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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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STPM32TR Datasheet(PDF) 52 Page - STMicroelectronics |
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STPM32TR Datasheet(HTML) 52 Page - STMicroelectronics |
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52 / 121 page  Theory of operation STPM32, STPM33, STPM34 52/121 DS10272 Rev 8 With an AC input signal: Equation 10 The LP filter cuts the 2nd harmonic component of input signal multiplying it by a dumping factor α: Equation 11 R result is a DC signal plus the 2nd harmonic ripple with the amplitude of α/2. For dumping factor | α |<<1: Equation 12 RMS updated values are available in DSP_REG14 and DSP_REG15 registers every 128 μs. Raw ADC samples are also available for post-processing by MCU in registers from DSP_REG2 to DSP_REG9. By taking into account the internal parameters in Table 13 and the analog front end components in Table 14, LSB values of voltage and current registers are the following: Table 15. STPM3x current voltage LSB values Parameter Value Voltage RMS LSB value Current RMS LSB value Instantaneous voltage normalized RA 1 2 t cos – 2 -------------------------------------- A 2 ------- 1 2 --- t cos – = R A 2 ------- LSBVRMS Vref 1R1 R2 + calV AV 2 15 ----------------------------------------------- = V LSBIRMS Vref calI AI 2 17 k S kint --------------------------------------------------------- = A vn V norm 1 – 2 23 vn 23 vn 22:0 + 2 23 --------------------------------------------------------------------------------------- = |
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