Patent
Distortion factor meter circuit
Nobuo Terui,Kozo Kobayashi +1 more
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TLDR
In this paper, a distortion factor meter circuit adapted to measure a harmonic distortion factor of a signal, particularly, is presented, where a first transmission line is provided which is adapted to shape a first signal having a harmonic component to produce a DC signal, to convert the DC signal into a square wave having a width proportional to the level of the input DC signal and a predetermined periodicity.Abstract:
This invention relates to a distortion factor meter circuit adapted to measure a harmonic distortion factor of a signal, particularly. A first transmission line is provided which is adapted to shape a first signal having a harmonic component to produce a DC signal, to convert the DC signal into a square wave having a width proportional to the level of the input DC signal and a predetermined periodicity, and thereafter to produce a triangular wave signal having a level linearly increasing from a zero level during the existence of the level of the input square wave signal and linearly decreasing immediately after the level of the square wave signal disappears. A second transmission line is also provided which is adapted to produce a second signal having a residual harmonic component left by eliminating a fundamental from the first signal. Further, a voltage comparator is provided which serves to produce a digital signal of "1" when the level of the output signal from the first transmission line is lower than that from the second transmission line, and to produce a digital signal of "0" when the level of the output signal from the first transmission line is higher than that from the second transmission line. Finally, an integration circuit is provided which serves to integrate the output signal from the voltage comparator.read more
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References
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