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LH Research Inc.

From EverybodyWiki Bios & Wiki





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LH Research Inc.
ISIN🆔
IndustryPower Electronics
FateAcquired by International Power Systems Inc., a subsidiary of Charter Power for $3.5 million
Founded 📆April 1, 1976; 48 years ago (1976-04-01)
Tustin, California, U.S.
Founders 👔Lawrence Y. Lee,
(CEO)
Wallace N. Hersom[1],
(Vice President R&D, resigned in 1983)
DefunctFebruary 22, 1996; 28 years ago (1996-02-22)[2]
Headquarters 🏙️,
Tustin, California, U.S.
Number of locations
5: US mainland (Tustin & Irvine), Puerto Rico, Dominican Republic and Malaysia (1993)
Area served 🗺️
Key people
Peter W. Sognefest
(President and CEO, 1994-1996)[3][4]
Hal Orr,
(Chief Financial Officer and Vice President of Operations)[5]
K. Kit Sum,
(Chief Engineer)
John Petersen,
(Division Controller Caribbeans, 1983 - 1990)[6]
Chatar Singh,
(General Manager Caribbean (Puerto Rico and Dominican Republic) 1983-1991)[7]
Fernando Barreto,
(QA Manager)
Frank Campion,
(Supervisor of Development Support)
Products 📟 Switched-mode power supplies
BrandsTeeny-Tiny-MITE, Tiny-MITE, Mighty-MITE, LH-Series and more
Revenue🤑 US$25-50 million[8] (1984)
Members
Number of employees
🌐 Website[Lua error in Module:WikidataIB at line 665: attempt to index field 'wikibase' (a nil value). ] 
📇 Address
📞 telephone

LH Research Inc. (abbr. LHR) was an American manufacturer of switched-mode power supplies ("SMPS"), founded in 1976 by medical doctor[9] Lawrence Lee and Wally Hersom (Bachelor of Music CSULB[10]). With over 1000 employees in the US,[11] Latin America[12] and Southeast Asia,[13] LHR was the world's largest manufacturer of switching regulated power supplies from 1984 to 1987.[14][15] The company had sales offices in Europe,[16] Asia and Texas, as well as in other American and international locations, each with up to five employees.

History[edit]

Thanks to the work of Robert Boschert,[17] switched mode power supplies were a revolutionary technology that quickly replaced the linear ones. This became mainly possible due to the new availability of high voltage, high speed and high power transistors at a low cost in the mid seventies.[18]

In 1975, Wally Hersom developed his own switcher design.[19][20] Hersom's design was a full-bridge-converter, which became the base for the first of LHR's products. The company, being at that time the first "SMPS-only" firm, then specialized in the development and manufacturing of switching power supplies for minicomputers, and mainframes.

Hersom left LH Research in 1983. In 1984 he started a new company, HC Power. In 2000, Hersom sold HC Power to Power One, Inc. He retired as president of Power One's telecommunications division in 2001.

Foundation stone laid for the Irvine factory, February 1980.

Fields of application[edit]

The most notable use of an LH Research power supply was the "Mighty-MITE MM 72, 375-Watt" supply in the Xerox Alto Computer. Furthermore LHR power supplies have been installed in many Silicon Graphics computer models, for example in the 1988 "Professional IRIS" workstation. Also notable is the use of three 1000 watts "Super-MITE SM 11" supplies in the Convex C1 Vector Minisupercomputer.[21]

Further use of LHR-power supplies were process controllers, medical devices, satellite communication systems, test and transmission equipment and video display systems.[22]

Opened "Mighty-MITE-A" 1000W power supply

Decline[edit]

LH Research was specialized in producing low voltage, high-current power supplies specifically aimed at the minicomputer market with its predominant use of Transistor–transistor logic-chips. When this class of computers disappeared in favour of CMOS-technology based PCs and servers,[23] the company lost a big part of its customer base. Although LHR did expand its range of power supplies to the emerging PC-market in the early 1990's, it faced rapidly growing domestic and foreign competition. Subsequently LHR was acquired in 1996 by Charter Power Systems,[24] which renamed itself in June 1997 to C&D Technologies.[25] The company Pioneer Magnetics in New Jersey offers a supply of replacement power supplies.

Headquarter on 14402 Franklin Ave in Tustin (torn down in 2009)

Industrial and scientific influence[edit]

LHR's commercial success has made Orange County, California a magnet for the switching power supply industry. Many of the power electronics companies which have been founded in this area are still active today. These include Magnetic Design Labs, Inc., TESLAco, 3Y Power Technology, Inc. (now part of the FSP Group), B&K Precision Corp, IntelliPower Inc., Interact Power, Inc. and many more.

The power supply industry had a growing demand of specialized components, and therefore attracted many electronics manufacturing services. Some of the first SMPS control ICs were designed (literally taped-up on mylar) in Orange County at Silicon General (acquired by Microsemi in 1999).[citation needed]

R. D. Middlebrook is considered to be one of the founding fathers of power electronics. One of his specialities was the control theory of switched-mode power supplies, and his lectures attracted many engineering students to the California Institute of Technology. Even today, Middlebrook's leading research is continued by some of his former students: Keyue Smedley,[26] Director of the Department of Electrical Engineering and Computer Science at the University of California, Irvine, leads a working group at her Power Electronics Laboratory. Slobodan Ćuk was Professor of electrical engineering at the California Institute of Technology for 23 years.[27] He conducts research in electronic energy processing systems and teaches courses in power electronics. One of his most famous inventions was the Cuk converter. His company TESLAco developed jointly with Honeywell hybrid Cuk converter modules for NASA's ORION spacecraft.

de:LH Research

Further reading[edit]

References[edit]

  1. ↑ "Regarding the possible trend toward higher switching frequencies". Electronic products magazine & clip file. Vol. 23. Hempstead, N.Y.: Tech Publishers. 1980. OCLC 10400141. Retrieved 25 April 2022.
  2. ↑ "IPS acquired LH Research, Inc". Moody's industrial manual. New York, N.Y.: Moody's Investors Service. 1997. p. 2862. ISSN 0545-0217. Retrieved 25 April 2022.
  3. ↑ "Alumni Award For Distinguished Service". University of Illinois at Urbana-Champaign, The Grainger College of Engineering. Retrieved 27 April 2022. In March 1994, he was appointed president and chief executive officer of LH Research, Inc. LH Research is a leading manufacturer of power supplies to the instrument, computer, copier, and capital equipment industries.
  4. ↑ "EXISTING CLASS TWO DIRECTORS WHOSE TERMS EXPIRE IN 2016". United States Securities and Exchange Commission. 2015. Retrieved 27 April 2022. He was President and Chief Executive Officer of LH Research, Inc. from 1994 to 1996
  5. ↑ Heald, Beck Ellman (Aug 30, 2011). "The San Diego Foundation names Hal Orr As Chief Financial & Investment Officer". Patch Media. Additionally, Orr served as Chief Financial Officer and Vice President of Operations at LH Research, Inc. in Costa Mesa, a privately owned $40 million designer, manufacturer, and distributor of AC/DC switching power supplies with more than 1,000 employees and serving a worldwide market. His responsibilities included accounting, MIS, manufacturing, purchasing, test engineering, and forecast and master scheduling for foreign and US locations.
  6. ↑ Lezynski, Steve (Nov 29, 2017). "Build, Buy or Borrow? Driving Growth through Assets, Acquisitions & Alliances". AchieveNEXT. John Petersen, Corporate Controller - LH Research Inc 1983 - 1990
  7. ↑ "Change in Boardroom". ChartNexus - Investor Relations. 30 June 2011. Retrieved 27 April 2022. In 1983, he joined LH Research, an American switching power supply company based in Prai, Penang and HQ in California, in the U.S. He was with LH Research for a total of 9 years and was also responsible for managing LH Research factories in the Caribbean (Puerto Rico and Dominican Republic) for approximately 3 years as General Manager.
  8. ↑ "Top merchant suppliers to U.S. market - Switching Power Supplies (Ranked by 1983 sales)". Electronic Business. Vol. 10 no. 4–7. Boston, MA: Cahners Publishing Company. 1984. pp. 24, 124. ISSN 0163-6197. OCLC 3523180. Retrieved 26 April 2022.
  9. ↑ "Beginning with nothing in the way of experience". Asian American identity Jade magazine. Vol. 4–5. Los Angeles: Jade Publications. 1981. p. 12. ISSN 0147-8230. Retrieved 25 April 2022.
  10. ↑ "Reliable sources: Power supplies feature quality". Electronic business. Vol. 10. Boston, MA: Cahners Pub. Co. 1984. p. 124. ISSN 0163-6197. OCLC 3523180. Retrieved 25 April 2022.
  11. ↑ "LH Research Constructing Tustin Plant". The Tustin News. Tustin, California. July 27, 1978. p. 6. Retrieved 25 April 2022.
  12. ↑ "Puerto Rico Directory of Manufacturers". Directory of Manufacturers. Puerto Rico: Economic Development Administration. Office of Economic Research. 1989. p. 185. OCLC 13849215. Retrieved 26 April 2022.
  13. ↑ "A Business Times-MIDA directory". Malaysia, electronics & electrical industries. Kuala Lumpur: Business Times (Firm); Lembaga Kemajuan Perindustrian Malaysia. March 1993. p. 195. OCLC 31943857. Retrieved 27 April 2022.
  14. ↑ "Today, LH Research is the world's largest dedicated manufacturer of regulated switching power supplies". Electronic design. Vol. 35. New York, N.Y.: Hayden Pub. Co. 1987. p. 186. ISSN 0013-4872. Retrieved 25 April 2022.
  15. ↑ "The World's Largest Manufacturer of Switching Regulated Power Supplies". Digital Design. Vol. 14. Boston: Benwill Publishing Corporation. 1984. p. 73. ISSN 0147-9245. Retrieved 25 April 2022.
  16. ↑ Blauvelt, Euan; Durlacher, Jennifer (1982). World Sources of Market Information: Europe. London: Grindlays Bank Limited. Economics Dept. p. 333. ISBN 9780884108634. Search this book on
  17. ↑ Kilbane, Doris (2009-12-07). "Robert Boschert: A Man Of Many Hats Changes The World Of Power Supplies". Electronic Design. Retrieved 2019-09-12.
  18. ↑ Shirriff, Ken (August 2019). "The Quiet Remaking of Computer Power Supplies: A Half Century Ago Better Transistors And Switching Regulators Revolutionized The Design Of Computer Power Supplies". IEEE Spectrum. Retrieved 2019-09-12.
  19. ↑ W. Hersom (March 1975). "Optimizing the High Current Transistor Converter". Solid State Power Conversion. Vol. 1. Retrieved 26 April 2022.
  20. ↑ US exspired 4292665, Wallace N. Hersom, Tustin; John E. Crum, Mission Viejo, both of Calif., "OUTPUT STAGE FOR SWITCHING REGULATED POWER SUPPLY", published 1981-09-29, assigned to LH Research, Tustin, Calif. 
  21. ↑ "Convex C1 Power Supply Replacement". Retrieved 2022-04-15.
  22. ↑ "SWITCHING SUPPLY". Digital Design. Boston: Benwill Publishing Corporation. 1980. p. 1. ISSN 0147-9245. Retrieved 28 April 2022.
  23. ↑ Bell, Gordon (April 2014). "STARS: Rise and Fall of Minicomputers [Scanning Our Past]". Proceedings of the IEEE. 102 (4): 635. doi:10.1109/JPROC.2014.2306257. ISSN 0018-9219. Retrieved 2022-04-26. Unknown parameter |s2cid= ignored (help)
  24. ↑ "Costa Mesa's LH Research Acquired, L.A. TIMES ARCHIVES FEB. 24, 1996". Los Angeles Times. 24 February 1996. Retrieved 2022-04-15.
  25. ↑ "Charter Power renames itself C&D Technologies". American City Business Journals. 1997-06-30. Retrieved 2022-05-06.
  26. ↑ "Keyue Smedley, Professor Electrical Engineering and Computer Science at Samueli School of Engineering, University of California, Irvine". Retrieved 2022-05-18.
  27. ↑ "IEEE Xplore: Slobodan Ćuk". Retrieved 2022-05-20.

External links[edit]



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