Ballast circuit and gas discharge lamp

Abstract

Applicable to the field of electric illumination, the invention provides a ballast circuit and a gas discharge lamp. The ballast circuit comprises a transformer, a capacitor and a trigger; the primary winding of the transformer is connected with an alternating-current power supply, and the secondary winding of the transformer is connected with the lamp; the capacitor is connected in series between the primary winding and the secondary winding of the transformer; the trigger is connected in series between the secondary winding of the transformer and the ground; the trigger converts the voltage signals outputted by the secondary winding of the transformer into high-voltage pulse signals which are outputted to the lamp; and the transformer is a leakage step-up autotransformer. Since the ballast circuit adopts the leakage step-up autotransformer and the capacitor connected in series between the primary winding and the secondary winding of the transformer, the power factor of the circuit is increased, the working voltage range of the circuit is broadened, and the capability of controlling the stability of the lamp is enhanced.

Description

technical field [0001] The invention belongs to the field of electric lighting, in particular to a ballast circuit and a gas discharge lamp. Background technique [0002] In the case of low power supply voltage (110V / 120V), or to obtain a high open circuit voltage so that the lamp can be started directly, and under the condition of low power (less than 175W), the existing ballasts for high-pressure gas discharge lamps generally use High-impedance self-coupling step-up ballast: a compensation capacitor is connected in parallel with the primary winding of the transformer, and the requirements for the compensation capacitor are relatively low. The selection of the core air gap and working capacitor of the transformer in the ballast is relatively easy; however When the ballast is working, the voltage and current crest factors are high, and the ability to control the stability of the lamp is poor. Contents of the invention [0003] The purpose of the embodiments of the present...

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Problems solved by technology

[0003] The purpose of the embodiments of the present invention is to provide a ballast circuit, aiming to solve the problem of poor stability of the control lamp caused by the high peak factor of the current and voltage when the existing ballast circuit is in operation

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