Cirrus-logic AN366 Manuel d'utilisateur télécharger pdf (Page 11)

AN366

AN366REV2 11

Figure 6. Phase Compensation and Phase Offset Error

4.2.2 No Load Power Compensation

There are two power compensations in the CS5480/84/90: active and reactive power offset. When no load

is applied, the average active power register, P

AVG

, and average reactive power register, Q

AVG

, may have

offsets. To remove any remaining active or reactive power, it is necessary to perform the following compen-

sation:

- Apply full scale voltage source

- Apply no load to the current channel(s)

- Start continuous conversion

- Read P

AVG

and Q

AVG

- Write -P

AVG

and -Q

AVG

to P

OFF

and Q

OFF

, respectively

0º

Before Calibration V is delayed from I

Delay added to I

8 .99 º @ 50 Hz

10.79 º @ 60Hz

4.5º @ 50Hz

5.4º @ 60Hz

-4.5º @ 50Hz

-5.4º @ 60Hz

-8.99º @ 50Hz

-10 .79 º @ 60 H z

Before Calibration I is delayed from V

Delay added to V

Set CPCC = 11 of 2OW R on V

+ FPCC provides adjustment

Set CPCC = 10 of 1OW R on V

+ FPCC provides adjustment

Clear CPCC = 00

+ FPCC provides adjustment

Set CPCC = 01 of 1OWR on I

+ FPCC provides adjustment

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 49 50

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Cirrus-logic AN366 Manuel d'utilisateur Page 11

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