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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AS8267 데이터시트(PDF) 131 Page - ams AG |
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AS8267 데이터시트(HTML) 131 Page - ams AG |
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131 / 136 page  Data Sheet AS8267 / AS8268 Revision 1.0, 19-Jun-07 Page 131 of 136 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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