A kind of dual-transistor z-source DC voltage converter

Abstract

The invention discloses a double-pipe Z-source direct-current voltage converter. The converter comprises a voltage source, an inductor, a capacitor, a first switch tube, a second switch tube, a first diode, a second diode and a load. The positive electrode of the voltage source is connected with one end of the inductor, and the negative electrode is connected with the source electrode of the first switch tube and the cathode of the first diode. The drain electrode of the first switch tube is connected with the cathode of the second diode, the positive electrode of the capacitor and one end of the load. The drain electrode of the second switch tube is connected with the anode of the first diode, the negative electrode of the capacitor and the other end of the load. The converter is simple in structure and convenient to control, input current is continuous, quite high output voltage gain under the low duty ratio can be achieved and the circuit is free from a start impacting problem.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a dual-tube Z-source DC voltage converter. Background technique [0002] With the rapid development of industrial production, high-power, high-gain converters are playing an increasingly important role in occasions that require power conversion. The Z-source converter proposed in recent years achieves a large output voltage at a low duty cycle, and overcomes the defects of the boost converter such as the excessive peak current of the switch tube and diode caused by the limit duty cycle. However, the input current of the traditional Z-source converter is discontinuous, which is not conducive to input side filtering. At the same time, the Z-source converter uses two capacitors and two inductors, which is not conducive to reducing the volume of the system and improving the power density of the system. Contents of the invention [0003] The purpose of the prese...

AI Technical Summary

Problems solved by technology

The Z-source converter proposed in recent years achieves a large output voltage at a low duty cycle, and overcomes the defects of the boost converter such as excessive peak current of the switch tube and diode caused by the limit duty cycle.

However, the input current of the traditional Z-source converter is discontinuous, which is not conducive to input side filtering. At the same time, the Z-source converter uses two capacitors and two inductors, which is not conducive to reducing the volume of the system and improving the power density of the system.

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