US3736443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trigger circuit
Assignee: Individual
•
Filing: 1968-05-16
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Granted: 1973-05-29
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Expires: 1988-05-16
Abstract
Abstract A trigger circuit is disclosed which is particularly useful in controlling the conduction of a switching or relay circuit utilizing silicon controlled rectifiers. The relay circuit includes two silicon controlled rectifiers connected in inverted parallel relation with a common gate resistor network. The trigger circuit is connected to the gate resistor network and includes a silicon unilateral switch and a control network. When the silicon unilateral switch is conducting, the relay circuit is turned off, and when the silicon unilateral switch is nonconducting, the relay circuit is turned on. The control network of the trigger circuit can be connected to provide several functions such as sensitivity control, momentary-on and momentary-off control, locking of the on and off conditions and touch control.
Inventors
- 👤 L Striggow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:30
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/083; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/725
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
206 words
In combination with a switching circuit for controlling current flow between a pair of lines carrying alternating current, the switching circuit including a pair of silicon controlled rectifiers connected in inverted parallel relation with each other between said lines, a load connected in series with said silicon controlled rectifiers, and a resistor network connected between said lines and the gates of said silicon controlled rectifiers, a trigger circuit for controlling the conduction of said silicon controlled rectifiers including a silicon unilateral switch having an anode, a gate and a cathode, means connecting said anode to said resistor network, means including a diode connecting said cathode to one side of said load, means including another diode connecting said cathode to the line opposite from the load side of said switching circuit, a first switching device connected between the anode and gate of said silicon unilateral switch for blocking conduction thereof by shorting said anode to said gate when said switching device is closed, and a second switching device connected between said gate and said cathode of said silicon unilateral switch for causing conduction thereof when said second switching device is closed, thereby controlling conduction of said sIlicon unilateral switch to control conduction of said silicon controlled rectifiers.
Claim 2
Dependent Claim
206 words
In combination with a switching circuit for controlling current flow between a pair of lines carrying alternating current, the switching circuit including a pair of silicon controlled rectifiers connected in inverted parallel relation with each other between said lines, a load connected in series with said silicon controlled rectifiers, and a resistor network connected between said lines and the gates of said silicon controlled rectifiers, a trigger circuit for controlling the conduction of said silicon controlled rectifiers including a silicon unilateral switch having an anode, a gate and a cathode, means connecting said anode to said resistor network, means including a diode connecting said cathode to one side of said load, means including another diode connecting said cathode to the line opposite from the load side of said switching circuit, a first switching device connected between the anode and gate of said silicon unilateral switch for blocking conduction thereof by shorting said anode to said gate when said switching device is closed, and a second switching device connected between said gate and said cathode of said silicon unilateral switch for causing conduction thereof when said second switching device is closed, thereby controlling conduction of said sIlicon unilateral switch to control conduction of said silicon controlled rectifiers.
Claim 3
Dependent Claim
118 words
The combination as claimed in claim 1 in which said switching devices each comprise a transistor having an emitter, a base and a collector, and including means connecting the emitter-collector path of one of said transistors between the anode and gate of said silicon unilateral switch, means connecting the emitter-collector path of the other transistor between the gate and cathode of said silicon unilateral switch, the bases of said transistors each having a terminal, and a supply terminal connected to said opposite line, whereby simultaneous touching or capacitive coupling or conductive coupling of said supply terminal and either of said base terminals renders the respective transistor conductive to thereby selectively control the conduction of said silicon unilateral 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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |