Topological structure of switch inductance inverted-L-shaped Z-source inverter

Abstract

Provided is a topological structure of a switch inductance inverted-L-shaped Z-source inverter. The topological structure comprises a direct-current power supply and an inverter bridge and is characterized in that an inverted-L-shaped Z-source network with a switch inductance unit is additionally arranged between the direct-current power supply and the inverter bridge, namely the front end of the inverter bridge is connected with the inverted-L-shaped Z-source network with the switch inductance unit. The topological structure has the advantages that capacitor voltage stress in the Z-source network always maintains twice the voltage of the direct-current power supply in the process that voltage of the inverter is amplified; the situation that capacitor voltage stress of a traditional Z-source inverter increases with a through duty ratio is avoided; compared with the traditional Z-source inverter and the switch inductance Z-source inverter, the inverter reduces inductance current stress on the condition of identical voltage gains; voltage gain obtained when the through duty ratio is small is improved; influences of impact currents on the inverter bridge can be avoided when the system is started.

Description

technical field [0001] The invention relates to a topological structure of a switched inductance Γ-type Z-source inverter. Background technique [0002] There are many topological structures of existing Z-source inverters, such as: figure 2 The conventional Z-source inverter shown, such as image 3 The quasi-Z source inverter shown, such as Figure 4 The switched inductor Z source inverter is shown and as Figure 5 The quasi-switched inductance shown in Z source inverter and so on. from Figure 2-5 It can be seen that, in addition to the inductor, all the above Z-source inverters contain two capacitive elements, and the voltage stress of the capacitor increases with the increase of the direct duty cycle. Due to the large range of capacitor voltage stress changes, this will reduce the service life of the capacitor and limit the size of the through duty cycle; there may be inrush current when the system starts; in addition, the inductor current stress in the above Z-sourc...

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Problems solved by technology

Due to the large range of capacitor voltage stress changes, this will reduce the service life of the capacitor and limit the size of the through duty cycle; there may be inrush current when the system starts; in addition, the inductor current stress in the above Z-source inverter is relatively large

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