A kind of inverter and method for controlling inverter

Abstract

The embodiment of the invention discloses an inverter, which comprises a power supply, an inverter circuit and a filter circuit; the inverter circuit comprises a first switching transistor, a second switching transistor, a third switching transistor and a fourth switching transistor which are connected in series between the anode and cathode of the power supply; the common end of the second switching transistor and the third switching transistor is a third node; the common end of the first switching transistor and the second switching transistor is a first node, and the common end of the third switching transistor and the fourth switching transistor is a second node; a fifth switching transistor is connected between the anode of the power supply and the third node; a sixth switching transistor is connected between the third node and the cathode of the power supply; a first diode is connected between the first node and a central line; a second diode is connected between the second node and the central line; and the third node is connected with the central line through the filter circuit. The embodiment of the invention also provides an inverter control method. Due to the adoption of the embodiment of the invention, the switching loss and conduction loss of the power elements can be effectively reduced, thus helping to increase circuit efficiency.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an inverter and a method for controlling the inverter. Background technique [0002] At present, in the field of power electronics, PWM (Pulse Width Modulation, pulse width modulation) inverters are widely used, especially for UPS (Uninterruptible Power System, uninterruptible power supply), solar inverters, wind energy converters , motor drives, and fuel cells. The commonly used inverters in the industry are two-level inverters and three-level inverters. [0003] The two-level inverter is mainly controlled by pulse width modulation, and outputs an output voltage based on two fixed levels, which has the advantages of low cost and simple control. But the two-level inverter has obvious defects, such as: the switch withstand voltage is the total input voltage, which makes the switch withstand voltage level higher, and the switch of the switch tube is very damaged, which ...

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Problems solved by technology

But the two-level inverter has obvious defects, such as: the switch withstand voltage is the total input voltage, which makes the switch withstand voltage level higher, and the switch of the switch tube is very damaged, which limits the frequency of PWM; at the same time, its output The voltage harmonic content is very rich, which leads to a large volume and loss of the output filter inductor

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