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.