Evaluation of Trends in Optimal Design of Pulse Transformers for Long Pulse High Power Applications
(2019) 2018 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2018 In 2018 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2018 p.31-36- Abstract
Solid state klystron modulators are typically based on oil-immersed pulse transformers due to their high performance, robustness, simplicity and straightforward design. However, the size of such transformers are highly impacted by pulse power, output voltage, pulse length, and required rise time; key parameters which are difficult to combine in long pulse high power linac applications. In this paper, pulse transformer design models for two winding configurations (single layer winding and pancake winding), including calculation of parasitic elements, are developed and validated in a 3D finite element analysis environment. These models are then employed in a global optimal design procedure used to study the evolution of pulse transformer... (More)
Solid state klystron modulators are typically based on oil-immersed pulse transformers due to their high performance, robustness, simplicity and straightforward design. However, the size of such transformers are highly impacted by pulse power, output voltage, pulse length, and required rise time; key parameters which are difficult to combine in long pulse high power linac applications. In this paper, pulse transformer design models for two winding configurations (single layer winding and pancake winding), including calculation of parasitic elements, are developed and validated in a 3D finite element analysis environment. These models are then employed in a global optimal design procedure used to study the evolution of pulse transformer volume as pulse length is increased from 500 μs to 4 ms while constraining maximum pulse rise time and overshoot. The impact of required pulse power, pulse rise time, and system size is also studied. The single layer winding based on standard enameled round wire is first investigated under size constraints representing a limit imposed by manufacturability and maintainability, validating the optimization procedure and demonstrating that, for this winding technique, sub-optimal rise time and therefore transformer size is attained for long pulse high power applications. Consequently, the pancake winding configuration is evaluated under the same conditions, demonstrating that, although more complex and costly, its flexibility allows a more compact design. Finally, a pulse transformer rated for pulse amplitude 115 kV, output current 25 A, pulse length 2.8 ms, and 0-99% rise time <300 μs is designed, demonstrating the design procedure and showcasing limitations experienced in design. Its performance is assessed in circuit simulation whereas the validity of the derived parameters is demonstrated through finite element analysis.
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- author
- Collins, Max LU and Martins, Carlos A. LU
- organization
- publishing date
- 2019-12-19
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- Accelerator power supplies, high voltage techniques, pulse generation, pulse power systems
- host publication
- 2018 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2018
- series title
- 2018 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2018
- article number
- 8936840
- pages
- 6 pages
- publisher
- IEEE - Institute of Electrical and Electronics Engineers Inc.
- conference name
- 2018 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2018
- conference location
- Jackson, United States
- conference dates
- 2018-06-03 - 2018-06-07
- external identifiers
-
- scopus:85077821023
- ISSN
- 2576-7283
- 1930-885X
- ISBN
- 9781538654538
- 978-1-5386-5454-5
- DOI
- 10.1109/IPMHVC.2018.8936840
- language
- English
- LU publication?
- yes
- id
- 8818fbe3-e640-47c4-a3dc-faf03f9d2ca4
- date added to LUP
- 2020-01-22 16:55:57
- date last changed
- 2024-06-26 10:13:26
@inproceedings{8818fbe3-e640-47c4-a3dc-faf03f9d2ca4,
abstract = {{<p>Solid state klystron modulators are typically based on oil-immersed pulse transformers due to their high performance, robustness, simplicity and straightforward design. However, the size of such transformers are highly impacted by pulse power, output voltage, pulse length, and required rise time; key parameters which are difficult to combine in long pulse high power linac applications. In this paper, pulse transformer design models for two winding configurations (single layer winding and pancake winding), including calculation of parasitic elements, are developed and validated in a 3D finite element analysis environment. These models are then employed in a global optimal design procedure used to study the evolution of pulse transformer volume as pulse length is increased from 500 μs to 4 ms while constraining maximum pulse rise time and overshoot. The impact of required pulse power, pulse rise time, and system size is also studied. The single layer winding based on standard enameled round wire is first investigated under size constraints representing a limit imposed by manufacturability and maintainability, validating the optimization procedure and demonstrating that, for this winding technique, sub-optimal rise time and therefore transformer size is attained for long pulse high power applications. Consequently, the pancake winding configuration is evaluated under the same conditions, demonstrating that, although more complex and costly, its flexibility allows a more compact design. Finally, a pulse transformer rated for pulse amplitude 115 kV, output current 25 A, pulse length 2.8 ms, and 0-99% rise time <300 μs is designed, demonstrating the design procedure and showcasing limitations experienced in design. Its performance is assessed in circuit simulation whereas the validity of the derived parameters is demonstrated through finite element analysis.</p>}},
author = {{Collins, Max and Martins, Carlos A.}},
booktitle = {{2018 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2018}},
isbn = {{9781538654538}},
issn = {{2576-7283}},
keywords = {{Accelerator power supplies; high voltage techniques; pulse generation; pulse power systems}},
language = {{eng}},
month = {{12}},
pages = {{31--36}},
publisher = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
series = {{2018 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2018}},
title = {{Evaluation of Trends in Optimal Design of Pulse Transformers for Long Pulse High Power Applications}},
url = {{http://dx.doi.org/10.1109/IPMHVC.2018.8936840}},
doi = {{10.1109/IPMHVC.2018.8936840}},
year = {{2019}},
}