71M6513H-IGT/F【PDF 14/104 页】IC ENERGY METER 3PH 100-LQFP

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71M6513/71M6513H

A Maxim Integrated Products Brand

3 -Phase Energy Meter IC

DATA SHEET

AUGUST 2011

1/2520.6Hz = 397μs

B

IB

VB

IC

2/32768Hz =

61.04μs

A

IA

VA

VC

C

13/32768Hz = 397μs

per mux cycle

Figure 4: Samples in Multiplexer Cycle

The end of each multiplexer cycle is signaled to the MPU by the CE_BUSY interrupt. At the end of each multiplexer cycle,

status information, such as sag data and the digitized input signal, is available to the MPU.

833ms

20ms

XFER_BUSY

Interrupt to MPU

Figure 5: Accumulation Interval

Figure 5 shows the accumulation interval resulting from PRE_SAMPS = 42 and SUM_CYCLES = 50, consisting of 2100 samples

of 397μs each (only one phase is shown) followed by the XFER_BUSY interrupt. The sampling in this example is applied to a

50Hz signal.

There is no correlation between the line signal frequency and the choice of PRE_SAMPS or SUM_CYCLES ( even though when

SUM_CYCLES = 42 one set of SUM_CYCLES happens to sample a period of 16.6ms). Furthermore, sampling does not have to

start when the line voltage crosses the zero line.

Delay Compensation

When measuring the energy of a phase (i.e., Wh and VARh) in a service, the voltage and current for that phase must be

sampled at the same instant. Otherwi se, the phase difference, Ф, introduces errors.

Page: 14 of 104

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