US3896355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-powered thyristor trigger circuit
Assignee: Honeywell Inc
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Filing: 1974-06-13
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Granted: 1975-07-22
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Expires: 1994-06-13
Abstract
Abstract A power control circuit includes first and second triacs each having a pair of load terminals connected across a pair of alternating current supply terminals in series with an individually associated winding of a split phase capacitor alternating current motor, and control circuit means for providing a unidirectional gating potential for said triacs in a low-loss non-heat producing or power dissipating manner comprising a filter capacitor having a first terminal connected to the junction of one of the supply terminals a load terminal of each of said triacs, said filter capacitor having a second terminal connected to the other power supply terminals by first and second circuits each of which circuits include a current limiting capacitor and a rectifier, and switching means selectively operable to apply said potential to the control gate of one or the other of said triacs.
Inventors
- 👤 Eugene H Guicheteau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:35
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/26; H02P1/40; H02P1/42; H02P1/44
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
197 words
A power control circuit including in combination first and second semiconductor load carrying gate controlled conducting devices each having a pair of load terminals connected in series circuit relationship with an individually associated inductive impedance load across a pair of alternating current power supply terminals, and control circuit means coupled to and controlling said gate controlled conducting devices comprising means for providing a unidirectional gating potential, said last mentioned means comprising a filter capacitor having a first terminal connected to the junction of one of said power supply terminals and one of said load terminals of each of said gate controlled conductive devices, said filter capacitor having a second terminal connected by first and second circuits to the other one of said power supply terminals, each of said first and second circuits including a rectifier, a current limiting capacitor and an associated one of said load devices, and gating means operatively coupled to said filter capacitor anD selectively operable to be coupled to the control gate of one or the other of said load current carrying gate controlled conducting devices for applying a gating-on signal to said device to cause the same to conduct load current therethrough.
Claim 2
Dependent Claim
197 words
A power control circuit including in combination first and second semiconductor load carrying gate controlled conducting devices each having a pair of load terminals connected in series circuit relationship with an individually associated inductive impedance load across a pair of alternating current power supply terminals, and control circuit means coupled to and controlling said gate controlled conducting devices comprising means for providing a unidirectional gating potential, said last mentioned means comprising a filter capacitor having a first terminal connected to the junction of one of said power supply terminals and one of said load terminals of each of said gate controlled conductive devices, said filter capacitor having a second terminal connected by first and second circuits to the other one of said power supply terminals, each of said first and second circuits including a rectifier, a current limiting capacitor and an associated one of said load devices, and gating means operatively coupled to said filter capacitor anD selectively operable to be coupled to the control gate of one or the other of said load current carrying gate controlled conducting devices for applying a gating-on signal to said device to cause the same to conduct load current therethrough.
Claim 3
Dependent Claim
19 words
A power control circuit as specified in claim 1 including a voltage limiting diode connected across said filter capacitor.
Claim 4
Dependent Claim
40 words
A power control circuit as specified in claim 2 including a current limiting resistor connected in circuit with said gating means to limit the gating signal adapted to be applied by said gating means to said gate control conducting devices.
Claim 5
Dependent Claim
32 words
A power control circuit as specified in claim 1 including a capacitor connected between the junction of each of said loads and the associated load terminal of said gate control conducting devices.
Claim 6
Dependent Claim
24 words
A power control circuit as specified in claim 4 wherein said inductive impedance loads comprise the windings of a split capacitor reversible electrical motor.
Claim 7
Dependent Claim
52 words
A power control circuit as specified in claim 5 wherein said gating means include a switch associated with each of said gate controlled conduction devices, which switch is operable when closed to apply a gating signal to the device individually associated therewith to cause the said device to conduct load current therethrough.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |