Kev soj ntsuam ntawm electromagnetic cuam tshuam los ntawm High Frequency Switching Power Supply
Lub rectifier thiab fais fab transistor Q1 hauv Circuit Court, fais fab transistors Q2 rau Q5, high-frequency transformer T1 thiab output rectifier diodes D1 rau D2 nyob rau hauv Circuit Court ntawm daim duab 1b yog lub ntsiab qhov chaw ntawm electromagnetic cuam tshuam thaum lub high-frequency switching fais fab mov ua hauj lwm. , thiab cov ncauj lus kom ntxaws tsom xam yog raws li hauv qab no.
High-order harmonics generated nyob rau hauv rectification txheej txheem ntawm rectifier yuav ua rau conduction cuam tshuam thiab hluav taws xob cuam tshuam nyob rau hauv lub hwj chim kab.
Hloov lub hwj chim raj ua haujlwm nyob rau hauv lub xeev ntawm high-frequency rau thiab tawm. Txhawm rau txo qis kev hloov pauv thiab txhim kho lub zog ceev thiab tag nrho cov txiaj ntsig ntawm cov khoom siv hluav taws xob, lub tshuab hluav taws xob hloov hluav taws xob tau qhib thiab tawm sai dua thiab nrawm dua, feem ntau hauv ob peb microseconds, thiab lub hwj chim hloov lub raj yog qhib thiab tawm ntawm Qhov kev ceev no, ua rau muaj hluav taws xob hluav taws xob thiab hluav taws xob tam sim no, uas yuav ua rau lub siab sib haum xeeb ntawm cov khoom siv hluav taws xob thiab cov hluav taws xob siab thiab hluav taws xob cuam tshuam rau qhov chaw thiab AC input kab.
Thaum lub high-frequency transformer T1 ua lub zog hloov dua siab tshiab, nws generates alternating electromagnetic teb, uas radiate electromagnetic vuag mus rau hauv qhov chaw, ua rau hluav taws xob cuam tshuam. Qhov faib inductance thiab capacitance ntawm lub transformer tsim oscillation, uas yog txuas mus rau AC input voj los ntawm kev faib capacitance ntawm thawj theem ntawm lub transformer, tsim kev cuam tshuam kev cuam tshuam.
Thaum cov zis hluav taws xob qis qis, cov zis hluav taws xob rectifier diode ua haujlwm nyob rau hauv lub xeev hloov pauv siab, uas kuj yog ib hom kev cuam tshuam electromagnetic.
Vim yog cov kab mob parasitic inductance ntawm cov hlau lead, lub hlws ris capacitance thiab kev cuam tshuam ntawm qhov rov qab rov qab tam sim no, lub diode ua haujlwm ntawm qhov hluav taws xob siab thiab qhov hloov pauv tam sim no. Lub sijhawm rov qab los ntawm lub diode ntev dua, qhov loj dua qhov cuam tshuam ntawm qhov tam sim no thiab qhov muaj zog ntawm cov teeb liab cuam tshuam, uas ua rau muaj kev cuam tshuam ntau zaus attenuation oscillation, uas yog ib hom kev sib txawv ntawm kev cuam tshuam.
Tag nrho cov no generated electromagnetic signals yog xa mus rau sab nraud fais fab mov los ntawm hlau hlau xws li fais fab, kab teeb liab thiab hauv av nyob ntawm tej los tsim kev cuam tshuam kev cuam tshuam. Cov teeb liab cuam tshuam cuam tshuam los ntawm cov xov hlau thiab cov khoom siv lossis los ntawm cov kab sib txuas ua haujlwm ua tus kav hlau txais xov ua rau muaj hluav taws xob cuam tshuam.
