Power frequencies circuit diagrams

The photocurrent generates a signal voltage Vs = ph = L ph across the load resistor that is proportional to the absorbed radiation power over a large intensity range of several decades, as long as Vs < AEg/ (Fig. 4.85b). From the circuit diagram in Fig. 4.86 with the capacitance Cs of the semiconductor and its series and parallel resistances and Rp, one obtains for the upper frequency limit [4.107]... 

For the purpose of the present document, the area of interest here is the Incoming Power Conversion section of the Variable Frequency Drive (VFD), the Front End of the drive, this is what the AC feeder network sees and from which the effects in concern originate from. All other considerations downstream such as Inverter frequency, motor harmonics, motor power factor etc. are totally independent of the AC front end side, effectively isolated by the DC intermediate circuit. In the above diagram, the term AC to DC converter is used as a generic term to describe Passive and Active Front End types. 

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