US3833848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
D.c.-fed regulated direct-current supply
Assignee: Danfoss AS
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Filing: 1972-01-27
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Granted: 1974-09-03
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Expires: 1992-01-27
Abstract
Abstract The invention relates to a D.C.-fed regulated direct current voltage supply for feeding an inverted converter connected to a three phase motor. The voltage supply has current sensing means to which is connected voltage regulating means. The voltage regulating means is responsive to a maximum predetermined current value to reduce the voltage to prevent the current from exceeding the predetermined value. The voltage regulating means includes an SCR or equivalent which is opened and closed by impulses. The open and/or closed periods are of varying duration to prevent the current from exceeding the predetermined value.
Inventors
- 👤 T Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:26
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/125; H02M3/135; H02M3/137
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
162 words
A D.C.-fed regulated direct current voltage regulator for supplying a variable load, comprising an SCR forming a regulating element, control means incLuding a pulse generator for developing a pulse signal, voltage sensing means to sense the voltage supplied to said load, current sensing means to sense the current supplied to said load, said voltage sensing means controlling said pulse generator to develop a pulse control signal which is supplied to said SCR to provide the required voltage regulation under normal conditions by alternately striking and blocking said SCR to provide conduction periods and off periods, said conducting periods being of varying duration to increase or decrease the voltage, and said current sensing means controlling said pulse generator such that under overload conditions said current supplied to said load does not exceed a predetermined maximum value by alternately striking and blocking said SCR to provide conduction periods and off periods, said off periods being of varying duration to increase or decrease the voltage.
Claim 2
Dependent Claim
162 words
A D.C.-fed regulated direct current voltage regulator for supplying a variable load, comprising an SCR forming a regulating element, control means incLuding a pulse generator for developing a pulse signal, voltage sensing means to sense the voltage supplied to said load, current sensing means to sense the current supplied to said load, said voltage sensing means controlling said pulse generator to develop a pulse control signal which is supplied to said SCR to provide the required voltage regulation under normal conditions by alternately striking and blocking said SCR to provide conduction periods and off periods, said conducting periods being of varying duration to increase or decrease the voltage, and said current sensing means controlling said pulse generator such that under overload conditions said current supplied to said load does not exceed a predetermined maximum value by alternately striking and blocking said SCR to provide conduction periods and off periods, said off periods being of varying duration to increase or decrease the voltage.
Claim 3
Dependent Claim
66 words
A D.C.-fed regulated direct current voltage supply according to claim 1 wherein said voltage regulating means includes a controlled intermittent current conducting element, said voltage regulating means including impulse means for alternately striking and blocking said element to provide conduction periods and off periods, said conducting periods being of varying duration to increase or decrease the voltage to prevent said predetermined current value from being exceeded.
Claim 4
Dependent Claim
66 words
A D.C.-fed regulated direct current voltage supply accroding to claim 1 wherein said voltage regulating means includes a controlled intermittent current conducting element, said voltage regulating means including impulse means for alternately striking and blocking said element to provide conduction periods and off periods, said off periods being of varying duration to increase or decrease the voltage to prevent said predetermined current value from being exceeded.
Claim 5
Dependent Claim
28 words
A D.C.-fed regulated direct current voltage supply according to claim 1 wherein said variable load is a three phase motor, said motor being reversible by interchanging two phase.
Claim 6
Dependent Claim
28 words
A D.C.-fed regulated direct current voltage supply accroding to claim 4 wherein said converter includes controlled rectifiers, said rectifiers being reversible to interchange the phases of said motor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |