Variable frequency bridge inverter for driving gas discharge lam

Details Variable frequency bridge inverter for driving gas discharge lam Variable frequency bridge inverter for driving gas discharge lam

1985-09-23

1987-08-04

Dixon, Harold

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315222, 315226, 315DIG7, H05B 3702

Patent

active

046848509

ABSTRACT:
A solid state bridge inverter is disclosed wherein the power for driving the transistors is generated by the current flowing to the load. Windings are so connected on the drive transformers that one transistor cannot possibly turn on until the other one is fully off including storage and turn off time. This is accomplished in such a manner that the load may be highly inductive without any detrimental effect upon the power transistors. Also disclosed is a unique method for deriving the power for the logic circuitry as well as a concept where a single magnetic element can provide both a balun type filter action on the input as well as power factor correction and smoothing action to supply filtered DC voltage and current to the inverter while maintaining a 0.9+ power factor to the AC line. Further disclosed is a combination of the above described components along with further unique circuit configurations to provide a highly efficient solid state fluorescent ballast.

REFERENCES:
patent: 3753071 (1973-08-01), Engel et al.
patent: 4045711 (1977-08-01), Pitel
patent: 4370600 (1983-01-01), Zansky
patent: 4471269 (1984-09-01), Ganser et al.

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