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Regulator to control current sharing among parallel-connected power transistors [electronic resource].

Published:
Los Alamos, N.M. : Los Alamos National Laboratory, 1983.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
Pages: 4 : digital, PDF file
Additional Creators:
Los Alamos National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
A current regulator is described that controls the peak current of a power transistor driving the inductive load, such as magnet coils. Presently, the current pulse has a 0.1 to 1-ms adjustable duration with duty cycle to 5%. Ultimately, the pulse length must be approx. 7 ms with 50% duty cycle. The peak current nominally is 200 A, as set by a reference pulse. Several transistors, each controlled by an individual regulator, are connected in parallel to provide the total peak load current. The regulators compensate for differences between the power transistors and assure equal current sharing among the collectors. The regulator comprises an 8-bit multiplying digital-to-analog (D/A) converter that drives the base of the power transistor, an 8-bit up-down counter, an analog differencing circuit, and a comparator. For control purposes, a current-sensing resistor in the transistor's collector produces the second input to the differencing circuit. Regulation is accomplished over a collector current range of 200 +- 50 A per stage.
Report Numbers:
E 1.99:la-ur-83-608
E 1.99: conf-830311-76
conf-830311-76
la-ur-83-608
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
01/01/1983.
"la-ur-83-608"
" conf-830311-76"
"DE83009941"
Particle accelerator conference, Santa Fe, NM, USA, 21 Mar 1983.
Higgins, E.F.; Wells, F.D.; Mauro, M.E.
Funding Information:
W-7405-ENG-36
View MARC record | catkey: 14118143