Inverter circuit, inverter and control method and device of inverter circuit

Abstract

The embodiment of the invention discloses an inverter circuit, an inverter and a control method and device of the inverter circuit, which are used for solving the bridge arm direct connection problemof the inverter circuit. The inverter circuit comprises an inverter module and a filter module which are connected in sequence; the inverter module comprises a first bridge arm which comprises a firstswitching tube, a first inductor, a second inductor and a second switching tube which are connected in series in sequence; a second bridge arm which comprises a third switching tube and a first diodewhich are connected in series, wherein the collector of the third switching tube is connected with the neutral point, the emitter of the third switching tube is connected with the anode of the firstdiode, and the cathode of the first diode is connected with the first node; a third bridge arm which comprises a fourth switch tube and a second diode which are connected in series, wherein the emitter of the fourth switch tube is connected with the neutral point, the collector of the fourth switch tube is connected with the cathode of the second diode, and the anode of the second diode is connected with the second node; a first freewheeling branch; and a second freewheeling branch.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an inverter circuit, an inverter and a control method and device for the inverter circuit. Background technique [0002] With the rapid development of power electronics technology, inverters have been widely used in uninterruptible power supplies, new energy power generation, frequency converters, electric vehicles and many other fields, and are developing towards high reliability, high power density and high efficiency. [0003] Such as figure 1 As shown, in the traditional inverter circuit, the inverter bridge arm composed of the switching tube Q1 and the switching tube Q4 is connected between the positive bus and the negative bus, and the inverter bridge arm composed of the switching tube Q2 and the switching tube Q3 has one end connected to the The neutral point is connected, and the other end thereof is connected with the midpoint of the inverter bridge arm formed...

AI Technical Summary

Problems solved by technology

[0004] In view of this, in the prior art, the problem of bridge arm direct connection of the inverter circuit is usually solved by setting the dead time, but on the one hand, the setting of the dead time will increase the output voltage harmonics and affect the output power quality; on the other hand, even if the setting If the dead time is exceeded, due to some interference or the failure of the switching tube device, it will still cause the bridge arm of the inverter circuit to pass through.

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