US3793538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for periodically energizing an electrical load
Assignee: Motors Liquidation Co
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Filing: 1972-11-30
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Granted: 1974-02-19
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Expires: 1992-11-30
Abstract
Abstract A silicon controlled rectifier is connected in series with an electrical load to be periodically energized across a direct current potential source. The emitter-collector electrodes of a type PNP transistor are connected in shunt across the anodecathode electrodes of the silicon controlled rectifier and the base electrode is connected to ground through the collectoremitter electrodes of a type NPN transistor. The output signals of a square wave output type oscillator circuit trigger the silicon controlled rectifier conductive to complete an energizing circuit for the electrical load and another oscillator circuit, responsive to the potential appearing across the electrical load, produces an output signal which triggers the type NPN transistor conductive through the collector-emitter electrodes to ground the base electrode of the type PNP transistor to trigger this device conductive through the emitter-collector electrodes, a condition which drains holding current from the silicon controlled rectifier.
Inventors
- 👤 W Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:00
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/73
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
223 words
A circuit for periodically energizing an electrical load comprising in combination with a source of direct current potential having positive and negative polarity output terminals and an electrical load to be periodically energized, a silicon controlled rectifier having anode-cathode and gate electrodes, means for connecting said anode-cathode electrodes of said silicon controlled rectifier and said electrical load in series across said output terminals of said source of direct current potential, a type PNP transistor having emitter, collector and base electrodes, means for connecting said emitter-collector electrodes of said type PNP transistor across said anode-cathode electrodes of said silicon controlled rectifier, means for producing a series of electrical trigger signals, means for applying said trigger signals across said gate-cathode electrodes of said silicon controlled rectifier whereby said silicon controlled rectifier is triggered conductive by each of said trigger signals, a normally open electrical switching device of the type having current carrying elements operable to an electrical circuit closed condition in response to an electrical signal, means for connecting said base electrode of said type PNP transistor to said negative polarity output terminal of said source of direct current potential through said current carrying elements of said electrical switching device, means for producing an electrical signal after each one of said trigger signals, and means for applying said electrical signals to said electrical switching device.
Claim 2
Dependent Claim
223 words
A circuit for periodically energizing an electrical load comprising in combination with a source of direct current potential having positive and negative polarity output terminals and an electrical load to be periodically energized, a silicon controlled rectifier having anode-cathode and gate electrodes, means for connecting said anode-cathode electrodes of said silicon controlled rectifier and said electrical load in series across said output terminals of said source of direct current potential, a type PNP transistor having emitter, collector and base electrodes, means for connecting said emitter-collector electrodes of said type PNP transistor across said anode-cathode electrodes of said silicon controlled rectifier, means for producing a series of electrical trigger signals, means for applying said trigger signals across said gate-cathode electrodes of said silicon controlled rectifier whereby said silicon controlled rectifier is triggered conductive by each of said trigger signals, a normally open electrical switching device of the type having current carrying elements operable to an electrical circuit closed condition in response to an electrical signal, means for connecting said base electrode of said type PNP transistor to said negative polarity output terminal of said source of direct current potential through said current carrying elements of said electrical switching device, means for producing an electrical signal after each one of said trigger signals, and means for applying said electrical signals to said electrical switching device.
Claim 3
Dependent Claim
211 words
A circuit for periodically energizing an electrical load comprising in combination with a source of direct current potential having positive and negative polarity output terminals and an electrical load to be periodically energized, a silicon controlled rectifier having anode, cathode and gate electrodes, means for connecting said anode-cathode electrodes of said silicon controlled rectifier and said electrical load in series across said output terminals of said source of direct current potential, a type PNP transistor having emitter, collector and base electrodes, means for connecting said emitter-collector electrodes of said type PNP transistor across said anode-cathode electrodes of said silicon controlled rectifier, means for producing a series of electrical trigger signals, means for applying said trigger signals across said gate-cathode electrodes of said silicon controlled rectifier whereby said silicon controlled rectifier is triggered conductive by each of said trigger signals, a type NPN transistor having collector, emitter and base electrodes, means for connecting said base electrode of said type PNP transistor to said negative polarity output terminal of said source of direct current potential through said collector-emitter electrodes of said type NPN transistor, means for producing an electrical signal after each one of said trigger signals, and means for applying said electrical signals across said base-emitter electrodes of said type NPN transistor.
