Disclosed is 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 separating a lamp
power and a circuit driving power. 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.
