Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1991-05-28
1992-09-01
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315219, 315200R, 315244, 315241R, H05B 3700, H05B 3900, H05B 4114
Patent
active
051442043
ABSTRACT:
An improved tapped-inductor boost converter for operating a gas discharge lamp is disclosed. The converter includes a pair of input terminals connected to a power source supplying an input voltage, a pair of output terminals for providing an output voltage greater than or equal to the input voltage to the lamp, or other load, a tapped-inductor having first and second windings, an active switch for controlling current flow through the first winding for variably controlling the output voltage, a passive switch for controlling current flow through the second winding, and a first capacitor. The converter further includes an arrangement for varying the clamping voltage at the active switch in response to variations in the output voltage and also includes a clamping capacitor for transferring energy stored in the leakage inductance of the tapped-inductor to the load for improved efficiency. In the preferred embodiment, the first and clamping capacitors are interconnected to form a first filter, and the converter includes a second filter connected to one of the output terminals. The respective time constants of the first and second filters are predetermined for obtaining relatively high lamp ripple current during the run mode of the lamp, and relatively low lamp ripple current during the start mode of the lamp.
REFERENCES:
patent: 4201949 (1980-05-01), Robbins
Basch John G.
Nerone Louis R.
Corwin Stanley C.
General Electric Company
Hawranko George E.
Jacob Fred
LaRoche Eugene R.
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