Electrical ballast capable of reducing impact on power grid voltage waveform distortion

Abstract

The invention discloses an electrical ballast capable of reducing the impact on power grid voltage waveform distortion. The electrical ballast capable of reducing the impact on power grid voltage waveform distortion comprises a rectifying circuit, a chopper circuit and an inverter circuit; the rectifying circuit is used for rectifying alternating current electric supply, and the output of the rectifying circuit is input to the inverter circuit after being processed by the chopper circuit. The electrical ballast capable of reducing the impact on power grid voltage waveform distortion is characterized in that the chopper circuit is used for realizing the chopping close to the peak value of the alternating current voltage, so that a ballast-type electronic device does not take energy from the vicinity of the alternating current peak value so as to reduce the impact on the power grid voltage waveform distortion; the chopper circuit consists of a voltage comparison circuit and an electronic switch circuit. According to the electrical ballast disclosed by the invention, the electronic switch circuit is at a closed state in the process that the voltage in a power grid increases gradually from 0, and the electric energy is output; when the electronic switch circuit is at a part close to the wave peak and the wave trough of the power grid voltage, the electronic switch circuit is at a disconnection state, and a chopping effect is played, and the electric energy is not output; the harmonic component injected into the power grid voltage is reduced; the power grid voltage waveform distortion is reduced; the quality of the power grid electric energy is improved.

Description

technical field [0001] The present invention relates to an electronic ballast, and more specifically, to an electronic ballast that utilizes the energy on both sides of the peak value of the alternating current to reduce rectification electronic equipment from obtaining energy from the vicinity of the peak value of the alternating current, thus reducing the influence on the distortion of the grid voltage waveform. ballast. 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, a...

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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