A buck high-frequency isolated five-level inverter

Abstract

The invention provides a high-frequency isolation type five-level inverter which is composed of an input direct-current power source, a partial pressure capacitor, a Buck high-frequency isolation five-level conversion unit, a high-frequency isolation transformer, a cycle converter, an output filter and an output alternating-current load. The positive electrode and the negative electrode of the input direct-current power source are connected with the positive electrode and the negative electrode of the partial pressure capacitor respectively. The positive electrode of the partial pressure capacitor is connected with the positive electrode of the Buck high-frequency isolation five-level conversion unit, the negative electrode of an input capacitor is connected with the negative electrode of the Buck high-frequency isolation five-level conversion unit, and the output end of the Buck high-frequency isolation five-level conversion unit is connected with a primary winding of the high-frequency isolation transformer. A secondary winding of the high-frequency isolation transformer is connected with the input end of the cycle converter. The output end of the cycle converter is connected with the input end of the output filter. The output end of the output filter is connected with the output alternating-current load. According to the high-frequency isolation type five-level inverter, the voltage stress of an inverter switching tube can be remarkably reduced, and high-frequency electric isolation is achieved between the alternating-current load and the direct-current power source.

Description

technical field [0001] The invention belongs to the technical field of power electronic conversion, in particular to a Buck high-frequency isolated five-level inverter. Background technique [0002] Direct-to-AC DC-AC conversion technology is a conversion technology that uses power semiconductor devices to convert DC power into constant-voltage and constant-frequency AC power, referred to as inverter technology. It is widely used in national defense, industrial and mining enterprises, scientific research institutes, university laboratories and daily life. With the development and application of new energy technology, the application of inverter technology in new energy is also increasing. [0003] Conventional inverter technology usually adds a first-class power frequency transformer between the inverter and the output to adjust the voltage ratio and serve as electrical isolation, but the power frequency transformer has the characteristics of large volume, audio noise, poor...

AI Technical Summary

Problems solved by technology

It only reduces the voltage stress of the switch tube in the DC / DC converter with high-frequency electrical isolation, but does not really realize multi-level at the front end of the output filter inductor, and does not reduce the voltage stress of the switch tube. The output filter inductor capacitance value have not been reduced

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