GaN Power PCB Design le Litšebeletso tsa ho Etsa

GaN Power PCB: Ho Hlalosa Bocha Moqapi oa Matla a Phahameng a Phahameng

PCB ea matla ea GaN (eo hape e bitsoang Gallium Nitride PCB kapa GaN-based power board) e etselitsoe lisebelisoa tsa motlakase tsa moloko o latelang. Ka ho nkela silicon sebaka ka lisebelisoa tsa GaN, liboto tsena li fihlella phetoho e potlakileng ea nanosecond, ts'ebetso e phahameng, le matla a matla a ke keng a lekanngoa-a loketseng bakeng sa lits'ebetso tse kang ho tjhaja ha EV, li-inverters tsa matla a tsosolositsoeng, lisebelisoa tsa sefofane, le li-module tsa motlakase oa telecom.

Hobaneng ha Matla a GaN a fapane

GaN (Gallium Nitride) ke semiconductor e pharalletseng e lumellang li-transistors ho fetohela ho 10x kapele ho feta li-MOSFET tsa setso. Mohlala, GaN FET e ka fetoha ho tloha ho 0V ho ea ho 600V ka tlase ho 5ns, e fokotsa haholo tahlehelo ea matla le ho nolofalletsa meralo e kopaneng, ea maqhubu a holimo.

Ho Rala Mathata ho GaN Power PCBs

Mabelo a feteletseng a ho fetola a etsa hore sebopeho sa PCB se be bohlokoa. Esita le 1nH ea ho kenella ha parasitic e ka baka tšenyo e feteletseng ea motlakase. Ho netefatsa ts'epo, Highleap Electronics e sebelisa mekhoa e tsoetseng pele e kang:

• Li-loops tse fokolang tsa matla li lekantsoe ho limilimithara
• Ka li-arrays bakeng sa phallo e emeng ea hajoale e nang le inductance e fokotsehileng
• E ntlafalitsoeng ka trace geometry, the grounding, le taolo ea likokoana-hloko

Melemo ea Ts'ebetso

Ha li entsoe le ho etsoa hantle, li-PCB tsa matla tsa GaN li bula maemo a ts'ebetso a ke keng a fihlelleha ka liboto tsa silicon:

• Katleho e atamela 99% ka tahlehelo e fokolang ea matla
• Matla a matla a fetang 100W/in³ bakeng sa lisebelisoa tse kopanetsoeng
• Fetola maqhubu ho fihla ho 10MHz e nolofalletsang limakenete tse nyane

Ho Highleap Electronics, re kopanya tlhahiso e nepahetseng ea PCB le theknoloji e matla ea koporo e pakiloeng ho tšehetsa meralo e boima ea GaN. Litšebeletso tsa rona tsa tlhahiso le kopano li netefatsa li-PCB tsa motlakase tsa GaN tse tšepahalang, tse ka atolosoang le tse sebetsang hantle bakeng sa liindasteri tsa bohlokoa lefatšeng ka bophara.

Ho fokotsa Loop Inductance ho GaN Power PCBs

Ka moralo oa PCB oa motlakase oa GaN, esita le li-nanohenries tse 'maloa tsa inductance li ka baka ho putlama ha motlakase ho kotsi le tahlehelo ea ts'ebetso. Ho fapana le meralo e tloaelehileng ea silicon moo hona joale e phallang ka mokhoa o otlolohileng ho theosa le boto, GaN e hloka litsela tse khuts'oane tsa morao-rao, tse otlolohileng ho boloka phetoho e tsitsitse ka lebelo la nanosecond.

