SA9105F 查看數據表（PDF） - South African Micro Electronic Systems

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SA9105F

THREE PHASE BIDIRECTIONAL POWER/ENERGY METERING IC WITH INSTANTANEOUS PULSE OUTPUT

South African Micro Electronic Systems 

SA9105F

5. Pulse Output Signals

The calculated power is divided down to a pulse rate of 64Hz, for rated conditions

on both FOUT1 and FOUT2.

The format of the pulse output signal, which provides power/energy and direction

information, is the only difference between the signals on FOUT1 and FOUT2.

The direction of the energy flow is defined by the mark/space ratio on FOUT1, while

the pulse width defines the direction on FOUT2.

Positive Energy Flow

Negative Energy Flow

Wave form on FOUT1

Wave form on FOUT2

t pp

t pp

mm

mm

t pp = 1.1ms

t pn

t pn

mm

mm

t pn = 3.4ms

Wave form on DIR

DR-00950

An integrated anticreep function ensures no metering at zero line currents.

The formula for calculating the Output Frequency (f) is given below:

f = 11.16

*

FOUTX

FOSC

* 3.58MHz

*

(II1 IV1) + (II2 IV2) + (II3 IV3)

3 * IR2

Where FOUTX = Nominal rated frequency (64Hz)

FOSC = Oscillator frequency (2MHz ...... 4MHz)

I , I , I = Input currents for current sensor inputs (16µA at rated line current)

I1 I2 I3

IV1, IV2, IV3 = Input currents for voltage sensor inputs (14µA at rated line voltage)

I

= Reference current (typically 50µA)

R

TYPICAL APPLICATION

In the Application Circuit (Figure 1), the components required for a three phase power

metering application are shown. Terminated current transformers are used for current

sensing.

The most important external components for the SA9105F integrated circuit are:

sames

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