US5666279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage resonance inverter circuit for dimable cold cathode tubes
Assignee: Minebea Co Ltd
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Filing: 1995-11-22
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Granted: 1997-09-09
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Expires: 2015-11-22
Abstract
Abstract An object of the present invention is to provide a voltage resonance inverter circuit capable of performing constantly a zero-voltage switching action in response to a change in the input voltage. For achievement of the above object of the present invention, the capacitance of a voltage resonance capacitor is decreased in response to an increase of the input voltage thus increasing the characteristic impedance of a resonance circuit. This will increase the amplitude of a resonance voltage causing a zero-voltage switching action.
Inventors
- 👤 Takao Takehara
- 👤 Shingo Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:35
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H05; H05B; H05B41/00; H05B41/14; H05B41/26; H05B41/28; H05B41/282; H05B41/2821; H05B41/2824; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
111 words
A voltage resonance inverter circuit having a serial resonance circuit provided at a primary side of a booster transformer, a controller circuit for turning on and off the serial resonance circuit by conducting a switching element at the timing of phase advanced from the resonance frequency of the serial resonance circuit, and a load provided at a secondary side of the booster transformer, comprising: a comparator for detecting an input voltage of the voltage resonance inverter circuit; a switch circuit for switching the frequency of the resonance circuit; and a controlling means for shifting a resonance frequency of the resonance circuit to a higher rate when the input voltage is higher.
Claim 2
Dependent Claim
111 words
A voltage resonance inverter circuit having a serial resonance circuit provided at a primary side of a booster transformer, a controller circuit for turning on and off the serial resonance circuit by conducting a switching element at the timing of phase advanced from the resonance frequency of the serial resonance circuit, and a load provided at a secondary side of the booster transformer, comprising: a comparator for detecting an input voltage of the voltage resonance inverter circuit; a switch circuit for switching the frequency of the resonance circuit; and a controlling means for shifting a resonance frequency of the resonance circuit to a higher rate when the input voltage is higher.
Claim 3
Dependent Claim
26 words
A voltage resonance inverter circuit according to claim 1, wherein the load provided at the secondary side of the booster transformer is a cold cathode tube.
Claim 4
Dependent Claim
32 words
A voltage resonance inverter circuit according to claim 1, wherein the switch circuit for switching the resonance frequency of the resonance circuit is a circuit for changing a capacitance of a capacitor.
Claim 5
Dependent Claim
29 words
A voltage resonance inverter circuit according to claim 1, wherein the switch circuit for switching the resonance frequency of the resonance circuit is a circuit for changing an inductance.
References Cited (Backward Citations)
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Cited
US5278748A
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US5490052A
Cited
US5448465A
Cited
US5450307A
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US5530638A
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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) | 2000-09-08 | 2001-03-10 | 2001-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-08 | 2005-03-10 | 2005-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-08 | 2009-03-10 | 2009-09-09 | $7700.00 | Window Closed / Lapsed |