A single-stage boost inverter and its control method

Abstract

The invention discloses a single-stage boost inverter, and belongs to the technical field of power electronic converters. The single-stage boost inverter comprises power switch tubes S1, S2, S3, S4 and S5, diodes D1, D2 and D3, an inductor L1 and a capacitor C1; one end of the inductor L1 is connected with one end of an input power supply Uin; the other end of the inductor L1 is connected with theanode of the diode D1; the cathode of the diode D1 is connected with the A end of the power switch tube S1, the A end of the power switch tube S2 and one end of the capacitor C1, respectively; the anode of the diode D2 is connected with the other end of the capacitor C1, the power switch tube S3, the C end of the power switch tube S4 and the anode of the diode D3, respectively; and the cathode ofthe diode D2 is connected with the C end of the power switch tube S1, the A end of the power switch tube S5 and the other end of the input power supply Uin, respectively. Aiming at the problem of lowstep-up ratio of the boost converter in the prior art, the single-stage boost inverter is high in integration level and relatively high in step-up ratio.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a single-stage boost inverter and a control method thereof. Background technique [0002] In the current context of increasingly tense global energy supply, the control and transformation of renewable energy distributed power generation, AC starter control, electric vehicle drive, new starter power generation technology, etc., are inseparable from power electronic inverter technology. Therefore, it is of great practical significance to develop a boost inverter technology with high efficiency, high reliability, high power density and small size. [0003] The traditional low-power inverter system is mainly realized by two stages, the DC boost circuit and the inverter circuit. The inverter circuit generally adopts a full-bridge structure, and there are many switching devices, which increases the cost of the system and the complexity of control. The space is larg...

AI Technical Summary

Problems solved by technology

In 2002, Peng Fangzheng proposed the Z-source inverter, which solved some shortcomings of the traditional voltage source inverter. The Z-source inverter uses the controllable direct connection of the upper and lower bridge arm power switch tubes to increase the DC bus voltage on the input side of the inverter. , so as to increase the output AC voltage, but this inverter topology is more complex, there is a start-up shock oscillation, the DC bus voltage is lower than the capacitor voltage, and the voltage gain is limited by the direct duty cycle and modulation ratio, etc., which is far from practical application. for further study

Its disadvantage is that the starting point of the inverter is to reduce the leakage current in the voltage conversion of the photovoltaic array. There are many switching devices, which increases the volume of the circuit, and 2 / 3 of the switching devices work at high frequency. The performance requirements of switching devices are high, and the loss is large, which reduces the efficiency of the inverter

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