Patent US4123690A successfully refreshed from Google Patents.
US4123690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Discharge lamp ballast circuit
Assignee: General Electric Co
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Filing: 1977-03-07
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Granted: 1978-10-31
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Expires: 1997-03-07
Abstract
Abstract Electrical ballast circuit of improved power factor for operating gaseous discharge lamps. Two discharge lamps are respectively connected to two inductively coupled induction coils for obtaining high power factor without the use of capacitors.
Inventors
- 👤 Mitchell M. Osteen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:17
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/20; H05B41/23; H05B41/231; Y; Y10; Y10S; Y10S315/00; Y10S315/05
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
Lamp operating apparatus comprising, in combination, an alternating current source, a first circuit comprising a first inductor and a first gaseous discharge lamp connected in series across said alternating current source, and a second circuit comprising a second inductor inductively coupled to said first inductor and a second gaseous discharge lamp connected across said second inductor, the current in said second circuit being derived solely from the inductive coupling of said first and second inductors, and means providing for the output current of said second circuit to lead the output current of said first circuit and for thereby improving the power factor of said alternating current source without using a capacitor therefor.
Claim 2
Dependent Claim
112 words
Lamp operating apparatus comprising, in combination, an alternating current source, a first circuit comprising a first inductor and a first gaseous discharge lamp connected in series across said alternating current source, and a second circuit comprising a second inductor inductively coupled to said first inductor and a second gaseous discharge lamp connected across said second inductor, the current in said second circuit being derived solely from the inductive coupling of said first and second inductors, and means providing for the output current of said second circuit to lead the output current of said first circuit and for thereby improving the power factor of said alternating current source without using a capacitor therefor.
Claim 3
Dependent Claim
17 words
Apparatus as defined in claim 1, said first lamp having a higher voltage than said second lamp.
Claim 4
Dependent Claim
27 words
Apparatus as defined in claim 1, said inductors comprising wound coils, the turns ratio of said first inductor relative to said second inductor being greater than 1.
Claim 5
Dependent Claim
143 words
Lamp operating apparatus comprising, in combination an alternating current source, a first circuit comprising a first inductor and a first gaseous discharge lamp connected in series across said alternating current source, and a second circuit comprising a second inductor inductively coupled to said first inductor and a second gaseous discharge lamp connected across said second inductor, the current in said second circuit being derived solely from the inductive coupling of said first and second inductors, the output current of said second circuit leading the output current of said first circuit, whereby the power factor of said alternating current source is improved, said apparatus including a magnetic core forming a closed magnetic circuit and having spaced leg portions, said first and second inductors respectively comprising first and second coils wound on at least one of said leg portions and substantially spaced from each other.
Claim 6
Dependent Claim
143 words
Lamp operating apparatus comprising, in combination an alternating current source, a first circuit comprising a first inductor and a first gaseous discharge lamp connected in series across said alternating current source, and a second circuit comprising a second inductor inductively coupled to said first inductor and a second gaseous discharge lamp connected across said second inductor, the current in said second circuit being derived solely from the inductive coupling of said first and second inductors, the output current of said second circuit leading the output current of said first circuit, whereby the power factor of said alternating current source is improved, said apparatus including a magnetic core forming a closed magnetic circuit and having spaced leg portions, said first and second inductors respectively comprising first and second coils wound on at least one of said leg portions and substantially spaced from each other.
Claim 7
Dependent Claim
33 words
Apparatus as defined in claim 4, said core having magnetic shunt means extending between said spaced leg portions, said first and second coils being arranged on opposite sides of said magnetic shunt means.
Claim 8
Dependent Claim
17 words
Apparatus as defined in claim 1, said second lamp having a higher wattage than said first lamp.
Claim 9
Dependent Claim
109 words
Electrical load operating apparatus comprising, in combination, an alternating current source, a first circuit comprising a first inductor and a first load connected in series across said alternating current source, and a second circuit comprising a second inductor inductively coupled to said first inductor and a second load connected across said second inductor, the current in said second circuit being derived solely from the inductive coupling of said first and second inductors, and means providing for the output current of said second circuit to lead the output current of said first circuit and for thereby improving the power factor of said alternating current source without using a capacitor therefor.
Claim 10
Dependent Claim
109 words
Electrical load operating apparatus comprising, in combination, an alternating current source, a first circuit comprising a first inductor and a first load connected in series across said alternating current source, and a second circuit comprising a second inductor inductively coupled to said first inductor and a second load connected across said second inductor, the current in said second circuit being derived solely from the inductive coupling of said first and second inductors, and means providing for the output current of said second circuit to lead the output current of said first circuit and for thereby improving the power factor of said alternating current source without using a capacitor therefor.
Claim 11
Dependent Claim
18 words
Apparatus as defined in claim 7, wherein at least one of said loads is a gaseous discharge lamp.
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) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |