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基于零输入电流纹波高增益DC-DC变换器建模设计
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Abstract:
文章提出了一种具有零输入电流纹波特性的高增益升压型DC-DC变换器。在该变换器中，由耦合电感和电感电容组成的辅助支路实现了输入电流零纹波，通过结合耦合电感和电压倍增单元(VMC)使得电压增益显著提高。此外，输出侧耦合电感漏感中储存的能量可以被回收利用，钳位电路大大降低了开关管的电压应力和尖峰，因此可以使用具有更低导通电阻的开关以提高效率。仿真结果表明，所提出的变换器在光伏电流为7.07 A，滤波电容为5 μF的条件下实现了稳定的功率输出，最大功率点追踪(MPPT)效率为98.8%。这项工作为光伏发电系统提供了一种稳定高效的方案。
This paper proposes a high step-up DC-DC converter with zero input current ripple characteristics. In the proposed converter, an auxiliary branch composed of coupled inductors and inductor-capacitor networks achieves zero input current ripple, while the integration of coupled inductors with a voltage multiplier cell (VMC) significantly enhances the voltage gain. Furthermore, the energy stored in the leakage inductance of the output-side coupled inductor is effectively recycled. A clamp circuit substantially reduces voltage stress and switching spikes on power switches, enabling the use of switches with lower on-state resistance to improve efficiency. Simulation results demonstrate that the proposed converter achieves stable power output under a photovoltaic current of 7.07 A with 5 μF filter capacitance, attaining a maximum power point tracking (MPPT) efficiency of 98.8%. This work provides a stable and efficient solution for photovoltaic power generation systems.
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