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ADE8052Z-PRG1 データシート(PDF) 58 Page - Analog Devices |
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ADE8052Z-PRG1 データシート(HTML) 58 Page - Analog Devices |
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58 / 156 page  ADE5166/ADE5169/ADE5566/ADE5569 Rev. B | Page 58 of 156 LPF3 LPF1 VOLTAGE CHANNEL 0x28F5C2 + + VRMSOS[11:0] VOLTAGE SIGNAL (V(t)) 0x28F5 0x0 0xD70B 216 sgn 215 27 26 28 Vrms(t) 0x00 Vrms[23:0] |X| Figure 63. Voltage Channel RMS Signal Processing Voltage Channel RMS Calculation Figure 63 shows details of the signal processing chain for the rms calculation on the voltage channel. This voltage rms estimation is done in the ADE5166/ADE5169/ADE5566/ADE5569 using the mean absolute value calculation, as shown in Figure 63. The voltage channel rms value is processed from the samples used in the voltage channel waveform sampling mode and is stored in the unsigned 24-bit VRMS SFRs (VRMSL, Address 0xD1; VRMSM, Address 0xD2; and VRMSH, Address 0xD3). The update rate of the voltage channel rms measurement is MCLK/5. To minimize noise in the reading of the register, the VRMS SFRs can also be configured to update only with the zero crossing of the voltage input. This configuration is done by setting the ZXRMS bit (Bit 2) in the MODE2 register (Address 0x0C). With the specified full-scale ac analog input signal of 0.5 V, the output from the LPF1 in Figure 63 swings between 0x28F5 and 0xD70B at 60 Hz (see the Voltage Channel ADC section). The equivalent rms value of this full-scale ac signal is approximately 0d1,898,124 (0x1CF68C) in the VRMS SFRs. The voltage rms measurement provided in the ADE5166/ADE5169/ADE5566/ ADE5569 is accurate to within ±0.5% for signal input between full scale and full scale/20. The conversion from the register value to volts must be done externally in the microprocessor using a V/LSB constant. Voltage Channel RMS Offset Compensation The ADE5166/ADE5169/ADE5566/ADE5569 incorporate the voltage channel rms offset compensation register (VRMSOS, Address 0x23). This 12-bit, signed register can be used to remove offset in the voltage channel rms calculation. An offset can exist in the rms calculation due to input noises and dc offset in the input samples. One LSB of the voltage channel rms offset is equivalent to 64 LSBs of the voltage channel rms register. Assuming that the maximum value from the voltage channel rms calculation is 0d1,898,124 with full-scale ac inputs, then 1 LSB of the voltage channel rms offset represents 3.37% of measurement error at −60 dB down from full scale. Vrms = Vrms0 + 64 × VRMSOS (5) where Vrms0 is the rms measurement without offset correction. ACTIVE POWER CALCULATION Active power is defined as the rate of energy flow from source to load. It is the product of the voltage and current waveforms. The resulting waveform is called the instantaneous power signal and is equal to the rate of energy flow at every instant of time. The unit of power is the watt or joules/second. Equation 8 gives an expression for the instantaneous power signal in an ac system. () ) sin( 2 t V t V ω × = (6) () ) sin( 2 t I t I ω × = (7) where: V is the rms voltage. I is the rms current. P(t) = V(t) × I(t) ) 2 cos( ) ( t VI VI t P ω − = (8) The average power over an integral number of line cycles (n) is given by the expression in Equation 9. ∫ = = nT VI dt t P nT P 0 ) ( 1 (9) where: T is the line cycle period. P is referred to as the active or real power. |
同様の部品番号 - ADE8052Z-PRG1 |
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同様の説明 - ADE8052Z-PRG1 |
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