METHOD FOR DETERMINING PHASE ANGLE BETWEEN TWO SINUSOIDAL SIGNALS (VERSIONS) Russian patent published in 2015 - IPC G01R19/00 

FIELD: electricity.

SUBSTANCE: method for determining phase angle between two sinusoidal signals by measuring, recording and digitalizing of instantaneous values a(t_j) of signals a(t) = A_msin(ωt+φ_a) and b(t) = B_m·sin(ωt+φ_b) at the same moments of time t_j = t₁, t₂, …, t_N, where N is number of measurements within period T. At that t_j+1 = t_j+Δt, where Δt = T/N is discretization interval of the signal in time. At that at each measurement of signals a(t) and b(t) values of signals received two intervals back a(t_j-2Δt), b(t_j-2Δt), j = 3, 4, …, N+2 are selected, the current value R_j = a(t_j-2Δt)-a(t_j) of signal a(t) is calculated and recorded, the current value S_j = b(t_j-2Δt)+b(t_j) of signal b(t) is calculated and recorded, while the value φ_ab of angle difference between signals a(t) and b(t) are defined upon measurement, recording and digitalization of all N instantaneous values as per the following mathematical expression φ_ab = arqsin(ΣR_jS_j/(4πA_mB_m)), where summing is made as per j = 3, …, N+2, R_j = a(t_j-2Δt)-a(t_j); S_j = b(t_j-2Δt)+b(t_j).

EFFECT: simplified method for defining angle difference.

2 cl, 3 tbl