Inverter circuit, fluorescent tube lighting apparatus, backlight apparatus, and liquid crystal display
First Claim
1. A drive apparatus used for driving a plurality of fluorescent tubes disposed so that the longitudinal directions thereof are substantially parallel to one another,wherein the drive apparatus comprises first and second inverter transformers each having the same number of windings, andwherein, when the plurality of fluorescent tubes are driven, a voltage from the first inverter transformer is supplied to one-end side of the plurality of fluorescent tubes, and a voltage from the second inverter transformer is supplied to the other-end side of the plurality of fluorescent tubes, so as to apply voltages having opposite phases to the ends of each of the fluorescent tubes.
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Accused Products
Abstract
A driving apparatus and a driving method are disclosed that are capable of uniformly lighting each entire fluorescent tube irrespective of the length or number of fluorescent tubes when simultaneously driving a plurality of fluorescent tubes in a fluorescent tube lighting apparatus. When two inverter circuits having respective transformers are provided at both ends of a fluorescent tube to light the fluorescent tube by push-pull driving, feedback windings of transformers not used in self-excited oscillation of each inverter circuit are connected together, with the transformer connection that connects together the feedback windings being either in-phase or in opposite phase, and the method of connection for fluorescent tubes connecting to secondary windings of each transformer can be changed in accordance with that connection method.
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Citations
29 Claims
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1. A drive apparatus used for driving a plurality of fluorescent tubes disposed so that the longitudinal directions thereof are substantially parallel to one another,
wherein the drive apparatus comprises first and second inverter transformers each having the same number of windings, and wherein, when the plurality of fluorescent tubes are driven, a voltage from the first inverter transformer is supplied to one-end side of the plurality of fluorescent tubes, and a voltage from the second inverter transformer is supplied to the other-end side of the plurality of fluorescent tubes, so as to apply voltages having opposite phases to the ends of each of the fluorescent tubes.
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3. A drive apparatus used for driving a plurality of fluorescent tubes disposed so that the longitudinal directions thereof are substantially parallel to one another,
wherein the drive apparatus comprises first and second inverter transformers each having one primary winding and a plurality of secondary windings, and wherein, when the plurality of fluorescent tubes are driven, a voltage from the first inverter transformer is supplied to one-end side of the plurality of fluorescent tubes, and a voltage from the second inverter transformer is supplied to the other-end side of the plurality of fluorescent tubes, so as to apply voltages having opposite phases to the ends of each of the fluorescent tubes.
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13. An inverter circuit used in a pair for driving a plurality of fluorescent tubes disposed so that the longitudinal directions thereof are substantially parallel to one another,
wherein, when a pair of the inverter circuits are used for driving the plurality of fluorescent tubes, a voltage from one of the inverter circuits is supplied to one-end side of the plurality of fluorescent tubes, and a voltage from the other is supplied to the other-end side of the plurality of fluorescent tubes, so as to apply voltages having opposite phases to the ends of each of the fluorescent tubes, and wherein the same number of inverter transformers each having the same number of windings are provided in each of the pair.
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14. An inverter circuit used in a pair for driving a plurality of fluorescent tubes disposed so that the longitudinal directions thereof are substantially parallel to one another,
wherein, when a pair of the inverter circuits are used for driving the plurality of fluorescent tubes, a voltage from one of the inverter circuits is supplied to one-end side of the plurality of fluorescent tubes, and a voltage from the other is supplied to the other-end side of the plurality of fluorescent tubes, so as to apply voltages having opposite phases to the ends of each of the fluorescent tubes, and wherein each of the pair is provided with an inverter transformer having one primary winding and a plurality of secondary windings.
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23. A drive apparatus used for driving a plurality of fluorescent tubes disposed so that the longitudinal directions thereof are substantially parallel to one another,
wherein the drive apparatus comprises a first inverter transformer group comprising a plurality of inverter transformers for supplying voltages to one-end side of the plurality of fluorescent tubes and a second inverter transformer group comprising a plurality of inverter transformers for supplying voltages to the other-end side of the plurality of fluorescent tubes, and wherein voltages having opposite phases are supplied to the ends of each of the fluorescent tubes by the first inverter transformer group and the second inverter transformer group.
Specification