Circuit of light-adjustable ballast with fluorescent tube resistance feedback network

Abstract

The invention discloses a dimmable ballast circuit with a lamp tube resistance feedback network, comprising an anti-electromagnetic interference filter (1), a rectification circuit (2), and a power factor correction circuit (3), which are sequentially connected to a voltage control circuit The oscillator (4); the dimmer (5) is connected to the dimming circuit (6) and then connected to the voltage-controlled oscillator (4) through the attenuation circuit (7); the voltage-controlled oscillator (4) is then connected to the LC resonant circuit (8 ) is connected to the lamp tube (9); the other end of the lamp tube (9) is also connected with a lamp tube resistance feedback network (10). The advantage of the present invention is that it overcomes the defect that fluorescent lamps in the prior art cannot work normally under the darkest setting of the dimmer and low temperature environment (below 5°C), so that the fluorescent lamp using this circuit can be used even when the setting of the dimmer is the lowest. It can also be ignited normally and work reliably in dark and low temperature environments (around 0°C).

Description

Technical field [0001] The invention relates to a dimmable ballast circuit, in particular to a dimmable ballast circuit with a lamp tube resistance feedback network. Background technique [0002] The existing dimmable ballast circuit usually includes an anti-electromagnetic interference filter, a rectifier circuit, and a power factor correction circuit, which are sequentially connected to a voltage-controlled oscillator; the dimmer is connected to the dimming circuit and is connected to the voltage-controlled oscillator after the attenuation circuit The voltage controlled oscillator is connected to the lamp tube through the LC resonant circuit. In this way, under normal circumstances, the fluorescent lamp using this circuit can work normally, but in the darkest and low temperature environment (below 5℃) with the dimmer, it is difficult for the fluorescent lamp using this circuit to work normally, or even unable to ignite . Summary of the invention [0003] The technical problem ...

AI Technical Summary

Problems solved by technology

In this way, under normal circumstances, fluorescent lamps using this circuit can work normally, but in the darkest setting of the dimmer and in a low-temperature environment (below 5°C), it is difficult for fluorescent lamps using this circuit to work normally, and even cannot be ignited

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