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Clean Energy Systems and Experiences Part 3

Tham khảo tài liệu 'clean energy systems and experiences part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | A dual-input DC-DC converter using clean energy power supplies 23 Input voltage V 2 Conversion ration Block-1 Block-2 Mode-1 t - V 2 1 2 x 1x Mode-2 y V 2 2 1x 1x Mode-3 V 2 y 3 2 0x Table 2. Setting of conversion ratio Phase On Off Mode-1 Charging State T1 S1 S2 S3 S4 S5 S6 S7 Sg S9 S10 Transfer State T2 S5 S6 S7 Sg S1 S2 S3 S4 S9 S10 Mode-2 Charging State T1 S1 S2 S3 S4 S5 s6 S7 Sg S9 S10 Transfer State T2 S2 S6 S7 S1 S3 S4 S5 Sg S9 S10 Mode-3 Charging State T1 S1 s2 S3 S4 S5 s6 S7 Sg S9 S10 Transfer State T2 S7 Sg S9 S10 S1 S2 S3 S4 S5 S6 Table 3. Setting of clock pulses Figure 4 shows the comparison concerning the input range of figures 2 and 3. As figure 4 shows the proposed converter can extend the input range of Vi 2 from Vi 2 Vtag 2 to V 2 Vtag 3. Concretely in comparison with the conventional parallel converter using 1.5x step-up converters the proposed converter can achieve 16 extension of input range. Furthermore the proposed converter can realize small hardware-cost. Table 4 shows the comparison concerning the hardware-cost of figures 2 and 3. As Table 4 shows the hardware-cost of the proposed converter is less than 80 of that of the conventional converter. The circuit properties of the proposed serial converter will be described in the following section. 3. Theoretical Analysis First the equivalent circuit of the proposed converter is analyzed. To save space only the analysis for Mode-1 is described in this section 4 . In the theoretical analysis we assume that 1. parasitic elements are negligibly small and 2. time constant is much larger than the period of clock pulses. Figure 5 shows instantaneous equivalent circuits of the proposed converter. In figure 5 Ron 5 denotes the on-resistance of power switches. 4 The theoretical analysis for Mode-2 and Mode-3 will be described in Appendix. 5 SC power converters are known as an implementable converter because they do not require magnetic elements. In the converter block implemented into a chip the direction