Adaptive over-current detection

Details Adaptive over-current detection Adaptive over-current detection

2005-10-04

2005-10-04

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Current conversion

Including automatic or integral protection means

C361S018000, C361S087000, C361S093200, C361S094000

Reexamination Certificate

active

06952356

ABSTRACT:
Disclosed are methods and apparatus for over-current detection in PWM power stages. Disclosed methods and apparatus provide over-current detection with adaptive filtering according to the pulse width of the PWM input signal. Methods and apparatus for their implementation are described for detecting the pulse width of a PWM signal in the PWM circuit. According to the detected pulse width, a digital delay less than the pulse width of the PWM signal is selected from among a plurality of available digital delays. Further, an over-current condition in the PWM power stage is detected. The detected over-current signal is filtered by means of the selected digital delay and an over-current detection result is output.

REFERENCES:
patent: 3906258 (1975-09-01), Moe
patent: 4330816 (1982-05-01), Imazeki et al.
patent: 4839770 (1989-06-01), Ruta
patent: 6418002 (2002-07-01), Yang et al.

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