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STPM32 数据表(PDF) 35 Page - STMicroelectronics |
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STPM32 数据表(HTML) 35 Page - STMicroelectronics |
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35 / 89 page  Figure 39. Zero-crossing generation ZRC_V ZCR detector FClk 125kHz ZRC_I Vx Fund[23:0] Cx Fund[23:0] ZRC signal is delayed by an instantaneous voltage current signal: 5.1 ms (typical), as shown in Figure 40. Figure 40. Zero-crossing signal ZRC Signal 8.4.9 Phase meter Phase meter detects: • The period of the voltage line • The phase-angle delay between voltage and current Figure 41. Phase meter ZRC_V Period & Phase Angle Detector FClk 125kHz ZRC_I Cx_PHA[11:0] PHx PERIOD[11:0] PER_ERR Period measurement Starting from ZRC signals, line period and voltage/current phase shift are calculated. Period information for the two phases is located in DSP_REG1 register. The measurement of the period is from ZRC signal of voltage channel. The period is calculated like an average of last eight measured periods. The initial values of period are set on 0x9C4 (2500). LSB of period is 8 μs given by FCLK clock = 125 kHz. Limits to consider the correct period are between 0x600 (1536) and 0xF00 (3840) corresponding to a frequency range between 32.55 and 81.38 Hz. STPM32, STPM33, STPM34 Functional description of hardwired DSP DS10272 - Rev 13 page 35/89 |
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