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  GCE Advanced Level Past Questions   Technical and Vocational Education Examinations Electrical Power Systems EPS Power Electronics Specialty Name (Specialty Code) Electrical Power Systems EPS (F3) Subject Title   Power Electronics Paper Nº   2 Subject Code Nº 7235  1.  Control of a D.C motor          The circuit shown in figure 1, include the control and the power circuit of a DC motor to make the up and down movements of a system. All the OP-AMP and switches are ideal a)   Study of the control circuit (OA1; R’s and (AO2). i)       Give the operating mode of the operational amplifiers (OA1; R’s) and (AO2).                  ( 6 marks) ii)      prove that the expression of the voltage at the OA1  inverting input terminal in function of V 1  and V 01  is  V- = ( V 1  + V 01 ) / 2         (6 marks) iii) Prove that the expression of the voltage a