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impedance matching

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Published: 01 August 2015
Fig. 3.21 Load matching/impedance matching. Source: Ref 3 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220027
EISBN: 978-1-62708-341-6
... tuned. The chapter describes these procedures, including the processes involved in tuning induction heating circuits and load matching, impedance matching by means of a transformer, and tuning used for specific types of power supplies. capacitor tuning impedance matching induction heating...
Image
Published: 01 June 1988
Fig. 4.18 Schematic circuit diagrams of a low-to-medium-frequency heat station illustrating capacitor and impedance-matching adjustments when using (a) an autotransformer for high-impedance induction coils and (b) an isolation transformer for low-impedance induction coils More
Image
Published: 01 June 1988
Fig. 4.17 Heat station for use at low and medium frequencies with an impedance-matching transformer Source: American Induction Heating Corp. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220047
EISBN: 978-1-62708-341-6
... of, and I 2 R losses in, the appropriate tank circuit, imperfect impedance matching between the power supply and the workpiece/induction coil, and transmission losses between the power supply and the induction coil. Power losses within the power supply due to conversion of line frequency to higher...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050025
EISBN: 978-1-62708-311-9
... current to high-frequency outputs. The two main types of circuits in the high-frequency output are parallel and series resonant. When the impedance of the output of the power supply (vector sum of resistance, capacitance, and inductance) matches the impedance of the load (output to work coil and workpiece...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440159
EISBN: 978-1-62708-262-4
... not needed Solid state 180 Hz to 50 kHz 1 kW to 2 MW 75–95 No standby current; high efficiency; no moving parts; needs protection outdoors; no warmup time; impedance matches changing loads Vacuum tube 50 kHz to 10 MHz 1 kW to 500 kW 50–75 Shallow heating depth; localized heating; highest cost...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220241
EISBN: 978-1-62708-341-6
... pattern. With RF systems, the same type of control can be achieved using ferrite flux concentrators. In addition, ferrites can sometimes be loaded into the core of an output-impedance-matching transformer to increase its efficiency. However, water cooling of the core material in such a high-density field...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110132
EISBN: 978-1-62708-247-1
.... They were successfully adopted to electronics industry for transmission line of printed circuit board (PCB) and interconnectors between package and PCB [1 , 2] . Fundamentally, both methods directly characterize the electrical path impedance by analyzing the received signal as a function of time...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240017
EISBN: 978-1-62708-251-8
... atom point defects. Source: Ref 1 Point defects influence solid-state processes such as diffusion, dislocation motion, phase transformations, and electrical conductivity. Point defects typically strengthen a metal and decrease its ductility by impeding the motion of dislocations. Point defects...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420339
EISBN: 978-1-62708-310-2
... in an extremely fine precipitate dispersed in the matrix, and (2) there must be a degree of lattice matching between the precipitate particles and the matrix (i.e., the precipitate must be coherent). Particle Hardening Particle hardening is a form of particle, or dispersion, hardening where extremely small...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720267
EISBN: 978-1-62708-305-8
...) the acoustic impedance of such a reflector. Energy reflected from various interfaces and flaws can be used to define the presence and locations of flaws; the thickness of the material; and, the depth of a flaw beneath a surface. Most ultrasonic inspections are performed using a frequency between 1 and 25...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110550
EISBN: 978-1-62708-247-1
... nondestructive to maintain the integrity of the sample and verify that data collected can match that of the test fail data. When a component and area of interest are identified, additional non-destructive imaging techniques, such as X-Ray imaging and CSAM (Confocal Scanning Acoustic Microscopy) can be used...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220143
EISBN: 978-1-62708-341-6
... be correlated to the temperature or heating pattern in the induction heated workpiece, such as measurement of coil impedance or of coil voltage and current. A controller for comparing the temperature of the workpiece to a preset desired temperature. A power-control device for regulating the power...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930249
EISBN: 978-1-62708-359-1
... corrosion resistance for the intended application. This usually means that the welding filler metal must at least match (and sometimes overmatch) the contents of the base metal in terms of specific alloying elements, such as chromium, nickel, and molybdenum. After corrosion resistance has been...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230189
EISBN: 978-1-62708-351-5
...-germanium alloys or, indeed, for the industry-standard gold-silicon and gold-germanium eutectics. Silicon and germanium react with oxygen when heated to form stable refractory oxides on the free surfaces, which impede wetting by these alloys. Rosin fluxes have been found to be ineffective in either...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110042
EISBN: 978-1-62708-247-1
... does. But we intuitively know that if we increase magnification we can see smaller details. Magnification is actually about matching the resolution element to the detector, whether eye or camera. Imagine an objective with N.A. appropriate for our resolution task but with no magnification (1x...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220185
EISBN: 978-1-62708-341-6
....). Low-frequency coils often have many turns. Accordingly, the coil usually forms the total tank inductance, and an autotransformer may be used to match the high coil impedance to that of the induction generator. In any case, the coil or transformer inductance must be high in order to reduce the number...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870183
EISBN: 978-1-62708-314-0
... are required, it is very important that the coefficient of thermal expansion of the tool match that of the part. For carbon fiber thermoplastics, monolithic graphite, cast ceramic, steel, and Invar 42 are normally used. Fourth, the bagging materials must be capable of withstanding the high temperatures...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110067
EISBN: 978-1-62708-247-1
... materials must be equal at the interface, the frequency remains unchanged across the interface, and the reflected and transmitted pressure amplitudes can be described as functions of the acoustic impedances, Z i , of the two materials ( Eq. 1 and 2 ). [1] P R = ( Z 2 -Z 1...