Tallinn University of Technology Department of Electrical Drives and Power Electronics Report on Exercises 2 Diodes Student ******* Code ****96 Group AAVB41 Tallinn 2012 2.1. Diode rectifier VD f = 9 kHz U=6V U = 19.7 V R = 96 k
Microcontroller homework for week 11 1. 2. I would choose schematic C because the Fly-Back on C is with zener-diode and on the output two diodes are used, witch are placed correctly as are the resistors, so the schematic would function as required.
Tallinn University of Technology Department of Electrical Drives and Power Electronics Report Diodes Tallinn 2011 + A VS RV V D - Fig. 1.1. Circuit diagram
Tuled Bi-Xenon- Hella ksenoonlahendus (gaasilahendus) süsteem, kus nii kaug- kui ka lähitule valgus saadakse samast ksenoonlambist. Lähitulelt kaugtulele ümberlülitus toimub elektromagneetilise "katiku" abil. DynaWiew kurvituli- Tuli koosneb kahest reflektorist. Ülaosas on tavaline kaugtuli, alaosas kurvituli. Külgkalde andur lülitab vastavalt vajadusele tööle õige poole kurvitule. FF reflektor- FF (free form) tähendab vaba vormi reflektorit, millele on antud kuju tule iseloomu arvestades. Tulemuseks on eriti hea ja homogeenne, peegeldustevaba valgus. Erinevalt teistest valgustehnoloogiatest ei toimu valguse suunamist klaasi abil. Seetõttu saabki kasutada moodsat siledat klaasi. Halogeen valgus- Tänapäeval kõige sagedamini kasutatav valgustehnoloogia. Halogeenlamp on oma nimetuse saanud klaaskolvis paikneva ja halogeengaasi (enamasti joodi- või broomühendite) järgi. Ksenoon valgus- Ksenoonlamp toodab valgust gaaskaarleegi abil. Ks...
OLED (Organic Light-Emitting Diodes) kuvar Üldist Orgaaniliste valgusdioodidega kuvarites kasutatakse enamasti klaasalust, kuid neid võib teha ka plastmassist või mõnest muust painduvast materjalist aluskilele nagu on tehtud firma Universal Display poolt välja töötatud Flexible OLED (FOLED) puhul. Ennustatakse, et seda liiki kuvariekraanid leiavad lähemas tulevikus laialdast kasutust mobiiltelefonide, pihuarvutite, digikaamerate jt. käsiseadmete juures. Esialgu on OLED-ekraanide puuduseks suhteliselt lühike tööiga (ca 1000 tundi), kuid juba lähemal ajal loodetakse saavutada 10000 tunni piir ja võimalikuks peetakse kuni 90000-tunnise tööea saavutamist. Tööpõhimõte ja ehitus OLED koosneb elektrit juhtivast orgaanilise materjali kihist, mis paikneb kahe elektroodi (anood ja katood) vahel. Neid materjale nimetatakse orgaanilisteks pooljuhtideks, sest omavad juhtivustasemeid isolaatorist juhini. Enamus tänapäevased OLED-id on kahekihilised...
This average current IF is the rate a diode can handle up to the forward direction when used as a rectifier. Another entry of interest in the data sheet is the forward voltade drop UF(max) when the maximum forward current occurs. An usual diode has this value 0.7-2.0V. Diode conducts easily when forward biased. Reverse biasing. The reverse current is a leakage current at the source rated voltage. Typically, silicon diodes have 1-10 microA and germanium 200-700 microA of leakage current. This value includes thermally produced current and surface leakage current. Only these currents take place, when a diode is reverse biased. At breakdown, the diode goes into avalanche where a number of carriers appear suddenly in the depletion layer. With a rectifier diode, breakdown is usually destructive. 4)Typical values: Uknee- approximatly 0.7V; UF 0.7-2.0V; leakage (IR) 1-10 microA/200- 700microA.
· The induction machines are associated with the names of Dolivo-Dobrovolsky Tesla · One of the first eletrical motors has been built by Jacobi · Electromagnetic efficiency is measured in tesla · Time constants are measured by ms s hours · Who is the author of the first electrical motor Henry · Which rectifier cannot be built without a transformer 3-phase midpoint · Call the benefits of 3-phase rectifiers upon the 1-phase ones output voltage · Which rectifier has more diodes 3-phase bridge · In the case of high-pass filter before the load, what can you tell about the current higher · What is the difference between the construction and operation of a rectifier and an inverter input wave output wave · What are the advantages of a single-phase bridge inverter high efficiency high reliability · What kind of control provides the highest output power of the inverter block · What load inductance provides the interruptible output current zero
frequency. Flyback protection must also be added. Using Google, you found four possible circuits to use. These four circuits are shown in the below Figure. A B. . C. D. Which circuit will you use that can satisfy all given specifications? Justify your answer. Solution: Specifications state (with circuits adhering in square brackets): ESD protection(high and low swing)[A,C] (B diodes wrong way around, D none) ESD rise time limiting [C] (all others no series resistor) Flyback protection [B,C] (others has none) Release time max 2.2ms [B,C] (others has none, p. 139 table, more than 6V yback) The only circuit that satisfies all specifications is C.
