High frequency energy saving ballast

Details High frequency energy saving ballast High frequency energy saving ballast

1988-03-02

1989-08-22

Griffin, Robert L.

Electric lamp and discharge devices: systems

Discharge device load

Discharge control discharge device load

315206, 315DIG7, H05B 4100

Patent

active

048599140

ABSTRACT:
A circuit is disclosed for energizing electrical devices such as fluorescent lamps and other gas discharge luminescent devices. The circuit provides energizing signals for gaseous discharge tubes at a voltage sufficient to initiate ionization of the gases therein. The signals are characterized by frequencies in the range of from about 60 hertz to 30 megahertz. After ignition the circuit automatically reduces the voltages and currents of the devices to a level sufficient to maintain gas ionization, and save energy. The circuit also reduces shock hazard. A preferred wave shaping in the energizing circuit is disclosed which creates purer square and sine waves for reducing radio frequency interference and electromagnetic interference, and a "soft-on" circuit is disclosed which greatly reduces the voltages applied to the devices thereby increasing the life of the devices. An automatic and a manual dimming section are also disclosed which dim the light output for the devices. The dimming sections, which are independent of each other, save additional energy.

REFERENCES:
patent: 4394603 (1983-07-01), Widmayer
patent: 4435670 (1984-03-01), Evans et al.

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