US4072889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronically stabilized feeder device for the supply of DC current
Assignee: DR K WITMER ELEKTRONIK AG
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Filing: 1976-09-02
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Granted: 1978-02-07
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Expires: 1996-09-02
Abstract
Abstract An electronically stabilized feeder device for supplying regulated DC current to a load includes circuitry for adjusting the load voltage to a selected value, circuitry for adjusting the load current to a selected value, and circuitry responsive to load current to limit load voltage and thereby limit the power supplied to the load to the selected value and to reduce load voltage to its lowest value regardless of selected values in the event of a short circuit.
Inventors
- 👤 Kurt Witmer
- 👤 Roland Cachin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:18
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/565; G05F1/569; G05F1/573; G05F1/563; Y; Y10; Y10S; Y10S323/00; Y10S323/902
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
212 words
An electrically stabilized feeder device for supplying direct current to a load through a load circuit comprising: power supply means for supply DC voltage to said load circuit; regulating means connected at least partly seially in said load circuit; control selecting means connected to operate said regulating means; an adjustable load current controlling means connected to said control selecting means, said load current controlling means operating to limit the current to said load circuit to a selected predetermined value; an adjustable load voltage controlling means connected to said control selecting means, said load voltage controlling means operating to maintain, under certain conditions, the load voltage at a selected predetermined value; and power controlling means connected to said control selecting means, said power controlling means being responsive to output power, formed by the product of said current in said load circuit and of said load voltage; said control selecting means effecting operation of said regulating means when said power controlling means senses a power which is at least approximately like a specified maximum power limit, to automatically alter either the load voltage value or the value of said current in the load circuit, in dependency of which of these values being externally set to ensure that the maximum power limit is not exceeded.
Claim 2
Dependent Claim
212 words
An electrically stabilized feeder device for supplying direct current to a load through a load circuit comprising: power supply means for supply DC voltage to said load circuit; regulating means connected at least partly seially in said load circuit; control selecting means connected to operate said regulating means; an adjustable load current controlling means connected to said control selecting means, said load current controlling means operating to limit the current to said load circuit to a selected predetermined value; an adjustable load voltage controlling means connected to said control selecting means, said load voltage controlling means operating to maintain, under certain conditions, the load voltage at a selected predetermined value; and power controlling means connected to said control selecting means, said power controlling means being responsive to output power, formed by the product of said current in said load circuit and of said load voltage; said control selecting means effecting operation of said regulating means when said power controlling means senses a power which is at least approximately like a specified maximum power limit, to automatically alter either the load voltage value or the value of said current in the load circuit, in dependency of which of these values being externally set to ensure that the maximum power limit is not exceeded.
Claim 3
Dependent Claim
35 words
A feeder device according to claim 1 wherein said power supply means is operative to alter its output DC voltage, in response to said load voltage, to minimize internal voltage drops and, therefore, power dissipation.
Claim 4
Dependent Claim
29 words
A feeder device according to claim 1 wherein said load current controlling means comprises voltage comparator means for comparing a setable reference voltage to a load current dependent voltage.
Claim 5
Dependent Claim
30 words
A feeder device according to claim 3 wherein said voltage comparator means includes a difference amplifier connected to potentiometer means and resistance means serially connected in said load current circuit.
Claim 6
Dependent Claim
31 words
A feeder device according to claim 1 wherein said voltage controlling means comprises voltage comparator means for comparing a setable reference voltage to a voltage dependent on the device output voltage.
Claim 7
Dependent Claim
35 words
A feeder device according to claim 5 wherein said voltage comparator means comprises a difference amplifier connected to potentiometer means and to a device output, said potentiometer means being fed by a constant current source.
Claim 8
Dependent Claim
32 words
A feeder device according to claim 1 wherein said power controlling means comprises voltage comparator means for comparing at least one reference voltage to a voltage dependent on the device output voltage.
Claim 9
Dependent Claim
20 words
A feeder device according to claim 2 wherein said power supply is electronically switchable to alter its output voltage stepwise.
Claim 10
Dependent Claim
53 words
A feeder device according to claim 2 wherein said power controlling means comprises voltage comparator means for comparing at least one reference voltage to a voltage dependent on the device output voltage, the output voltage of said comparator means acting on the control selecting means as well as on the power supply means.
Claim 11
Dependent Claim
42 words
A feeder device according to claim 9 wherein said power controlling means comprises first voltage comparator means, said control selecting means comprising second voltage comparator means for comparing the output voltage of said first comparator means to a load current dependent voltage.
Claim 12
Dependent Claim
28 words
A feeder device according to claim 10 wherein said current controlling means comprises voltage comparator means for comparing a setable reference voltage to the load current dependent voltage.
Claim 13
Dependent Claim
17 words
A feeder device according to claim 10 wherein said second voltage comparator means controls said regulating means.
Claim 14
Dependent Claim
55 words
A feeder device according to claim 10 wherein said voltage controlling means comprises third voltage comparator means for comparing a setable reference voltage to a voltage dependent on the device output voltage, said regulating means comprising a controlled shunt element to shunt said setable reference voltage, said second voltage comparator means controlling said shunt element.
Claim 15
Dependent Claim
16 words
A feeder device according to claim 10 wherein said second voltage comparator means is a transistor.
Claim 16
Dependent Claim
32 words
A feeder device according to claim 13 comprising potentiometer means as the setting element for said reference voltage, and a transistor as shunt element, both being fed by a constant current source.
Claim 17
Dependent Claim
62 words
A feeder device according to claim 9 wherein said power controlling means comprises threshold level sensitive means connected to the output of the voltage comparator means to select, according to a comparison of the output voltage of said comparator means to the threshold level, whether said output voltage is being fed to the power supply means or to the control selection means.
Claim 18
Dependent Claim
54 words
A feeder device according to claim 16 wherein said power supply is switchable to alter its output volage stepwise, the output voltage of the comparator means switching the power supply output voltage to higher level if applied thereto by the threshold sensitive means, said output voltage being fed alternately to the control selecting means.
Claim 19
Dependent Claim
91 words
A feeder device according to claim 17 wherein said power controlling means comprises first voltage comparator means, said control selecting means comprising second comparator means for comprising the output voltage of said first comparator means to a load dependent voltage, the output voltage of said first comparator means acting in opposition to said load dependent voltage on said second comparator means, said second comparator means controlling the regulating means for lower device output voltage limit and higher load current limit with rising of the output voltage of said first comparator means.
Claim 20
Dependent Claim
35 words
A feeder device according to claim 2 wherein said power control means comprises at least two voltage comparators with different reference voltages, the output voltages of said comparators acting additively on said control selecting means.
Claim 21
Dependent Claim
41 words
A feeder device according to claim 9 wherein said voltage comparator means is feedback coupled when its output is connected to said control selecting means, and is working with open loop when its output is connected to the power supply control.
Claim 22
Dependent Claim
45 words
A feeder device according to claim 16 wherein said threshold sensitive means comprises at least two serially connected diodes connected by a linking conductor, said linking conductor being connected to the comparator output at the cathode of one diode and the anode of the other.
References Cited (Backward Citations)
US3921059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |