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thyristors

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Published: 09 June 2014
Fig. 8 Schematic of a thyristor, showing four layers of alternating N and P-type material More
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Published: 09 June 2014
Fig. 9 Switching characteristics of conventional thyristor More
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Published: 01 August 2018
Fig. 44 Thyristor gate arrays imaged through 0.51 mm (0.020 in.) of overlying [100] cut silicon. The annular rings combined with the underlying silicon wafer make up a 5 kV, 2 kA gate-turnoff power device. (a) This device shows well-attached and well-formed finger arrays. (b) This device shows More
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Published: 31 October 2011
Fig. 13 Current profiles with (a) thyristor-controlled and (b) inverter-controlled welding machines More
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Published: 01 January 1993
Fig. 2 Starting current waveforms of two power sources to show relative response times of each source. (a) Thyristor-controlled source. (b) Inverter-controlled source. Faster response of inverter-controlled arc welding machine (2 ms to go from 0 to 100 A) indicates a more stable arc. More
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Published: 15 December 2019
Fig. 14 Back-reflection white-beam x-ray topograph recorded from a 6H-SiC single crystal with thyristors fabricated on it. The small white spots distributed over the image are 1 c and larger screw dislocations. The location of these dislocations with respect to the device topology can More
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005836
EISBN: 978-1-62708-167-2
... direct-current power supplies electrical circuits induction heating induction heating power supplies insulated-gate bipolar transistors low-frequency power supplies metal-oxide semiconductor field-effect transistors power factor routine inspection safety precautions switching units thyristors...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004118
EISBN: 978-1-62708-184-9
.... If the voltage goes higher than 12 V, the gate circuit will turn on one of the two thyristors depending on polarity, dc current will begin to flow, and cathodic isolation will be interrupted until the voltage again drops below 12 V. For unbalance currents of up to 90 A ac (depending on the steady-state current...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005899
EISBN: 978-1-62708-167-2
... frequency. Figure 16 shows the load curve in dependence on the current and voltage of a converter with constant load regulation. Current and voltage therefore are each between 70 and 100% of their nominal value for melting operations at full power. Such converters are constructed as thyristor converters...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006466
EISBN: 978-1-62708-190-0
... characteristic may change. Integrated circuits, ceramic capacitors, and thyristors that contain defects of this type are examined in this section. Integrated Circuits (ICs) A typical silicon IC chip (die) generates heat during its normal operation. The heat must be dissipated to stabilize the electrical...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001356
EISBN: 978-1-62708-173-3
... for GTAW are usually the constant-current type with a drooping (negative) volt-ampere (V-A) curve. Saturable reactors and thyristor-controlled units are the most common. Advances in the electronics industry have readily been accepted in the welding community, resulting in sophisticated, lightweight power...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005590
EISBN: 978-1-62708-174-0
... for GTAW are usually of the constant-current type with a drooping (negative) volt-ampere curve (see the article “Power Sources for Arc Welding” in this Volume for more details on power sources in general and for inverters in particular). Saturable reactors and thyristor-controlled units are the most...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001337
EISBN: 978-1-62708-173-3
... through zero, which is important to cyclic reignition of the arc. Thyristors are employed in concert with magnetic cores to generate the square current waveform. Adjustable imbalance permits the operator to control the ratio of electrode positive (EP) to electrode negative (EN) current by dwell extension...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001363
EISBN: 978-1-62708-173-3
... in the appropriate ISO or RWMA standard. The inlet water temperature should not exceed 20 °C (70 °F), and the outlet temperature should not exceed 30 °C (85 °F). To maintain these temperature levels, the electrode cooling water supply should be independent of transformer and thyristor water cooling circuits...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003980
EISBN: 978-1-62708-185-6
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003173
EISBN: 978-1-62708-199-3
... range. Thyristors in the rectifier lower the dc voltage and provide half cycle protection. Parallel systems are most widely used. Furnace Linings Furnace linings may be acid (silica-base), neutral (alumina-base), or basic (magnesia-base), depending on the alloy being melted. Silica is usually...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005838
EISBN: 978-1-62708-167-2
... capacitors for induction heating power supplies. Courtesy of Radyne Corporation Silicon-Controlled Rectifiers (SCRs) Silicon-controlled rectifiers (SCRs) ( Fig. 5 ) have long been a staple for induction heating, and perform reliably in well-designed systems. Voltages on gate-commutated thyristors...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005895
EISBN: 978-1-62708-167-2
... tapping amounts; and on the other hand, it requires upstream drying of scrap metal for reasons of operational reliability. Induction melting was given a new impetus at the start of the 1980s with the development of the static frequency converter, which, after the introduction of thyristor technology...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005195
EISBN: 978-1-62708-187-0
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005594
EISBN: 978-1-62708-174-0
... (70 °F), and the outlet temperature should not exceed 30 °C (85 °F). To maintain these temperature levels, the electrode cooling water supply should be independent of transformer and thyristor water cooling circuits. Separate water circuits should be used for both top and bottom electrodes...