US3577011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Test circuit
Assignee: TDK Micronas GmbH
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Filing: 1968-06-13
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Granted: 1971-05-04
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Expires: 1988-06-13
Abstract
Abstract There is disclosed a circuit including a gate-controlled switch for gating alternating current to a load. A timing circuit is employed to turn the switch on or off at a predetermined time after the line voltage reaches zero. The device of the invention is especially useful as a test circuit for applying a voltage or interrupting a current to a load at a predetermined time during the cycle of the line voltage. A zero point detector having a manually operable switch is employed to actuate the timing circuit.
Inventors
- 👤 Joseph Gino Raffaelli
- 👤 Hendricus Johnnes Lokkart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:07
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/13; H03K17/136; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/445; H02; H02M; H02M1/00; H02M1/08; H02M1/081
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
310 words
A control circuit for supplying a load with predetermined starting and terminating voltages, said circuit comprising: first means to supply an alternating voltage; second means connected from said first means and actuable by said alternating voltage to produce a gating signal at a predetermined time after said alternating voltage becomes substantially equal to zero; an ON circuit; an OFF circuit; said second means having output means to impress said gating signal on both of said ON and OFF circuits at the same time; selectively actuable switch means connected to said ON and OFF circuits to prevent said gating signal from being impressed on one of said ON and OFF circuits while passing said gating signal to the other of said ON and OFF circuits, said switch means also being actuable to prevent said gating signal from being impressed on said other circuit while passing said gating signal to said one circuit; and a load-switching circuit connected from said first means for connection to the load, said load-switching circuit having an electrical operable switch actuable to connect said first means across the load and actuable to disconnect said first means from the load, said ON and OFF circuits producing ON and OFF output signals, respectively, said load-switching circuit being connected from both of said ON and OFF circuits, said switch being connected to receive and adapted to be actuated by said ON and OFF signals, said ON signal causing said switch to connect said first means to the load, said OFF signal causing said switch to disconnect said first means from the load, said ON circuit being adapted to produce said ON signal when said gating signal is produced and passed by said switch means to said ON circuit, said OFF circuit being adapted to produce said OFF signal when said gating signal is produced and passed by said switch means.
Claim 2
Dependent Claim
310 words
A control circuit for supplying a load with predetermined starting and terminating voltages, said circuit comprising: first means to supply an alternating voltage; second means connected from said first means and actuable by said alternating voltage to produce a gating signal at a predetermined time after said alternating voltage becomes substantially equal to zero; an ON circuit; an OFF circuit; said second means having output means to impress said gating signal on both of said ON and OFF circuits at the same time; selectively actuable switch means connected to said ON and OFF circuits to prevent said gating signal from being impressed on one of said ON and OFF circuits while passing said gating signal to the other of said ON and OFF circuits, said switch means also being actuable to prevent said gating signal from being impressed on said other circuit while passing said gating signal to said one circuit; and a load-switching circuit connected from said first means for connection to the load, said load-switching circuit having an electrical operable switch actuable to connect said first means across the load and actuable to disconnect said first means from the load, said ON and OFF circuits producing ON and OFF output signals, respectively, said load-switching circuit being connected from both of said ON and OFF circuits, said switch being connected to receive and adapted to be actuated by said ON and OFF signals, said ON signal causing said switch to connect said first means to the load, said OFF signal causing said switch to disconnect said first means from the load, said ON circuit being adapted to produce said ON signal when said gating signal is produced and passed by said switch means to said ON circuit, said OFF circuit being adapted to produce said OFF signal when said gating signal is produced and passed by said switch means.
Claim 3
Dependent Claim
114 words
The invention as defined in claim 1, wherein said second means includes a capacitor, a first single-pole, double-throw switch having two contacts and two potentiometers connected from said two contacts, respectively, said switch means including second and third single-pole, double-throw switches for said ON and OFF circuits, respectively, all of said first, second and third switches being ganged together, third means to supply two DC voltages to said ON and OFF circuits, respectively, said DC voltages being of opposite polarities, and a double-pole, double-throw switch connected between said third means and said ON and OFF circuits, said second means including a start switch which disables said second means until said start switch is actuated.
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |