Road lamp electric ballast

Abstract

The invention provides an electronic ballast of street lamps, comprising: a power input circuit, an electromagnetic interference process circuit, a rectifier filter circuit, an inversion driving circuit, an inversion circuit and a frequency drift circuit. The frequency drift circuit is used for adjusting output frequency of the inversion driving circuit so as to put the working frequency of the inversion circuit in a periodical changeable state. The output frequency of the inversion driving circuit is adjusted by the frequency drift circuit as the frequency drift circuit is installed in the electronic ballast to solve the resonance problem of lamp and sound of high pressure gas discharging. Thus, the high pressure gas discharging lamps using the electronic ballast are able to be widely applied in street lamps such that social energy is greatly saved.

Description

technical field [0001] The invention relates to an electronic ballast for a street lamp, in particular to an electronic ballast for applying a high-pressure gas discharge lamp to a street lamp. Background technique [0002] High-pressure gas discharge lamp (HID: High intensity Discharge), also known as heavy metal lamp or xenon lamp, mainly injects xenon gas (Xenon) into the quartz tube, and then instantly increases the low-voltage 220V AC to high-voltage 5000V through the ballast, thereby exciting The substance in the quartz tube makes it glow in the arc, and the super-strong white arc light generated is similar to the sunlight in the daytime. Since it does not have a filament, it will not cause the problem of filament breakage and scrapping, and it is compared with the existing Some halogen lamps, in addition to having a long service life, can further increase the penetration and illuminance. If they are equipped with electronic ballasts with good performance, the power co...

AI Technical Summary

Problems solved by technology

[0003] However, when the high-pressure gas discharge lamp is lit, the low-voltage 220V power needs to be instantly increased to the high-voltage 5000V, so the high-pressure gas discharge lamp cannot be used alone. It must be started by a ballast and maintain the stability and continuity of the light. There are usually two types of ballasts: electronic and inductive. Electronic ballasts are more superior in terms of energy saving and consumption reduction, and will replace magnetic ballasts. Electronic ballasts usually include rectification and filtering circuits, inverter drive circuits and inverter circuits. , the input AC power is converted into a DC power supply through a rectification and filtering circuit, and then converted into a high-voltage AC power supply through an inverter drive circuit and an inverter circuit, thereby starting a high-pressure gas discharge lamp and maintaining a lighted state after being lit. However, the existing The high-frequency oscillating voltage generated by the electronic ballast of the high-pressure gas discharge lamp is often in phase with the reflected wave on the inner wall of the discharge lamp, resulting in a standing wave in the discharge lamp, which is the so-called "acoustic resonance" phenomenon, which is harmful to the lamp Within a few minutes after being triggered and ignited, the working current increases sharply, making the discharge arc unstable and out of control, and the arc is extinguished immediately

In this way, after many times of repeated ignition, the electronic ballast will eventually be burned or the discharge lamp will be damaged, especially when this kind of electronic ballast and discharge lamp are applied to street lamps. The resonance problem will greatly affect the traffic, so that the application of this kind of energy-saving electronic ballast in the high-pressure gas discharge lamp (HID) has not been promoted

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