High-power factor electronic ballast of high-intensity gas discharging lamp

Abstract

The invention discloses a high-power factor electronic ballast of a high-intensity gas discharging lamp, comprising a filtering rectifying circuit, a power factor correction and booster circuit, an auxiliary power source circuit, a sampling circuit, an inversion circuit, an oscillation drive circuit, a constant power control circuit, a resonant circuit and a protection circuit. A sampling circuitcollects an output voltage signal of the power factor correction and booster circuit and a current signal of the high-intensity gas discharging lamp; the inversion circuit is coupled with a first output end of the sampling circuit; the constant power control circuit comprises a magnet amplifier, a magnet amplifier control circuit and a power supply circuit; a primary winding of the magnet amplifier is connected in series with the resonant circuit; and one end of a control winding is coupled with the magnet amplifier control circuit, while the other end is coupled with the power supply circuit; the magnet amplifier control circuit controls the current flowing by the control winding to change in inverse proportion to the lamp current according to a control electric signal which is in positive proportion to the sampling lamp current and is output by a second output end of the sampling circuit. The invention simplifies the circuit structure and has low cost.

Description

technical field [0001] The invention relates to an electronic ballast for a high-intensity gas discharge lamp. Background technique [0002] High-intensity gas discharge lamps have many advantages such as high luminous efficiency, long life, high power, and low price. They are especially suitable for stations, docks, squares, road traffic, etc. Optimal electric light source for area lighting. However, the power factor of traditional magnetic ballasts is very low, and the reactive power loss is huge, while the power factor of general electronic ballasts is not high (PF<0.98), and the harmonic content (THD) also exceeds the standard (THD>10%) , although some electronic ballasts use single-chip microcomputers for constant power control, there are many defects such as complex circuits, poor reliability and high prices. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an electronic ballast with simple circuit, ...

AI Technical Summary

Problems solved by technology

However, the power factor of traditional magnetic ballasts is very low, and the reactive power loss is huge, while the power factor of general electronic ballasts is not high (PF10%) At present, although some electronic ballasts use single-chip microcomputers for constant power control, there are many defects such as complex circuits, poor reliability and high prices.

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