US3849665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Short circuit protected master-slave power supply
Assignee: RTX Corp
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Filing: 1973-10-01
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Granted: 1974-11-19
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Expires: 1993-10-01
Abstract
Abstract A master-slave power supply has a threshold detector on the slave supply to detect loading of the slave supply sufficient to lower its voltage below a threshold level, following which the master supply is variably clamped in response to a linear function of the slave supply output voltage as well as some function of the master supply voltage, thereby to provide slaving of the master supply to the slave supply in response to overload conditions. The variable clamping is effected in one disclosed embodiment by providing a control voltage to a clamp input of a standard operational amplifier, and in another embodiment by providing the control voltage to a separate clamping circuit.
Inventors
- 👤 J Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:52
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/577; G05F1/585
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
196 words
A short circuit protected master/slave power supply comprising: a master power supply; a slave power supply connected for response to said master power supply; control means connected to the output of said slave power supply for detecting a reduction in its output voltage in excess of a given magnitude and for generating a control signal related to the output voltage of said slave supply, said control means including: reference means providing a voltage reference having a magnitude lower than that of the nominal output of said power supply by an amount of voltage related to said given magnitude of voltage reduction; a voltage divider connected between the output of said master power supply and said reference means; a normally reverse-biased diode connected from a first point in said voltage divider to the output of said slave power supply; and a transistor having its base connected to a second point in said voltage divider, the current through said transistor providing said control signal; and means included within said master power supply and connected for response to said control means for clamping the output of said master power supply in a manner substantially proportional to said control signal.
Claim 2
Dependent Claim
196 words
A short circuit protected master/slave power supply comprising: a master power supply; a slave power supply connected for response to said master power supply; control means connected to the output of said slave power supply for detecting a reduction in its output voltage in excess of a given magnitude and for generating a control signal related to the output voltage of said slave supply, said control means including: reference means providing a voltage reference having a magnitude lower than that of the nominal output of said power supply by an amount of voltage related to said given magnitude of voltage reduction; a voltage divider connected between the output of said master power supply and said reference means; a normally reverse-biased diode connected from a first point in said voltage divider to the output of said slave power supply; and a transistor having its base connected to a second point in said voltage divider, the current through said transistor providing said control signal; and means included within said master power supply and connected for response to said control means for clamping the output of said master power supply in a manner substantially proportional to said control signal.
Claim 3
Dependent Claim
43 words
A short circuit protected master/slave power supply according to claim 1 wherein said master power supply includes an operational amplifier having a reference input and said control signal is applied to saId reference input for clamping the output voltage of said operational amplifier.
Claim 4
Dependent Claim
85 words
A short circuit protected master/slave power supply according to claim 1 wherein said master power supply includes an operational amplifier and a buffer amplifier and a variable clamp circuit connected from the output of said operational amplifier to the input of said buffer amplifier, the output of said buffer amplifier comprising the output of said power supply, said variable clamp circuit being connected for response to said control means and providing clamping of the output of said operational amplifier in proportion to said control signal.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |