US3594614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energizing circuit for the dc operating winding of an electromagnetic contactor or the like
Assignee: Cutler Hammer Inc
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Filing: 1970-02-26
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Granted: 1971-07-20
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Expires: 1990-02-26
Abstract
Abstract An improved circuit for energizing and quickly deenergizing the DC operating winding of an electromagnetic contactor from sources of AC supply having a wide range of frequencies. It employs a full wave rectifier bridge, an auxiliary electromagnetic switch having a pair of low-inductance operating windings and normally open contacts. One of the auxiliary switch windings of high resistance is connected across the DC output terminals of the rectifier bridge while the other thereof of low resistance is connected across the same terminal in series with the normally open contacts and the operating winding of the electromagnetic contactor.
Inventors
- 👤 Werner B Halbeck
- 👤 John A Quaal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:13
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/18; H01F7/1805
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
In combination: a. a full wave rectifier bridge having input terminals for connection to and disconnection from a source of alternating potential and a pair of unidirectional current output terminals; b. a first electromagnetic device having an energizing coil; c. a second electromagnetic device having a first energizing coil connected across the rectifier bridge output terminals, a second energizing coil, and normally open contacts connected in series with said second energizing coil and the energizing coil of said first electromagnetic device across said rectifier bridge output terminals; d. said coils of said second electromagnetic device having inductive time constants substantially less than that of the energizing coil of said first electromagnetic device to afford, upon interruption of input potential to said bridge, rapid opening of its associated contacts and subsequent rapid dissipation of stored inductive energy in the energizing coil of said first electromagnetic device.
Claim 2
Dependent Claim
145 words
In combination: a. a full wave rectifier bridge having input terminals for connection to and disconnection from a source of alternating potential and a pair of unidirectional current output terminals; b. a first electromagnetic device having an energizing coil; c. a second electromagnetic device having a first energizing coil connected across the rectifier bridge output terminals, a second energizing coil, and normally open contacts connected in series with said second energizing coil and the energizing coil of said first electromagnetic device across said rectifier bridge output terminals; d. said coils of said second electromagnetic device having inductive time constants substantially less than that of the energizing coil of said first electromagnetic device to afford, upon interruption of input potential to said bridge, rapid opening of its associated contacts and subsequent rapid dissipation of stored inductive energy in the energizing coil of said first electromagnetic device.
Claim 3
Dependent Claim
46 words
The combination according to claim 1, wherein said first energizing coil of said second electromagnetic device is of high resistance and said second energizing coil is of low resistance and both are of relatively low inductance compared to the energizing coil of said first electromagnetic device.
Claim 4
Dependent Claim
37 words
The combination according to claim 1, wherein the normally open contacts of said second electromagnetic are of the enclosed reed switch type and wherein said first and second energizing coils are concentrically disposed about said reed switch.
Claim 5
Dependent Claim
122 words
The combination with an electromagnetic contactor or the like having a pair of parallel, spaced apart operating coils and a movable armature, of means for energizing said coils with unidirectional current derived from a source of AC supply, comprising: a. a full wave rectifier bridge; b. an auxiliary electromagnetic switch having contacts sealed within a casing, first and second energizing coils concentrically disposed about said casing with the first coil connected directly across the output terminals of said rectifier bridge and the second coil connected in series with its associated contacts and the series connected operating coils of said contactor across said output terminals; c. said auxiliary electromagnetic switch being disposed in proximity to and between said operating coils of said contactor.
Claim 6
Dependent Claim
122 words
The combination with an electromagnetic contactor or the like having a pair of parallel, spaced apart operating coils and a movable armature, of means for energizing said coils with unidirectional current derived from a source of AC supply, comprising: a. a full wave rectifier bridge; b. an auxiliary electromagnetic switch having contacts sealed within a casing, first and second energizing coils concentrically disposed about said casing with the first coil connected directly across the output terminals of said rectifier bridge and the second coil connected in series with its associated contacts and the series connected operating coils of said contactor across said output terminals; c. said auxiliary electromagnetic switch being disposed in proximity to and between said operating coils of said contactor.
Claim 7
Dependent Claim
46 words
The combination according to claim 4 wherein the auxiliary switch energizing coils are encapsulated in an annular nonmagnetic casing and the switch contacts are in a sealed envelope disposed within said annular casing, and wherein the auxiliary switch assembly is surrounded by an annular iron member.
References Cited (Backward Citations)
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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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |