Fluorescent lamp and open circuit protecting circuit thereof

Abstract

The invention is applied to the field of electronic illumination and provides a fluorescent lamp and an open circuit protecting circuit thereof. The open circuit protecting circuit of the fluorescent lamp comprises a rectifier filtering unit, a dividing unit and a half-bridge suppression unit. According to the fluorescent lamp and the open circuit protecting circuit thereof disclosed by the invention, a high-voltage direct current signal output by a self-exciting half bridge circuit of the fluorescent lamp is sampled, rectified and filtered by the rectifier filtering unit and is divided by the dividing unit for providing a trigger electrical signal for the half-bridge suppression unit; the triggered half-bridge suppression unit enters a work state to suppress the self-exciting half bridge circuit of the fluorescent lamp to work and enable the self-exciting half bridge circuit to stop oscillation, and thus the aim that the high-voltage electric shock risk is eliminated because no voltage is output from the output end of the self-exciting half bridge circuit of the fluorescent lamp when the fluorescent lamp is in open circuit or no fluorescent lamp body is connected is achieved.

Description

technical field [0001] The invention belongs to the field of electronic lighting, in particular to a fluorescent lamp and an open circuit protection circuit thereof. Background technique [0002] At present, self-ballasted fluorescent lamps, as a commonly used lamp, have been widely used in people's daily life. [0003] Most existing self-ballasted fluorescent lamp circuits have simple structures and low manufacturing costs. Self-ballasted fluorescent lamps usually include a fluorescent lamp body and a fluorescent lamp self-excited half-bridge circuit. The protection circuit is not perfect. However, when the fluorescent lamp self-excited half-bridge circuit is open-circuited or no fluorescent lamp body is connected, the output voltage of the fluorescent lamp self-excited half-bridge circuit is several times the normal operating voltage, which can reach hundreds of volts, while the fluorescent lamp self-excited half-bridge circuit The high voltage output will lead to the da...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an open-circuit protection circuit for fluorescent lamps, aiming to solve the problem of high-voltage electric shock hazards in the existing self-ballasted fluorescent lamps when they are open-circuited or no energy-saving lamps are connected.

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