초록 ▼

A fluorescent lamp operating device having a power supply, a circuit for converting the output power from the power supply into a high-frequency power, a lighting circuit connected to a secondary side of a transformer of the high-frequency power converter circuit to light a fluorescent lamp, a circu

A fluorescent lamp operating device having a power supply, a circuit for converting the output power from the power supply into a high-frequency power, a lighting circuit connected to a secondary side of a transformer of the high-frequency power converter circuit to light a fluorescent lamp, a circuit for preheating the filament of the fluorescent lamp, a switch circuit including diodes and at least one transistor connected in series with the fluorescent lamp in the lighting circuit, and a control circuit for turning off the transistor for a predetermined period when the power supply is turned on thereby turning off the lighting circuit to actuate the preheating circuit during this period. The control circuit turns on the transistor at the end of the predetermined period to thereby actuate the lighting circuit.

대표청구항 ▼

A fluorescent lamp operating device comprising: a power supply; a high-frequency power converter circuit for converting the output power from said power supply into a high frequency power and including a transformer; a lighting circuit operatively connected to a secondary side of said transformer fo

A fluorescent lamp operating device comprising: a power supply; a high-frequency power converter circuit for converting the output power from said power supply into a high frequency power and including a transformer; a lighting circuit operatively connected to a secondary side of said transformer for lighting a fluorescent lamp; a preheating circuit operatively connected to said secondary side of said transformer for continuously preheating the filament of said fluorescent lamp while said power supply is turned on; a switch circuit including diodes and a transistor circuit operatively inter-connected, said switch circuit being provided in said lighting circuit and being connected in series with said fluorescent lamp; and a control circuit for turning off said lighting circuit for a predetermined period by first turning off said transistor circuit during said predetermined period in response to the turn-on of said power supply thereby actuating said preheating circuit to preheat the filament during said predetermined period prior to actuating said lighting circuit, said control circuit turning on said transistor circuit at the end of said predetermined period thereby actuating said lighting circuit.