Electronic ballast

Abstract

An electronic ballast comprises an input filter, a DC-DC flyback converter and a DC-AC full-bridge inverter circuit which are connected in turn in a cascade manner, wherein the front end of the input filter is connected with an accumulator battery, a sustained arc circuit and a multivoltage parallel structure firing circuit are in parallel connection on the DC-AC full-bridge inverter circuit; the multivoltage parallel structure firing circuit comprises a multivoltage circuit, a booster circuit, a high voltage barrier diode and a relay; the output end of the multivoltage circuit is connected with the sustained arc circuit and the booster circuit; and the booster circuit is in parallel connection with the high voltage barrier diode and a high pressure gas discharge lamp, and the high pressure gas discharge lamp and the relay are in connection. The beneficial effects of the invention are as follows: the volume of the ignition transformer is reduced, the overall efficiency of the electronic ballast of the high pressure gas discharge lamp is increased; the voltage value of the storage capacitor in the sustained arc circuit is increased so as to more effectively complete the function of arc maintenance and increase the primary ignition success rate of the high pressure gas discharge lamp; and the overall cost is reduced.

Description

technical field [0001] The invention relates to an electronic ballast for a high-pressure gas discharge lamp. Background technique [0002] Electronic ballasts for high-pressure gas discharge lamps include a high-voltage ignition circuit and a steady-state power supply circuit. The ignition circuit and steady-state power supply circuit can generally be connected in series or in parallel. The steady-state power supply circuit includes a DC boost circuit and a full-bridge inverter circuit. The high-voltage generating circuit of the ignition circuit generally has a single-stage boost circuit and a double-stage boost circuit. [0003] A single-stage boost circuit connected in series, such as figure 1 As shown, this circuit generally requires a high turn ratio. Because the high-voltage coil flows the lamp current, the wire used should not be too thin, which will make the volume of the high-voltage transformer large. [0004] A single-stage boost circuit connected in parallel, ...

AI Technical Summary

Problems solved by technology

[0007] The invention solves the problem of low efficiency of the voltage doubling serial ignition circuit of the existing electronic ballast, and provides an electronic ballast with high efficiency and compact structure

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