Phase-shift processing based low-pass filtering inverter system

Abstract

The invention discloses a phase-shift processing based low-pass filtering inverter system. The inverter system mainly comprises a transformer T1, an inverter circuit, a logic control circuit and a low-pass filtering circuit, wherein the logic control circuit is connected with the inverter circuit, and the low-pass filtering circuit is connected with a primary side of the transformer T1. The inverter system is characterized in that a phase-shift processing circuit is further arranged between the logic control circuit and the band-pass filtering circuit and comprises a phase-shift chip U1, a triode VT4, a triode VT5, a resistor R7, a polar capacitor C1 and the like, wherein one end of the resistor R7 is connected with a VCC+ pin of the phase-shift chip U1 while the other end of the resistor R7 is connected with an IN1 pin of the phase-shift chip U1, and a cathode of the polar capacitor C1 is connected with the IN1 pin of the phase-shift chip U1 after passing by a resistor R6 while an anode of the polar capacitor C1 is connected with an IN2 pin of the phase-shift chip U1. By the aid of the phase-shift processing circuit, good stability of the inverter system can be kept when the inverter system drives heavy-load electric equipment.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a low-pass filter inverter system based on phase-shifting processing. 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 c...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that when the load of the current inverter 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 the power filter pole of the load. To overcome the defects of permanent capacitors, a low-pass filter inverter system based on phase-shifting processing is provided

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