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AS8218 Datasheet(PDF) 118 Page - ams AG |
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AS8218 Datasheet(HTML) 118 Page - ams AG |
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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: p p shunt I V R = 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: 2 I V R L ) p ( in 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: V mains R1A+R1B R2 V in ) P ( in ) P ( in mains V ) V V ( 2 R B 1 R A 1 R − × = + 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: 8 / f f 360 f f 360 t t 360 unit 1 osc mains ovs mains mains ovs × ° = × ° = × ° = 8 / f f 360 unit # Phase osc mains × ° × = |
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