Current continuous type high-gain DC-DC converter circuit

Abstract

The invention provides a current continuous type high-gain DC-DC converter circuit. The current continuous type high-gain DC-DC converter circuit comprises a voltage source, a first inductor, a first diode, a first capacitor, a two-end impedance network, a third diode, an MOS transistor, a fourth inductor, an output capacitor and a load, wherein the two-end impedance network is composed of a second inductor, a third inductor, a second capacitor, a third capacitor and a second diode. The voltage source, the first inductor, the third diode and the MOS transistor are sequentially connected in series to form a first level booster circuit, the first capacitor, the two-end impedance network and the MOS transistor are sequentially connected in series to form a second level booster circuit, and the fourth inductor, the output capacitor and the load form an output circuit. The whole circuit is simple in structure, only one MOS transistor is adopted, high output voltage gains are possessed, power currents are continuous, load currents are continuous, input and output are both grounded, voltage stress of the capacitors in the two-end impedance network is low, and starting impulse currents and impulse currents generated at the moment the MOS transistor is switched on do not exist in the circuit.

Description

Technical field [0001] The invention relates to the technical field of power electronic circuits, in particular to a current continuous high-gain DC-DC converter circuit. Background technique [0002] In fuel cell power generation and photovoltaic power generation, due to the low DC voltage provided by a single solar cell or a single fuel cell, it cannot meet the electricity demand of existing electrical equipment, nor can it meet the demand for grid connection. It is often necessary to connect multiple batteries Connect in series to achieve the required voltage. On the one hand, this method greatly reduces the reliability of the entire system, on the other hand, it also needs to solve the problem of series voltage equalization. For this reason, a high-gain DC-DC converter capable of converting low voltage to high voltage is required. The Z-source boost DC-DC converter proposed in recent years is a high-gain DC-DC converter, but the circuit has a high impedance network capacito...

AI Technical Summary

Problems solved by technology

The Z-source step-up DC-DC converter proposed in recent years is a high-gain DC-DC converter, but the circuit has a high impedance network capacitance voltage stress, the power supply current is discontinuous, and the output and input are not shared. Moreover, there is a large starting inrush current problem when the circuit is started, which limits the practical application of the circuit

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