A High step-down DC-DC Converter

Investigation on the optimal operation and control strategy of a wide‐range switched‐capacitor/switched‐inductor DC/DC converter

“…Other items such as input current ripple, passive device capacity can be obtained indirectly through the formula in Table 3. Among them, coupled inductor is adopted in [7], [8], and [27], and the hybrid of switched capacitor and quadratic, switched-inductor, and inductor is adopted in [17], [18], and [24], respectively. The coupled inductor can achieve high step-down gain and wide input range by changing the duty cycle and coupling coefficient, and it is easy to achieve zero voltage switching (ZVS).…”

“…Switched capacitor is widely used due to its modular structure and high power density. More switched capacitor units are used in [17], [18], and [24], higher voltage gain can be obtained, but more devices are required. In addition, the capacitors in these converters should be operated in the NC mode (in Figure 4), and electrolytic capacitors with capacitance up to hundreds of μF and ESR up to tens of mΩ are required.…”

“…However, the conversion range of the converter is still limited by using only switched-inductor or switched-capacitor. Multi-cell switched-inductor and switched-capacitor [18][19][20] are subsequently designed for wide range conversion. Though lower voltage and current stress can be achieved, too many devices are used which increases topology complexity, cost, and reduces efficiency.…”