B: 1 1 1 0 ON ON ON ON ON OFF ON OFF A:CC B: 1 1 1 1 ON ON ON ON ON ON ON ON A:CC B:CC The diodes, D1-D8, protect the transistors against the coil flyback voltagewhen the transistors are turned off. The motor shaft is rotated by applyingdrive voltage to each input in the proper sequence. 4. Shoot-through, also known as cross-conduction. This is the condition that occurs when the upper and lower transistors on the same side of the coil turn on at the same time. If two transistors turn on at the same time, there will be a very low impedance between the supply
ELEKTROONIKA ALUSED Elektroonikaseadmete koostaja erialale 2007 SISUKORD 1. POOLJUHTIDE OMADUSI............................................................................................................................................3 1.1.Üldist..........................................................................................................................................................................3 1.2. Elektrijuhtivus pooljuhtides......................................................................................................................................3 1.3.P-N-siire ja tema alaldav toime (The P-N Junction) .................................................................................................6 1.4. P-N siirde omaduste sõltuvus temperatuurist (Temperature Effects) ......................................................................8 1.5. P-N-siirde omaduste sõl...
Or, a second geartooth wheel, mounted on the same shaft but having a different pattern or with a single tooth, can be used to identify the reference position. The output of the VRS is typically amplified and passed to the micro- processor through a comparator or directly to an ADC input. The output amplitude from the VRS increases as the shaft speed goes up. For systems with a wide range of shaft speeds, it may be necessary to limit the voltage at the input amplifier with a zener or with diodes to the supply rails. The VRS produces a bipolar output, with a negative component. Single- supply systems should bias the VRS to half the supply voltage (Figure 3.27B) before amplifying the signal. Note that the bias point must be a low imped- ance at all the frequencies at which the VRS will operate, or the overall gain Sensors 85 Figure 3.27 VRS. of the system will be reduced
574 p. ISBN: 0471126624 8. Benda, V., J. Gowar, and D. A.Grant, Power Semiconductor Devices: Theory and Applications, Chichester; NY: Wiley, 1999. 419 p. ISBN: 047197644X 9. Bradley, D. A., Power Electronics, NY: Chapman & Hall, 1994. ISBN: 0412571005 10. Brown, M., Practical Switching Power Supply Design, San Diego: Academic Press, 1990. 240 p. ISBN: 0121370305 11. Bürkel, R. and T. Schneider, Fast Recovery Epitaxial Diodes (FRED): Characteristics, Applications, Examples, Lampertheim: IXYS Semiconductor Data Book, 1998 12. Cattermole, K. W., Principles of Pulse Code Modulation, NY: Elsevier, 1969. ISBN: 444197478 13. Circuits and Components for Power Electronics, Berlin; Munchen: Siemens Aktiengesellschaft, 1988. 33 p. ISBN: 3800938758 14. Dorf, R. and Bishop, R., Modern Control Systems, Addison-Wesley, New York, 1995. 807 p. ISBN: 0201845598 15. Erickson, R. W. and D
ELEKTROONIKA ALUSED Elektroonikaseadmete koostaja erialale 2007 SISUKORD ........................................................................................................................................... 24 I...................................................................................................................................... 25 U2.................................................................................................................................. 25 ........................................................................................................................................... 25 VD2................................................................................................................................ 25 ...
whole system including the PC is less than 5 times per minute. Countermeasures are required if the frequency of load switching for the whole system including the PC is more than 5 times per minute. Countermeasure Examples When switching an inductive load, connect a surge protector, diodes, etc., in par- allel with the load or contact. For detailed circuit examples, refer to the relevant parts of this manual. 6-5 CPM1A-MAD01 Conformance to EMC Directives Immunity testing conditions when using the current I/O of the CPM1A-MAD01 are as follows. • Total accuracy: +10%/-1%
1·1 Chapter 1 Routine maintenance and servicing 1 Contents Air cleaner element renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 Fuel filter renewal - fuel injection engines . . . . . . . . . . . . . . . . . . . .36 Alternator drivebelt check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 Hinge and lock check and lubrication . . . . . . . . . . . . . . . . . . . . . . .31 Automatic transmission fluid level check . . . . . . . . . . . . . . . . . . . . .27 ...
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