US3634701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Static transfer switching system
Assignee: Borg Warner Corp
•
Filing: 1969-10-16
•
Granted: 1972-01-11
•
Expires: 1989-10-16
Abstract
Abstract A static transfer system includes a first switch for connecting a normally used AC source to a lead and a second switch for connecting a standby source to the lead. A sensor is connected to an AC sine wave reference source for comparing at every instant of time the normal AC sine wave signal to the reference source signal and feeding an error signal to a logic circuit at any instant in time when the normal source signal falls below the reference signal. The logic circuit is effective to instantaneously connect the load to the standby source and disconnect the load from the normal source irrespective of the load power factor, and to reconnect the load to the normal source and disconnect the standby source from the load when the normal source is again capable of handling the load.
Inventors
- 👤 George H Studtmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:40
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/04; H02J9/06; H02H; H02H3/00; H02H3/26; H02H3/36; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/725; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y04; Y04S; Y04S20/00; Y04S20/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
A circuit for providing an AC sine wave reference signal synchronized to a base AC signal received over an AC energizinG circuit, comprising switching means connected to provide a substantially square wave signal, a filter arrangement coupled to said switching means for producing a sine wave reference signal related in time to said square wave signal, and circuit means, including a phase adjust circuit, coupling said switching means to the AC energizing circuit over which the base AC signal is received for driving said switching means in timed relation with the base AC signal, which phase adjust circuit includes an adjustable component to provide (affords) a controlled phase shift of the signal which drives the switching means to effect phase synchronism between said AC reference signal and the base AC signal received over the input line.
Claim 2
Dependent Claim
136 words
A circuit for providing an AC sine wave reference signal synchronized to a base AC signal received over an AC energizinG circuit, comprising switching means connected to provide a substantially square wave signal, a filter arrangement coupled to said switching means for producing a sine wave reference signal related in time to said square wave signal, and circuit means, including a phase adjust circuit, coupling said switching means to the AC energizing circuit over which the base AC signal is received for driving said switching means in timed relation with the base AC signal, which phase adjust circuit includes an adjustable component to provide (affords) a controlled phase shift of the signal which drives the switching means to effect phase synchronism between said AC reference signal and the base AC signal received over the input line.
Claim 3
Dependent Claim
102 words
A circuit for providing an AC sine wave reference signal as claimed in claim 1, in which said switching means comprises a pair of switching elements each having respective input connections, and in which said circuit means for coupling the AC energizing circuit with the switching means includes a subcircuit responsive to a first half cycle of the base AC signal to drive one of said switching elements to conduction, and responsive to a second half cycle of a polarity opposite that of the first half cycle of the base AC signal to drive the other of said switching elements to conduction.
Claim 4
Dependent Claim
44 words
A circuit for providing an AC sine wave reference signal as claimed in claim 1, and further comprising means, coupled to said filter circuit, for providing an adjustable level energizing signal and thus adjusting the magnitude of the AC sine wave reference signal produced.
Claim 5
Dependent Claim
54 words
A circuit for providing an AC sine wave reference signal as claimed in claim 1, and further comprising a sensor circuit, connected to receive the AC reference signal and the base AC signal, and to provide an output error signal responsive to disparity between the AC base signal and AC sine wave reference signal.
References Cited (Backward Citations)
US2656509A
Cited
US3125726A
Cited
FR1235644A
Cited
US3072854A
Cited
US3051905A
Cited
US3121843A
Cited
US3168702A
Cited
US3218575A
Cited
US3286176A
Cited
US3502911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |