A Hybrid Interleaved DC-DC Converter With a Wide Step-Up Regulation Range and Ultralow Voltage Stress

In this article, a hybrid interleaved connecting boost converter (HIBC) with a wide step-up regulation range is proposed, which is suitable for the low-voltage distributed generation applications. In the input of the HIBC, the primary windings of the double-coupled inductors are interleaved parallel connection, inheriting shared current and reduced current ripples. Then, the lossless passive clamped circuits are used to recycle the leakage energy of the coupled inductor and to reduce the voltage stress on the semiconductor devices to a very low level. The secondary windings of the coupled inductors are, respectively, combined with a capacitor-diode to form the two voltage multiplier units, which are again, respectively, connected with an output capacitor for a voltage-doubling module. These two voltage-doubling modules are connected in interleaved series for supplying power to the output, whose structure enhances the voltage gain greatly without adopting an extreme duty cycle and reduces the output voltage ripples. In addition, the main switches of the proposed converter can be operated in zero-current switching and full duty cycle range in theory, achieving a wide step-up regulation range with the high efficiency. Finally, the theoretical behaviors of the presented converter are described in detail and some experimental results are also shown to demonstrate the effectiveness of the proposed converter.