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STPM32 Datasheet(PDF) 53 Page - STMicroelectronics |
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STPM32 Datasheet(HTML) 53 Page - STMicroelectronics |
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53 / 121 page  DS10272 Rev 8 53/121 STPM32, STPM33, STPM34 Theory of operation 121 8.4.8 Zero-crossing signal Zero-crossing signals of voltage and current come from fundamental values of voltage and current and output from LPF filter. Resolution of the zero-crossing signal is 8 s given by FCLK clock = 125 kHz. Figure 39. Zero-crossing generation ZRC signal is delayed by an instantaneous voltage current signal: 5.1 ms (typical), as shown in Figure 40. Instantaneous current normalized Instantaneous voltage LSB value Instantaneous current LSB value Table 15. STPM3x current voltage LSB values (continued) Parameter Value in I norm 1 – 2 23 in 23 in 22:0 + 2 23 ------------------------------------------------------------------------------------ = LSBVMOM Vref 1R1 R2 + calV AV 2 23 ----------------------------------------------- = V LSBIMOM Vref calI AI 2 23 k S kint --------------------------------------------------------- A = ZRC_V ZCR detector FClk 125 kHz ZRC_I VxFund[23:0] Cx Fund[23:0] GIPG2803141125LM |
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