Abstract: An electronic ballast of the high power factor-constant power type comprising a power factor correction and constant voltage circuit for inputting a supply voltage through a temperature switch, a noise removing filter and a full-wave rectifying circuit, the power factor correction and constant voltage circuit storing electric energy during a conductive period of a load and, using a counter electromotive force resulting from the electric energy during a non-conductive period of the load, enhancing a power factor at an input stage and generating a constant voltage regardless of a variation in the supply voltage, a constant current inverter circuit connected to the power factor correction and constant voltage circuit to convert the constant voltage into a sinusoidal wave voltage, so as to supply a constant current for maintaining a normal lighting state of a discharge lamp, and a high voltage generating circuit connected to the power factor correction and constant voltage circuit to supply a high voltage pulse f