US3763377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Random cycle load switch
Assignee: Individual
•
Filing: 1972-04-10
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Granted: 1973-10-02
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Expires: 1992-04-10
Abstract
Abstract Current to a primary load is sensed and utilized in order to simultaneously complete a circuit which includes a secondary load and a triac. A current transformer has a primary winding in series with the primary load and a secondary winding coupled to the cathode and gate electrodes of the triac, so that a current to the primary load will cause a gate current sufficient to switch the triac from a non-conducting state to a conducting state.
Inventors
- 👤 A Weston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:48
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/722; H03K17/723
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
118 words
Apparatus for supplying current to a secondary load simultaneously with current flow from a voltage source to a primary load, comprising a secondary load connected to the voltage source and a triac, a current transformer having a winding connected to the voltage source and the primary load and having a winding with one end connected to the cathode of said triac and its other end connected through a resistor to the gate of said triac, whereby current flow from the voltage source to the primary load will initiate a flow of current to said gate electrode and cuase said triac to become conducting, thereby completing the circuit which includes the voltage source, the triac, and the secondary load.
Claim 2
Dependent Claim
118 words
Apparatus for supplying current to a secondary load simultaneously with current flow from a voltage source to a primary load, comprising a secondary load connected to the voltage source and a triac, a current transformer having a winding connected to the voltage source and the primary load and having a winding with one end connected to the cathode of said triac and its other end connected through a resistor to the gate of said triac, whereby current flow from the voltage source to the primary load will initiate a flow of current to said gate electrode and cuase said triac to become conducting, thereby completing the circuit which includes the voltage source, the triac, and the secondary load.
Claim 3
Dependent Claim
117 words
Apparatus for operating a source of illumination in conjunction with the operation of an electrical appliance which is connected to a voltage source, comprising a source of illumination electrically connected in a circuit with a voltage source and a triac having anode, cathode, and gate electrodes, a current transformer having a primary winding connected to the voltage source and the appliance, said transformer having a secondary winding having one end connected to said cathode and its other end connected through a resistor to said gate electrode, whereby current to the appliance causes a gate current sufficient to cause the triac to switch to a conducTing state to complete the electrical circuit which includes said source of illumination.
Claim 4
Dependent Claim
117 words
Apparatus for operating a source of illumination in conjunction with the operation of an electrical appliance which is connected to a voltage source, comprising a source of illumination electrically connected in a circuit with a voltage source and a triac having anode, cathode, and gate electrodes, a current transformer having a primary winding connected to the voltage source and the appliance, said transformer having a secondary winding having one end connected to said cathode and its other end connected through a resistor to said gate electrode, whereby current to the appliance causes a gate current sufficient to cause the triac to switch to a conducTing state to complete the electrical circuit which includes said source of illumination.
Claim 5
Dependent Claim
122 words
Apparatus for turning a lamp on and off simultaneously with the random on and off operation of a refrigerator motor which is connected to a voltage source, comprising a lamp located externally of the refrigerator, a triac having anode, cathode and gate electrodes, said lamp being connected to said voltage source and to said anode, a current transformer having a primary winding connected to the voltage source and the refrigerator motor, said transformer having a secondary winding having one end connected to said cathode and its other end connected through a resistor to said gate electrode, whereby said triac is in a non-conducting state when the refrigerator motor is off and is in a conducting state when the refrigerator motor is on.
Claim 6
Dependent Claim
122 words
Apparatus for turning a lamp on and off simultaneously with the random on and off operation of a refrigerator motor which is connected to a voltage source, comprising a lamp located externally of the refrigerator, a triac having anode, cathode and gate electrodes, said lamp being connected to said voltage source and to said anode, a current transformer having a primary winding connected to the voltage source and the refrigerator motor, said transformer having a secondary winding having one end connected to said cathode and its other end connected through a resistor to said gate electrode, whereby said triac is in a non-conducting state when the refrigerator motor is off and is in a conducting state when the refrigerator motor is on.
References Cited (Backward Citations)
US3527957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |