Inverter for cold cathode fluorescent lamps

Abstract

The invention relates to an inverter for cold cathode fluorescent lamps, which comprises a filter circuit and a rectifier circuit connected with the filter circuit, wherein the rectifier circuit is connected with a control and half-bridge integrated circuit; and a half-bridge driving chip is connected with a boosted circuit. In the inverter for cold cathode fluorescent lamps, the circuit adopts integrated intelligent IC management, a high performance transformer and other solutions so as to realize quick preheating, triggering and operation; the circuit also comprises an EMI filter and a rectifier stage. The circuit half-bridge driving chip adopts IMP3521, IMP3522 or IMP3523. The preheating time is adjustable, and the operating frequency can be set to change the lamp power, thereby avoiding the soft startup of lamp flickering at high starting frequency, protecting the circuit in case of open circuit of filament and trigger failure; and the inverter can automatically restart after the low line voltage input protection and voltage rise. By optimally matching high performance CCFL lamp tube design, the power supply has the advantages of high efficiency, long service life, intelligent adjustment, abnormity protection, low electromagnetic interference and the like; and the circuit is simple and compact, and has high cost performance.

Description

technical field [0001] The invention relates to an inverter, in particular to an inverter for cold cathode fluorescent lamps. Background technique [0002] The current inverters for cold cathode fluorescent lamps generally use discrete components, which consume a lot of power and generally have low efficiency; discrete component inverters warm up slowly and generate large electromagnetic interference. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an inverter for cold-cathode fluorescent lamps which is suitable for cold-cathode fluorescent lamps, has fast warm-up, intelligent adjustment, abnormal protection, low electromagnetic interference, and long service life. [0004] The object of the present invention is achieved in the following way: an inverter for cold cathode fluorescent lamps, comprising a filter circuit, a rectifier circuit connected to the filter circuit, the rectifier circuit connected to a half-b...

AI Technical Summary

Problems solved by technology

[0002] The current inverters for cold cathode fluorescent lamps generally use discrete components, which consume a lot of power and generally have poor efficiency; discrete component inverters warm up slowly and generate large electromagnetic interference.

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