Yuav ua li cas txo cov cua sov poob ntawm diodes hauv lub zog hluav taws xob los ntawm kev tsim tshiab?

Ib, Cov Khoom Siv Tshiab: Los ntawm silicon-raws li qhov dav bandgap, tawg los ntawm kev txwv lub cev
Cov tsoos silicon-raws li diodes raug txwv los ntawm cov khoom siv thiab ua rau muaj kev poob qis hauv kev kub siab - kub thiab siab - zaus zaus. Kev siv cov diodes rov qab sai (FRDs) ua piv txwv, lawv lub sijhawm rov qab rov qab (trr) feem ntau yog nyob rau hauv thaj tsam ntawm kaum ntawm nanoseconds mus rau microseconds, thiab tus nqi rov qab rov qab (Qrr) yog qhov siab, uas ua rau muaj kev loj hlob ntawm kev hloov pauv nrog ntau zaus. Cov ntaub ntawv dav dav bandgap semiconductor, xws li silicon carbide (SiC) thiab gallium nitride (GaN), muab txoj hauv kev tshiab rau kev txo cov cua sov vim lawv cov hluav taws xob muaj zog thiab siab tawg ua haujlwm.

1. SiC Schottky diode: "zoo tagnrho hloov" rau xoom thim rov qab
SiC Schottky diodes txais yuav cov hlau semiconductor hlws ris qauv, uas yuav luag tsis muaj nqi khaws cia, thiab lub sij hawm rov qab los nyob ze rau xoom. Qhov rov qab rov qab poob tuaj yeem raug txo los ntawm ntau dua 90%. Hauv kev them nyiaj ntawm lub zog tshiab tsheb, nws qhov siab - cov yam ntxwv zaus (ua haujlwm zaus mus txog qib MHz) txo qhov feem ntawm kev hloov pauv los ntawm 15% ntawm silicon-raws li qis dua 3%. Piv txwv li, Zhixin Microelectronics 'SiC SBD npog cov xwm txheej me thiab nruab nrab ntawm lub zog hauv 48V lub zog cia nrog ntau yam tam sim no ntawm 2A-100A, thiab qhov sib txuas ntawm qhov kub thiab txias tau txuas ntxiv mus rau -55℃txog 175 degree, txhim kho cov txheej txheem thermal margin.

2. GaN HEMT integrated diode: ib lub raj ua tiav bidirectional conduction
GaN siab electron txav transistors (HEMTs) tuaj yeem sib xyaw ua haujlwm ntawm diode hauv ib lub nti los ntawm kev ua kom zoo ntawm cov cuab yeej siv, tshem tawm cov kev cuam tshuam ntxiv los ntawm kev sib txuas ntawm diodes thiab hloov cov transistors hauv cov kev daws teeb meem ib txwm muaj. Siv GaN cov khoom siv los ntawm EPC cov tuam txhab ua piv txwv, lawv qhov rov qab qhov hluav taws xob poob qis (VSD) qis li 0.1V, uas yog 85% qis dua li 0.7V ntawm silicon-raws li MOSFET diodes, thiab tuaj yeem txo qhov kev poob qis ntawm 30% hauv photovoltaic inverters.

2, Topology optimization: los ntawm passive rectification rau active tswj, reconstructing zog txoj kev
Cov tsoos diode rectifier Circuit Court cia siab rau lub unidirectional conductivity ntawm lub cuab yeej, tab sis lub taag voltage poob (VF) ua rau lub zog dissipate nyob rau hauv daim ntawv ntawm tshav kub. Los ntawm innovating Circuit Court topology, "zero voltage drop" rectification tuaj yeem ua tiav, tshem tawm cov cua sov los ntawm cov hauv paus hniav.

1. Zoo tagnrho diode maub los: MOSFET simulates unidirectional conduction
Qhov zoo tshaj plaws diode maub los hloov ib txwm diodes los ntawm kev tsav tsheb MOSFETs, siv qhov tsis tshua muaj siab ntawm kev ua haujlwm (RDS (on)) ntawm MOSFETs kom ua tiav yuav luag tsis muaj txoj hauv kev. Piv txwv li, Analog Devices 'LTC4412 maub los tsav N-channel MOSFET nrog qhov hluav taws xob poob ntawm tsuas yog 10mV ntawm 1A tam sim no, uas yog 97% qis dua 0.4V ntawm Schottky diodes. Nyob rau hauv lub redundant fais fab mov system ntawm industrial PLC, ob lub hwj huam mov yuav tau hloov los ntawm LTC4412, nce efficiency mus rau 99.5% thiab txo qhov thermal tsim complexity.

2. Peb theem active rectifier choj: tshem tawm diode voltage poob
Cov tsoos peb-theem rectifier choj siv 6 diodes, txhua qhov ua kom muaj qhov hluav taws xob poob ntawm 0.7V, ua rau lub zog poob ntau dua 10%. DC2465 kev soj ntsuam xyuas pawg thawj coj los ntawm Linear Technology Corporation (tam sim no ADI) siv peb LT4320 zoo tagnrho diode choj controllers tsav rau 6 qhov poob qis MOSFETs, nce efficiency ntawm 84% mus rau 97% ntawm 9V input. Nws tuaj yeem ua haujlwm ruaj khov yam tsis muaj cua txias hauv qab 25A load. Qhov kev daws teeb meem no tuaj yeem ua kom yooj yim thermal tsim thiab txo cov nqi hluav taws xob hauv cov xwm txheej xws li cua fais fab converters thiab cov ntaub ntawv chaw UPS.

3, Kev txawj ntse tswj: los ntawm kev tiv thaiv zoo li qub rau kev hloov pauv hloov pauv, ua tiav kev tswj xyuas thermal
Lub tshav kub poob ntawm diodes muaj kev cuam tshuam nrog kev ua haujlwm xws li tam sim no, qhov hluav taws xob, thiab zaus, thiab cov tswv yim tiv thaiv zoo li qub (xws li kev txwv tam sim no) yog qhov nyuaj rau kev hloov mus rau kev ua haujlwm dynamic. Kev saib xyuas lub sijhawm tiag tiag ntawm cov khoom siv raws li txoj cai los ntawm kev txawj ntse tswj algorithms tuaj yeem ua tiav kev tiv thaiv kev kub ntxhov.

1. Kev ntsuas kub ntsuas tus qauv: kwv yees kev tiv thaiv thermal
Los ntawm kev sib txuas cov qauv tam sim no nrog cov ntaub ntawv ntsuas kub, lub diode hlws ris ntsuas kub ntsuas tus qauv tuaj yeem tsim ua kom muaj kev ceeb toom ntxov ntawm kev pheej hmoo ntawm thermal runaway. Piv txwv li, nyob rau hauv lub zog cia converter tswj los ntawm STM32, qhov sib txuas kub (Tj) yog xam nyob rau hauv lub sij hawm los ntawm sampling lub diode tam sim no (Yog hais tias) thiab lub tshav kub dab dej kub (Ths), ua ke nrog cov cuab yeej thermal tsis kam (R θ jc, R θ cs)
Thaum Tj tshaj qhov kev nyab xeeb (xws li 140 degree), lub kaw lus cia li txo nws cov kev ua haujlwm ntsuas kom tsis txhob muaj kev puas tsuaj. Tom qab siv cov tswv yim no, lub diode tsis ua hauj lwm tus nqi ntawm 15kW photovoltaic inverter txo los ntawm 80%.

2. Dynamic buffer Circuit Court: Tshem tawm cov rov qab rov qab spikes
Rov qab rov qab tam sim no spike (IRR) yog qhov tseem ceeb ua rau hloov pauv thiab EMI. Los ntawm kev sib txuas txuas RC tsis sib txuas ntawm ob qhov kawg ntawm lub diode lossis siv cov cuab yeej hloov pauv, lub sijhawm ncov thiab tus Tsov tus tw ntawm IRR tuaj yeem txo qis. Piv txwv li, nyob rau hauv daim ntawv thov ntawm Xinghai RS series ceev rov qab diodes, los ntawm optimizing lub buffer capacitor tsis, trr yog shortened los ntawm 50ns mus rau 20ns, Qrr yog txo los ntawm 40%, thiab efficiency yog txhim kho los ntawm 3% -5% nyob rau hauv high-frequency rectification scenarios.

4, Cov ntaub ntawv Engineering: Xyaum ua kom zoo tshaj qhov kub poob hauv photovoltaic inverters
Ib lub 100kW photovoltaic inverter Ameslikas siv silicon-raws li ceev rov qab diodes, uas nquag ntsib diode explosion teeb meem nyob rau hauv siab -kub ib puag ncig. Tom qab kev soj ntsuam, lub hauv paus yog vim li cas:

Cov khoom siv txwv: Lub trr ntawm silicon-raws li diodes ncav cuag 100ns, thiab Qrr yog qhov siab, uas ua rau qhov hloov pauv poob mus txog 25%;
Kev siv hluav taws xob tsis txaus: Siv cov roj silicone zoo tib yam li cov khoom siv thermal interface (TIM), R θ cs deteriorated los ntawm 0.5℃/ W txog 2.5℃/ W tom qab rau lub hlis ntawm kev ua haujlwm, thiab qhov sib txuas kub tshaj tus qauv;
Kev tswj lag luam: Tsau tam sim no txwv kev tiv thaiv tsis tuaj yeem hloov mus rau qhov hloov pauv tam sim ntawm lub teeb pom kev zoo, ua rau diode overcurrent thiab burnout.
Optimization Plan:

Cov khoom siv hloov tshiab: hloov nrog SiC Schottky diode, trr luv luv rau 10ns, Qrr txo los ntawm 90%, thiab hloov pauv qhov piv txwv txo mus rau 5%;
Kev txhim kho cua sov: siv cov khoom hloov theem (xws li Chomerics THERM-A-GAP GEL 15) es tsis txhob siv roj silicone, stabilizing R θ cs ntawm 0.4℃/W thiab txo qhov kub ntawm 30 degree;
Kev tswj kev txawj ntse: Qhia txog qhov ntsuas kub ntawm qhov ntsuas qhov sib txuas kom hloov kho lub zog tso zis thiab tsis txhob overheating;
Topology optimization: Txuas 10nF ceramic capacitors nyob rau tib lub sijhawm hla lub diode txhawm rau txhawm rau thim rov qab spikes thiab txo EMI suab nrov los ntawm 15dB.
Kev siv cov nyhuv: Tom qab kev ua kom zoo, qhov kev ua haujlwm ntawm inverter tau nce los ntawm 97.5% mus rau 98.8%, qhov diode tsis ua haujlwm tau rov qab mus rau xoom, thiab lub kaw lus MTBF (lub sijhawm nruab nrab ntawm kev ua tsis tiav) tau txuas ntxiv mus rau ntau tshaj 10 xyoo.