Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Patent
1996-08-23
1999-01-19
Nelms, David C.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
327110, 123490, 361154, H03K 300, F02M 5100, H01H 900
Patent
active
RE0360465
ABSTRACT:
second current recirculating branch alternately connectable parallel to the load, for reducing the current in the same; and a logic control unit for opening and closing the switch and recirculating branches, so that the load is supplied with a current rising to a peak value and then falling rapidly to and oscillating about a lower hold value; a transistor being provided for reducing the voltage supplied to the load by the first recirculating branch at the end of the fast fall phase, so as to eliminate uncontrollable operating zones and prevent the load current from falling below the hold value..!.
A device for driving an inductive load such as a fuel injector includes a drive switch and a voltage regulator that are coupled to the inductive load. The device also includes a control circuit that is coupled to the voltage regulator, the drive switch, and the inductive load. The control circuit receives a drive signal and in response to the drive signal controls the voltage regulator and the drive switch. Initially, the switch closes and draws a charge current through the inductive load. When the charge current reaches a peak level, the switch opens to allow a discharge current to flow through the inductive load. The voltage regulator regulates the discharge voltage across the inductive load such that the discharge current falls at a first rate. When the discharge current reaches a first value, the voltage regulator regulates the discharge voltage across the inductive load so as to decrease the rate at which the discharge current falls. When the discharge reaches a second value, the control circuit controls the drive switch to generate a hold current through the inductive load.
REFERENCES:
patent: 4238813 (1980-12-01), Carp et al.
patent: 4292948 (1981-10-01), Graessley
patent: 4327394 (1982-04-01), Harper
patent: 4358812 (1982-11-01), LoCascio et al.
patent: 4612597 (1986-09-01), Hamren
patent: 5072141 (1991-12-01), Eisenbart et al.
Brambilla Massimiliano
Maggioni Giampietro
Carlson David V.
Nelms David C.
Phan Trong
Santarelli Bryan A.
SGS-Thomson Microelectronics S.R.L.
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