Electronic ballast

Abstract

The invention discloses an electronic ballast. The electronic ballast comprises a square-wave generator, a transformer, a resonant circuit, and at least one control driving circuit, wherein the square-wave generator comprises a plurality of switch elements, the switch elements achieve breakover alternately and are used for converting direct current input voltage into square-wave alternating voltage and outputting the square-wave alternating voltage, the transformer comprises a drive winding, a plurality of control windings, and as least one induction winding, the drive winding, the control windings and the at lease one induction winding are mutually coupled, the plurality of the control windings are electrically connected with control ends of the plurality of switch elements respectively to control the plurality of switch elements to achieve breakover alternately, the resonant circuit and the drive winding form a resonant loop, the resonant circuit is electrically connected with an output end of the square-wave generator to drive a luminous element, and the at least one control drive circuit is connected with two ends of the induction winding in parallel and is used for receiving a control signal to control voltages of the two ends of the induction winding to control breakover time of at least one switch element. The invention provides the electronic ballast which is controllable in working frequency to stabilize working current or working power of the luminous element.

Description

technical field [0001] The invention relates to ballast technology, in particular to an electronic ballast capable of controlling the working current and power of light-emitting elements. Background technique [0002] At present, compared with electromagnetic ballasts, electronic ballasts have the advantages of high efficiency, light weight, no flicker, and no audible noise, so they are widely used. Among various electronic ballasts that drive light-emitting elements (such as fluorescent lamps), self-excited electronic ballasts are relatively simple and cost-effective electronic ballasts. [0003] However, the self-excited electronic ballast has the following problems. In the self-excited circuit, due to the limitation of its own circuit structure, the operating frequency of the self-excited resonant circuit is determined by the load, so it is difficult to control the output voltage and output current of the self-excited electronic ballast, and it is difficult to control th...

AI Technical Summary

Problems solved by technology

In the self-excited circuit, due to the limitation of its own circuit structure, the operating frequency of the self-excited resonant circuit is determined by the load, so it is difficult to control the output voltage and output current of the self-excited electronic ballast, and it is difficult to control the operating current of the light-emitting element or power

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