US4030013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency lighting system AC line voltage sensing
Assignee: General Electric Co
•
Filing: 1975-08-25
•
Granted: 1977-06-14
•
Expires: 1995-08-25
Abstract
Abstract An emergency lighting system includes a high reactance transformer with a primary winding for connection to AC line voltage and a secondary winding. Circuit means are provided for monitoring the AC line voltage and includes means for coupling the transformer secondary winding to a non-linear load, a battery, during one AC half cycle and means for coupling the secondary winding to a linear load during an alternate AC half cycle to provide a DC voltage proportional to the AC line voltage.
Inventors
- 👤 Donald L. Watrous
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:57
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/062; H02J9/065; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/539
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
In an emergency lighting system having a high reactance transformer with a primary winding adapted for coupling to an AC energy source and a secondary winding, circuit means for monitoring the AC source voltage comprising: means for coupling the secondary winding of the transformer with a non-linear load during one half cycle of the AC source voltage; and means for coupling the transformer secondary winding with a linear load during an alternate half cycle of the AC source voltage to provide DC voltage proportional to the AC source voltage.
Claim 2
Dependent Claim
89 words
In an emergency lighting system having a high reactance transformer with a primary winding adapted for coupling to an AC energy source and a secondary winding, circuit means for monitoring the AC source voltage comprising: means for coupling the secondary winding of the transformer with a non-linear load during one half cycle of the AC source voltage; and means for coupling the transformer secondary winding with a linear load during an alternate half cycle of the AC source voltage to provide DC voltage proportional to the AC source voltage.
Claim 3
Dependent Claim
13 words
The circuit means of claim 1 wherein the transformer secondary winding is center-tapped.
Claim 4
Dependent Claim
39 words
The circuit means of claim 2 wherein the means for coupling with a non-linear load includes a diode connected serially with a battery between a first leg of the secondary winding and the center tap for charging the battery.
Claim 5
Dependent Claim
56 words
The circuit means of claim 2 wherein the means for coupling with a linear load includes a diode connected serially with a capacitance between a second leg of the secondary winding and the center-tap, and a resistance connected in shunt with the capacitance, the DC voltage proportional to the AC source voltage appearing across the resistance.
References Cited (Backward Citations)
FR724224A
Cited
US2650339A
Cited
US3659179A
Cited
US3836815A
Cited
US3790810A
Cited
US3875421A
Cited
US3868562A
Cited
US3900783A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |