US3715623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Network for varying current through a load
Assignee: Southwest Laboratories Inc
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Filing: 1971-10-18
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Granted: 1973-02-06
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Expires: 1991-10-18
Abstract
Abstract A sensing device controls an input pulse generator that is connected to the input terminal of one of at least two cascaded bistable devices. The output signals of the bistable devices are decoded and the resultant signal is used in a control circuit for controlling the amount of current flowing in a load dependent upon the decoder signal.
Inventors
- 👤 J Szabo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:18
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/1555; H05; H05B; H05B47/00; H05B47/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
160 words
In combination, a source of trigger pulses, at least first and second cascade connected bistable devices each having an input terminal and an output terminal and two stable and different states, means connecting said source of trigger pulses to said input terminal of said first bistable device for applying trigger pulses to said first bistable device to change the state thereof, a decoder having an input terminal means and an output terminal, said decoder having a characteristic that varies in response to variations in input signals applied to said input terminal means thereof, means connecting said output terminals of said bistable devices to said input terminal means of said decoder for applying output signals of said bistable devices to said decoder, a load, means connecting said load in circuit with a source of electrical energy whereby current may flow through said load, and means responsive to variations in said characteristic for varying the amount of current flowing through said load.
Claim 2
Dependent Claim
160 words
In combination, a source of trigger pulses, at least first and second cascade connected bistable devices each having an input terminal and an output terminal and two stable and different states, means connecting said source of trigger pulses to said input terminal of said first bistable device for applying trigger pulses to said first bistable device to change the state thereof, a decoder having an input terminal means and an output terminal, said decoder having a characteristic that varies in response to variations in input signals applied to said input terminal means thereof, means connecting said output terminals of said bistable devices to said input terminal means of said decoder for applying output signals of said bistable devices to said decoder, a load, means connecting said load in circuit with a source of electrical energy whereby current may flow through said load, and means responsive to variations in said characteristic for varying the amount of current flowing through said load.
Claim 3
Dependent Claim
160 words
In combination, a source of trigger pulses, at least first and second cascade connected bistable devices each having an input terminal and an output terminal and two stable and different states, means connecting said source of trigger pulses to said input terminal of said first bistable device for applying trigger pulses to said first bistable device to change the state thereof, a decoder having an input terminal means and an output terminal, said decoder having a characteristic that varies in response to variations in input signals applied to said input terminal means thereof, means connecting said output terminals of said bistable devices to said input terminal means of said decoder for applying output signals of said bistable devices to said decoder, a load, means connecting said load in circuit with a source of electrical energy whereby current may flow through said load, and means responsive to variations in said characteristic for varying the amount of current flowing through said load.
Claim 4
Dependent Claim
160 words
In combination, a source of trigger pulses, at least first and second cascade connected bistable devices each having an input terminal and an output terminal and two stable and different states, means connecting said source of trigger pulses to said input terminal of said first bistable device for applying trigger pulses to said first bistable device to change the state thereof, a decoder having an input terminal means and an output terminal, said decoder having a characteristic that varies in response to variations in input signals applied to said input terminal means thereof, means connecting said output terminals of said bistable devices to said input terminal means of said decoder for applying output signals of said bistable devices to said decoder, a load, means connecting said load in circuit with a source of electrical energy whereby current may flow through said load, and means responsive to variations in said characteristic for varying the amount of current flowing through said load.
Claim 5
Dependent Claim
17 words
The invention according to claim 1 wherein said characteristic is the time constant of a resistance-capacitance network.
Claim 6
Dependent Claim
92 words
The invention according to claim 2 wherein said decoder includes at least two resistance-capacitance networks each having a different time constant and at least two transistors, one of said transistors being connected in circuit with one of said resistance-capacitance networks and the other of said transistors being in circuit with the other of said resistance-capacitance networks, said output signals of said bistable devices being applied to respective ones of said transistors to turn said transistors on and off and close and open respectively said circuits including said resistance-capacitance networks and said transistors.
Claim 7
Dependent Claim
63 words
The invention according to claim 2 wherein said decoder includes a resistance-capacitance network and at least two transistors, said transistors being connected in separate circuits in parallel with said resistance-capacitance network, said output signals of said bistable devices being applied to respective ones of said transistors to turn said transistors on and off and close and open respectively said circuits including said transistors.
Claim 8
Dependent Claim
51 words
The invention according to claim 1 wherein said decoder includes a pulse transformer having primary and secondary windings and a transistor, said transistor being connected as a load in circuit with said secondary winding, said output signals of said bistable devices being applied to said transistor to vary the conductivity thereof.
Claim 9
Dependent Claim
39 words
The invention according to claim 1 wherein said means responsive to variations in said characteristic for varying the amount of current flowing through said load is a gate controlled switch, said switch being connected in circuit with said load.
Claim 10
Dependent Claim
14 words
The invention according to claim 6 wherein said switch is a silicon controlled rectifier.
Claim 11
Dependent Claim
12 words
The invention according to claim 6 wherein said switch is a triac.
Claim 12
Dependent Claim
13 words
The invention according to claim 1 wherein said load is a light bulb.
References Cited (Backward Citations)
US3666988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |