Prediction methods and circuits for operating a transistor as a

Details Prediction methods and circuits for operating a transistor as a Prediction methods and circuits for operating a transistor as a

1998-03-13

2000-04-25

Sterrett, Jeffrey

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363127, H02M 7217

Patent

active

060551704

ABSTRACT:
Circuits and methods are provided for operating a transistor as rectifier based upon the detected Vds of the transistor. In sensing the Vds voltage of the SRMOS, during positive conduction, the SRMOS body diode will conduct and the Vds of the SRMOS becomes that of a forward body diode voltage, which may, depending on the type of the device, be approximately -0.6V. If this voltage level is sensed, it may indicates that the SRMOS is turned off too early. During reverse conduction, Vds is non-existent (which is similar to a diode). In this case, the SRMOS may be turned off too late. Thus, by examining Vds, the SRMOS can be operated in such a manner so that it is turned off at an optimal point in time.

REFERENCES:
patent: 4870555 (1989-09-01), White
patent: 5424932 (1995-06-01), Inou et al.
patent: 5430640 (1995-07-01), Lee
patent: 5523940 (1996-06-01), Wymelenberg
patent: 5528480 (1996-06-01), Kikinis et al.
patent: 5742491 (1998-04-01), Bowman et al.

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