Dual-circuit different-frequency power supply circuit for gas discharge lamp

Abstract

The invention provides a dual-circuit different-frequency power supply circuit for a gas discharge lamp, which supplies power to a lamp tube by a power-frequency high-current power supply and a high-frequency low-current power supply which are connected in parallel and is composed of a power factor compensation capacitor C1, a rectifying inductor E, a filter capacitor C2 and a high-frequency power generating circuit F. As the rectifying inductor E does not need to supply starting excitation high-voltage to the lamp tube, a pure inductance rectifier can be selected; and when the lamp tube is subject to normal lighting, the operating voltage of the inductance rectifier is close to mains voltage, thus improving utilization ratio of electric energy. When the lamp tube is started and subject to normal lighting, the power of the high-frequency power generating circuit F is less than 50W, and the frequency of the generating circuit is designed as 2.5MHz-3MHz which is more favorable for exciting free electrons in the lamp tube, improving lighting effect and protecting electrodes. The output power of the whole circuit is controlled by adjusting the size of an inductor L1 and an inductor L2. The dual-circuit different-frequency power supply circuit adopts a symmetrical design to reduce electromagnetic interference.

Description

technical field [0001] The invention relates to an electronic rectifier circuit for a gas discharge lamp. Background technique [0002] Gas discharge lamps include high-pressure sodium lamps, high-pressure mercury lamps, metal halide lamps, xenon lamps, fluorescent lamps, etc. At present, the rectifiers that match these lamps on the market can be divided into two types, one is an inductive rectifier, and the other is an electronic rectifier. . They all use a single power supply to power the gas discharge lamp, and there are insurmountable defects in the actual use process. [0003] The power factor of the inductance rectifier is not high, and its own consumption accounts for 4% to 10% of the total energy consumption. To improve the power factor of the inductance rectifier, although the capacitance compensation method can be adopted to overcome it, the nearby compensation will affect the life of the lamp, so the individual current is large, the input wire must be thick, and...

AI Technical Summary

Problems solved by technology

[0005] Therefore, whether the rectifiers used in the existing gas discharge lamps are inductive rectifiers or electronic rectifiers, they all have their own inherent defects and difficult technical problems.

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