ADE7932 datasheet(66/120 Pages) AD

tên linh kiện	ADE7932

Giải thích chi tiết về linh kiện	Isolated Energy Metering Chipset for Polyphase Shunt Meters

PDF	120 Pages

Scroll/Zoom	100%

nhà sản xuất	AD [Analog Devices]

Trang chủ	http://www.analog.com

Logo

66 / 120 page

ADE7978/ADE7933/ADE7932

Data Sheet

Rev. 0 | Page 66 of 120

TOTAL HARMONIC DISTORTION CALCULATION

The ADE7978 computes the total harmonic distortion (THD)

on all phase currents and voltages. The THD expressions are

shown in the following equations:

THDI

−

(49)

THDV

−

where:

I and V are the rms values of the phase currents and voltages

stored in the AIRMS, AVRMS, BIRMS, BVRMS, CIRMS, and

CVRMS registers.

I1 and V1 are the fundamental rms values stored in the AFIRMS,

AFVRMS, BFIRMS, BFVRMS, CFIRMS, and CFVRMS

registers.

The THD calculations are stored in the AVTHD, AITHD,

BVTHD, BITHD, CVTHD, and CITHD registers (Address 0xE521

to Address 0xE526). These registers are 24-bit registers in 3.21

signed format. This means the ratios are limited to +3.9999 and

all greater results are clamped to it.

Like the xIRMS and xFIRMS registers, the 24-bit signed xITHD

and xVTHD registers are transmitted as 32-bit registers with

the eight MSBs padded with 0s (see Figure 67).

ADE7932 bảng dữ liệu(PDF) 66 Page - Analog Devices