Patent US3573483A successfully refreshed from Google Patents.
US3573483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply control apparatus
Assignee: RTX Corp
•
Filing: 1969-05-02
•
Granted: 1971-04-06
•
Expires: 1989-05-02
Abstract
Abstract In the event a primary voltage source fails, an auxiliary voltage source may be provided to a load by a battery and an isolating transistor that conducts current to the load from the battery. The isolating transistor is controlled by a first control circuit that causes the transistor to conduct if the voltage produced by the primary voltage source decreases below a predetermined value. The isolating transistor is also controlled by a second control circuit that returns the isolating transistor to its nonconductive state if the voltage produced by the battery decreases below a predetermined value. Both the first and second control circuits preferably comprise a Zener diode and a resistor.
Inventors
- 👤 Gregory C White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:08
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/061
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
221 words
Apparatus for controlling the connection of an auxiliary voltage source to a load in the event of failure of a primary voltage source that normally supplies the load, said apparatus comprising in combination: variable resistance semiconductor means having a conductive state and a nonconductive state; a first voltage reference diode connected between the primary voltage source and the variable resistance semiconductor means for causing the variable resistance semiconductor means to switch from a first to a second of its states in the event that the voltage produced by the primary voltage source decreases below a predetermined value; isolating semiconductor means responsive to the variable resistance semiconductor means for operatively disconnecting the auxiliary voltage source from the load when the variable resistance semiconductor means is in the first of its states and for operatively connecting the auxiliary voltage source to the load in response to the switching of said variable resistance semiconductor means to the second of its states; and a second voltage reference diode connected between said auxiliary voltage source and said variable resistance semiconductor means for causing said variable resistance semiconductor means to return to the first of its states when the voltage produced by the auxiliary voltage source decreases below a second predetermined voltage so that the isolating semiconductor means operatively disconnects said auxiliary voltage source from said load.
Claim 2
Dependent Claim
221 words
Apparatus for controlling the connection of an auxiliary voltage source to a load in the event of failure of a primary voltage source that normally supplies the load, said apparatus comprising in combination: variable resistance semiconductor means having a conductive state and a nonconductive state; a first voltage reference diode connected between the primary voltage source and the variable resistance semiconductor means for causing the variable resistance semiconductor means to switch from a first to a second of its states in the event that the voltage produced by the primary voltage source decreases below a predetermined value; isolating semiconductor means responsive to the variable resistance semiconductor means for operatively disconnecting the auxiliary voltage source from the load when the variable resistance semiconductor means is in the first of its states and for operatively connecting the auxiliary voltage source to the load in response to the switching of said variable resistance semiconductor means to the second of its states; and a second voltage reference diode connected between said auxiliary voltage source and said variable resistance semiconductor means for causing said variable resistance semiconductor means to return to the first of its states when the voltage produced by the auxiliary voltage source decreases below a second predetermined voltage so that the isolating semiconductor means operatively disconnects said auxiliary voltage source from said load.
Claim 3
Dependent Claim
38 words
Apparatus, as claimed in claim 1, wherein said variable resistance semiconductor means comprises a transistor including a base electrode connected to said first voltage reference diode and including an emitter electrode connected to said second voltage reference diode.
Claim 4
Dependent Claim
57 words
Apparatus, as claimed in claim 2, wherein said isolating semiconductor means comprises a transistor having a base electrode connected through a resistor to the cathode of said second voltage reference diode, having an emitter electrode connected through a resistor to said cathode, and having a collector-emitter junction connected in series between the primary and auxiliary voltage sources.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |