US4410838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling power consumption in lighting loads and the like
Assignee: DEERFIELD SYSTEMS Inc 100 WEST TENTH ST WILMINGTON DE A CORP OF
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Filing: 1981-07-02
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Granted: 1983-10-18
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Expires: 2001-07-02
Abstract
Abstract Apparatus for interrupting power to a plurality of parallel loads such as lighting circuits and selectively reapplying power to the loads includes a first switch serially interconnecting the loads to a power line. Second switch circuits are serially connected with each load whereby interruption of power to a load for a predetermined period of time opens the switch circuits. The switch circuits include bidirectional conduction devices such as triacs which require a gating signal before becoming conductive. A resistor-capacitor circuit provides a gating signal to the triac to maintain conduction thereof for the predetermined period of time.
Inventors
- 👤 Kurt A. Hirschfeld
- 👤 Gordon H. Bowman-Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:17
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/257; H02M5/2573
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
242 words
A method of controlling power consumption in a plurality of lighting circuits connected in parallel and maintaining conduction of said load circuits after a momentary loss of electrical power comprising the steps of: providing a first switch means in series with all loads for removing electrical power to all loads on opening of said first switch means, providing a plurality of second switch means, each of said second switch means being serially connected with a load, each of said second switch means including first and second serially connected switches each having a conducting state and a non-conducting state, said first switch having an off position for immediately removing power to a load, an on position, and a reset position and said second switch having a conduction gating terminal and control means for applying an ignition signal to said conduction gating terminal and for maintaining ignition signal for a limited period of time after removal of power and thereafter rendering said second switch non-conductive, said control means reapplying the ignition signal upon movement of said first switch to said reset position and thereby reigniting said second switch removing electrical power to all loads by opening said first switch means for at least said limited period of time, reclosing said first switch means, and selectively reenergizing a lighting circuit by moving a first switch to said reset position thereby applying an ignition signal to the conduction gating terminal of the serially connected second switch.
Claim 2
Independent Claim
242 words
A method of controlling power consumption in a plurality of lighting circuits connected in parallel and maintaining conduction of said load circuits after a momentary loss of electrical power comprising the steps of: providing a first switch means in series with all loads for removing electrical power to all loads on opening of said first switch means, providing a plurality of second switch means, each of said second switch means being serially connected with a load, each of said second switch means including first and second serially connected switches each having a conducting state and a non-conducting state, said first switch having an off position for immediately removing power to a load, an on position, and a reset position and said second switch having a conduction gating terminal and control means for applying an ignition signal to said conduction gating terminal and for maintaining ignition signal for a limited period of time after removal of power and thereafter rendering said second switch non-conductive, said control means reapplying the ignition signal upon movement of said first switch to said reset position and thereby reigniting said second switch removing electrical power to all loads by opening said first switch means for at least said limited period of time, reclosing said first switch means, and selectively reenergizing a lighting circuit by moving a first switch to said reset position thereby applying an ignition signal to the conduction gating terminal of the serially connected second switch.
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) | 1986-10-17 | 1987-04-18 | 1987-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-17 | 1991-04-18 | 1991-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-17 | 1995-04-18 | 1995-10-18 | $7700.00 | Window Closed / Lapsed |