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ADE7880 数据表(PDF) 58 Page - Analog Devices |
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ADE7880 数据表(HTML) 58 Page - Analog Devices |
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58 / 104 page  Data Sheet ADE7880 Rev. A | Page 58 of 104 IA, VA IB, VB IC, VC IN, ISUM HXWATT HYWATT HZWATT FWATT HXVAR HYVAR HZVAR FVAR HXVA HYVA HZVA FVA HXVRMS HYVRMS HZVRMS FVRMS HXIRMS HYIRMS HZIRMS FIRMS HXVHD HYVHD HZVHD VTHD HXIHD HYIHD HZIHD ITHD HXPF HYPF HZPF FPF ADE7880 HARMONIC CALCULATIONS HXVRMS HYVRMS HZVRMS HXIRMS HYIRMS HZIRMS IN RESULTS ISUM RESULTS HXVHD HYVHD HZVHD HXIHD HYIHD HZIHD IN RESULTS ISUM RESULTS HPHASE BITS HCONFIG[2,1] SELECT THE PHASE BEING MONITORED OUTPUT REGISTERS USED WHEN ONE OF PHASES A, B, C IS ANALYZED ACTPHSEL BITS HCONFIG[9,8] SELECT THE PHASE USED TO AS TIME BASE HX, HY, HZ REGISTERS SELECT THE HARMONICS TO MONITOR HRATE BITS HCONFIG[7:5] SELECT THE UPDATE RATE OF HARMONIC REGISTERS HSTIME BITS HCONFIG[4,3] SELECT THE DELAY IN TRIGGERING HREADY INTERRUPT HRCFG BIT HCONFIG[0] SELECTS IF HREADY FLAG IN STATUS0 IS SET IMMEDIATELY OF AFTER HSTIME OUTPUT REGISTERS USED WHEN NEUTRAL CURRENT IS ANALYZED Figure 82. ADE7880 Harmonic Engine Block Diagram When the neutral current and the sum of the three phase currents represented by ISUM register are analyzed, the following metering quantities are computed for both currents: • RMS of fundamental and of up to 2 harmonics or rms of up to three harmonics: Ix, Iy, Iz, x, y, z = 1,2, 3,…, N. • Harmonic distortions of the analyzed harmonics. Configuring the Harmonic Calculations The ADE7880 requires a time base provided by a phase voltage. Bit 9 and Bit 8 (ACTPHSEL) of HCONFIG[15:0]register select this phase voltage. If ACTPHSEL = 00, the phase A is used. If ACTPHSEL = 01, the Phase B is used and if ACTPHSEL = 10, the Phase C is used. If the phase voltage used as time base is down, select another phase, and the harmonic engine continues to work properly. The phase under analysis is selected by Bit 2 and Bit 1 (HPHASE) of HCONFIG[15:0]register. If HPHASE = 00, the Phase A is monitored. If HPHASE = 01, the Phase B is monitored and if HPHASE = 10, the Phase C is monitored. If HPHASE = 11, the neutral current together with the sum of the phase currents represented by ISUM register are monitored. Harmonic Calculations When a Phase is Monitored When a phase is monitored, fundamental information together with information about up to three harmonics is computed. The indexes of the three additional harmonics simultaneously monitored by the ADE7880 are provided by the 8-bit registers HX, HY, and HZ. Simply write the index of the harmonic into the register for that harmonic to be monitored. If the second harmonic is monitored, write 2. If harmonic 51 is desired, write 51. The fundamental components are always monitored, independent of the values written into HX, HY, or HZ. Therefore, if one of these registers is made equal to 1, the ADE7880 monitors the fundamental components multiple times. The maximum index allowed in HX, HY, and HZ registers is 63. The no attenuation pass band is 2.8 kHz, corresponding to a −3 dB bandwidth of 3.3 kHz, thus all harmonics of frequency lower than 2800 Hz are supported without attenuation. The rms of the phase voltage and phase current fundamental components are stored into FVRMS and FIRMS 24-bit signed registers. The associated data path is presented in Figure 83. Similar to the rms current and voltage rms data paths presented in Root Mean Square Measurement section, the data path contains 24-bit signed offset compensation registers xIRMSOS, xVRMSOS, x = A, B, C for each phase quantity. The rms of the phase current and phase voltage three harmonic components are stored into HXVRMS, HXIRMS, HYVRMS, HYIRMS, HZVRMS, and HZIRMS 24-bit signed registers. The associated data path is presented in Figure 84 and contains the following 24-bit signed offset compensation registers: HXIRMSOS, HYIRMSOS, HZIRMSOS, HXVRMSOS, HYVRMSOS, and HZVRMSOS. It is recommended to leave the offset compensation registers at 0, the default value. |
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