Electrical circuit with dual stage resonant circuit for igniting a gas discharge lamp
First Claim
1. A circuit for igniting and operating a gas discharge lamp, the circuit comprising:
- an inverter comprising a plurality of power switches set to operate at a first switching frequency during a lamp ignition mode to supply a variable voltage output signal; and
a resonant circuit connected to receive the variable voltage output signal from the inverter, wherein said resonant circuit comprises a first circuit stage and a second circuit stage, and further wherein the second circuit stage includes a resonant tank circuit configured to generate a resonant output voltage when the switching frequency of the inverter matches a resonant frequency of the resonant circuit, and wherein the first circuit stage comprises at least one current-suppressing element for reducing a fluxing effect of a resonant current that flows in the resonant circuit on a switching current that flows in the inverter, said flux-reducing effect occurring when the switching frequency of the inverter matches the resonant frequency of the resonant circuit, wherein the resonant current essentially flows just through the second circuit stage.
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Accused Products
Abstract
A circuit such as may be used for igniting and operating a gas discharge lamp is provided. The circuit includes a resonant circuit connected to receive a variable voltage output signal from an inverter. The resonant circuit includes a first circuit stage and a second circuit stage. The second circuit stage includes a resonant tank circuit configured to generate a resonant output voltage when a switching frequency of the inverter matches a resonant frequency of the resonant circuit. The first circuit stage includes at least one current-suppressing element for reducing an effect of a resonant current that flows in the resonant circuit on a switching current that flows in the inverter.
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Citations
20 Claims
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1. A circuit for igniting and operating a gas discharge lamp, the circuit comprising:
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an inverter comprising a plurality of power switches set to operate at a first switching frequency during a lamp ignition mode to supply a variable voltage output signal; and a resonant circuit connected to receive the variable voltage output signal from the inverter, wherein said resonant circuit comprises a first circuit stage and a second circuit stage, and further wherein the second circuit stage includes a resonant tank circuit configured to generate a resonant output voltage when the switching frequency of the inverter matches a resonant frequency of the resonant circuit, and wherein the first circuit stage comprises at least one current-suppressing element for reducing a fluxing effect of a resonant current that flows in the resonant circuit on a switching current that flows in the inverter, said flux-reducing effect occurring when the switching frequency of the inverter matches the resonant frequency of the resonant circuit, wherein the resonant current essentially flows just through the second circuit stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A circuit for electrically driving a load in at least two distinct modes of operation, the circuit comprising:
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an inverter comprising a plurality of power switches set to operate at a first switching frequency during a first mode of operation to supply a variable voltage output signal; and a resonant circuit connected to receive the variable voltage output signal from the inverter, wherein said resonant circuit comprises a first circuit stage and a second circuit stage, and further wherein the second circuit stage includes a resonant tank circuit configured to generate a resonant output voltage when the set first switching frequency of the inverter matches a resonant frequency of the resonant circuit, and wherein the first circuit stage comprises at least one current-suppressing inductor for reducing a fluxing effect of a resonant current in the resonant circuit on a switching current in the inverter, said flux-reducing effect occurring when the first switching frequency of the inverter matches the resonant frequency of the resonant circuit, wherein the resonant current essentially flows just through the second circuit stage. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A circuit for igniting and operating a gas discharge lamp, the circuit comprising:
a resonant circuit connected to receive a variable voltage output signal from an inverter, wherein said resonant circuit comprises a first circuit stage and a second circuit stage, and further wherein the second circuit stage includes a resonant tank circuit configured to generate a resonant output voltage when a switching frequency of the inverter matches a resonant frequency of the resonant circuit, and wherein the first circuit stage comprises at least one current-suppressing element for reducing a fluxing effect of a resonant current that flows in the resonant circuit on a switching current that flows in the inverter, said flux-reducing effect occurring when the switching frequency of the inverter matches the resonant frequency of the resonant circuit, wherein the resonant current essentially flows just through the second circuit stage.
Specification