Kondensaator C = Q/P ; [F] 1 - dielektrik 2 - metall plaat S U Pinge d- Film Capacitor (Kile kondendsaator) Isolatsiooni kile paksus 2-20 mikromeetrit, Parameeter Polüester Polükarbonaat Polüstüeer Mahtuvus 100pF - 22nF 100pF - 68µF 10pF 0,5µF Sagedus 1MHz 1MHz 10MHz Tolerants ±5-20% ±5-10% ±1-5% C pinge 1600V 400V 500V Elektrolüüt kondensaator
G(gate). 8)Triacs can operate in power modes of 1,5kV and 100A. If Ploss = Pout, the efficiency is approx. equal to: 25% 50% 75% 100% If a transistor has an emitter current of 10mA and a collector current of 9,95mA, what is the base current (A)? 0,05 19,95 50 19950 Ticket No7 1)Emitter-follower.2)The base ac voltage produces an emitter ac current.Thanks to the limiting resistor RB and the coupling capacitor CB, an ac voltage appears at the emitter.The biasing is arranged with the help of R1 and R2.Because of the output capacitor C, this voltage is coupled to the load.Since the emitter is no longer at ac ground, the ac voltage across the emitter is approximately equal to the input voltage at the base.The reason the circuit is called an emitter follower is because the output voltage follows the input voltage. 3) 4)current,ac,feedback.5)analog, class A 6)
Tallinn University of Technology Department of Electrical Engineering Filters Report on Exercise 5 in AAR3320 Electronics and Semiconductor Engineering Student: Student Code: Study Group: Instructor: Prof. Valery Vodovozov Tallinn 1. RC filter R Vnoise 1000Ω 15 Vrms 11kHz 0Deg RL V C1 11kΩ 7.23µF 11.23 Vrms IC=0V 11 Hz 0Deg Figure 1. Circuit diagram of the low-pass RC filter Calcul...
DC injection braking requires a single DC supply, disconnection of AC supply. At DC injection braking the following motor windings can be supplied: 3 stator The double-star connection, as compared to the star connection, the breakdown speed is more. The double-star connection, as compared to the star connection, the syncronous speed is more. The double-star connection, as compared to the star connection, the starting torque is less. The capacitor braking is used in the applications of low power. At the standard supply and p = 4, the motor speed >300. At the double-star connection, as compared to the star connection, the synchronous speed is more. Select the drawbacks of the across-the-line starting of the squirrel-cage induction motor: high run-up current At asymmetrical supply, as compared to symmetrical supply, the starting torque can be less or even zero. The cheapest braking mode is coasting.
In the flash ADC the resistor string provides a reference for each compara- tor. On the tracking and successive approximation ADCs, the ladder is part 24 Analog Interfacing to Embedded Microprocessors of the DAC in the feedback path. The problem with the resistor ladder is that the accuracy of the resistors directly affects the accuracy of the conversion result. Although modern ADCs use very precise, laser-trimmed resistor networks (or sometimes capacitor networks), there are still some inaccuracies in the resistor ladders. The sigma-delta converter does not have a resistor ladder; the DAC in the feedback path is a single-bit DAC, with the output swinging between the two reference endpoints. This provides a more accu- rate result. The primary disadvantage of the sigma-delta converter is speed. Because the converter works by oversampling the input, the conversion takes many clocks
· How many thyristors are required for the cycloconverter with the three-phase output 18 · What does the term "a direct ac converter" mean without rectifying without energy storage · What is the most obvious use of the cycloconverter low-frequency · Why does a matrix converter need full controlled devices to change current · Why a device is called as "dc link converter" internal dc circuit · What does the dc link converter consist of rectifier inverter capacitor · What are the applications fields of cycloconverters rolling mills · What does a continuous current means non-pulsing · Call the difference of half-bridge and full-bridge dc/dc converters input/output voltage ratio · Why the transformer-isolated converters are used voltage set-up · Why the back diodes are required current reversing · In the steady state mode, the drive has pulsations ripples · In the very accurate drive, the over-speed is 1..10%
• Do not touch the cold junction compensator. Doing so may result in incor- rect temperature measurement. ! Caution Always clear memory before beginning to program the CPM1A. Although memory is cleared before the CPU Unit is shipped (except for bits with specific functions), AR 1314, which turns ON when the internal capacitor cannot back up memory, may have turned ON during shipment. ! Caution If the CPM1A will be turned off for periods exceeding the data backup period of the internal capacitor, design the system so that it will not be influenced if data in the DM, HR, and CNT areas is cleared when power is turned off.
Praktiline elektroonika I Analoogskeemid Veljo Sinivee [email protected] Kondensaatorid · Kondensaator on nagu veeanum kogub elektrone.Erinevalt veepurgist on tühjas kondes alati elektrone · Juhib vahelduvvoolu, alalispingele lõpmatu takistus (v.a. laadimisel). Miks? · Polaarsed, mittepolaarsed ja unipolaarsed konded · Max. pinge, töötemperatuur, ehitusest tulenevad omadused (induktiivsus, lekkevool jne). · Ühik Farad (Maa mahtuvus ca 700 nF). Skeemil sümbol C · Kasutatakse pinge silumiseks toiteallikates (vihmaveetünn) ; viidete tekitamiseks; filtrites; signaali ahelates alalispinge blokeerimiseks. Sügis 2010 Praktilise elektroonika loeng 2 Konded · Silub, võimendi toide nt. Samuti kasulik patareiga paralleelselt vähendab toiteallika sisetakistust · Ma...
3 Püsikondensaatorid Sõltuvalt kasutatavast isolatsioonimaterjalist liigitatakse püsikondensaatorid kile, keraamika-ja elektrolüütkondensaatoriteks. Varem kasutati laialdaselt ka veel paber-ja vilkkondensaatorid. Kilekondensaatorite isolatsiooniks on mingi sünteetiline kile paksusega 2...20um ja plaatideks alumiiniumfoolium või kile pinnale kantud metallikiht. Ehituslikult on enamlevinud rullkondensaatorid, mille ehitus selgub jooniselt 2.3. Film capacitor JOONIS 2.3. ELEKTROONIKAKOMPONENDID lk. 13 Eri tüüpi kilekondensaatorite põhiandmed on võrdlevalt toodud tabelis 2.1 Tabel 2.1 Parameeter Polüester Polükarbonaat Polüstüreen Mahtuvus 100pF...22nF 100pF...68uF 10pF...0,5u Töösagedus 1 Mhz 1 Mhz 10 Mhz
The principle of the impedancemetry is aspects, such as a microbial detection or based on the ability of a medium to pass chemical contaminations. As was explained an alternating electrical current. When the in the beginning of this chapter, the dielectric impedance is not depending on the frequency, dispersions measured in the impedance of the system works as a resistive media; other- meat with capacitor equipment (Fig. 25.6) are wise, as in the biological tissue and colloidal produced at different ranges of the frequency systems, the impedance has resistive, capaci- of the electric field imposed on a meat sample. tive, and inductive components (Damez and At high frequency, the dispersion produced Clerjon 2008). Meat tissue is composed of is in the dipolar mechanisms (such as water
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