Okukhona i-frequency yokutshintsha ye-transformer iphezulu, kokukhona i-volume yayo incinci. Ngoko ke, ngaba oko kuthetha ukuba akukho mda uphezulu kwi-frequency yokutshintsha? Ngoko ke, ngaba i-volume ingaba ncinci kakhulu?
Impendulo ithi ayikho. Kwinkqubo yokusebenza, ubuninzi bee-transformers ezisebenzisa i-high-frequency bumiselwa zizinto ezininzi kwaye bunokwahlulwahlulwa lube ziinkalo ezahlukeneyo:
1, I-topology yesekethe ye-flyback topology: Iitransformers zinemisebenzi yokugcina amandla kunye nokuguqula, kunye ne-frequency yokusebenza esetyenziswa rhoqo ye-40-100kHz. Xa i-frequency ingaphantsi kwe-40kHz, umthamo we-iron core mkhulu kakhulu, nto leyo ebangela umthamo omkhulu wombane; Xa i-frequency idlula i-100kHz, ii-voltage spikes ezibangelwa yi-leaking inductance zingonakalisa i-transistor etshintshayo.
I-Forward topology: Uluhlu oluqhelekileyo yi-60-150kHz, kodwa lufuna ukulinganisela ilahleko ze-magnetic core kunye nelahleko zeswitshi. I-Push pull/half bridge/full bridge topology: I-Symmetrical switch driven bidirectional magnetized magnetic core, ukusebenza kakuhle okuphezulu, ixhasa amaza aphezulu ukusuka kumakhulu e-kHz ukuya kwi-MHz, kodwa ifuna uyilo lolawulo oluntsonkothileyo kunye nokusasazwa kobushushu.
2. Iimpawu zezinto ezingundoqo zemagnethi ziquka ukulahleka kwe-magnetic hysteresis kunye nokulahleka komsinga we-eddy. Ngaphakathi koluhlu oluthile, ukulahleka kwe-magnetic core kuyanda ngokunyuka kwe-frequency. Ke ngoko, izixhobo ezahlukeneyo ze-magnetic core kufuneka zibe noluhlu lokusetyenziswa kwe-frequency ezahlukeneyo ukuqinisekisa ukulahleka kwe-magnetic core okuphantsi. Umzekelo, i-manganese zinc ferrite ifanelekile ukusetyenziswa kwi-frequency ukusuka kwi-10 ukuya kwi-300kHz, ngelixa i-nickel zinc ferrite ifanelekile ukusetyenziswa kwi-frequency engaphezulu kwe-1MHz.
Okwesibini, njengoko i-frequency isanda, i-magnetic induction intensity ephezulu kufuneka incitshiswe ukuze kuthintelwe ukugcwala kwe-magnetic core. Umzekelo, i-magnetic induction intensity ye-DMR40 yi-0.38T, kwaye xa siyila kwi-frequency ye-100KHz, sihlala sithatha ixabiso elimalunga ne-0.2T.
3. Isantya sokutshintsha isixhobo samandla I-MOS transistor yeyezixhobo ze-unipolar, enexesha lokucima kwi-nanoseconds. I-frequency yokusebenza enombono inokufikelela kwi-MHz, kwaye i-frequency yokusebenza ephezulu ngamakhulu aliqela e-KHz. I-IGBT yeyezixhobo ze-bipolar, enexesha elide lokucima kunye ne-frequency yokusebenza ephezulu idla ngokuba phakathi kwe-40~50KHz.
4, Ukwanda kokusebenza kakuhle kunye nokuphindaphinda kokusasazwa kobushushu kukhokelela ekwandeni kokulahleka kweswitshi kunye nedrive, okubangela ukwehla kokusebenza kakuhle kunye nokwanda kokuveliswa kobushushu. Ukuze kuqinisekiswe ukuba ubushushu bemveliso bukwinqanaba eliqhelekileyo, sidinga amanyathelo angakumbi okujongana nokusasazwa kobushushu.
5. Kwi-frequency ephezulu, iindleko ziyanda ngenxa yokulahlekelwa yi-switch okwandileyo, okufuna amanyathelo angakumbi okusingatha ukusasazwa kobushushu, okukhokelela ekwandeni kweendleko. Okwesibini, ii-capacitors kunye nee-inductors zihlala zifumana ukuwohloka kokusebenza kwi-frequency ephezulu, kwaye kufuneka sikhethe izixhobo ezifanelekileyo kwi-frequency ephezulu, nto leyo enyusa iindleko. Kuyilo olusebenzayo, iindleko zilinganiselwe, nto leyo edla ngokumisela umda ophezulu we-frequency yokusebenza.
6, Iimpawu zeChip: Iitships zolawulo lwePWM zihlala zineemfuno zomda ophezulu ukuze ziphendule kuhlengahlengiso lomthwalo oguqukayo. Oku kukwamisela ukuba i-frequency yokutshintsha ye-transformer ingaphakathi koluhlu oluthile.
Ixesha lokuthumela: Agasti-06-2025
