Switch boosting type quasi-z source inverter

Abstract

The invention discloses a switch boosting type quasi-z source inverter which comprises a first switch tube, a first capacitor, a first inductor, a first diode and a second diode. The first end of thefirst inductor is connected with the anode of a power supply, the second end of the first inductor is connected with the first end of the first capacitor, and the first inductor is additionally arranged between the first capacitor and the power supply, so that when a circuit is started, the first inductor can delay current into the first capacitor, and thus, the starting current during starting ofthe circuit is reduced. In addition, a quasi-z boosting module comprises a second inductor, a third inductor, a second capacitor and a third capacitor, due to addition of the second and third capacitors, corresponding voltage stress is distributed to the second and third capacitors, and finally, the voltage stress on the first, second and third capacitors independently is lower.

Description

technical field [0001] The invention relates to the field of electronic power supplies, in particular to a switching boost type quasi-z source inverter. Background technique [0002] With the increasing amount of new energy connected to the grid, the use of renewable energy such as photovoltaic power generation has been more and more popularized. The DC voltage that can be released by a single solar cell is low. On the one hand, it cannot meet the needs of existing electrical equipment. On the other hand, when it supplies power to the DC side of the inverter, the output AC voltage is small, which cannot meet the needs of the inverter for grid connection. The AC voltage demand of the grid-connected output. Based on this, the traditional method often connects multiple solar cells in series to increase the voltage level to meet the voltage requirements when the electrical equipment and the inverter are connected to the grid, but this method will greatly increase the size of th...

AI Technical Summary

Problems solved by technology

The DC voltage that can be released by a single solar cell is low. On the one hand, it cannot meet the needs of existing electrical equipment. On the other hand, when it supplies power to the DC side of the inverter, the output AC voltage is small, which cannot meet the needs of the inverter for grid connection. The AC voltage demand of grid-connected output

Based on this, the traditional method often connects multiple solar cells in series to increase the voltage level to meet the voltage requirements when the electrical equipment and the inverter are connected to the grid, but this method will greatly increase the size of the power supply system, and also Need to solve the voltage equalization problem of series batteries

[0003] The switching boost quasi-z source inverter proposed in recent years is a high-gain conversion circuit, which solves the problems of the above-mentioned common inverters, such as figure 1 , figure 1 It is a schematic diagram of the circuit structure of a traditional switching boost quasi-z source inverter in the prior art, including: a power supply, a full-bridge inverter bridge module, a switching boost module and a filter module. figure 1 With this circuit structure, the voltage stress on the capacitor C1 in the circuit is relatively large, and there is a problem that the starting surge current is relatively large when the circuit is started.

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