Patent US3629647A successfully refreshed from Google Patents.
US3629647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage doubler starting circuit for discharge lamp
Assignee: General Electric Co
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Filing: 1970-07-15
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Granted: 1971-12-21
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Expires: 1990-07-15
Abstract
Abstract A voltage doubler starting circuit converting the AC voltage impressed on the lamp to a DC voltage of twice the peak AC amplitude which is fed back to the lamp terminals. The circuit includes two diodes and two capacitors arranged in a voltage doubling configuration along with a bleeder resistor, and may, if desired, be built into the lamp base or into the lamp itself in the case of a double envelope lamp. The circuit is used with a ballast of the magnetic type having a series secondary power factor correcting capacitor.
Inventors
- 👤 William H Lake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:45
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/54
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
160 words
A discharge lamp for operation on a ballast of the kind which includes a series power factor correcting capacitOr comprising: an arc tube having terminals for connection across said ballast; a voltage-doubling feedback circuit comprising a first stage including in series a first capacitor and a first diode connected shunt across said arc tube; and a second stage including in series a second diode and a second capacitor connected in shunt across said first diode; said second diode having forward conduction in the shunt circuit in a direction opposite to the first diode, said second capacitor being connected to one side of said arc tube, a bleeder resistor connecting the junction of said second diode and second capacitor to the other side of said arc tube; said first capacitor having a capacitance which is smaller than that of the series power factor correcting capacitor; and said second capacitor having a capacitance which is smaller than that of the first capacitor.
Claim 2
Dependent Claim
160 words
A discharge lamp for operation on a ballast of the kind which includes a series power factor correcting capacitOr comprising: an arc tube having terminals for connection across said ballast; a voltage-doubling feedback circuit comprising a first stage including in series a first capacitor and a first diode connected shunt across said arc tube; and a second stage including in series a second diode and a second capacitor connected in shunt across said first diode; said second diode having forward conduction in the shunt circuit in a direction opposite to the first diode, said second capacitor being connected to one side of said arc tube, a bleeder resistor connecting the junction of said second diode and second capacitor to the other side of said arc tube; said first capacitor having a capacitance which is smaller than that of the series power factor correcting capacitor; and said second capacitor having a capacitance which is smaller than that of the first capacitor.
Claim 3
Dependent Claim
42 words
A lamp as in claim 1 wherein the capacitance of said first capacitor is not more than one-tenth that of the series power factor correcting capacitor, and that of said second capacitor is not more than one-tenth that of the first capacitor.
Claim 4
Dependent Claim
32 words
A lamp as in claim 1 of the double envelope type including an outer jacket surrounding said arc tube and wherein said voltage-doubling feedback circuit is an integral part of the lamp.
Claim 5
Dependent Claim
45 words
A lamp as in claim 1 of the double envelope type including an outer jacket surrounding said arc tube, a screw base mounted on the neck of said outer jacket and wherein elements of said voltage doubling feedback circuit are located within said screw base.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |