US4728807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power source system comprising a plurality of power sources having negative resistance characteristics
Assignee: NEC Corp
•
Filing: 1985-08-01
•
Granted: 1988-03-01
•
Expires: 2005-08-01
Abstract
Abstract In a power source system for supplying a load with a load voltage and a load current, a plurality of power sources share the load at rates of load sharing and have negative resistance characteristics. When the power sources are connected together in series, the rates are determined by source voltages produced by the respective power sources which also produce d.c. currents. Each d.c. current increases with an increment of each rate so as to specify each negative resistance characteristic. A control circuit is included in each power source to control the d.c. current and may be a combination of a current detector (60a, 60b) and a resistor (56a, 56b). Alternatively, the rates are determined by source currents produced by the respective power sources which also produce d.c. voltages when the power sources are connected together in parallel. The d.c. voltages are controlled by control circuits to specify the negative resistance characteristics so that each d.c. voltage increases with an increment of each source current. Each negative resistance characteristic may be changed to a positive resistance characteristic at a preselected one of each rate.
Inventors
- 👤 Yoshihiko Harafuji
- 👤 Hideki Yamamoto
- 👤 Tsutomu Ogata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:49
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/59
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
218 words
A power source system for supplying a load with a load voltage and a load current, said system comprising a plurality of power sources, each of said power sources producing a source voltage and a source current, and coupling means for coupling said power source together in series with said load in order to deliver the source voltages of the respective power sources to said load as said load voltages, with rates determined by the source voltages of the respective power sources and with the source current of each of said power sources being variable when each of said rates is varied between low and high normalized values, each power source comprising: an electric source for producing said source current as a source signal; and detecting means coupled to said electric source for detecting said source signal to produce first and second currents in accordance with a negative resistance characteristic which is such that the source current increases when the rate increases from said low normalized value toward said high normalized value; producing means for producing the first current as said load current; and a resistor through which said second current is caused to flow and across which a shared voltage is developed, as said source voltage, said shared voltage providing voltage of each of said power sources.
Claim 2
Dependent Claim
218 words
A power source system for supplying a load with a load voltage and a load current, said system comprising a plurality of power sources, each of said power sources producing a source voltage and a source current, and coupling means for coupling said power source together in series with said load in order to deliver the source voltages of the respective power sources to said load as said load voltages, with rates determined by the source voltages of the respective power sources and with the source current of each of said power sources being variable when each of said rates is varied between low and high normalized values, each power source comprising: an electric source for producing said source current as a source signal; and detecting means coupled to said electric source for detecting said source signal to produce first and second currents in accordance with a negative resistance characteristic which is such that the source current increases when the rate increases from said low normalized value toward said high normalized value; producing means for producing the first current as said load current; and a resistor through which said second current is caused to flow and across which a shared voltage is developed, as said source voltage, said shared voltage providing voltage of each of said power sources.
Claim 3
Dependent Claim
79 words
A power source system as claimed in claim 1, wherein said detecting means is coupled to said electric source and comprises: current delivering means having said negative resistance characteristic for delivering said first and said second currents to said providing means and to said resistor, respectively; and control signal supplying means coupled to said current delivering means and to said electric source for supplying said electric source with a control voltage dependent on said first and said second currents.
Claim 4
Dependent Claim
116 words
A power source system as claimed in claim 1, wherein said detecting means of each power source comprises: first means for monitoring the source voltage of each of said power sources to detect whether or not the rate of the source voltage of each of said power sources exceeds a preselected value between said low and said high normalized values; and second means coupled to said first means for producing said source voltage and source current, in accordance with said negative resistance characteristic between said low normalized value and said preselected value and in accordance with a positive resistance characteristic which is different from said negative resistance characteristic between said preselected and said high normalized values.
Claim 5
Dependent Claim
221 words
A power source system for supplying a load with a load voltage and a load current, said system comprising a plurality of power sources, each of said power sources producing a source voltage and a source current, and coupling means for coupling said plurality of the power sources in parallel with said load in order to deliver the source currents of the respective power sources to said load as said load current, with rates determined by the source currents of the respective power sources and with the source voltage of each of said power sources left variable when each of said rates is varied between low and high normalized values, each power source comprising: an electric source for producing a d.c. source voltage; a resistor through which a d.c. current is caused to flow from said source current and across which said source voltage appears in response to said d.c. voltage, said d.c. current providing the rate of each of said power sources; and detection means coupled to said electric source for detecting said d.c. current to supply a control signal to said electric source in response to said d.c. current, in order to provide a negative resistance characteristic which is such that the source voltage increases when the rate increases from said low normalized value toward said high normalized value.
Claim 6
Dependent Claim
221 words
A power source system for supplying a load with a load voltage and a load current, said system comprising a plurality of power sources, each of said power sources producing a source voltage and a source current, and coupling means for coupling said plurality of the power sources in parallel with said load in order to deliver the source currents of the respective power sources to said load as said load current, with rates determined by the source currents of the respective power sources and with the source voltage of each of said power sources left variable when each of said rates is varied between low and high normalized values, each power source comprising: an electric source for producing a d.c. source voltage; a resistor through which a d.c. current is caused to flow from said source current and across which said source voltage appears in response to said d.c. voltage, said d.c. current providing the rate of each of said power sources; and detection means coupled to said electric source for detecting said d.c. current to supply a control signal to said electric source in response to said d.c. current, in order to provide a negative resistance characteristic which is such that the source voltage increases when the rate increases from said low normalized value toward said high normalized value.
Claim 7
Dependent Claim
119 words
A power source system as claimed in claim 4, wherein said detection means of each power source comprises: first means for monitoring said d.c. current of each of said power sources to detect whether or not the rate of the d.c. current of each of said power sources exceeds a preselected value between said low and said high normalized values; and second means coupled to said first means for producing said control signal such that said source voltage increases in accordance with said negative resistance characteristic between said low normalized value and said preselected value and in accordance with a positive resistance characteristic which is different from said negative resistance characteristic between said preselected and said high normalized values.
References Cited (Backward Citations)
US3297880A
Cited
US3293444A
Cited
US3343067A
Cited
US3428820A
Cited
US3696286A
Cited
US3689776A
Cited
US3738371A
Cited
US3768012A
Cited
US3808452A
Cited
US3922559A
Cited
US3912940A
Cited
US3956638A
Cited
US4449057A
Cited
US4492919A
Cited
US4476399A
Cited
US4429233A
Cited
JPH118543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |