Tsib Txoj Kev Tiv Thaiv ntawm Cov Khoom Siv Tiv Thaiv Surge
Cov Txheej Txheem rau Kev Tiv Thaiv Surge
1. Cov Khoom Siv Tiv Thaiv Hluav Taws Xob Sib Npaug (SPDs) Txuas Nrog Cov Kab Fais Fab
Nyob rau hauv cov xwm txheej ib txwm muaj, cov varistors sab hauv lub surge protector tseem nyob hauv lub xeev siab-impedance. Thaum lub zog fais fab raug xob laim ntaus lossis ntsib kev nce siab ib ntus vim yog kev ua haujlwm hloov pauv, lub protector teb hauv nanoseconds, ua rau cov varistors hloov mus rau lub xeev qis-impedance, sai sai clamping lub overvoltage mus rau qib nyab xeeb. Yog tias lub sijhawm ntev surges lossis overvoltages tshwm sim, lub varistor degrades thiab kub, ua rau lub tshuab thermal disconnect los tiv thaiv hluav taws thiab tiv thaiv cov khoom siv.
2. Cov Khoom Tiv Thaiv Hluav Taws Xob Hom Series Filter Txuas Nrog Cov Hluav Taws Xob Circuits
Cov tiv thaiv no muab lub zog huv thiab muaj kev nyab xeeb rau cov khoom siv hluav taws xob rhiab heev. Cov xob laim tsis yog nqa lub zog loj heev xwb tab sis kuj tseem muaj qhov hluav taws xob thiab qhov nce tam sim no siab heev. Txawm hais tias parallel SPDs tuaj yeem tswj cov surge amplitudes, lawv tsis tuaj yeem ua kom lawv cov wavefronts ntse. Series lim-hom SPDs, txuas nrog hauv kab nrog cov hluav taws xob circuits, siv MOVs (MOV1, MOV2) los clamp overvoltages hauv nanoseconds. Tsis tas li ntawd, lub lim LC txo qhov ntxhab ntawm qhov hluav taws xob thiab qhov nce tam sim no ntawm ze li ntawm 1,000 zaug thiab txiav cov hluav taws xob seem los ntawm tsib npaug, tiv thaiv cov khoom siv rhiab heev.
3. Txhim Kho Cov Varistors Voltage-Clamping Nruab Nrab Cov Theem Thiab Cov Kab Kom Txwv Tsis Pub Muaj Surge Overvoltages
Txoj kev no ua haujlwm zoo rau teeb pom kev zoo, lub tshuab nqa neeg, cua txias, thiab cov cav, uas muaj peev xwm tiv taus hluav taws xob ntau dua. Txawm li cas los xij, nws tsis zoo rau cov khoom siv hluav taws xob niaj hnub nrog kev sib koom ua ke siab. Piv txwv li, hauv cov kab ke ib theem 220V AC, cov varistors feem ntau raug ntsia nruab nrab ntawm qhov nruab nrab thiab hauv av kom nqus cov teeb liab xob laim. Kev tiv thaiv zoo nyob ntawm kev xaiv varistor thiab kev ntseeg siab.
Qhov clamping voltage yog teem raws li lub grid lub siab tshaj plaws voltage (310V), suav rau:
- 20% kev hloov pauv ntawm lub grid,
- 10% kev kam rau cov khoom sib xyaw,
- 15% cov yam ntxwv ntawm kev ntseeg tau (kev laus, noo noo, cua sov).
Yog li, cov theem clamping feem ntau yog txij li 470V txog 510V. Cov dej ntws qis dua 470V hla dhau tsis cuam tshuam.
Txawm hais tias cov khoom siv hluav taws xob txheem (piv txwv li, cov cav, teeb pom kev zoo) tuaj yeem tiv taus 1,500V AC (2,500V qhov siab tshaj plaws), cov khoom siv hluav taws xob niaj hnub ua haujlwm ntawm ± 5V txog ± 15V, nrog rau qhov siab tshaj plaws hauv qab 50V. Cov zaus siab dua 470V tseem tuaj yeem txuas nrog cov capacitance parasitic hauv transformers thiab cov khoom siv fais fab, ua rau ICs puas tsuaj. Ntxiv mus, vim yog varistor residual voltage thiab lead inductance, cov surges muaj zog tuaj yeem thawb cov theem clamping mus rau 800V–1,000V, ntxiv rau kev phom sij rau cov khoom siv hluav taws xob.
4. Txhim Kho Kev Tiv Thaiv Nrog Ultra-Isolation Transformers (Txoj Kev Rho Tawm)
Ib lub transformer cais uas muaj daim ntaub thaiv tau muab tso rau nruab nrab ntawm lub zog fais fab thiab lub nra hnyav kom thaiv cov suab nrov ntau zaus thaum ua kom muaj kev sib txuas hauv av. Kev cuam tshuam hom sib xws, uas yog piv rau hauv av, sib txuas los ntawm kev sib txuas ntawm cov winding capacitance. Ib daim ntaub thaiv av ntawm cov winding thawj thiab thib ob yuav tshem tawm qhov kev cuam tshuam no, txo cov suab nrov tso tawm.
5. Txoj Kev Nqus Dej
Cov khoom siv nqus dej tswj cov surges los ntawm kev hloov ntawm qhov siab mus rau qhov qis impedance thaum cov voltages threshold raug tshaj. Cov khoom siv feem ntau suav nrog:
- Cov Varistors - Muaj peev xwm tswj tau tam sim no tsawg.
- Cov Hlab Pa Tawm (GDTs)- Teb qeeb.
- TVS Diodes / Cov Hlab Hluav Taws Xob Tawm Khoom - Sai dua tab sis muaj kev pauv pauv hauv kev nqus hluav taws xob.
