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constant-current power sources

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290023
EISBN: 978-1-62708-306-5
... rate, thus maintaining the desired arc length. The second method of arc regulation uses a constant-current power source and a variable-speed, voltage-sensing electrode feeder. In this case, as the arc length changes, there is a corresponding change in the voltage across the arc. As this voltage change...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220047
EISBN: 978-1-62708-341-6
... (constant-current) inverter. From J. Davies and P. Simpson, Induction Heating Handbook , McGraw-Hill, Ltd., London, 1979 ( Ref 1 ) Because solid-state inverters were initially designed to replace motor-generators, the power ratings of these systems were based on standard motor-generator rating...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220027
EISBN: 978-1-62708-341-6
... at the power source as close to unity as possible. The power factor may also be defined as the cosine of the phase angle between the current and voltage in an electrical circuit. For a tuned series circuit containing an inductor, a capacitor, and a resistor, which appears to consist of a pure resistance...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110196
EISBN: 978-1-62708-247-1
..., and to a lesser extent, polysilicon elements and highly doped substrate areas. The laser modifies the electrical properties of the heated medium, namely its resistivity. This change of resistivity alters the current when using a constant voltage source, or the voltage when using a constant current source...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050025
EISBN: 978-1-62708-311-9
... power supply basic diagram. ac: alternating current; dc: direct current. Source: Ref 2 Solid-State Power Supplies Solid-state power supplies convert the line alternating voltage (ac) to produce single-phase, direct-current (dc) voltage. Inversion is then accomplished through use...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900089
EISBN: 978-1-62708-350-8
... of the port is usually about 15 times faster. Why pulse the power input? With a constant voltage input, there is a constant heat output. Reducing voltages to reduce temperature changes the current density and the cathode fall voltage distance (glow seam); therefore, other parameters also must be changed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220077
EISBN: 978-1-62708-341-6
... into the cooler, and the tap water becomes similar to distilled water. Typical cooling-water specification for an induction heating power supply Table 5.1 Typical cooling-water specification for an induction heating power supply Source: American Induction Heating Corp. Minimum pressure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220009
EISBN: 978-1-62708-341-6
... for determination of power requirements for a given application. eddy-current distribution induction heating induction-coil resistance power requirements An induction heating system consists of a source of alternating current (ac), an induction coil, and the workpiece to be heated. The basic phenomena...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220143
EISBN: 978-1-62708-341-6
...) and potential (PT) transformers to obtain induction heating “signatures” for systems utilizing (a) a constant-current (solid-state) power supply and (b) a constant-voltage (motor-generator) power supply. From G. Mordwinkin, A. L. Vaughn, and P. Hassell, Heat Treating, Vol 18, No. 11, November, 1986, p 34 ( Ref...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.t59380085
EISBN: 978-1-62708-456-7
... produced by laser surface melting and alloying can exhibit improved electrochemical behavior. Fig. 5.8 Interaction times and power densities necessary for various laser surface modification processes. Source: Ref 4 Laser transformation hardening produces thin surface zones that are rapidly...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030180
EISBN: 978-1-62708-282-2
.... Cathodic Protection Cathodic protection is based on using electrochemistry to slow or stifle the corrosion reaction. Direct currents (dc) generated by galvanic metallic couples or external power sources flow in such a direction as to shift the potential of the cathode to a value at which the corrosion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110613
EISBN: 978-1-62708-247-1
... generated free carriers exist in the p -well and the transistor is in the off-state . Effectively, no drain current exists even when a voltage is across the drain-source. Fig. 1 n -channel transistor cross section. When V G is much larger than the drain ( V D ) source ( V S...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910407
EISBN: 978-1-62708-250-1
... as anodes. Instead of corrosion of the anodes, some other oxidation reaction, that is, oxygen or chlorine evaluation, occurs at the anodes, and the anodes are not consumed. The most common source of electricity for impressed-current systems is a local power utility. Power normally involves the dc...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050263
EISBN: 978-1-62708-311-9
... voltage, or constant current. However, particularly if tuned and operating at full output power, not all power supplies will produce constant output over severe line voltage fluctuations. If the output power is not constant for a given heat cycle time, the part being heated will not heat to the same...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780164
EISBN: 978-1-62708-281-5
...–4.5 Source: Ref 1 The comprehensive test method for determining dielectric constant, dissipation factor, loss index, power factor, phase angle, and loss angle of solid electrical insulating materials developed and published by ASTM Committee D-9 is ASTM D 150 ( Ref 5 ). This standard test...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110279
EISBN: 978-1-62708-247-1
... source to drain regions. The applied gate bias acts to lower the barrier to enable current flow source to drain. As the channel gets shorter, a large Vd widens the drain depletion region to a point that reduces the potential barrier causing current flow even for zero gate bias. This effect is called...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110111
EISBN: 978-1-62708-247-1
... is at a localized maximum in a narrow short between two larger conductors; a rapid decrease in current density where a strong narrow path quickly disperse into, for example, a ground place; and a long path with relatively constant current density where the shorted path is approximately the same width as the source...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2023
DOI: 10.31399/asm.tb.edfatr.t56090091
EISBN: 978-1-62708-462-8
... PowerVia) first appearing at their 2 nm node, designated as 20A. Source: https://www.intel.com/content/www/us/en/silicon-innovations/6-pillars/process.html Fig. 2 (a) Flip-chip versus (b) buried power rail (BPR) with backside power delivery (BPD) architecture. Blockage on both sides...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900071
EISBN: 978-1-62708-350-8
.... On leaving the room, the light is switched off. The peak voltage from the power source is constant, but the duration of the power to the light is variable. Pulsed dc power supplies have the ability to switch the power on and off as required by component geometry. The pulsed dc peak voltage can be varied...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240303
EISBN: 978-1-62708-251-8
.... All the free electrons should accelerate as long as the electric field is applied, which would give rise to a continuously increasing electric current with time. However, a current reaches a constant value the instant that a field is applied, indicating that there exists what may be termed frictional...