Kamoo Highleap Electronics e Fokotsang Inductance

Re sebelisa mekhoa e tsoetseng pele ea ho bokella le ho hlophisa ho fihlela ts'ebetso e tšepahalang lits'ebetsong tsa GaN:

• Sephutheloana se ntlafalitsoeng sa PCB - Lifofane tse haufi tsa matla le tsa fatše tse arohaneng ka dielectric tse tšesaane bakeng sa sebaka se fokotsehileng sa loop
• Boima bo phahameng ka li-arrays - Li-vias tse 20+ tse behiloeng ka kotloloho libakeng tsa khokahano bakeng sa phallo e emeng ea hajoale
• Tsela ea sefofane - Ho sebelisa lifofane tsa koporo sebakeng sa mesaletsa ho fokotsa likokoana-hloko
• Ho beha karolo ka nepo - Bakhanni ba liheke ka har'a 5mm ea GaN FETs le li-capacitor tse amanang ka kotloloho le vias

Lebaka Leo e Leng ea Bohlokoa

Mekhoa ena e fokotsa loop inductance ho ea ka tlase ho 2nH-ho fihla ho 10× tlase ho feta meralo ea setso ea PCB.
Sephetho ke ts'ebetso e tsitsitseng ea maqhubu a phahameng, ho fokotseha ho feteletseng, le ts'ebetso e phahameng ka kakaretso.
Ea rona e pakiloeng matla a phahameng a matla a PCB boitseanape bo netefatsa hore lits'ebetso tse thehiloeng ho GaN li fihlella ts'ebetso e phahameng ntle le ho senya ts'epahalo.

Litlhoko tsa Heke Drive Precision

Liheke tsa GaN li senyeha habonolo—li feta 7V ’me lisebelisoa li hlōleha ka ho sa feleng. Ho fapana le li-silicon MOSFETs tse mamellang ± 20V, GaN e hloka ho nepahala ho felletseng. Empa ho fana ka motlakase o nepahetseng oa heke ha o ntse o fetola makholo a li-volts ho li-nanoseconds ho phephetsa esita le baqapi ba nang le boiphihlelo.

Tharollo: Kelvin source connections. Motlakase oa motlakase o phalla ka tsela e le 'ngoe ha litšupiso tsa li-gate drive li bua ka khokahanyo e fapaneng e se nang hona joale. Sena se felisa liphoso tsa motlakase ho tloha ho motlakase oa motlakase.

Ho hanyetsa ha heke ho etsa qeto ea ho fetola boitšoaro:

• Tlase haholo (<1Ω): Ho sisinyeha ho senyang
• Holimo haholo (> 10Ω): Litahlehelo tse fetelletseng tsa switching
• E nepahetseng (2-5Ω): Ts'ebetso e leka-lekaneng

Re beha lihanyetsi tsa liheke ka kotloloho lisebelisoa tsa GaN, eseng ho bakhanni. Liphutheloana tsa Surface-mount 0402 li fokotsa inductance ea likokoana-hloko. Tsela ea ho latela e le lithapo tse laoloang tsa phetiso ea impedance. Lintlha tsena li bontša hore na GaN e phethahatsa tšepiso ea eona kapa e hloleha ka mokhoa o makatsang.

Taolo ea Mocheso bakeng sa Matla a Tiileng

Ho sebetsa hantle ha GaN hoa hlolla—98% ha se ntho e sa tloaelehang. Empa 2% e setseng e tsepamisitse maikutlo libakeng tse nyane tsa lefu. Mofetoleli oa 100W o qhala 2W feela, empa mocheso o futhumatsang o feta 100W/cm²—e leng holimo ho feta rocket nozzle.

Traditional mogote vias ke ke sebetsana densities tsena. Re fana ka lits'ebeletso tse akaretsang:

• Via-in-pad arrays ka ho toba tlas'a lisebelisoa
• 0.2mm ka tsela ea 0.4mm ea khekhe ea linotsi
• Ho tlatsa koporo bakeng sa conductivity e phahameng
• Ho kopanya ka ho toba ho heatsinks kapa lipoleiti tse batang

Bakeng sa lits'ebetso tse feteletseng, lichelete tsa tšepe tsa koporo tse kentsoeng li fana ka litsela tsa ho hanyetsa mocheso oa zero. Li-blocks tsena tse tiileng tsa koporo, tse kopantsoeng nakong ea lamination, li theola mocheso oa 20-30 ° C khahlano le mefuta e mengata.

