AS8218 datasheet(118/123 Pages) AMSCO

Il numero della parte	AS8218

Spiegazioni elettronici	Highly Integrated Single Phase 2 Current Energy Metering Integrated Circuits

PDF	123 Pages

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Produttore elettronici	AMSCO [ams AG]

Homepage	http://www.ams.com

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118 / 123 page

Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 118 of 123

13.

Collection of Formulae

Shunt resistor for mains current sensing:

shunt

Where Vp is the peak input voltage to the IC at rated conditions and Ip the peak Imax value of the meter.

CT voltage setting termination resistor for mains current sensing:

)

(

VS =

Where Vin(p) is the peak input voltage to the IC at rated conditions (Vmains; Imax). i.e.: If Gain = 4 then Vin(p) must

be set at 150mVpeak and IL is the CT RMS secondary current at rated conditions (Vmains; Imax)

Voltage divider for the Vmains input for the energy calculation:

mains

R1A+R1B

)

(

)

(

mains

)

(

−

Where Vmains is the peak mains voltage and Vin(P) is the is the peak input voltage to the IC at rated conditions.

Phase shift value of 1 unit of phase correction relative to the mains frequency:

360

unit

osc

mains

ovs

mains

ovs

360

unit

Phase

osc

mains

AS8218 Scheda tecnica(PDF) 118 Page - ams AG