Switching device with a power FET and an inductive load

Details Switching device with a power FET and an inductive load Switching device with a power FET and an inductive load

1997-05-13

1999-08-10

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327427, 327379, H03K 1716

Patent

active

059364394

ABSTRACT:
A switching device with a power FET for switching an inductive load to which a free-wheeling diode is connected in parallel, wherein the terminal of the series resistor facing away from the gate terminal is connected to a driver circuit which is so designed that it connects the specified terminal with a reverse potential in order to block the FET, wherein, at the beginning of the process of making the FET conductive, it connects the specified terminal with a high resistance to a control voltage source that puts the FET into the conductive state, in such a way that the current rise of the current flowing through the FET is slowed down to such an extent that, within a period of time in which the free-wheeling diode is not yet blocking after starting to make the FET conductive, an increase of the current to undesirable high values is prevented, so that damage to the power FET and the free-wheeling diode and/or other circuit elements and/or the occurrence of electromagnetic disturbances is reduced, and wherein, after the point of time at which the free-wheeling diode has achieved its blocking capability, the specified terminal is connected by the driver circuit with low resistance to a control voltage source which puts the FET into the fully conductive state such that the rate of current rise is increased. Advantages are that electromagnetic disturbances can easily be reduced and that the free-wheeling diode does not have to be selected for short reverse recovery time.

REFERENCES:
patent: 4928220 (1990-05-01), White
patent: 5157351 (1992-10-01), Carbolante
patent: 5298797 (1994-03-01), Redl
patent: 5506539 (1996-04-01), Kelly et al.
patent: 5663667 (1997-09-01), Blum et al.

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