Khetho ea thepa e ama ts'ebetso ea mocheso haholo. 0.3W/mK ea FR-4 e tloaelehileng e baka litšitiso. Re fana ka li-laminate tse ntlafalitsoeng ka mocheso (1-3W/mK), li-substrate tsa tšepe-core (5-380W/mK), le likhetho tsa ceramic (20-170W/mK). Bokhoni ba rona ba PCB ba taolo ea mocheso bo netefatsa hore lisebelisoa tsa GaN li lula ka har'a meeli e sireletsehileng ea ts'ebetso.

Lisebelisoa tsa High-Frequency le EMI Control

Ha u fetola li-megahertz tse ngata, lisebelisoa tsa PCB li ama ts'ebetso ea potoloho. Tloaelo ea tahlehelo ea FR-4 (0.02) e baka mocheso o feteletseng ho feta 1MHz. Lisebelisoa tsa maqhubu a phahameng li fetoha tsa bohlokoa.

Re sebetsa khafetsa:

• laminate e khethehileng e nang le tahlehelo e tlase (tahlehelo e otlolohileng 0.0037)
• Isola I-Speed ​​(litšenyehelo tse leka-lekaneng/ts'ebetso)
• Likarolo tsa PTFE (ts'ebetso ea ho qetela)

Empa thepa e sa tloaelehang e eketsa litšenyehelo tsa 3-5x. Li-stackups tsa Hybrid li ntlafatsa ts'ebetso le litšenyehelo - lisebelisoa tsa maqhubu a holimo feela moo ho hlokahalang, maemo a FR-4 libakeng tse ling.

EMI e hlahisa liphephetso tse ikhethang. Meeli e potlakileng ea GaN e hlahisa matla ho tloha ho DC ho ea ho 1GHz. Ntle le moralo o nepahetseng, likhase tse kotsi li feta meeli ka 30dB. Re kenya tšebetsong thibelo e haufi le tšimo ka ho fokotsa li-node tsa ho fetola, tšireletso ea sefofane sa fatše, le taolo ea sekhahla sa moeli moo ho amohelehang. Mekhoa ena ho tsoa phihlelong ea rona ea PCB ea matla a ho fetola e netefatsa hore e latela melao.

Lipotso Asked hangata

Q: Ke eng e etsang hore GaN e be betere ho feta silicon MOSFETs?
A: GaN e fetola 10x ka potlako ka tahlehelo e tlase haholo, e nolofalletsang 99%+ ho sebetsa hantle le matla a 3-5x. Highleap Electronics e ntlafatsa meralo ea PCB ka li-loops tsa motlakase tse ka tlase ho 2nH, litsamaiso tse laoloang tsa impedance, le taolo e tsoetseng pele ea mocheso ho fumana melemo ena.

P: Liqholotso tse kholo ka moralo oa GaN ke life?
A: Mathata a mantlha a kenyelletsa phokotso ea li-parasitic inductance, litlhoko tse nepahetseng tsa koloi ea heke, mahloriso a mocheso, le taolo ea EMI. Highleap Electronics e sebetsana le tsena ka li-stackups tse khethehileng, ka ho ntlafatsa, ho laola mekhoa ea ho itšireletsa, le tlhahlobo e feletseng.

P: Na meralo e teng ea silicon e ka sebelisa GaN ka kotloloho?
A: Ke ka seoelo—GaN e hloka tlhophiso e felletseng ea sebopeho. Highleap Electronics e thusa ho lekola meralo e teng le ho nts'etsapele litharollo tse ntlafalitsoeng tsa GaN, hangata e fihlela phokotso ea boholo ba 50% le ntlafatso ea 3-5% ka katleho ea rona. Mokhanni oa LED PCB boiphihlelo ba ho ntlafatsa.

P: Ke li-switching frequency tseo GaN e ka li fihlelang?
A: GaN e thusa 100kHz ho 10MHz+ tshebetso. Highleap Electronics e etsa li-PCB tse ntlafalitsoeng bakeng sa maqhubu ana a sebelisa thepa ea tahlehelo e tlase, impedance e laoloang, le likokoana-hloko tse fokolang tse netefalitsoeng. PCB ea ho tjhaja waelese dikopo.