Electronic ballast for instant-start lamps

Details Electronic ballast for instant-start lamps Electronic ballast for instant-start lamps

1992-03-23

1998-04-28

Neyzari, Ali

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315219, 315DIG5, H05B 4136

Patent

active

057449155

ABSTRACT:
In an electronic ballast, a full-bridge inverter is powered from a DC voltage and provides a square-wave-like inverter output voltage. This inverter output voltage, which has a peak amplitude equal to the magnitude of the DC voltage, is applied to an instant-start fluorescent lamp via a current-limiting inductor connected in series with a DC blocking capacitor. The DC voltage is obtained by way of a pre-converter with a control input operative to permit control of the magnitude of the DC voltage. Prior to the flow of lamp current, the magnitude of the DC voltage is controlled by negative feedback to the control input so as to remain at a certain maximum level. About 100 milli-seconds after initial flow of lamp current, one half of the full-bridge inverter is disabled, thereby reducing the amplitude of the inverter output voltage by half. Additionally, by negative feedback derived from the lamp current itself, the magnitude of the DC voltage is reduced so as to bring the magnitude of the lamp current down to a pre-established desired level.

REFERENCES:
patent: 3026486 (1962-03-01), Pintell
patent: 3733541 (1973-05-01), Elms
patent: 4071812 (1978-01-01), Walker
patent: 4251752 (1981-02-01), Stolz
patent: 4266134 (1981-05-01), Franke et al.
patent: 4504895 (1985-03-01), Steigerwald
patent: 4560908 (1985-12-01), Stupp et al.

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