Inverter circuit for use with discharge tube
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First Claim
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1. An inverter circuit for a discharge tube comprising:
- a step-up transformer having a core, a primary winding and a secondary winding;
an inductive ballast connected to one end of said secondary winding;
a discharge tube connected across said secondary winding through said inductive ballast in series therewith; and
a resonance circuit composed of a parasitic or stray capacitance produced in said secondary winding, said inductive ballast, and a parasitic or stray capacitance produced in the circumference of said discharge tube,said resonance circuit producing a high voltage by the resonance thereof that is supplied to said discharge tube in order to turn said discharge tube on.
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Abstract
An inverter circuit for use with a discharge tube or lamp such as a cold-cathode fluorescent lamp, a hot-cathode fluorescent lamp, a mercury arc lamp, a metal halide lamp, a neon lamp or the like is provided. The secondary side circuit of a step-up transformer used in the inverter circuit is constructed as a high frequency power supply circuit and a parasitic or stray capacitance produced in the secondary side circuit of the step-up transformer is utilized as a portion or component of a resonance circuit consisting of an inductive ballast or the inductive output of a leakage flux type step-up transformer and the parasitic capacitance.
120 Citations
5 Claims
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1. An inverter circuit for a discharge tube comprising:
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a step-up transformer having a core, a primary winding and a secondary winding; an inductive ballast connected to one end of said secondary winding; a discharge tube connected across said secondary winding through said inductive ballast in series therewith; and a resonance circuit composed of a parasitic or stray capacitance produced in said secondary winding, said inductive ballast, and a parasitic or stray capacitance produced in the circumference of said discharge tube, said resonance circuit producing a high voltage by the resonance thereof that is supplied to said discharge tube in order to turn said discharge tube on. - View Dependent Claims (2, 3)
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4. An inverter circuit for a discharge tube comprising:
- a leakage flux type step-up transformer having an elongated core disposed in substantially a center of said step-up transformer, a primary winding and a secondary winding, said primary winding and secondary winding being wound about said elongated core in juxtaposed relation with each other along said core so that said secondary winding has a portion near to said primary winding which magnetically close couples with said primary winding and a portion remote from said primary winding which magnetically loose couples with said primary winding;
a discharge tube connected across said secondary winding; and a resonance circuit composed of a parasitic or stray capacitance produced mainly in the close coupling portion of said secondary winding, the loose coupling portion of said secondary winding, and a parasitic or stray capacitance produced in the circumference of said discharge tube, said resonance circuit producing a high voltage by the resonance thereof that is supplied to said discharge tube in order to turn said discharge tube on. - View Dependent Claims (5)
- a leakage flux type step-up transformer having an elongated core disposed in substantially a center of said step-up transformer, a primary winding and a secondary winding, said primary winding and secondary winding being wound about said elongated core in juxtaposed relation with each other along said core so that said secondary winding has a portion near to said primary winding which magnetically close couples with said primary winding and a portion remote from said primary winding which magnetically loose couples with said primary winding;
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Litigation Data
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Current AssigneeMasakazu Ushijima
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Original AssigneeMasakazu Ushijima
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InventorsFujimura, Tadamasa, Ushijima, Masakazu
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Primary Examiner(s)Wong, Peter S.
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Assistant Examiner(s)Krishnan, Aditya
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Application NumberUS08/297,736Time in Patent Office547 DaysField of Search315/209 R, 315/219, 315/224, 315/DIG. 4, 315/DIG. 7, 315/411, 331/113 A, 363/131, 363/132, 363/33, 363/133, 363/20-21, 363/56, 363/97, 323/207, 323/228, 323/291US Class Current363/133CPC Class CodesH05B 41/2822 using specially adapted com...
