US3958131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state power control apparatus
Assignee: STALEY ELEVATOR CO Inc
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Filing: 1974-05-29
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Granted: 1976-05-18
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Expires: 1994-05-29
Abstract
Abstract A solid state power controller adapted for use with a single or multiple phase A.C. power source employs, for each phase, oppositely poled directional transistor switches connected in parallel with a load, and parallel oppositely poled directional transistor switches serially connecting the load and a line source phase. Control circuitry is provided for rendering the serial transistor switches selectively operative in a chopping, pulse modulated mode which is variable to effect power control. The load shunting directional switches are alternately enabled responsive to the instantaneous line voltage polarity for transient suppression.
Inventors
- 👤 Alexander Mozdzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:11
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/445
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
In combination in power controlling circuitry, a source of A.C. potential, a load, oppositely poled, shunt connected first and second directional controlled switches connected in parallel with said load, oppositely poled shunt connected third and fourth directional controlled switches serially connecting said load with said source of A.C. potential, and control circuit means, said control circuit means comprising pulsing means for alternately enabling each of said third and fourth directional controlled switches in a chopping mode of operation to control the power supplied to said load, said pulsing means comprising means for supplying a repetitive series of switchenabling pulses to each of said third and fourth directional controlled switches during each associated half-cycle of said A.C. potential.
Claim 2
Dependent Claim
117 words
In combination in power controlling circuitry, a source of A.C. potential, a load, oppositely poled, shunt connected first and second directional controlled switches connected in parallel with said load, oppositely poled shunt connected third and fourth directional controlled switches serially connecting said load with said source of A.C. potential, and control circuit means, said control circuit means comprising pulsing means for alternately enabling each of said third and fourth directional controlled switches in a chopping mode of operation to control the power supplied to said load, said pulsing means comprising means for supplying a repetitive series of switchenabling pulses to each of said third and fourth directional controlled switches during each associated half-cycle of said A.C. potential.
Claim 3
Dependent Claim
38 words
A combination as in claim 2, wherein said control circuit means further comprises means for alternately enabling said first and second directional controlled switches responsive to the instantaneous polarity of the potential supplied by said A.C. potential source.
Claim 4
Dependent Claim
28 words
A combination as in claim 2, wherein said first and second switch controlling means includes means coupled to said source of A.C. potential for determining the polarity thereof.
Claim 5
Dependent Claim
97 words
A combination as in claim 2, wherein said control circuit means comprises means coupled to said source of A.C. potential for determining the polarity thereof, detection means coupled to said source of A.C. potential for providing an output identification upon each zero crossing thereof, relaxation oscillator means synchronized by the output of said zero crossing detecting means, threshold trigger means connected to said relaxation oscillator means, and logic means responsive to the outputs of said threshold trigger means and said line polarity determining means for providing output control signals for said first through fourth directional controlled switches.
Claim 6
Dependent Claim
37 words
A combination as in claim 4 wherein said logic means comprises plural coincidence logic gate means each supplied with the output of said threshold trigger circuit means and with an output from said line polarity determining means.
Claim 7
Dependent Claim
31 words
A combination as in claim 5, further comprising lead network means connected to said source of A.C. potential for providing a phase leading version thereof to said zero crossing detecting means.
Claim 8
Dependent Claim
86 words
A combination as in claim 1, further comprising plural additional sources of A.C. potential each supplying an A.C. potential of the same frequency as that supplied by said source of A.C. potential but differing in phase from the potential supplied by said source and differing in phase from each other, plural zero crossing detector means connected to each of said additional A.C. potential sources, and disjunctive logic means having plural inputs each connected to the output of a different one of said zero crossing detector means.
Claim 9
Dependent Claim
74 words
A combination as in claim 1, further comprising control circuit including means responsive to a first polarity obtaining from said A.C. potential source for closing said first and third controlled switches, opening said second controlled switch, and operating said fourth switch in a chopping mode; and means responsive to the alternate A.C. potential polarity for closing said second and fourth switches, opening said first switch, and operating said third switch in a chopping mode.
Claim 10
Dependent Claim
41 words
A combination as in claim 8, wherein each of said first through fourth controlled switches comprises a transistor, and driver means isolated on a D.C. basis from any power main coupled to said transistor base-emitter junction and to said control circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |