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T (13) By substituting equations (11) and (12) into equation (13), SC resistance RSC for Mode-1 is given by 7 − 3D (14) RSC = · Ron . 4D (1 − D ) The equivalent circuit shown in figure 6 can be expressed by the determinant using the Kettenmatrix. Therefore, by using equations (7) and (14), the equivalent circuit of the proposed step-up converter can be given by the circuit shown in figure 7 and the following determinants: Vin1 Iin1 = 1/M1 0 0 M1 Vo1 Iout , (15) Vin2 Iin2 = 1/M2 0 0 M2 Vo2 Iout , (16) Vo1 + Vo2 Iout = 1 0 RSC 1 Vout − Iout , (17) where M1 = 1/2 and M2 = 1.
There is about 140 megawatts per mile available round British coasts. It could make a useful contribution people needs, about twice that of the UK generating system is available provided. Although very large amounts of power are available in the waves, it is important to consider how much power can be extracted. A few years ago only a few percent efficiency had been achieved. Recently, however, several devices have been studied which have very high efficiencies. Some form of storage will be essential on a second-to-second and minute-to-minute basis to smooth the fluctuations of individual waves and wave’s packets but storage from one day to the next will certainly not be economic.
5, and Ron = 2 ohm. Figure 8 shows the output voltage of the proposed converter, where the output voltage was not regulated. In figure 8, input voltage Vin2 for Mode-1 and Mode-2 was set to Vin2 = Vin1 and Vin2 = Vin1 /2, respectively. As figure 8 shows, in spite of the change in Vin2 , the proposed converter can generate the stepped-up output voltage. In other words, the proposed converter can realize wide input-range of Vin2 . Figure 9 shows the power efficiency of the proposed converter as a function of output load R L .