Patent EP0190918A1 successfully refreshed from Google Patents.
US5495405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverter circuit for use with discharge tube
Assignee: Individual
•
Filing: 1994-08-29
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Granted: 1996-02-27
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Expires: 2014-08-29
Abstract
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.
Inventors
- 👤 Tadamasa Fujimura
- 👤 Masakazu Ushijima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:03
CPC Classifications
H; H03; H03H; H03H2/00; H05; H05B; H05B41/00; H05B41/14; H05B41/26; H05B41/28; H05B41/282; H05B41/2821; H05B41/2822
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
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.
Claim 2
Dependent Claim
106 words
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.
Claim 3
Dependent Claim
18 words
The inverter circuit according to claim 1, further including a capacitor connected in parallel with said discharge tube.
Claim 4
Dependent Claim
15 words
The inverter circuit according to claim 1, wherein said inductive ballast is a choke coil.
Claim 5
Dependent Claim
170 words
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.
Claim 6
Dependent Claim
170 words
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.
Claim 7
Dependent Claim
18 words
The inverter circuit according to claim 4, further including a capacitor connected in parallel with said discharge tube.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-26 | 1999-08-28 | 2000-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-26 | 2003-08-28 | 2004-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-26 | 2007-08-28 | 2008-02-27 | $7700.00 | Window Closed / Lapsed |