Patent US3390003A successfully refreshed from Google Patents.
Patent US4630165A successfully refreshed from Google Patents.
US4630165A
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US
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D.C. power control for D.C. solenoid actuators
Assignee: Parker Hannifin Customer Support Inc
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Filing: 1985-10-10
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Granted: 1986-12-16
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Expires: 2005-10-10
Abstract
Abstract A D.C. power control for a D.C. solenoid actuator which may be used for a D.C. solenoid operated valve uses a timer circuit for switching from an initial high pull-in power after a predetermined delay to a low hold power for the valve solenoid utilizing a pulse control where the valve "on" time is held constant and the "off" time is varied. The pulses are high frequency to prevent the valve from switching with each of the pulses while enabling the average current in the valve solenoid coil to be controlled independently between the pull-in and hold current values.
Inventors
- 👤 Anthony D'Onofrio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:52
CPC Classifications
H; H01; H01H; H01H47/00; H01H47/22; H01H47/32; H01H47/325
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
54 words
A D.C. power control circuit comprising means for selectively providing a sequence of high frequency current pulses, circuit means for applying the pulses to a D.C. operated electromagnetic solenoid and means for reducing the number of pulses applied to the solenoid after an initial full number of pulse applications during a predetermined time interval.
Claim 2
Dependent Claim
54 words
A D.C. power control circuit comprising means for selectively providing a sequence of high frequency current pulses, circuit means for applying the pulses to a D.C. operated electromagnetic solenoid and means for reducing the number of pulses applied to the solenoid after an initial full number of pulse applications during a predetermined time interval.
Claim 3
Dependent Claim
19 words
A control circuit as set forth in claim 1 wherein said means for providing includes a free-running oscillator means.
Claim 4
Dependent Claim
19 words
A control circuit as set forth in claim 1 wherein the pulse sequence has a frequency of 2 kHz.
Claim 5
Dependent Claim
23 words
A control circuit as set forth in claim 1 wherein said time interval is approximately two times the pull-in time of the solenoid.
Claim 6
Dependent Claim
43 words
A control circuit as set forth in claim 1 wherein said means for providing includes an oscillator means and said means for reducing includes means for interrupting the operation of said source to eliminate a predetermined number of the pulses from said source.
Claim 7
Dependent Claim
29 words
A control circuit as set forth in claim 1 wherein said means for providing includes input means responsive to an input control signal for initiating the high frequency pulses.
Claim 8
Dependent Claim
66 words
A D.C. power control circuit for a solenoid operated D.C. valve comprising means for selectively providing a sequence of high frequency current pulses, a D.C. solenoid coil for operating a valve, circuit means for applying the pulses to said solenoid coil and means for reducing the number of pulses applied to the solenoid after an initial full number of pulse applications during a predetermined time interval.
Claim 9
Dependent Claim
66 words
A D.C. power control circuit for a solenoid operated D.C. valve comprising means for selectively providing a sequence of high frequency current pulses, a D.C. solenoid coil for operating a valve, circuit means for applying the pulses to said solenoid coil and means for reducing the number of pulses applied to the solenoid after an initial full number of pulse applications during a predetermined time interval.
Claim 10
Dependent Claim
19 words
A control circuit as set forth in claim 7 wherein said means for providing includes a free-running oscillator means.
Claim 11
Dependent Claim
19 words
A control circuit as set forth in claim 7 wherein the pulse sequence has a frequency of 2 kHz.
Claim 12
Dependent Claim
23 words
A control circuit as set forth in claim 7 wherein said time interval is approximately two times the pull-in time of the solenoid.
Claim 13
Dependent Claim
43 words
A control circuit as set forth in claim 7 wherein said means for providing includes an oscillator means and said means for reducing includes means for interrupting the operation of said source to eliminate a predetermined number of the pulses from said source.
Claim 14
Dependent Claim
29 words
A control circuit as set forth in claim 7 wherein said means for providing includes input means responsive to an input control signal for initiating the high frequency pulses.
Claim 15
Independent Claim
41 words
A method for supplying D.C. power to an electromagnetic solenoid actuator including the steps of initially supplying a number of D.C. current pulses to the actuator and after a predetermined time interval reducing the number of pulses applied to the solenoid.
Claim 16
Independent Claim
41 words
A method for supplying D.C. power to an electromagnetic solenoid actuator including the steps of initially supplying a number of D.C. current pulses to the actuator and after a predetermined time interval reducing the number of pulses applied to the solenoid.
Claim 17
Independent Claim
48 words
A method for applying D.C. power to a solenoid operated D.C. valve including the steps of initially supplying a number of D.C. current pulses to the solenoid operator of the D.C. valve and after a predetermined time interval reducing the number of pulses applied to the solenoid operator.
Claim 18
Independent Claim
48 words
A method for applying D.C. power to a solenoid operated D.C. valve including the steps of initially supplying a number of D.C. current pulses to the solenoid operator of the D.C. valve and after a predetermined time interval reducing the number of pulses applied to the solenoid operator.
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) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |