Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1999-10-01
2000-07-18
Vu, David
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315224, 315DIG7, 315247, H05B 3702
Patent
active
060912103
ABSTRACT:
An electronic ballast for gas lamp loads, such as ionized lamps, that includes a boost power factor correction used to correct the power factor and minimize the total harmonic distortion. The boost includes an inductor that periodically stores and discharges its resulting voltage in a charging capacitor through an optional bypass diode connected in parallel with an electronic switch using the oscillator that is applied to the load. The addition of the bypass diode decreases the total harmonic distortion. The inductor is selected, in combination with the rest of the circuit, so that it never reaches saturation. The inductor periodically charges the charging capacitor above (twice) the peak voltage that is supplied by a rectified continuous source of direct voltage. The high intensity discharge load is connected to a suitable resonant circuit. The load inductor as well as the elements of the resonant circuit and biasing elements of the oscillator include devices that permit a user to select different values thus affecting the resonant frequency.
REFERENCES:
patent: 5051662 (1991-09-01), Counts
patent: 5568041 (1996-10-01), Hesterman
patent: 5798615 (1998-08-01), Gasparini et al.
Sachelima J.
Vu David
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