Patent US4017785A successfully refreshed from Google Patents.
US4017785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power source for fluorescent lamps and the like
Assignee: CLARK ENGINEERING INC
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Filing: 1975-09-10
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Granted: 1977-04-12
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Expires: 1995-09-10
Abstract
Abstract A power source for operating gas discharge lamps and other loads at high frequency, typically utilizing a 115 volt ac source rectified to provide a dc input in the order of 150 volts, and providing a 20,000 hertz output. An inverter with power supply, oscillator circuit and transformer, with conventional primary, secondary and feedback windings for operating the transistor oscillator. An additional output winding on the transformer with a rectifier and filter providing a supplemental dc supply connected to the main dc supply in parallel or in series to supplement a fluctuating main dc supply and maintain continuous oscillator operation while utilizing small filter capacitance and substantially reducing peak ac line current.
Inventors
- 👤 Lloyd J. Perper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:57
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/453; H02M5/458; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3385; H05; H05B; H05B41/00; H05B41/14; H05B41/26; H05B41/28; H05B41/282; H05B41/2821; Y; Y10; Y10S; Y10S315/00; Y10S315/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
169 words
In a high frequency power source for a load such as gas discharge lamps, and having an inverter with power supply, oscillator circuit and transformer, said power supply having a first rectifier and filter circuit with ac input terminals and dc output terminals and providing a first dc voltage at said dc terminals, said transformer having primary, secondary and feedback windings, said oscillator circuit including a transistor having emitter and collector electrodes connected in series with said primary winding across said dc terminals and having the base and one of said electrodes connected across said feedback winding, the improvement comprising: an output winding on said transformer; a second rectifier and filter circuit connected across said output winding for developing a second dc voltage from the oscillator output; and first means for connecting said second dc voltage in circuit with said first dc voltage in aiding relation to supplement the fluctuating first dc voltage thereby reducing the ac line current peaks and the power factor at the ac input terminals.
Claim 2
Dependent Claim
169 words
In a high frequency power source for a load such as gas discharge lamps, and having an inverter with power supply, oscillator circuit and transformer, said power supply having a first rectifier and filter circuit with ac input terminals and dc output terminals and providing a first dc voltage at said dc terminals, said transformer having primary, secondary and feedback windings, said oscillator circuit including a transistor having emitter and collector electrodes connected in series with said primary winding across said dc terminals and having the base and one of said electrodes connected across said feedback winding, the improvement comprising: an output winding on said transformer; a second rectifier and filter circuit connected across said output winding for developing a second dc voltage from the oscillator output; and first means for connecting said second dc voltage in circuit with said first dc voltage in aiding relation to supplement the fluctuating first dc voltage thereby reducing the ac line current peaks and the power factor at the ac input terminals.
Claim 3
Dependent Claim
26 words
A power source as defined in claim 1 wherein said second dc voltage is connected in series with said first dc voltage by said first means.
Claim 4
Dependent Claim
26 words
A power source as defined in claim 1 wherein said second dc voltage is connected in parallel with said first dc voltage by said first means.
Claim 5
Dependent Claim
32 words
A power source as defined in claim 1 wherein said second circuit includes a rectifier and a capacitor in series across said output winding, with said second voltage appearing across said capacitor.
Claim 6
Dependent Claim
30 words
A power source as defined in claim 4 wherein said first means includes an additional rectifier in series between like polarity terminals of said power supply and said second circuit.
Claim 7
Dependent Claim
40 words
A power source as defined in claim 1 wherein said second dc voltage is connected in parallel with said first dc voltage by said first means including a rectifier for blocking current from said power supply to said second circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |