JPS54123843A - Drive unit for rotating magnetic field - Google Patents

Drive unit for rotating magnetic field

Info

Publication number
JPS54123843A
JPS54123843A JP3133378A JP3133378A JPS54123843A JP S54123843 A JPS54123843 A JP S54123843A JP 3133378 A JP3133378 A JP 3133378A JP 3133378 A JP3133378 A JP 3133378A JP S54123843 A JPS54123843 A JP S54123843A
Authority
JP
Japan
Prior art keywords
current
switch
stopping
turned
drive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3133378A
Other languages
Japanese (ja)
Inventor
Tsunesuke Takahashi
Yoshifusa Wada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP3133378A priority Critical patent/JPS54123843A/en
Publication of JPS54123843A publication Critical patent/JPS54123843A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To enable to dissolve the deficiency causing under-shoot easily, the turning off the positive current switch faster than the negative current switch, at the stopping of drive current.
CONSTITUTION: The positive current switch 16 and the negative current switch 17 are connected to the first terminal 12 of the drive coil 17 and the exciting current drive circuit 14 and the resonant capacitor 15 are connected to the second terminal 13 so that the switch 16 is turned off faster than the switch 17 at the stopping of the drive current I. Further, when the switch 17 is turned off at the stopping of the current I41, although the voltage Vs42 rapidly increases from 0 to the positive maximum value, since the npn transistor of the switch 16 is held lower for the base potential, it is not turned on and no leakage current is caused. That is, the bubble in a magnetic bubble chip can be stopped at a suitable position, and thus the undershoot of the current I can be prevented with low cost circuit constitution.
COPYRIGHT: (C)1979,JPO&Japio
JP3133378A 1978-03-17 1978-03-17 Drive unit for rotating magnetic field Pending JPS54123843A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3133378A JPS54123843A (en) 1978-03-17 1978-03-17 Drive unit for rotating magnetic field

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3133378A JPS54123843A (en) 1978-03-17 1978-03-17 Drive unit for rotating magnetic field

Publications (1)

Publication Number Publication Date
JPS54123843A true JPS54123843A (en) 1979-09-26

Family

ID=12328319

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3133378A Pending JPS54123843A (en) 1978-03-17 1978-03-17 Drive unit for rotating magnetic field

Country Status (1)

Country Link
JP (1) JPS54123843A (en)

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