Asynchronous fault detection circuit for a PWM driver

Details Asynchronous fault detection circuit for a PWM driver Asynchronous fault detection circuit for a PWM driver

2005-04-12

2005-04-12

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S020000, C327S352000

Reexamination Certificate

active

06879189

ABSTRACT:
Fault detection circuitry is provided for a PWM driver responsive to a PWM input signal to produce a PWM output signal, and includes a first circuit producing a scaled switching signal as a scaled representation of the PWM input signal. A second circuit is configured to produce a combined switching signal as a combination of the PWM output signal and the scaled switching signal, and a third circuit is configured to convert the combined switching signal to an analog output signal indicative of one or more fault conditions associated with the PWM driver. A number of comparators may be included with each responsive to the analog output signal and to a different one of a corresponding number of different references voltages, to produce a fault signal indicative of a particular one of the one or more fault conditions.

REFERENCES:
patent: 5164659 (1992-11-01), Schultz et al.
patent: 6317458 (2001-11-01), Boggs et al.

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