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US 5,399,944 AGranted
Ballast circuit for driving gas discharge
AssigneeMotorola Lighting, Inc.
InventorsJohn G. Konopka, Peter W. Shackle
Life of this patent
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Abstract
A circuit for powering gas discharge lamps includes a power factor correction inductor coupled to a source of rectified, pulsating AC power. An energy storage circuit is connected to the power factor correction inductor, and a switch is coupled to a junction between the power factor correction inductor and the energy storage circuit. A resonant circuit couples the energy storage circuit to the gas discharge lamps.
Claims18
A ballast circuit for driving a gas discharge lamp comprising:
- a source of pulsating, rectified AC;
- a power factor correction inductor coupled to the source;
- an energy storage circuit comprising an energy storage inductor with its first terminal connected to the switch and its second to a storage capacitor, the energy storage circuit connected to the power factor correction inductor;
- a switch, coupled to a junction between the power factor correction inductor and the energy storage circuit;
- a resonant circuit coupled to the energy storage circuit for energizing the gas discharge lamp;
- and
- the energy storage inductor having a primary winding and an output winding, the primary winding having first end second primary winding terminals, the first terminal being a connected to the switch and the second terminal connected to a storage capacitor connected to circuit common;
- the output winding connected to the resonant circuit.
5 more elements
A ballast circuit for driving a gas discharge lamp comprising:
- a source of pulsating, rectified AC;
- a power factor correction inductor coupled to the source;
- a diode coupled in series with the power factor correction inductor and oriented to stop power from returning to the source from the energy storage circuit;
- an energy storage inductor connected to the power factor correction inductor at a junction, the energy storage inductor having at least one clamping winding;
- a switch coupled between a circuit common and the junction between the power factor correction inductor and the energy storage inductor;
- a storage capacitor coupled between the energy storage inductor and the circuit common;
- a resonant circuit inductively coupled to the energy storage circuit for energizing the gas discharge lamp;
- and
- the energy storage inductor having a primary winding and an output winding, and the resonant circuit coupled to the energy storage inductor by way of the output winding.
6 more elements
Dependencies are inferred from the claim text.