 |
Moteur de recherche de fiches techniques de composants électroniques |
|
|
Moteur de recherche de fiches techniques de composants électroniques |
|
ADE7752AAR Fiches technique(PDF) 21 Page - Analog Devices |
|
|
|||||||||||||||||||||||||||||
ADE7752AAR Fiches technique(HTML) 21 Page - Analog Devices |
|
|
21 / 24 page  ADE7752/ADE7752A Rev. C | Page 21 of 24 Table 6 shows a complete listing of all maximum output frequencies when using all three channel inputs. As the voltage and current inputs respect Equations 5 and 6, the total real power (P) is () ( ) () ( ) () () ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + × × × ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + × × − ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + × × + × × × ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + × × − × × = − × − + − − = 3 2 cos 2 3 4 cos 2 3 2 cos 2 cos 2 3 4 cos 2 cos 2 π ω π ω π ω ω π ω ω t I t V v t V t I t V t V P I I V V I I V V P l B l C l B l A l C l A BN BP C B AN AP C A Table 6. Maximum Output Frequency on F1 and F2 For simplification, assume that ϕA = ϕB = ϕ B C = 0 and VA = VB B = VC = V. The preceding equation becomes: () () ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + × + × ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × × × + × ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + × ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × × × = 3 2 cos sin 3 sin 2 cos 3 2 sin 3 2 sin 2 π t ω π t ω π I V t ω π t ω π I V P l l B l l A (9) P then becomes: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × × + ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × × = 3 2 sin 3 sin 3 2 2 sin 3 2 sin π ω π π ω π t I V t I V P l B BN l A AN (10) where VAN = V × sin(2π/3) and VBN = V × sin(π/3). As the LPF on each channel eliminates the 2ωl component of the equation, the real power measured by the ADE7752 is 2 3 2 3 × × + × × = B BN A AN I V I V P If full-scale ac voltage of ±500 mV peak is applied to the voltage channels and current channels, the expected output frequency is calculated as follows: value reference nominal V 4 . 2 0 2 5 . 0 500 1 1 0 , 60 . 0 7 1 = = = = = = = = = = = = = − REF C CN C B A BN AN V I V rms ac peak I I I V V S S SCF F V V m Hz Note that if the on-chip reference is used, actual output fre- quencies may vary from device to device due to reference tolerance of ±8%. Hz 139 . 0 2 3 4 . 2 2 2 60 . 0 5 . 0 5 . 0 181 . 6 2 2 = × × × × × × × = Freq SCF S1 S0 Max Frequency for AC Inputs (Hz) Max Frequency for DC Inputs (Hz) 1.02 0 0 0 0.51 1 0 0 0.48 0.96 0 0 1 2.04 4.09 1 0 1 1.91 3.84 0 1 0 7.67 15.35 1 1 0 7.67 15.35 0 1 1 30.70 61.4 0.48 1 1 1 0.24 FREQUENCY OUTPUT CF The pulse output calibration frequency (CF) is intended for use during calibration. The output pulse rate on CF can be up to 160 times the pulse rate on F1 and F2. The lower the F1–7 frequency selected, the higher the CF scaling. Table 7 shows how the two frequencies are related, depending on the states of the logic inputs S0, S1, and SCF. Because of its relatively high pulse rate, the frequency at this logic output is proportional to the instantaneous real power. As with F1 and F2, the frequency is derived from the output of the low-pass filter after multiplica- tion. However, because the output frequency is high, this real power information is accumulated over a much shorter time. Thus, less averaging is carried out in the digital-to-frequency conversion. With much less averaging of the real power signal, the CF output is much more responsive to power fluctuations. See Figure 15. Table 7. Maximum Output Frequency on CF SCF S1 S0 F1–7 (Hz) CF Max for AC Signals (Hz) 0 0 0 1.27 160 × F1, F2 = 81.87 1 0 0 1.19 8 × F1, F2 = 3.83 0 0 1 5.09 160 × F1, F2 = 327.46 1 0 1 4.77 16 × F1, F2 = 30.70 0 1 0 19.07 16 × F1, F2 = 122.81 1 1 0 19.07 8 × F1, F2 = 61.40 0 1 1 76.29 8 × F1, F2 = 245.61 1 1 1 0.60 16 × F1, F2 = 3.84 |
|
Lien URL |
| ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Lien vers la fiche technique | Echange de liens | Fabricants All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
French ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
