Circuit and method for monitoring a pulse width modulated wavefo

Details Circuit and method for monitoring a pulse width modulated wavefo Circuit and method for monitoring a pulse width modulated wavefo

1991-08-14

1993-06-29

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307265, 3281291, 328 61, 377 39, H03K 522, H03K 3017

Patent

active

052237427

ABSTRACT:
A pulse width modulated waveform measurement circuit is provided with a detector for detecting logic level transitions in a pulse width modulated waveform during a measurement interval, a counter for counting clock pulses, and a gate circuit for enabling the counter during a time period corresponding to the width of a preselected pulse in the pulse width modulated waveform. A comparison circuit is provided for comparing the output count from the counter with a predetermined count and for comparing the number of logic level transitions detected during the measurement interval with a predetermined number to obtain an indication of the operational status of the pulse width modulated waveform. In an alternative embodiment, the gate circuit enables the counter during time periods corresponding to the widths of successive pulses in the pulse width modulated waveform. Successive output counts are stored in real time and compared to successive predetermined counts to obtain an indication of the operational status of the pulse width modulated waveform. The polarity of the pulse width modulated waveform is also monitored to provide an additional indication of the operational status of the waveform.

REFERENCES:
patent: 4302665 (1981-11-01), Hoenig
patent: 4566111 (1986-01-01), Tanagawa
patent: 4675597 (1987-06-01), Hernandez
patent: 4870664 (1989-09-01), Hayashi
patent: 4870665 (1989-09-01), Vaughn
patent: 4982109 (1991-01-01), Burwell
patent: 4989223 (1991-01-01), Katayose et al.

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