What is a ballast factor and how does it affect fluorescent tubes? In the above, the lamp driving unit 800 comprises field effect transistors T1 and T2 for controlling the voltage supplied from the DC transformation and boosting unit 700 to supply the voltage for high frequency oscillation; resistors R11 and R12 and diodes D5˜D7 provided at the front stage of the field effect transistors T1 and T2, for preventing a voltage higher than a predetermined voltage from being applied to the field effect transistors T1 and T2; Zener diodes ZD1 and ZD2 for making the voltage through the field effect transistors T1 and T2 a constant voltage; a plurality of oscillation coils L1˜L3 that oscillate at high frequency according to the constant voltage from the Zener diodes ZD1 and ZD2 to generate a high frequency; a plurality of bulbs BULB1 and BULB2 for using the high frequency from the oscillation coils L1˜L2 through choke coils CT1 and CT2 to selectively turn on a plurality of lamps (fluorescent lamp, CF lamp, etc. Further, the CF lamp driving circuit unit 400 comprises a voltage divider 401 for dividing the DC power supplied from the DC transformation unit 200 into a lamp power and a circuit driving power, field effect transistors Q1 and Q2 for controlling a voltage of the circuit driving power supplied from the voltage divider 401 to provide it as a voltage for high frequency oscillation, a resistor R12 and diodes D7, D8 and D9 provided at the front stage of the field effect transistors Q1 and Q2, for preventing a voltage higher than a predetermined voltage from being applied to the field effect transistors Q1 and Q2, a triac TA2 for preventing line surge from being applied to the gates of the field effect transistors Q1 and Q2, Zenor diodes D12 and D13 for making the voltage through the field effect transistors Q1 and Q2 a constant voltage, a plurality of oscillation coils L3˜L5 that oscillate at high frequency according to the constant voltage produced by the Zener diodes D12 and D13 to generate a high frequency (25 Khz˜30 Khz), a bulb BULB for receiving the high frequency generated by the oscillation coils L3 and L4 through a choke coil CT to turn on the CF lamp, and diodes D14 and D15 and condensers C10 and C11 connected to one side of the bulb BULB, for removing a surge voltage occurring when the lamp is connected to the socket in order to protect the lamp and the socket. In addition, the DC transformer 103 in the photocell circuit unit 100 receives the power outputted from the power supply unit 101, makes smooth the voltage as a DC power, and then supplies the resulting power to the first and second amplifiers 105 and 107 and other circuits. In the lamp driving unit 800, the field effect transistors T1 and T2 are repeatedly turned on and off according to the DC power. As a result of the detection, if the detected temperature exceeds a predetermined temperature (105°), the thermistor switch 202 is automatically shut down. As you step up to a larger engine, your fuel efficiency normally drops (using more energy in lighting-speak) and performance increases (more light output in lighting-speak). Further, the diodes D10, D11, D15 and D16 and the condensers C10, C11, C14 and C15 connected between the oscillation coil L2 and the bulbs BULB1 and BULB2 offsets a surge voltage occurring when the lamp is connected to the socket, whereby flickering of the lamp is removed. The present invention relates to an electronic ballast of a high power factor for a compact fluorescent lamp (CFL), and more particularly, to an electronic ballast of a high power factor for a compact fluorescent lamp (CFL) capable of implementing a high power factor and turning on lamps of different capacitances (3W-26W) or selectively turning on two lamps having the same capacitance or one lamp, using one circuit, by replacing a switching transistor with a field effect transistor and separating a lamp power and a circuit driving power. & Terms of Use. The electronic ballast comprises a voltage divider for dividing a DC power inputted thereto into a lamp power and a circuit driving power, field effect transistors for controlling a voltage of the circuit driving power to provide it as a voltage for high frequency oscillation, a resistor and diodes for preventing a voltage higher than a predetermined voltage from being applied to the field effect transistors, Zenor diodes for making the voltage through the field effect transistors a constant voltage, a bulb for receiving a high frequency generated by oscillation coils through a choke coil to turn on the CF lamp, and diodes and condensers for removing a surge voltage occurring when the lamp is connected to the socket in order to protect the lamp and the socket.



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