Os motores de busca de Datasheet de Componentes eletrônicos |
|
ADE7751ARSRL Folha de dados(PDF) 11 Page - Analog Devices |
|
ADE7751ARSRL Folha de dados(HTML) 11 Page - Analog Devices |
11 / 16 page REV. 0 ADE7751 –11– Using Equations 2 and 3, the real power P can be expressed in terms of its fundamental real power (P1) and harmonic real power (PH). P = P1 + PH where: PV I 11 1 1 1 1 1 =× = cos( ) – φ φα β (4) and (5) As shown in Equation 5 above, a harmonic real power compo- nent is generated for every harmonic, provided that harmonic is present in both the voltage and current waveforms. The power factor calculation has been shown previously to be accurate in the case of a pure sinusoid, therefore the harmonic real power must also correctly account for the power factor since it is made up of a series of pure sinusoids. Note that the input bandwidth of the analog inputs is 14 kHz with a master clock frequency of 3.5795 MHz. ANALOG INPUTS Channel V2 (Voltage Channel) The output of the line voltage transducer is connected to the ADE7751 at this analog input. Channel V2 is a fully differen- tial voltage input. The maximum peak differential signal on Channel 2 is ± 660 mV. Figure 4 illustrates the maximum signal levels that can be connected to the ADE7751 Channel 2. DIFFERENTIAL INPUT 600mV MAX PEAK +600mV AGND VCM V2 V2P VCM –600mV COMMON MODE 100mV MAX V2N V2 Figure 4. Maximum Signal Levels, Channel 2 Channel 2 must be driven from a common-mode voltage, i.e., the differential voltage signal on the input must be referenced to a common mode (usually AGND). The analog inputs of the ADE7751 can be driven with common-mode voltages of up to 100 mV with respect to AGND. However, best results are achieved using a common mode equal to AGND. Channel V1 (Current Channel) The voltage outputs from the current transducers are connected to the ADE7751 here. Channel V1 has two voltage inputs, namely V1A and V1B. These inputs are fully differential with respect to V1N. However, at any one time, only one is selected to perform the power calculation—see Fault Detection section. The analog inputs V1A, V1B, and V1N have the same maximum signal level restrictions as V2P and V2N. However, Channel 1 has a programmable gain amplifier (PGA) with user-selectable gains of 1, 2, 8, or 16—see Table I. These gains facilitate easy transducer interfacing. Figure 5 illustrates the maximum signal levels on V1A, V1B, and V1N. The maximum differential voltage is ±660 mV divided by the gain selection. Again, the differential voltage signal on the inputs must be referenced to a common mode, e.g., AGND. The maximum common-mode signal is ±100 mV as shown in Figure 5. V1A, V1B DIFFERENTIAL INPUT A 660mV/GAIN MAX PEAK AGND VCM V1A VCM –660mV GAIN COMMON MODE 100mV MAX V1N +660mV GAIN V1 V1B DIFFERENTIAL INPUT B 660mV/GAIN MAX PEAK V1 Figure 5. Maximum Signal Levels, Channel 1 Table I. Maximum G1 G0 Gain Differential Signal 00 1 ±660 mV 01 2 ±330 mV 10 8 ±82 mV 11 16 ±41 mV Typical Connection Diagrams Figure 6 shows a typical connection diagram for Channel V1. Here the analog inputs are being used to monitor both the phase and neutral currents. Because of the large potential difference between the phase and neutral, two CTs (current transformers) must be used to provide the isolation. Notice both CTs are referenced to AGND (analog ground), hence the common-mode voltage is 0 V. The CT turns ratio and burden resistor (Rb) are selected to give a peak differential voltage of ±660 mV/gain. V1B 660mV GAIN CT IN V1A AGND Rb Rf CT NEUTRAL PHASE IP V1N Cf Cf Rb 660mV GAIN Rf Figure 6. Typical Connection for Channel 1 PV I Hh h h hh h h = ∑ ×× = ≠ ∞ 1 cos( ) – φ φα β |
Nº de peça semelhante - ADE7751ARSRL |
|
Descrição semelhante - ADE7751ARSRL |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes 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 |