PWM signal demodulation method and apparatus

Details PWM signal demodulation method and apparatus PWM signal demodulation method and apparatus

1991-01-10

1992-08-18

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324617, 329312, 341 53, 377 20, H03K 908

Patent

active

051402564

ABSTRACT:
A PWM signal demodulation method measuring the leading edge period of a modulated signal and a time between adjoining leading and trailing edges of the signal and finding the modulation factor in terms of the ratio of the period to the time. Reliable demodulation is ensured even if the carrier frequency of the modulated signal varies significantly. This novel method eliminates one disadvantage of the prior art demodulation method encountered when a varying carrier frequency exceeds the linearity domain of an integrator in its integrating characteristic, causing unreliable demodulation.

REFERENCES:
patent: 3179882 (1965-04-01), Clear
patent: 4408166 (1983-10-01), Moeller

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