Single-phase inverter used for high-voltage DC and switching circuit

Abstract

The invention belongs to the electric energy conversion technical field and discloses a single-phase inverter used for high-voltage DC and a switching circuit. The single-phase inverter comprises an anti-reverse protection circuit, a voltage reduction module, the switching circuit and a control circuit; the input end of the anti-reverse protection circuit is connected with an external input end; the output end of the anti-reverse protection circuit is connected with the voltage reduction module and the switching circuit; the output end of the voltage reduction module is connected with the control circuit; the control circuit outputs two paths of mutually-complementary PWM signals; the switching circuit comprises four field-effect transistors from Q1 to Q4 which are connected with each other through adopting a bridge structure; high and low electric level of the first paths of PWM signals directly drive the field-effect transistor Q4 to be switched on and switched off; a driving circuit with a bootstrap function can drive the field-effect transistor Q3 to be switched on and switched off; high and low electric level of the second paths of PWM signals directly drive the field-effect transistor Q2 to be switched on and switched off; and a driving circuit with a bootstrap function can drive the field-effect transistor Q1 to be switched on and switched off. The single-phase inverter of the invention has the advantages of simple circuit structure as well as being flexible, practical, safe and reliable.

Description

technical field [0001] The invention relates to the technical field of electric energy conversion, in particular to a conversion device for converting high-voltage direct current into alternating current, in particular to a single-phase inverter suitable for high-voltage direct current conversion. Background technique [0002] The inverter converts DC power into AC power (usually 220v / 50HZ sine or square wave). In layman's terms, an inverter is a device that converts direct current (DC) into alternating current (AC), generally including an inverter bridge, control logic and filter circuits, etc. It is widely used in our daily life, such as: computers, TVs, fans, lighting and cars, etc., but the inverters used in daily life are basically electronic devices that convert low-voltage (12V or 24V or 48V) direct current into 220V alternating current, and are controlled by transformer power, switching devices Due to the limitations of parameters and heat dissipation, the output po...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a single-phase inverter for the defects of the existing inverter technology, so as to solve the design defect that the above-mentioned inverter cannot realize high-voltage input and high-power output

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