Interleaved Parallel DC/DC Boost Converter Based on Switched Inductor/Switched Capacitor Units

Abstract

The invention discloses an interleaved parallel DC / DC step-up converter based on switched inductance / switched capacitor units, which belongs to the field of power electronic converters. Based on the interleaved parallel boost unit, the converter combines a switched inductor unit composed of an inductor and a diode, and a switched capacitor unit composed of a capacitor and a diode. By controlling the on and off of the two power switch tubes, it can change The on-off situation of the diode and the connection method of the inductance and capacitance in the circuit can achieve the effect of increasing the voltage gain. The invention has higher voltage gain, lower voltage stress borne by switching devices, and smaller average value and ripple of inductor current, which helps to reduce the conduction loss of switching devices and the volume of a single inductor, and is suitable for fuel cells, photovoltaic cells, etc. New energy power generation system.

Description

technical field [0001] The invention relates to an interleaved parallel DC / DC step-up converter based on switched inductor / switched capacitor units, which belongs to the field of power electronic converters. Background technique [0002] Energy is the material basis for the development of human society and plays a decisive role in the development of society. Under the dual pressure of energy and environment, new energy power generation technologies such as wind energy, solar energy and hydrogen energy have obtained unprecedented development opportunities. As a clean and efficient new energy power generation device, fuel cells can directly convert hydrogen energy into electrical energy, which is neither limited by the Carnot cycle nor pollutes the environment, greatly improving energy utilization efficiency. However, the fuel cell has the characteristics of a low-voltage, high-current output current source, and it is difficult to directly connect to the inverter system for g...

AI Technical Summary

Problems solved by technology

The interleaved parallel Boost converter has smaller input current ripple, and can use the current sharing technology to share the power of the converter, but only when it works under an extreme duty cycle can a higher voltage gain be obtained and the loss of the power device is larger; The Boost converter based on the coupled inductor achieves higher voltage gain by changing the winding ratio of the coupled inductor, but due to the influence of the leakage inductance, it is necessary to introduce a clamp circuit to suppress the turn-off voltage peak of the switching tube; the Boost converter based on the switched inductor unit The converter expands the voltage gain range, but the voltage stress of the power device is still large and the gain is limited; the voltage stress of the switching device in the Boost converter based on the switched capacitor unit is small, but the effective value of the current flowing through the power switch tube is large and the voltage The gain is only twice that of the Boost converter

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