Inverter system based on low-pass filtering

Abstract

The invention discloses an inverter system based on low-pass filtering. The inverter system is composed of a transformer T1, an inverter circuit and a grounding logic control circuit connected with the inverter circuit and is characterized in that a low-pass filtering circuit is arranged between the primary side of the transformer T1 and the logic control circuit; the low-pass filtering circuit is composed of an amplifier P1, a triode VT4, a capacitor C3, a capacitor C4, a resistor R8 and a capacitor C1; the negative electrode of the capacitor C3 is connected with the output end of the amplifier P1 and the positive electrode is connected with the base electrode of the triode VT4; the capacitor C4 is connected in parallel with the capacitor C3; one end of the resistor R8 is connected with the dotted terminal of an electric inductance coil L1 at the primary side of the transformer T1 and the other end is grounded via a resistor R7; the negative electrode of the capacitor C1 is connected with the inverse-phase input end of the amplifier P1 and the positive electrode is connected with the logic control circuit. The low-pass filtering circuit is arranged, so that the inverter system protects electric equipment from being damaged by third harmonic waves when large-load electric equipment is driven.

Description

technical field [0001] The invention relates to the field of electronics, in particular to an inverter system based on low-pass filtering. Background technique [0002] Inverters convert DC power into AC power. It is widely used in air conditioners, home theaters, electric grinding wheels, electric tools, sewing machines, DVD, VCD, computers, TVs, washing machines, range hoods, refrigerators, VCRs, massagers, fans, lighting, etc. In foreign countries, due to the high penetration rate of automobiles, the inverter can be used to connect the battery to drive electrical appliances and various tools to work when going out to work or travel. Connect household appliances to the output of the power converter to use various appliances in the car. [0003] However, when the inverter is used, because the load is too large, the third harmonic component contained in the square wave current will increase the capacitive current flowing into the load, and in severe cases, it will damage t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the current inverter when the load is too large, the third harmonic component contained in the square wave current will increase the capacitive current flowing into the load, and will damage the power supply filter capacitor of the load in severe cases defects, providing an inverter system based on low-pass filtering

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