Yuav ua li cas dises hnov ​​nrawm nrawm hauv load hloov modules?

一, lub cev ntawm lub cev ntawm cov lus teb ceev ntawm diodes
1. Unidirectional conduction thiab hloov cov yam ntxwv
Cov yam ntxwv tseem ceeb ntawm Diode dag hauv Unidirectional conductivity ntawm PN hlws rau cov Cathode voltage, thaum lub PN hlws thaiv cov kev coj ua los ua txoj hauv kev tam sim no; Nyob rau hauv qab rov qab voltage, lub pn kev sib tshuam txiav tawm thiab thaiv tam sim no. Cov xeeb ceem no ua rau nws lub ntuj "hloov hluav taws xob" uas tuaj yeem tsim kom sai sai lossis txiav cov kev tam sim no thaum lub sijhawm thauj khoom. Piv txwv li, hauv ib qho -}} Base Choj Rectifier Circuities, nrog lub sijhawm hloov pauv hloov zuj zus thiab lub sijhawm teb ntawm microconds.

2. Kev txhim kho ntawm lub sijhawm rov qab rov qab (TRR)
Thaum cov diode hloov mus los ntawm lub xeev ua rau lub xeev txiav, nws yuav tsum tso cov neeg muaj hnub sib tshuam hauv PN me me, uas yog hu ua rov qab rov qab. Lub TRR ntawm cov tsoos Rectifier diodes tuaj yeem ncav ntau pua ntawm nanoseconds, thaum ultras rov qab dodees (} Piv txwv li, qhov TRR ntawm UF4007 ultraFast Rov qab Diode tsuas yog 35 nanoseconds, ua kom nws mus ua tiav kev ncua pub dawb nyob rau hauv high- zaus PWM TSAV TSHEB.

3. Feem ntau cov tsiaj kuj tseem ua rau schottky diodes
Schottky diodes siv hlau sielductor junctions (ms junctions (msab Nws hloov nrawm tuaj yeem ncav cuag picosecond qib (10 ^ {{12 vib nas this} 12 vib nas this), thiab nws tuaj yeem tshem tawm rov qab los ntawm kev rov qab los ntawm kev hloov kho lub zog loj. Piv txwv li, hauv 48v DC npav, schottky diodes tau txo lub ntsuas hluav taws xob thaum lub sijhawm 50v ntawm cov tsoos diodes rau hauv 5V.

2, Tseem Ceeb Daim Ntawv Qhia Txog Cov Xwm txheej hauv Load Hloov
1. Kev tiv thaiv tam sim no rau inductive thauj khoom
Nyob rau hauv inductive thauj cov xwm txheej thiab relay tswj lub zog yog muab tua tau los ntawm lub raj hluav taws xob thaum lub zog hluav taws xob, muaj kev phom sij rau kev nyab xeeb ntawm kev tsav tsheb. Txij ntawm no, lub parallel freewheeling dodees xav tau kev coj ua nyob rau hauv nanoseconds los muab txoj kev tso tawm rau lub zog inductive. Piv txwv li, hauv 24V DC lub cev muaj zog tswj, kev siv fr107 ceev rov qab los ntawm kev sib nqus lub zog tshwm sim los ntawm kev sib nqus lub zog los ntawm kev sib nqus lub zog los ntawm 1n4007 diod (trr =300 ns).

2. Kev hloov pauv ntawm ntau lub nra
Hauv Plc tswj cov tshuab los yog cov khoom siv hluav taws xob, ntau lub nra yuav tsum tau hloov ntawm nws tus kheej thiab zam kev cuam tshuam ntawm kev cuam tshuam thiab zam kev sib cuam tshuam. Txij ntawm no, txhua lub zog yuav tsum tau nruab nrog kev ywj pheej uas tsis pub muaj Diode thiab tshem tawm cov kev cuam tshuam hauv av los ntawm lub hnub qub tsim qauv. Piv txwv li, qee lub tsheb lub tsheb tswj kev siv 12 channel ywj siab freeded fais fab sib xyaw ua ke hauv qhov kub thiab txias ntawm -40 Qib mus rau 125 degree.

3. Kev siv hluav taws xob zoo nkauj rau kev hloov pauv fais fab tuag
Nyob rau hauv hloov hom fais fab khoom, cov txheej txheem thev naus laus zis hloov pauv ntawm Mosfets nrog cov khoom siv voltage tsis tshua muaj zog, tab sis yuav tsum muaj diiiles raws li cov khoom siv ywj pheej. Txij ntawm no, lub ultrafast rov qab yuav tsum tau ua tiav txuas ntxiv mus txuas ntxiv thaum lub sijhawm Mosfet muab tua (feem ntau<10ns) to avoid output voltage drop. For example, in a 48V/12V DC-DC converter, C3D10065F silicon carbide Schottky diode (VF) is used= 0.65V@10A )The conversion efficiency can be increased from 92% to 96%.

3, kev lag luam daws teeb meem thiab thev naus laus zis
1. Ntaus Ntaus Xaiv thiab Parameter Matching
Cov xwm txheej loj: Ufrd lossis schottky donges nyiam dua. Piv txwv li, hauv 20kHz lub cev muaj zog tsav, TRR (35Ns) ntawm UF4007 hom UFRD yog txo los ntawm 88% piv rau 1N4007 (300ns), uas tuaj yeem txo kev hloov pauv ntawm 40%.
Siab xwm txheej tam sim no: Siv Cov Khoom Siv Hluav Taws Xob Piv txwv li, cov cua sov dissipation efficiency ntawm SM4007 SMD Diode (4-1000V) yog ob zaug ntawm kev ua yeeb yam ntawm Relay Arst.
Siab Voltage Scenario: Xaiv cov kev ntsuas siab siab silicon pawg lossis silicon carbide diode. Piv txwv li, 2dlg siab - voltage silicon pawg (1200V / 10A) yog txo los ntawm 50% piv rau Silicon Diodes.
2. Lemout optimization thiab parasitic parameter tswj
Shorten lub voj: Muab cov nyiaj pub dawb tso tseg kom ze rau cov thauj khoom kawg li sai tau kom txo cov kev ua haujlwm tsis sib xws. Piv txwv li, hauv lub cev muaj zog tsav PCB, tswj qhov kev ncua deb ntawm Diode thiab lub cev muaj zog PIN tsis pub dhau 3 hli tuaj yeem txo voltage overshoot los ntawm 50v.
Kev ywj pheej Grounding: Txais yuav lub hnub qub zoo nkauj tsim qauv kom tsis txhob muaj kev cuam tshuam txuas los ntawm cov xov hlau hauv av. Piv txwv li, hauv cov relay relay tswj hwm, teeb tsa kev ywj pheej hauv av rau txhua qhov channel tuaj yeem txo qhov tsis muaj tseeb los ntawm 5% rau 0.1%.
Lub Network Buffer: parallel Rc Pauv Circuit Txwv lossis TVs raj ntawm cov ntshav tseem ceeb. Piv txwv li, los ntawm kev sib tw ib qho 10 ω / 0.1 μ F Rc kev nqus nruab nrab ntawm Mosfet thiab Inductive Thauj, tig tawm cov hluavtaws loj tuaj yeem tsim txom los ntawm 100V.
3. Tawm thev naus laus zis thiab cov ntaub ntawv thov
Silicon Carbide (Sic) Diode: Lub Siab Av Hluav Taws Xob (2.8mv / cm) thiab muaj txiaj ntsig siab ntawm SCTA {} Tsis muaj voltuction voltage poob (vf)< 0.7V@10A )And extremely short TRR (<10ns). For example, C3D series SiC diodes can improve efficiency by 1.5% and reduce heat sink volume by 30% in photovoltaic inverters.
Gallium nitride (GAN) Kev sib xyaw ua ke: Cov kev sib xyaw ua ke: Kev sib xyaw ua ke}}}} xem ntawm gan Piv txwv li, GAN fais fab kev koom ua ke los ntawm EPC lub tuam txhab tuaj yeem txo lub ntim rau 1/5 ntawm cov kev daws teeb meem hauv 48V / 12V hloov dua siab tshiab.
4, Kev Kawm Kev Kawm: Kev ua kom zoo ntawm kev xyaum tsav tsheb tsav
Ib qho kev muaj kev tsim hluav taws xob servo tsav kev sib tw voltage spikes ntau tshaj tus qauv thaum siab- ceev braking, ua rau muaj kev puas tsuaj ntau rau kev tsav tsheb igbt. Tus thawj tsim no siv 1N4007 Diode raws li lub caij nyoog dawb, tab sis nws TRR (300ns) tsis tuaj yeem nqus lub cev muaj zog hauv lub sijhawm. Daws cov teeb meem los ntawm kev ntsuas kev ua hauv qab no:

Ntaus ntawv hloov kho tshiab: hloov nrog UF4007 hom ultrafast rov qab diode (trr =35 ns), txo qhov rov qab voltage spike los ntawm 200v mus rau 60v.
Kev txhim kho kev txhim kho: Tsiv cov Diode dawb huv, luv luv cov xaim hluav taws xob ntev los ntawm 50 hli, thiab txo cov cab tsis tsim nyog los ntawm 50NH.
Buffer Network: Txuas ib qho 10 ω / 0.1 μ f Rc kev ua haujlwm nyob rau hauv kev sib cav sib ceg thiab lub chaw tsav tsheb hluav taws xob voltage overshoot rau 40v.
Tom qab kev ua haujlwm zoo, lub kaw lus ua tiav kev ua haujlwm ruaj khov ntawm qhov chaw hloov ntawm 10 zaug hauv ib hlis twg rau kev ua tiav ntawm 2.3%.