PM9105AP 查看數據表（PDF） - South African Micro Electronic Systems

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PM9105AP

THREE PHASE POWER/ENERGY METERING MODULE PULSE OUTPUT

South African Micro Electronic Systems 

PM9105AP

The values of these resistors should be calculated as follows:

Phase 1:

R8 = R9 = (IL1/16µA) x R18/2

Phase 2:

R10 = R11 = (IL2/16µA) x R19/2

Phase 3:

R

12

=

R

13

=

(IL3/16µA)

x

R /2

20

Where ILX

=

Secondary CT current at rated conditions.

R , R and R =

18 19

20

Termination resistors of the three current transformers.

R1 + R1A, R4 and R15 set the current for the phase 1 voltage sense input. R2 + R2A,

R + P and R set the current for phase 2 and R + R , R + P and R set the current

55

16

3

3A 6

6

17

for Phase 3. The values should be selected so that the input currents into the voltage

sense inputs (virtual ground) is set to 14µA at nominal line voltage. Capacitors C1,

C2 and C3 are for decoupling and phase compensation.

R + P defines all on-chip bias and reference currents.

14

14

With

R

14

+

P

14

=

24kΩ,

optimum conditions are set. P may be varied within ± 10% for calibration purposes.

14

Any changes to R14 will affect the output quadratically (i.e: ∆R = +5%, ∆FOUT =

+10%).

XTAL is a colour burst TV crystal (f = 3.5795 MHz) for the oscillator. The oscillator

frequency is divided down to 1.7897 MHz on-chip to supply the digital circuitry and

the A/D converters.

sames

5/10

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