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US 5,309,065 AGranted
Voltage doubler ballast system employing resonant combination tuned to between the second and third harmonic of the AC source
AssigneeHubbell Incorporated
InventorsJoe A. Nuckolls, Yan Wang
Life of this patent
Estimating the term…
Abstract
A ballast circuit system provides for efficient starting and operation of high voltage discharge lamps using a common 120 volt AC power source. As a result of this improved ballast circuit system, the necessary high voltage is generated from a normal 120 volt AC in such a way that there is low power loss. The system efficiency allows for use of plastic fixtures and small size packaging of the discharge lamp.
Claims12
A low loss ballast circuit system for operating a high voltage discharge lamp, comprising:
- alternating current voltage source input means:
- inductance means connected to said input means for receiving said alternating current voltage;
- rectifying means including capacitance means connected to said inductance means wherein the output of said rectifying means is an open circuit DC voltage substantially equal to twice the peak value of said alternating current source voltage and wherein the value of said inductance means and said capacitance means is chosen so that a resonant frequency of a combination of said inductance means and said capacitance means is at a value between and spaced from each of second and third harmonics of said alternating current source voltage;
- and
- ignitor means connected to receive said open circuit voltage and provide a high voltage ignition pulse to start said lamp and including a means for forcing said started lamp to a low impedance state thereby allow continued operation of said lamp by said open circuit DC voltage.
2 more elements
A ballast circuit for operating a high voltage discharge lamp, comprising:
- input means for receiving an alternating current voltage source;
- and
- rectifying means including an inductance means connected to said input means and a capacitance means connected to said inductance means,
- wherein the output of said rectifying means is an open circuit DC voltage substantially equal to twice the peak value of said alternating current source voltage and wherein the value of said inductance means and said capacitance means is chosen so that the resonant frequency of a combination of said inductance means and said capacitance means is at a value between and spaced from each of second and third harmonics of said alternating current source voltage.
1 more element
Dependencies are inferred from the claim text.