Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Patent
1997-09-24
1999-05-18
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
327365, 327419, H03B1/00
Patent
active
059053909
ABSTRACT:
An inductive load drive circuit includes a transistor for pulling-in an excitation current having a predetermined polarity and generated by an inductive load. The transistor is turned-on by a first idling loop when a drive voltage of the inductive load has a negative polarity, and the transistor is turned-on by a second idling loop when the drive voltage has a positive polarity. Though both of the first idling loop and the second idling operate on the basis of the drive voltage, in pulling the excitation current into the circuit, the drive voltage reaches a lower limit of a dynamic range at a time that the first idling loop is suitably operated while the drive voltage reaches an upper limit of the dynamic range at a time that the second idling loop is suitably operated.
REFERENCES:
patent: 4962346 (1990-10-01), Maggioni et al.
patent: 5631588 (1997-05-01), Bertolini
Callahan Timothy P.
Rohm & Co., Ltd.
Zweizig Jeffrey
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