Electronic ballast of the high power factor-constant power type

Details Electronic ballast of the high power factor-constant power type Electronic ballast of the high power factor-constant power type

1993-08-16

1994-12-06

Pascal, Robert J.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315309, 315307, 315308, 315291, 315DIG5, H05B 4116

Patent

active

053714431

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 for initial discharging between electrodes of the discharge lamp. According to the invention, the instantaneous starting and lighting of the discharge lamp can readily been performed regardless of a variation in the input voltage and the consumption power can be reduced by the high power factor and efficiency.

REFERENCES:
patent: 4277726 (1981-07-01), Burke
patent: 4316125 (1982-02-01), Noguchi
patent: 4963797 (1990-10-01), Kulku et al.

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