US3781595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical discharge lamp
Assignee: The General Electric Company PLC
•
Filing: 1971-05-28
•
Granted: 1973-12-25
•
Expires: 1991-05-28
Abstract
Abstract An operating circuit for an electrical discharge lamp comprises a ballast inductance, a semiconductor switching device and a capacitance connected in series between a pair of input terminals, a pair of output terminals across which said capacitance is connected, and a control network for triggering the switching device into conduction for a predetermined part of each of at least one set of alternate half cycles of an alternating current supply connected across the input terminals, to provide a voltage across the output terminals for both starting and running a discharge lamp.
Inventors
- 👤 P Samuels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:42
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/20; H05B41/23; H05B41/232
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
167 words
A circuit for operating an electrical discharge lamp from an alternating current supply comprising: a pair of input terminals for connection to an alternating current supply; a pair of output terminals for connection to a discharge lamp; a ballast inductance connected between one of the input terminals and one of the output terminals; a connection between the other input terminal and the other output terminal; a capacitor connected between said other input terminal and the side of said ballast inductance nearer said one output terminal; a semi-conductor switching device connected in series with the ballast inductance and the capacitor between said input terminals; a second inductance connected between said one output terminal and the ballast inductance; and a control network for rendering the switching device conducting for a predetermined part of each of at least one set of alternate half cycles of an alternating current supply connected across the input terminals, to provide a voltage across the output terminals for both starting and running a discharge lamp.
Claim 2
Dependent Claim
167 words
A circuit for operating an electrical discharge lamp from an alternating current supply comprising: a pair of input terminals for connection to an alternating current supply; a pair of output terminals for connection to a discharge lamp; a ballast inductance connected between one of the input terminals and one of the output terminals; a connection between the other input terminal and the other output terminal; a capacitor connected between said other input terminal and the side of said ballast inductance nearer said one output terminal; a semi-conductor switching device connected in series with the ballast inductance and the capacitor between said input terminals; a second inductance connected between said one output terminal and the ballast inductance; and a control network for rendering the switching device conducting for a predetermined part of each of at least one set of alternate half cycles of an alternating current supply connected across the input terminals, to provide a voltage across the output terminals for both starting and running a discharge lamp.
Claim 3
Dependent Claim
36 words
A circuit according to claim 1 wherein the switching device and said second inductance are connected in series with the ballast inductance between said one of the input terminals and said one of the output terminals.
Claim 4
Dependent Claim
34 words
A circuit according to claim 1 wherein the switching device and said capacitance are connected in series between said other input terminal and the side of said ballast inductance nearer said one output terminal.
Claim 5
Dependent Claim
35 words
A circuit according to claim 1 wherein said switching device is a bilateral device and is rendered conducting by the control network for a predetermined part of each half cycle of the alternating current supply.
Claim 6
Dependent Claim
16 words
A circuit according to claim 4 wherein the switching device is a bilateral semiconductor controlled rectifier.
Claim 7
Dependent Claim
29 words
A circuit according to claim 1 wherein the ballast inductance and the capacitance form a resonant network having a resonant frequency higher than the frequency of alternating current supply.
Claim 8
Dependent Claim
50 words
A circuit according to claim 1 wherein a third inductance inductively coupled with said second inductance is connected between an intermediate point of said ballast inductance/switching device/capacitance series combination and said other input terminal, thereby to produce a high voltage strike for starting a lamp connected between the output terminals.
Claim 9
Dependent Claim
36 words
A circuit according to claim 7 wherein said third inductance is connected in series with a second capacitance to form a resonant network having a resonant frequency higher than the frequency of the alternating current supply.
Claim 10
Dependent Claim
20 words
A circUit according to claim 1 wherein said control network comprises a resistive voltage divider connected across the input terminals.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |