US3629679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear motor power failure detection circuit and fail-safe control
Assignee: Information Storage Systems Inc
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Filing: 1970-06-29
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Granted: 1971-12-21
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Expires: 1990-06-29
Abstract
Abstract A circuit for controlling an actuator including means for setting the actuator for movement to a rest position in response to an interruption in the electrical power supplied, with the actuator being energized after the power interruption by energy stored in the circuit normally used for regulating the circuit waveform.
Inventors
- 👤 Martin O Halfhill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:40
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20; H; H02; H02H; H02H3/00; H02H3/24; H02H9/00; H02H9/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
142 words
An electrical circuit for energizing a driven load from an alternating current supply wherein the load must be driven to a rest position when the supply is interrupted, said circuit comprising: a first circuit for supplying energy from the supply to the load and being adjustable for driving the load to the rest position, a second circuit adapted to resonate at the supply frequency to regulate the voltage supplied to the load and including an energy storage device electrically coupled to the first circuit, means to sense the time differential between predetermined points on adjacent half-cycles of the alternating current supply waveform, and means to adjust said first circuit for driving the load to the rest position when the time differential exceeds a predetermined value whereby the first circuit utilizes the energy stored by the energy storage device to drive the load.
Claim 2
Dependent Claim
142 words
An electrical circuit for energizing a driven load from an alternating current supply wherein the load must be driven to a rest position when the supply is interrupted, said circuit comprising: a first circuit for supplying energy from the supply to the load and being adjustable for driving the load to the rest position, a second circuit adapted to resonate at the supply frequency to regulate the voltage supplied to the load and including an energy storage device electrically coupled to the first circuit, means to sense the time differential between predetermined points on adjacent half-cycles of the alternating current supply waveform, and means to adjust said first circuit for driving the load to the rest position when the time differential exceeds a predetermined value whereby the first circuit utilizes the energy stored by the energy storage device to drive the load.
Claim 3
Dependent Claim
51 words
An electrical circuit as defined in claim 1 wherein said sensing means includes a capacitor and switching means to charge and discharge the capacitor by amounts proportional to the supply waveform and charging level detecting mans to signal when the capacitor charge exceeds predetermined limits to thereby indicate the time differential.
Claim 4
Dependent Claim
58 words
An electrical circuit as defined in claim 1 having a third circuit including a motor energized by the alternating current supply and being electrically coupled to the first circuit whereby with an interruption of the supply current, the motor back e.m.f. voltage is utilized to help energize the first circuIt for driving the load to the rest position.
Claim 5
Dependent Claim
37 words
An electrical circuit as defined in claim 2 including an energy storage device in the first circuit for receiving energy from the second circuit energy storage device and energizing the load during a supply current interrupt condition.
Claim 6
Dependent Claim
128 words
An electrical circuit for supplying electrical power from an alternating current supply to a load, which load must be set for movement to a rest position with any interruption in the electrical power supplied to the circuit, said circuit comprising: a transformer having a secondary winding for supplying electrical energy to said load, an energy storing tuned circuit electrically coupled for regulation of the voltage supplied to the load, detection means for signaling any interruption in the electrical power supplied to the load, means to set the load for movement to the rest position in response to said detection means signaling whereby the load will be powered by the energy stored in the tuned circuit for movement to the rest position immediately when the electrical power is interrupted.
Claim 7
Dependent Claim
128 words
An electrical circuit for supplying electrical power from an alternating current supply to a load, which load must be set for movement to a rest position with any interruption in the electrical power supplied to the circuit, said circuit comprising: a transformer having a secondary winding for supplying electrical energy to said load, an energy storing tuned circuit electrically coupled for regulation of the voltage supplied to the load, detection means for signaling any interruption in the electrical power supplied to the load, means to set the load for movement to the rest position in response to said detection means signaling whereby the load will be powered by the energy stored in the tuned circuit for movement to the rest position immediately when the electrical power is interrupted.
Claim 8
Dependent Claim
28 words
An electrical circuit as defined in claim 5 wherein said tuned circuit is connected to a secondary winding of the transformer for regulation of the transformer output voltage.
Claim 9
Dependent Claim
49 words
An electrical circuit as defined in claim 5 wherein said detection means includes means to sense the time differential between predetermined points on adjacent half-cycles of the alternating current supply waveform and to signal an interruption in the electrical power supplied when the time differential exceeds a predetermined value.
References Cited (Backward Citations)
US3405337A
Cited
US3483455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |