ELECTRODELESS PLASMA LAMP SYSTEMS AND METHODS
First Claim
1. An electrodeless plasma lamp comprising:
- a lamp body comprising a dielectric material having a relative permittivity greater than 2;
a bulb proximate the lamp body, the bulb containing a fill that forms a plasma when radio frequency (RF) power is coupled to the fill from the lamp body, the fill including a gas and at least one metal halide; and
a lamp drive circuit for providing RF power to the lamp body;
wherein the RF power is provided to the fill to vaporize the metal halide and emit light; and
wherein the lamp drive circuit is configured to adjust the RF power provided to the fill after light is emitted by the vaporized metal halide to maintain a substantially constant brightness as the load conditions of the plasma change during heat up of the plasma.
1 Assignment
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Accused Products
Abstract
Systems and methods for an electrodeless plasma lamp as described. A drive probe is coupled to the lamp body to provide the primary power for ignition and steady state operation of the lamp. Feedback is used to adjust frequency in response to changing conditions of the lamp during startup. A phase shifter is used to adjust the phase of the power between ignition and steady state operation. A sensor may detect a lamp operating condition that automatically triggers a shift in phase after the fill in the bulb is vaporized. The phase shift may then continue to be adjusted as the plasma heats up and the impedance continues to change. The bias conditions of an amplifier may be changed to change the operating class of the amplifier for different modes of the lamp.
81 Citations
130 Claims
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1. An electrodeless plasma lamp comprising:
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a lamp body comprising a dielectric material having a relative permittivity greater than 2; a bulb proximate the lamp body, the bulb containing a fill that forms a plasma when radio frequency (RF) power is coupled to the fill from the lamp body, the fill including a gas and at least one metal halide; and a lamp drive circuit for providing RF power to the lamp body; wherein the RF power is provided to the fill to vaporize the metal halide and emit light; and wherein the lamp drive circuit is configured to adjust the RF power provided to the fill after light is emitted by the vaporized metal halide to maintain a substantially constant brightness as the load conditions of the plasma change during heat up of the plasma. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 43, 44, 45, 46, 47, 48)
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26. An electrodeless plasma lamp comprising:
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a resonant structure comprising a solid dielectric material and an electrically conductive material; a bulb proximate the resonant structure, the bulb containing a fill that forms a plasma when radio frequency (RF) power is coupled to the fill from the resonant structure, the fill including a gas and at least one metal halide; and a lamp drive circuit for providing RF power to the resonant structure at a frequency within a resonant bandwidth for the resonant structure such that the RF power is coupled to the fill to vaporize the metal halide and emit light; wherein the lamp drive circuit is configured to adjust the RF power provided to the fill after light is emitted by the vaporized metal halide to maintain a brightness within a range of a constant value as the load conditions of the plasma change during heat up of the plasma. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method comprising:
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providing a lamp body comprising a dielectric material having a relative permittivity greater than 2; positioning a bulb proximate the lamp body, the bulb containing a fill, the fill including a gas and at least one metal halide; coupling power to the fill through the lamp body to vaporize the metal halide and emit light; and adjusting the RF power after light is emitted by the vaporized metal halide to maintain a brightness within a range of a constant value as the load conditions of the plasma change during heat up of the plasma. - View Dependent Claims (39, 40, 41, 42)
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49. An electrodeless plasma lamp comprising:
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a resonant structure comprising a solid dielectric material and an electrically conductive material; a bulb proximate the resonant structure, the bulb containing a fill that forms a plasma when radio frequency (RF) power is coupled to the fill from the resonant structure, the fill including a gas and at least one metal halide; and a lamp drive circuit for providing RF power to the resonant structure at a frequency within a resonant bandwidth for the resonant structure such that the RF power is coupled to the fill to vaporize the metal halide and emit light; the lamp drive circuit including an amplifier and an impedance control circuit configured to adjust an impedance between the amplifier and the resonant structure. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61)
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62. An electrodeless plasma lamp comprising:
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a bulb containing a fill that forms a plasma; a power amplifier for providing radio frequency power to the plasma at a frequency in the range of about 50 MHz to 10 GHz, the power amplifier capable of operating in at least two classes of operation; and control electronics configured to change the class of operation of the power amplifier. - View Dependent Claims (63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74)
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75. An electrodeless plasma lamp comprising:
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a bulb containing a fill that forms a plasma; a power amplifier for providing radio frequency power to the plasma at a frequency in the range of about 50 MHz to 10 GHz; and control electronics configured to change the gate bias voltage of the power amplifier. - View Dependent Claims (76, 77, 78, 79, 80, 81, 82, 83, 84)
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85. A method comprising:
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providing a bulb containing a fill that forms a plasma; coupling power from an amplifier to the plasma at a frequency in the range of about 50 MHz to 10 GHz; and adjusting the gate bias voltage of the power amplifier. - View Dependent Claims (86)
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87. An electrodeless plasma lamp comprising:
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a lamp body comprising a dielectric material having a relative permittivity greater than 2; a bulb adjacent to the lamp body, the bulb containing a fill that forms a plasma when RF power is coupled to the fill from the lamp body; an RF feed coupled to the lamp body; and a radio frequency (RF) power source for coupling power into the lamp body through the RF feed, the RF power source configured to provide RF power at a frequency that forms a standing wave within the lamp body; wherein the shortest distance between an end of the bulb and an end of the RF feed traverses at least one electrically conductive material of the lamp body. - View Dependent Claims (88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100)
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101. An electrodeless plasma lamp comprising:
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a resonant structure comprising a solid dielectric material and an electrically conductive material; a bulb proximate the resonant structure, the bulb containing a fill that forms a plasma when RF power is coupled to the fill from the resonant structure; and a probe configured to couple the RF power into the resonant structure at a frequency within the resonant bandwidth for the resonant structure, wherein an end of the probe is spaced apart from the electrically conductive material by the solid dielectric material; wherein the distance between the end of the probe and the electrically conductive material is in the range of about 1 mm to 10 mm. - View Dependent Claims (102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130)
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Specification