Method for detecting zero crossing time, frequency and phase difference of power sinusoidal signals
A technology of sinusoidal signal and phase difference, which is applied in the zero-crossing time of sinusoidal signal, detection of phase difference, and frequency field, which can solve the problems of difficult identification of zero-crossing point and insufficient phase resolution.
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[0040] The present invention will be described in detail below in conjunction with the drawings:
[0041] See figure 1 Suppose the input sine signal is It is well known that all sinusoidal signals can be approximately equivalent to linear signals near the zero crossing point. This is because the power series of the sine function is The value of x near the zero crossing of the sine signal is generally very small, so ignoring the higher-order term can be approximated as sinx≈x, as attached figure 1 Shown. If the relative error between the approximate formula and the true value is required to be ≤0.1%, the value range of x is x∈[-0.0774, 0.0774].
[0042] In practical problems, there are usually two types of relationships between interrelated variables: one is a deterministic relationship, which is characterized by the value of one or a group of variables that uniquely determines the value of another variable; the other A relationship is a non-deterministic relationship. Its charac...
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