Inverter ballast circuit with shoot through prevention, auto tra

Details Inverter ballast circuit with shoot through prevention, auto tra Inverter ballast circuit with shoot through prevention, auto tra

1981-10-19

1984-01-03

Dixon, Harold

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315209R, 315219, 315223, 315244, H05B 3702

Patent

active

044244681

ABSTRACT:
An inverter ballast for fluorescent lamps utilizing a resonant circuit coupled to the lamp and operated from a source of DC power through transistors. The transistors are controlled by a sensing means in the resonant loop which insures that the transistor switch at zero current. Furthermore, the coupling means for the load controls a source of heater voltage to the anodes of the fluorescent light which operate at very low current, an antisaturation circuit made up of separate windings are on the current transformer and connected to the switching transistor bases and through diodes to the power supply to prevent "shoot through" current in the transistors. An autotransformer is used as a high leakage reactance transformer; and a circuit is provided to prevent overload of the resonant circuit in case of lamp failure. Shoot through currents are prevented, and overload of the resonant circuit is prevented, and an autotransformer coupling of the resonant circuit to the load is used.

REFERENCES:
patent: 3753071 (1973-08-01), Engel et al.
patent: 4042852 (1977-08-01), Zaderej et al.
patent: 4045711 (1977-08-01), Pitel
patent: 4109307 (1978-08-01), Knoll
patent: 4127798 (1978-11-01), Anderson
patent: 4251752 (1981-02-01), Stolz
patent: 4277728 (1981-07-01), Stevens
patent: 4346332 (1982-08-01), Walden
patent: 4370600 (1983-01-01), Zansky

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