Claim 4
Dependent Claim
211 words
A circuit for periodically energizing an electrical load comprising in combination with a source of direct current potential having positive and negative polarity output terminals and an electrical load to be periodically energized, a silicon controlled rectifier having anode, cathode and gate electrodes, means for connecting said anode-cathode electrodes of said silicon controlled rectifier and said electrical load in series across said output terminals of said source of direct current potential, a type PNP transistor having emitter, collector and base electrodes, means for connecting said emitter-collector electrodes of said type PNP transistor across said anode-cathode electrodes of said silicon controlled rectifier, means for producing a series of electrical trigger signals, means for applying said trigger signals across said gate-cathode electrodes of said silicon controlled rectifier whereby said silicon controlled rectifier is triggered conductive by each of said trigger signals, a type NPN transistor having collector, emitter and base electrodes, means for connecting said base electrode of said type PNP transistor to said negative polarity output terminal of said source of direct current potential through said collector-emitter electrodes of said type NPN transistor, means for producing an electrical signal after each one of said trigger signals, and means for applying said electrical signals across said base-emitter electrodes of said type NPN transistor.
Claim 5
Dependent Claim
226 words
A circuit for periodically energizing an electrical load comprising in combination with a source of direct current Potential having positive and negative polarity output terminals and an electrical load to be periodically energized, a silicon controlled rectifier having anode, cathode and gate electrodes, means for connecting said anode-cathode electrodes of said silicon controlled rectifier and said electrical load in series across said output terminals of said source of direct current potential, a type PNP transistor having emitter, collector and base electrodes, means for connecting said emitter-collector electrodes of said type PNP transistor across said anode-cathode electrodes of said silicon controlled rectifier, a first oscillator circuit for producing a series of electrical trigger signals, means for applying said trigger signals across said gate-cathode electrodes of said silicon controlled rectifier whereby said silicon controlled rectifier is triggered conductive by each of said trigger signals, a type NPN transistor having collector, emitter and base electrodes, means for connecting said base electrode of said type PNP transistor to said negative polarity output terminal of said source of direct current potential through said collector-emitter electrodes of said type NPN transistor, means for producing an electrical signal in response to the flow of current through said electrical load upon the conduction of said silicon controlled rectifier, and means for applying said electrical signal across said base-emitter electrodes of said type NPN transistor.
Claim 6
Dependent Claim
226 words
A circuit for periodically energizing an electrical load comprising in combination with a source of direct current Potential having positive and negative polarity output terminals and an electrical load to be periodically energized, a silicon controlled rectifier having anode, cathode and gate electrodes, means for connecting said anode-cathode electrodes of said silicon controlled rectifier and said electrical load in series across said output terminals of said source of direct current potential, a type PNP transistor having emitter, collector and base electrodes, means for connecting said emitter-collector electrodes of said type PNP transistor across said anode-cathode electrodes of said silicon controlled rectifier, a first oscillator circuit for producing a series of electrical trigger signals, means for applying said trigger signals across said gate-cathode electrodes of said silicon controlled rectifier whereby said silicon controlled rectifier is triggered conductive by each of said trigger signals, a type NPN transistor having collector, emitter and base electrodes, means for connecting said base electrode of said type PNP transistor to said negative polarity output terminal of said source of direct current potential through said collector-emitter electrodes of said type NPN transistor, means for producing an electrical signal in response to the flow of current through said electrical load upon the conduction of said silicon controlled rectifier, and means for applying said electrical signal across said base-emitter electrodes of said type NPN transistor.
Claim 7
Dependent Claim
257 words
A circuit for periodically energizing an electrical load comprising in combination with a source of direct current potential having positive and negative polarity output terminals and an electrical load to be periodically energized, a silicon controlled rectifier having anode, cathode and gate electrodes, means for connecting said anode-cathode electrodes of said silicon controlled rectifier and said electrical load in series across said output terminals of said source of direct current potential, a type PNP transistor having emitter, collector and base electrodes, means for connecting said emitter-collector electrodes of said type PNP transistor across said anode-cathode electrodes of said silicon controlled rectifier, a first oscillator circuit for producing a series of electrical trigger signals, means for applying said trigger signals across said gate-cathode electrodes of said silicon controlled rectifier, whereby said silicon controlled rectifier is triggered conductive by each of said trigger signals, a type NPN transistor having collector, emitter and base electrodes, means for connecting said base electrode of said type PNP transistor to said negative polarity output terminal of said source of direct current potential through said collector-emitter electrodes of said type NPN transistor, a second oscillator circuit of the type which produces an output signal in response to an electrical signal applied to the input circuit thereof, means for applying the electrical signal appearing across said electrical load upon the conduction of said silicon controlled rectifier to the said input circuit of said second oscillator, and means for applying said output signal of said second oscillator across said base-emitter electrodes of said type NPN transistor.
Claim 8
Dependent Claim
257 words
A circuit for periodically energizing an electrical load comprising in combination with a source of direct current potential having positive and negative polarity output terminals and an electrical load to be periodically energized, a silicon controlled rectifier having anode, cathode and gate electrodes, means for connecting said anode-cathode electrodes of said silicon controlled rectifier and said electrical load in series across said output terminals of said source of direct current potential, a type PNP transistor having emitter, collector and base electrodes, means for connecting said emitter-collector electrodes of said type PNP transistor across said anode-cathode electrodes of said silicon controlled rectifier, a first oscillator circuit for producing a series of electrical trigger signals, means for applying said trigger signals across said gate-cathode electrodes of said silicon controlled rectifier, whereby said silicon controlled rectifier is triggered conductive by each of said trigger signals, a type NPN transistor having collector, emitter and base electrodes, means for connecting said base electrode of said type PNP transistor to said negative polarity output terminal of said source of direct current potential through said collector-emitter electrodes of said type NPN transistor, a second oscillator circuit of the type which produces an output signal in response to an electrical signal applied to the input circuit thereof, means for applying the electrical signal appearing across said electrical load upon the conduction of said silicon controlled rectifier to the said input circuit of said second oscillator, and means for applying said output signal of said second oscillator across said base-emitter electrodes of said type NPN transistor.
Claim 9
Dependent Claim
258 words
A circuit for periodically energizing an electrical load comprising in combination with a source of direct current potential having positive and negative polarity output terminals and an electrical load to be periodically energized, a silicon controlled rectifier having anode, cathode and gate electrodes, means for connecting said anode-cathode electrodes of said silicon controlled rectifier and said electrical load in series across said output terminals of said source of direct current potential, a type PNP transistor having emitter, collector and base electrodes, means for connecting said emitter-collector electrodes of said type PNP transistor across said anode-cathode electrodes of said silicon controlled rectifier, a variable frequency oscIllator circuit for producing a series of electrical trigger signals, means for applying said trigger signals across said gate-cathode electrodes of said silicon controlled rectifier whereby said silicon controlled rectifier is triggered conductive by each of said trigger signals, a type NPN transistor having collector, emitter and base electrodes, means for connecting said base electrode of said type PNP transistor to said negative polarity output terminal of said source of direct current potential through said collector-emitter electrodes of said type NPN transistor, a second oscillator circuit of the type which produces an output signal in response to an electrical signal applied to the input circuit thereof, means for applying the electrical signal appearing across said electrical load upon the conduction of said silicon controlled rectifier to the said input circuit of said second oscillator, and means for applying said output signal of said second oscillator across said base-emitter electrodes of said type NPN transistor.
Claim 10
Dependent Claim
258 words
A circuit for periodically energizing an electrical load comprising in combination with a source of direct current potential having positive and negative polarity output terminals and an electrical load to be periodically energized, a silicon controlled rectifier having anode, cathode and gate electrodes, means for connecting said anode-cathode electrodes of said silicon controlled rectifier and said electrical load in series across said output terminals of said source of direct current potential, a type PNP transistor having emitter, collector and base electrodes, means for connecting said emitter-collector electrodes of said type PNP transistor across said anode-cathode electrodes of said silicon controlled rectifier, a variable frequency oscIllator circuit for producing a series of electrical trigger signals, means for applying said trigger signals across said gate-cathode electrodes of said silicon controlled rectifier whereby said silicon controlled rectifier is triggered conductive by each of said trigger signals, a type NPN transistor having collector, emitter and base electrodes, means for connecting said base electrode of said type PNP transistor to said negative polarity output terminal of said source of direct current potential through said collector-emitter electrodes of said type NPN transistor, a second oscillator circuit of the type which produces an output signal in response to an electrical signal applied to the input circuit thereof, means for applying the electrical signal appearing across said electrical load upon the conduction of said silicon controlled rectifier to the said input circuit of said second oscillator, and means for applying said output signal of said second oscillator across said base-emitter electrodes of said type NPN transistor.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |