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low-frequency power supplies

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Published: 30 September 2014
Fig. 12 Power supply output at resonant frequency. SP, set point; LF, low frequency; HF, high frequency. Source: Ref 9 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: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005838
EISBN: 978-1-62708-167-2
... into the megawatts. Because IGBTs have relatively low losses and are indexpensive to manufacture, they are the most common device used in power supplies today. The MOSFETs have higher losses and more expensive than IGBTs, so they are used only when a high operating frequency is required. Power switching device...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005924
EISBN: 978-1-62708-166-5
... and development of induction heat treating practices continued to grow after World War II, and output transformers were developed to help the power supplies and load match when using low-turn work coils. From the 1940s through the 1950s, the use and application of large motor generators and radio-frequency (RF...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005843
EISBN: 978-1-62708-167-2
... of components, and testing the setup. frequency induction coils inductors load matching power supplies power supply circuit transformers TRANSFORMERS AND REACTORS for induction heating are discussed in the first half of this article as well as the following topics: initial considerations...
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
... is expensive for low-power ratings. It nevertheless can be expected that insulated-gate bipolar transistor (IGBT) converter technology will offer solutions able to be implemented in the foreseeable future. In the case of line frequency power supply, channel furnaces are connected to the mains network via...
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
... constant-voltage power sources electron beam welding frequency modulation power sources pulse width modulation resistance welding POWER SOURCES are apparatuses that are used to supply current and voltages that are suitable for particular welding processes. This article describes power sources...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005834
EISBN: 978-1-62708-167-2
.... It was not until the late 1960s that motor-generators were replaced by solid-state converters for frequencies now considered to be in the medium-frequency rather than the high-frequency range. (Modern induction power supplies are classified as low frequency (less than approximately 1 kHz), medium frequency (1...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005196
EISBN: 978-1-62708-187-0
..., medium-frequency power supplies. The advantage of medium frequency is that the power density of the furnace system can be increased substantially without increasing its size. Much more melting power can be applied, while maintaining the stirring action at desirable levels. Heat losses, which...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001400
EISBN: 978-1-62708-173-3
... current in the coil (i.e., the workpiece and the coil form an inductance-capacitance-resistance circuit with the power supply). Coupling Efficiency The coupling efficiency is optimized over a narrow range of operating parameters (frequency, coil turns, coil proximity, etc.) per the given workpiece...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005902
EISBN: 978-1-62708-167-2
... Supply In the case of line-frequency power supply, channel inductor furnaces are connected to the mains network via a low-voltage or high-voltage tap transformer ( Fig. 17 ). In a low-voltage connection, three of several transformer stages are conducted to heavy-duty contactors that switch...