，f．-lr莉洛阳471003)摘要：为减小逆变器功率器件的开关损耗，提高装置输出效率，应该控制逆变器的工作频率实时跟踪负载谐振频率，确保开关器件工作在零电压零电流开关(zvzcs)状态。介绍了在感应加热电源中采用TMS320F2812实现超音频频率躁踪的数字锁相环(DPLL)方法，给出了实现DPLL的算法。并对基于该芯片的DPLL频率跟踪控制的原理进行了分析。最后给出了相应的仿真波形和感应加热电源样机的实验波形。验证了该方法的正确性。关键词：数字信号处理器：感应加热电源；数字锁相环中图分类号：TM47文献标识码：A文章编号：1002—087X(2010)12—1296-03Researchonfrequency-trackingcontrolforinductionheatingpowersupplyYANGZong—pul，SONGShu—zhong‘，MAJian-wei‘，ZHUJin-hon92(1．SchoolofElectronicandInformationEngineering,HenanUniversityofScienceandTechnology,LuoyangHenan471003，China；2．SchoolofMaterialsScienceandEngineering,HenanUniversityofScienceandTechnology,LuoyangHenan471003，China)Abstract：lnordertoreducethelossofswitchingcomponentsandimprovetheefficlencyofthepower。theoperatingfrequencyoftheinverterpowerwascontrolled。soastotracktheIoadresonantfrequencysimultaneouslytokeeptheinverteralwaysoperatinginzerovoRagecurrentswitching(ZVZCS)mode．Amethodforimplementingthedigitalphaselockedloop(DPLL)appliedtoinduction—heatingpowersupplywasputforwardinthepaper．TheprocessofimplementingthismethodusingDSP2812waspresentedalso．ThefrequencytrackingmethodbasedonDPLLandthetheorywereanalyzed．andthecorrespondingwaveformsofsimulationandexpedmentsweregiven．Theexperimentalresultsvedfythecorrectnessofthismethod．KeyWOrds：DSP；inductionheatingpowersupply；DPLL感应加热以其独特的优点广泛应用于金属表面热处理、焊接、金属热加工等领域。在感应加热电源工作过程中因温度变化和炉料融化等因素，使负载等效参数和固有谐振频率发生变化。为保证电源正常运行。应使逆变器始终工作在功率因数接近或等于1的准谐振或谐振状态，以实现逆变器开关器...
