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STPM32 数据表(PDF) 84 Page - STMicroelectronics |
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STPM32 数据表(HTML) 84 Page - STMicroelectronics |
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84 / 121 page  Application design and calibration STPM32, STPM33, STPM34 84/121 DS10272 Rev 8 Figure 53. Phase shift error The θ angle can be measured through the error on active power (from LED) averaged over a certain number of samples (for example 50) at power factor PF = 0,5. For example, if the error = e, the phase shift between voltage and current is: Equation 28 To compensate this error, PHC and PHV bits must be set as below, to introduce a correction factor φ = -θ. Table 40. Phase compensation Parameter Value φ ≥ 0 PHVx = 0x0 PHVx = 0x1 PHCx[9] = 0x0 PHVx = 0x2 PHCx[9] = 0 PHVx = 0x3 PHCx[9] = 0 ar 1e + 2 ------------- 60 – cos = fline SCLK ---------------- – 2 9 360 0 PHCx 8:0 PHVx 2 9 SCLK 360 f line --------------------------- + = fline SCLK ---------------- – 2 10 360 fline SCLK ---------------- – 2 9 360 PHCx 8:0 PHVx 2 10 SCLK 360 f line --------------------------- + = fline SCLK ---------------- – 2 9 3 360 fline SCLK ---------------- – 2 10 360 PHCx 8:0 PHVx 2 9 SCLK 360 f line --------------------------- + = |
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