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thyristor control question Thyristor power control exam question The power supplied to a 50I resistive heating element driven from a single-phase 230IV, 50IHz supply is controlled by a thyristor, which operates with a variable firing angle . The circuit arrangement is shown in the diagram below: a) For a thyristor firing angle = 45o, sketch the waveforms of the voltage across and power delivered to the heating element. b) Derive general algebraic expressions for the average voltage and power supplied to the heating element in terms of . c) Estimate the firing angle required for the heating element to be supplied with an average power of 500W. d) The circuit is operated with a firing angle = 45o, which is obtained using a timer triggered from the supply voltage zero-crossing point and calibrated for a 50IHz supply. In practice the supply voltage magnitude is maintained within ±4% and the frequency within ±3% of the nominal values. Calculate the maximum and minimum value of power supplied to the heating element. Solution a) b) c) From the previous part: where Vpk = 230 * (2 = 325 V ; R = 50 Try some trial values of : (degrees) power(W) 0.000 529.000 30.000 513.747 40.000 494.358 35.000 505.254 37.000 501.193 38.000 499.014 37.500 500.116 37.600 499.898 37.550 500.007 37.560 499.985 37.555 499.996 d) From part b): With Vpk = 230 * (2 = 325 V ; R = 50 = 45o, average power = 480 W The average power is proportional to the square of the supply voltage, so maximum voltage corresponds to maximum power, minimum voltage corresponds to minimum power. For the firing angle control, if the supply frequency is lower than the expected 50 Hz, the fixed (2.5 ms) timer produces a firing angle less than 45o, but if the frequency is higher, then the firing angle is larger than 45o. The firing angle is proportional to the frequency error, so the maximum firing angle = 45*1.03 = 46.35o and minimum firing angle = 45*0.97 = 43.65o. Substituting these values into the average power expression: power (W) supply voltage (V) 220.8 230 239.2 firing angle (degrees) 43.65 446.8 484.8 524.4 45 443.2 480.9 520.2 46.35 439.5 476.9 515.8 From which: maximum power = 524 W ; minimum power = 439 W 230 V, 50 Hz heating element thyristor voltage and power 1 Download (/download/link/thyristor-control-question) vs time 0 500 1000 1500 2000 2500 0 45 90 135 180 225 270 315 360 wt (degrees) voltage (V); power (W) _1090090679.unknown _1115304538.unknown _1090088577.unknown All materials on our website are shared by users. If you have any questions about copyright issues, please report (/document/report/thyristor-
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1. Kunto Aji ST., MT 2. Suatu perangkat elektronika yangberfungsi sebagai switch, tidak dapatdigunakan untuk manipulasi arus (/devices-hardware/thyristordantegangan Jenis Thyristor : SCR (Silcon…
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Sort by Newest Thyristor Thyristor - SCR, TRIAC dan DIAC Written by Aswan Hamonangan Sunday, 18 January 2009 00:45 Thyristor berakar kata dari bahasa (/documents/thyristor-55845992098fb.html) Yunani yang berarti ‘pintu'. Dinamakan…
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Questions regarding Thyristors and its control. Download Thyristor Control Question
thyristor Thyristor Theory and Design Considerations Handbook HBD855/D Rev. 1, Nov−2006 © SCILLC, 2005 Previous Edition © 2005 as (/documents/thyristor-55844cbecddcd.html) Excerpted from DL137/D “All Rights Reserved’’…
Transcript thyristor control question Thyristor power control exam question The power supplied to a 50I resistive heating element driven from a single-phase 230IV, 50IHz supply is controlled by a thyristor, which operates with a variable firing angle . The circuit arrangement is shown in the diagram below: a) For a thyristor firing angle = 45o, sketch the waveforms of the voltage across and power delivered to the heating element. b) Derive general algebraic expressions for the average voltage and power supplied to the heating element in terms of . c) Estimate the firing angle required for the heating element to be supplied with an average power of 500W. d) The circuit is operated with a firing angle = 45o, which is obtained using a timer triggered from the supply voltage zero-crossing point and calibrated for a 50IHz supply. In practice the supply voltage magnitude is maintained within ±4% and the frequency within ±3% of the nominal values. Calculate the maximum and minimum value of power supplied to the heating element. Solution a) b) c) From the previous part: where Vpk = 230 * (2 = 325 V ; R = 50 Try some trial values of : (degrees) power(W) 0.000 529.000 30.000 513.747 40.000 494.358 35.000 505.254 37.000 501.193 38.000 499.014 37.500 500.116 37.600 499.898 37.550 500.007 37.560 499.985 37.555 499.996 d) From part b): With Vpk = 230 * (2 = 325 V ; R = 50 = 45o, average power = 480 W The average power is proportional to the square of the supply voltage, so maximum voltage corresponds to maximum power, minimum voltage corresponds to minimum power. For the firing angle control, if the supply frequency is lower than the expected 50 Hz, the fixed (2.5 ms) timer produces a firing angle less than 45o, but if the frequency is higher, then the firing angle is larger than 45o. The firing angle is proportional to the frequency error, so the maximum firing angle = 45*1.03 = 46.35o and minimum firing angle = 45*0.97 = 43.65o. Substituting these values into the average power expression: power (W) supply voltage (V) 220.8 230 239.2 firing angle (degrees) 43.65 446.8 484.8 524.4 45 443.2 480.9 520.2 46.35 439.5 476.9 515.8 From which: maximum power = 524 W ; minimum power = 439 W 230 V, 50 Hz heating element thyristor voltage and power vs time 0 500 1000 1500 2000 2500 0 45 90 135 180 225 270 315 360 wt (degrees) voltage (V); power (W) _1090090679.unknown _1115304538.unknown _1090088577.unknown
Thyristor 1. THYRISTOR SCR, TRIAC dan DIACThyristor berakar kata dari bahasa Yunani yang berarti ‘pintu. Dinamakan demikian (/documents/thyristor-558b1b74b40d7.html) barangkalikarena sifat dari komponen ini yang mirip… Thyristor Disusun oleh : 1. Arif Rohman Habib (36024) 2. Chandra Fadlilah (36030) 3. Kezia Elisabeth A. 4. Rendy Aditya 5. Favian Dwi Vanianto (/documents/thyristor-55b3499d94383.html) (36062) Thyristor Komponen yang bersifat…
Thyristor Thyristor Thyristor adalah komponen semikonduktor untuk pensaklaran yang berdasarkan pada strukturPNPN. Komponen ini (/documents/thyristor-559bf59a18466.html) memiliki kestabilan dalam dua keadaan yaitu on dan off… Thyristor Thyristor (/documents/thyristor.html)
Thyristor Thyristor Family (/education/thyristor-5584a9fc86705.html)
Thyristor 1. Oleh : Riza Lukman (11502241026) 2. Thyristor berasal dari bahasa yunani yang berarti “pintu” Dinamakan demikian karena (/engineering/thyristor-55c226c5a75c8.html) sifat dari komponen ini yang mirip…
Thyristor Thyristor From Wikipedia, the free encyclopedia Circuit symbol for a thyristor An SCR rated about 100 amperes, 1200 volts (/documents/thyristor-558460c9b0d86.html) mounted on a heat sink - the two small wires are… THYRISTOR INSTITUT LATIHAN PERINDUSTRIAN KEPALA BATAS, PULAU PINANG. LAPORAN THYRISTOR NAMA AHLI : AL AMIR BIN (/documents/thyristor-5584686c714a4.html) MOHAMED SULTAN MOHD RAZIMI BIN RAMLI MUHAMMAD JAMAL AZEEM BIN JAMIL MOHD… THYRISTOR komponen elektro (/documents/thyristor-55e7faad7df89.html)
thyristor power control by ir remote 1. THYRISTOR POWER CONTROL BY IR REMOTE ABSTRACT The project is designed to control the speed of an induction motor such (/education/thyristor-power-control-by-iras fans, by using a standard TV remote. In remote.html) home automation…
Industrial Battery Charger by Thyristor Firing Angle Control This project is designed for charging batteries by DC from AC power supply. DC power for a battery charger is derived from a thyristor (/documents/industrial-battery-charger-by-thyristor-firing-anglecontrolled rectifier system. For more… control.html)
6-1 Copyright © 2008 by Jose Bastos Chapter 6 Thyristor Converters Chapter 6 Thyristor Converters Thyristor circuits and their control Slide 1 6-1 Copyright © 2008 by Jose Bastos Line-frequency phase-controlled. Chapter 6 Thyristor Converters Chapter 6 Thyristor Converters Thyristor circuits and their (/documents/6-1-copyright-2008-by-jose-bastos-chapter-6control Line-frequency phase-controlled… thyristor-converters-chapter-6-thyristor-converters-thyristorcircuits-and-their-control-line-frequency-phase-controlled.html)
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