A soft-switching high-gain converter with dual-input inductance and its control method

Abstract

The invention belongs to DC-DC step-up conversion technology, in particular to a double-input inductance soft-switching high-gain converter and a control method thereof, wherein the positive pole of the input power supply is connected to one end of the first inductance, one end of the second inductance, and an input filter Capacitance C in The positive pole of the input power supply is connected to the source of the first switching tube, the source of the second switching tube, the negative pole of the first capacitor, the drain of the third switching tube, and the input filter capacitor C in The drain of the first switching tube is connected to the other end of the first inductor and the anode of the first diode; the drain of the second switching tube is connected to the other end of the second inductor and the positive electrode of the second capacitor; The cathode of the first diode is connected to the positive pole of the first capacitor and one end of the output filter inductor; the negative pole of the second capacitor is connected to the source of the third switching tube, the negative pole of the output filter capacitor, and one end of the DC load; the output filter inductor The other end of the capacitor is connected to the positive pole of the output filter capacitor and the other end of the DC load.

Description

technical field [0001] The invention belongs to DC-DC step-up conversion technology, in particular to a double-input inductance soft-switching high-gain converter and a control method thereof. Background technique [0002] The terminal voltage of renewable energy generating units such as fuel cells, photovoltaic cells or batteries is low and varies widely. Therefore, the distributed renewable energy grid-connected power generation system generally adopts a two-stage structure of a DC boost converter cascaded with a voltage-type inverter. [0003] Boost converter is the most widely used DC boost converter. The input current is continuous and the structure is simple, but the actual voltage gain is affected by circuit parasitic parameters and has a maximum value (generally lower than 5), and the duty cycle corresponding to this gain is close to 1, and the current stress and voltage stress of the power tube are relatively large , the system efficiency is severely reduced. The...

AI Technical Summary

Problems solved by technology

However, this topology has the following problems: (1) The input inductor current is equal to the input current, and the average current stress is large, so the inductor volume and copper consumption are large; (2) The current ripple of the input inductor is large, and a large number of parallel circuits need to be connected at the input end. Capacitors to reduce input current ripple and improve power generation efficiency and service life of renewable energy power generation units

Since high-voltage power devices have larger on-state voltage drop (or on-state resistance) and higher prices, their on-state loss and cost are higher and their efficiency is lower.

In addition, the converter also has shortcomings such as insufficient boosting capability, large number of components, and complex structure.

In addition, most current dual-input inductor-switched-capacitor high-gain converters do not achieve zero-voltage turn-on of power transistors, resulting in large switching losses and difficult to improve system conversion efficiency.

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