Kev siv hom hom choke hauv Switching Power Supply?
Hom Hom Choke, tseem hu ua hom hom choke, yog lub nplhaib sib nqus kaw, uas cov coils nrog cov lus qhia sib txawv thiab tib tus naj npawb ntawm cov lem raug mob symmetrically. Qhov zoo tshaj plaws hom choke tuaj yeem cuam tshuam cov hom kev cuam tshuam ntawm L (lossis N) thiab E, tab sis tsis muaj kev cuam tshuam inductive ntawm qhov sib txawv-hom cuam tshuam ntawm L thiab N. coj mus rau tiam ntawm kev sib txawv hom to to inductance. Thaum lub teeb liab tam sim no los yog lub hwj chim mov tam sim no ntws nyob rau hauv ob windings, cov lus qhia yog opposite, thiab cov generated magnetic fluxes thim ib leeg, yog li ntawd lub choke coil muaj ib tug tsawg impedance. Hom-hom nrov nrov tam sim no (nrog rau kev cuam tshuam tam sim no los ntawm lub voj hauv av, tseem hu ua longitudinal tam sim no) ntws los ntawm ob lub windings nyob rau hauv tib txoj kev, thiab cov generated sib nqus fluxes yog ntxiv nyob rau hauv tib txoj kev, yog li lub choke muaj siab impedance, yog li ua si. lub luag hauj lwm hauv suppressing hom suab nrov.
Hom hom choke yog qhov tseem ceeb ntawm cov lim dej bidirectional: ntawm ib sab, nws yuav tsum lim tawm cov kev cuam tshuam ntawm hom electromagnetic cuam tshuam ntawm cov teeb liab kab, ntawm qhov tod tes, nws yuav tsum txwv nws tus kheej los ntawm emitting electromagnetic cuam tshuam kom tsis txhob cuam tshuam kev ua haujlwm ntawm lwm tus. cov khoom siv hluav taws xob hauv tib qhov chaw electromagnetic.
Hom hom choke tuaj yeem xa cov cim sib txawv, DC thiab tsawg zaus sib txawv-hom teeb liab tuaj yeem dhau mus, tab sis nws nthuav tawm cov impedance zoo rau cov suab nrov ntau zaus, yog li nws tuaj yeem siv los txwv kev cuam tshuam ntau hom tam sim no. .
Kev siv hom hom choke hauv Switching Power Supply?
Hom hom choke qee zaum hu ua hom hom choke vim nws txoj haujlwm yog txhawm rau txhawm rau nws. Nws feem ntau yog siv los hloov cov khoom siv hluav taws xob los ua ntau yam lim dej los lim EMI thiab cuam tshuam cov hluav taws xob nthwv dej uas tsim los ntawm ntau yam kev kub ceev los ntawm kev tawm sab nraud. Raws li pom nyob rau hauv daim duab hauv qab no, muaj ib pawg ntawm cov kab sib txuas hauv Circuit Court, thiab cov teeb liab ib txwm tsis muaj kev cuam tshuam thaum lawv dhau los. Txawm li cas los xij, thaum hom hom tam sim no ntws, vim tib qho kev taw qhia ntawm hom hom tam sim no, nws yuav tsim ib qho chaw sib nqus hauv lub kauj thiab ua kom cov inductance ntawm lub kauj, ua rau lub kauj zoo li impedance siab.
1. Schematic daim duab ntawm lub teeb liab dhau los ntawm hom hom choke.
Schematic daim duab ntawm theem pem hauv ntej ntawm kev hloov fais fab mov, nyob rau hauv uas L1 yog hom choke. Txhawm rau txhawm rau cuam tshuam cov hom kev cuam tshuam, peb paub tias cov teeb liab hom hom yog lub teeb liab uas muaj qhov sib npaug ntawm qhov sib npaug thiab theem, thiab lub suab nrov nws tsim yog lub suab nrov hauv av, uas yog lub suab nrov ntawm ob lub xov tooj ntawm tes. Tom qab nkag siab txog cov suab nrov nrov, peb yuav paub tias vim li cas hom hom choke txuas nrog AC sab.
