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Tech Briefs, Electronic Components & Circuits... 97-11... National Aeronautics & Space Administration.... November 1997 PDF

61 Pages·1997·14.6 MB·English
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Preview Tech Briefs, Electronic Components & Circuits... 97-11... National Aeronautics & Space Administration.... November 1997

Electronic Components and Circuits Electronic Systems Physical Sciences Matheand minaformtatiion cScisenc es November 1997 Avaiolf NAaSA bTecih Blrieifs tandy TSP ’s Distribution of NASA Tech Briefs, a monthly periodical publication, is limited to engineers in U.S. industry and to other domesic technology transfer agents. Requests for individual Tech Briefs or for ‘Technical Support Packages (TSP's) announced herein should be addressed to NASA Center for AeroSpace information Technology Transfer Office 800 Elkridge Landing Rd. LinHteighhts,i McD 21u090m-29 34 TeleNop. (h301o) 6n21e-02 45 Piease reference the three-letter five-digit control number located at the end of each Tech Brief. infor- mation on NASA's Technology Utilization Program, ite documents, and services is also available at the same facility Technology Utilization Officers and Patent Counsels are located at NASA field installations to provide technology-transfer access to industrial users. Inquiries can be made by writing to NASA field instalia- tions listed below. Technology Utilization Officers and Patent Counsels Ames Research Center John F Kennedy Space Jet Propulsion Laboratory John C. Stennis Spece Center Technology U™zation Officer Officer Technology Utilization Officer Technology Utilization Officer Mail Code 223-3 Mail Stop Mail Stop 156-211 Code HA-30 Moflett Fisid, CA 94035 KenSpance Ceertedr, FyL 32 809 4800 Oak Grove Drive Stennis Space Center, MS 39529 PasadeCnA a91,10 9 Patent Counsel Patert Counse! Mail Code 200-1' Mail Cade PT-PAT Mofiett Fieid, CA 94035 KenSpance Ceentedr, FyL 32 800 GodSpdacea Flirght dCen ter Langley Research Center NASA Resident Office-JPL Utilization Officer Technology Utilization Officer Technology Utiization Officer Technology Utilization Officer Code Mail Code 702-1 Mail Stop 143 Mail Stop 180-801 WashingtOCo 2n05,4 6 Greenbelt, MD 20771 Hampton, VA 23665 4800 Oak Grove Drive Pasadena, CA 91100 Assistant Genera! Patert <ounee! Patent Counsel! Coufonr Psatenet Mlatte rs h4all Corte 204 Mail Code 279 Patert Counse! Code GP Greer’oeit, MD 20771 Hampton, VA 23665 Mail Code 180-801 WashingtOCo 2n05,4 6 4800 Oak Grove Drive PasadeCnA a91,10 9 Lyndon B. Johneon Space Lewie Reese ch Center C. Marshall Space OryFlidght eResnear ch 7) >f meadaeeaal Center Utiization Officer Mow % Utilization Officer Utiization Officer Mail Code IC -4 21000 Grrakperk Road Code WS 021-31 Houston, TX 77056 Cleveland, OH 44135 — — Patent Counse! Patent Counse! EdwarCdA s93,52 3 Mail Code AL3 Mail Code LE-LAW Patent Counsel Houston, TX 77058 21000 Brookpark Road Niels Co de COO! Cleveland, OH 44135 MarsSpahce aFiglht lCent er > 97-11 47 Machinery 53 Matheand minfaormtatiion cScisenc es 3|@#3l//e90l/ e0l e This document wes prepared under the sponsorship of the National Aeronautics end Space Administration. Neithte Uhniteed rStat es Government nor any person acting on behall of tho United States Government essurnes any lability resulting from the use of the information contained in this document, or warrants that such use will be free from privately owned rights. ANT -: aa NASA Tech Briefe,N overnb1d0r9 7 > 5 Electronic Components and “=< - Circuits. —-~ = ~ Hardware, Techniques, and Processes 7 Signal-Decay Technique for Determining Os of Power inductors 8 BidirEelecctrotnici Ciorcunit aBrleak er G Slotted CarbonGr/idsC foar lron bAcceolernato rs NASA Tech Bnets, Novernber 1997 5 Signal-Decay Technique for Determining Qs of Power Inductors There are no switches in the test inductor/capaciltoooprs. An improved resonent-signel-decay techrique hes been devesd fo measuring @ectica iosses Fn quas-inem inductors of the type hat we used n modem eectoric POwerCr-ouias aund pthatp avle tyypica lly Operated at tequencies up t about 100 i¢tz. The basic resonent-signel-decey tectrique hes besn used since the ently years of electrThoe enssiencce sof. t he basic techrique is t comect an induc wih a low-oss capacitor in a sinpie loop resonart cro, apply a one-dhot pulsed agra! t exits caciations at fhe resonance feqaund maeasunre tche ryate o,f Ga cay of the signal to determine the electical ines in te Gad af the resonance tequarsy. (Custdecoticmal assr ist eqvyres,sed in terms of a resonance quailty factor, O = wWa, vwrere f = te merrarce tequarcy and a= the rate feckrocal ofc Charactaisic Figure |. A One-Ghot Transient Signal ts Excited int he nductor-end-capactioy resonant loop by momertary application of en ac signal Guring a tigger putes. The digits! cscioscape reconis fhe renfing decaying ceciiaton ing electrical losses are minwrized by avcid- sco 4a00l (MOaSve stF preEsent,T bust the) cou t is configured and operated in such a wey that $s the losses roduced by te MOSFET {- 0 Us sanannnnnnn -100 800, 300 #00 a5 7) Ge ge" Tens Miliseconds Four Ocselfiation was recorded in the crouf of Figure | with a test capacitor of 0.22 fF ard « tenfie-core inductor of 35.6 1. and Scott S.G erbofe NrYMA inc., for Lewls Research Center. Further infor- mation is contained in a TSP jsee page 1} 7-3, 21000 BrookRoapd,a Clreveklan d, Ohio 44135. Rater toL EW-16444. >> 18m cite fanennttaip—iip— 2 3smOsSWw a Figure |. This Gidivections! Electronic Cireutt Greater cortains tower parts han do offer electonic circust breaters, yet is precise enough for ( onging purpose. An @ecvonc crow bree és 18 Gesigned to tip a@ & noming direct ov- 2 rert of 5.6 A for more, Gapending on tern- °- fu f °C wr ——_ 3 +28 °C | rf ements ac ftRE b) trees... Vie ‘Fr ob i = aS aD i —= a ee a i 1 2s46867 © => 206M 7 1 Top Tene, ms Figure 2. The Cirreult Greater te Wipped rio tsn-cf when the port fat represents ts open ing condion tes on or above the curve tor the operaiing termpersture Note that fhe crroust isn ot Wipped by large asrert pulses ghorte: an abou | ma. the load current equals or excesds the below ther conducting treshoids. Thus, Gesired tip level, the voRage across tis the MOSFETs ave turned off, interrupting resistor equals of exceeds the turn-on the path for the load currert. tveshold bese-to-ervonRaiget iofe orn e The latching croult inchudes a resistor/ of the 2N22non2 ta2neiAstor s. Capacitor Gsiay crout that mates the cr- The turning on of ether 2N2222A non Gut Dreater inseriiive to © current surge vaneistor causes the turn-on of tte shorter then abou | ms (ese Figure 2). 2N2907A pnp wansiswhticho irs, th e Onoe the circuit breaker has been tripped actve semen of @ istching cro, When by overourTened rutrd, ft ig resett,h e thus activated, the latching croutt lowers ticring Grout hokis fti n the “of” cond- the voRages on the MOSFET gates ton. Reset is accomplished by tuning NAGA “xh Briefs, Novernib1e9r9 7 of, then turing on te isolated 24-Vcc Corp. for Lewis Research Center. Dower SUDDIy Further nformisa cotntaiinoed nfn @ This work wes done by Tomasz TSP jsee page1 } Kacheisi of Rockwell intentional inguiies concenigr’tsn foir tnhe gcor n- A Stotted Carbon/Carbeon Grid coutd be machined at relatively low cost. The grid would erode aiong the cents lines of the webs between the stots. fis erosion pattern would delay svuctural tafure gots inc arboryswcetas risb ano e:de n ess Ten 14 tet of moods’), i gon of te cona t desorbed nn “on eppesrs that a siotted carborvcanr gbi d AccsGrii,e Wirth aGontgatced sHol us* sould heve a operatHie o16n tgime s (NPO- 19338), (WASA Tech Briefs, Vol. 20, No. 1, Uenuary 1996), page 34. One rmee- borvshecet.a Macrhinibng oin tnris p at- tern would leave « large number of uno ers ederncing across the 1.4 clarnete of fhe gid, resufing in a substantinicraelas e in te etifiness of the gid over that of a gid wih a heagond pattern of crouéer holes. The cost of machining the gid sts has been estimtao tbee adbou t 1/6 that of mactwing gid holes in a hexagone pat- ten. The main reason for the decrease in @s Cortered in the webs between sits. in Cost is tat for a gid of 8 given size e.g. tvs case, eosion cornpistrtouaghl yth e @ Gamneter of 14 on anc tictvwes of 0.5 ticles would nol case immnedate mer) the nusniber of slots (about 50) woud oructre thre, cote, i woud Gide be much emalier than the number of holes each web into two narrower paraiel webs. (about 4,000). i hes been estimated fal a peraiel-cot This work was done by John R. Brophy, gid woud lest free Wres as borg os D. Kye Grown, Juergen Musie, and would @ round-hole/hexagonel-pattern Coates E Gane of Cates) for NASA's 0 of the sane material, taking tis factor Jet Propuision Laboratory furthe nt. in combiwithn thae ltoweri raote onf e ro- mation is cortained ina TSP isee page |) gon of carborvcarbon jemected to be NPO- 19679

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