An Electronic Ballast for Reducing Grid Voltage Waveform Distortion Through Triac

Abstract

The invention discloses an electronic-type ballast for reducing the power grid voltage waveform distortion by bidirectional controllable silicon. The electronic-type ballast for reducing the power grid voltage waveform distortion by bidirectional controllable silicon comprises a rectifying circuit, a filter circuit, a contravariant driving circuit and a contravariant circuit. The electronic-type ballast for reducing the power grid voltage waveform distortion by bidirectional controllable silicon is characterized in that an input end of the rectifying circuit is provided with an electronic switch circuit; the electronic switch circuit is always at a disconnection state in the process that the power grid voltage changes from 0V to wave peak and wave trough, and the electronic-type ballast cannot acquire energy from the power grid; when the power grid voltage exceeds the parts close to the wave peak and wave trough, the electronic switch circuit is switched off, and the rectification-type electronic equipment can acquire energy from the power grid. According to the electronic-type ballast, rectification-type equipment only utilizes energy after the power grid voltage exceeds the wave peak and wave trough by controlling the moment in disconnecting and switching off an electronic switch circuit, avoids to utilize the energy of the power grid voltage peak value as well as the energy within the time interval close to the power grid voltage value, can effectively reduce 3rd harmonic component and 5th harmonic component injected into a power grid, reduces the power grid voltage waveform distortion, and improves the power grid electricity energy quality.

Description

technical field [0001] The present invention relates to an electronic ballast, and more specifically, to an electronic ballast that utilizes the energy on one side of the peak value of the alternating current to reduce rectification electronic equipment to obtain energy from the vicinity of the peak value of the alternating current, thereby reducing the distortion of the grid voltage waveform device. Background technique [0002] With the continuous improvement and improvement of the efficiency of electronic products and the rapid increase in the application of electronic electrical equipment in households, enterprises and institutions, many electronic electrical equipment need to convert alternating current into direct current. In a traditional rectifier circuit, only when the AC voltage is close to the peak value, the rectifier tube conducts the input current. The 3rd harmonic and 5th harmonic content of this pulse-shaped input current are large, and the greater the opera...

AI Technical Summary

Problems solved by technology

When these harmonics are superimposed on each other, it will seriously affect the waveform quality of the power grid, causing great damage to power supply equipment and electrical equipment

[0004] At present, the method of suppressing the harmonics generated by electronic ballasts mainly uses filters, but when the system impedance, frequency, load, etc. change, the filtering effect of the filter will be affected

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