Phase-shift processing based low-pass filtering inverter system
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A low-pass filtering and phase-shifting processing technology, which is applied in the electronic field, can solve the problems of increasing and damaging the polarity capacitance of the power supply filter, and achieve the effect of improving load capacity, simple structure, and good stability
Inactive Publication Date: 2015-03-11
CHENGDU CHUANGTU TECH
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[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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[0017] Such as figure 1 As shown, the low-pass filter inverter system based on phase-shift processing of the present invention mainly consists of a transformer T1, an inverter circuit, a logic control circuit connected to the inverter circuit, and a low-pass filter connected to the primary side of the transformer T1 The circuit is composed of a phase-shift processing circuit between the logic control circuit and the low-pass filter circuit.
[0018] The phase-shifting processing circuit is composed of a phase-shifting chip U1, a transistor VT4, and a transistor VT5. One end is connected to the VCC+ pin of the phase-shifting chip U1, the other end is connected to the IN1 pin of the phase-shifting chip U1, and the negative electrode After resistor R6, it is connected to the IN1 pin of the phase shifting chip U1, the positive pole is connected to the IN2 pin of the phase shifting chip U1, and the positive pole is connected to the NC pin of the phase shifting chip U1 after passing...
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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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