US3702946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuits for regulating a current
Assignee: Siemens AG
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Filing: 1971-03-24
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Granted: 1972-11-14
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Expires: 1991-03-24
Abstract
Abstract The current flow through a series leg, composed of the collector-emitter path of a transistor, of a load resistor connected to the collector, and of a substantially non-inductive resistor connected to the emitter, is regulated by a reference voltage provided between the free terminal of the latter resistor and the base of the transistor. The voltage can vary linearly with the operating voltage applied to the said free end, in dependence on temperature, or in dependence on some other factor, or can be constant. A diode can be conductively connected between the base and the reference voltage. The resistance of the load resistor is less than that of the substantially non-inductive resistor.
Inventors
- 👤 Wolfgang Kraft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:14
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/14; G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06007; H03K17/51; H03K17/56; H03K17/60
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
183 words
A circuit for regulating the amplitude of control pulses, comprising in combination current path means for control pulses including a load, resistance means, a first transistor having a base and a collector-emitter path connected in series with said load and said resistance means, said first transistor having predetermined temperature-dependent base-emitter voltage characteristics, and terminal means for connection with a source of operating voltage; controlled switch means connected with said base of said first transistor and with a point of reference potential; a circuit junction; a second transistor comprising base and emitter electrodes defining a junction having temperature-dependent voltage characteristics at least approximating said predetermined characteristics, one of said electrodes being connected with the base of said first transistor, the other of said electrodes being connected with said circuit junction; and reference voltage means connected between said terminal means and said circuit junction. 2. A circuit as defined in claim 1, wherein said controlled switch means comprise an additional transistor having a collectoremitter path connected with said base of said first transistor and providing a path for the base current of said first transistor.
Claim 2
Dependent Claim
19 words
A circuit as defined in claim 1, wherein said first and second transistors are of the same conductivity type.
Claim 3
Dependent Claim
28 words
A circuit as defined in claim 1, wherein said one of said electrodes is said base electrode and wherein the other of said electrodes is said emitter electrode.
Claim 4
Dependent Claim
20 words
A circuit as defined in claim 1, wherein said second transistor comprises a collector electrode short-circuited to said base electrode.
Claim 5
Dependent Claim
24 words
A circuit as defined in claim 1; and further including a resistor connected between said terminal means and said base of said first transistor.
Claim 6
Dependent Claim
26 words
A circuit a defined in claim 1, wherein said load has a predetermined resistance and said resistance means has a resistance less than said predetermined resistance.
Claim 7
Dependent Claim
24 words
The circuit as defined in claim 1, said reference voltage means including temperature dependent resistance means connecting said terminal means to said circuit junction.
Claim 8
Dependent Claim
16 words
The circuit as defined in claim 8, wherein said temperature dependent resistance means is a diode.
Claim 9
Dependent Claim
20 words
A circuit as defined in claim 1; and further comprising a source of operating voltage connected with said terminal means.
Claim 10
Dependent Claim
19 words
The circuit as defined in claim 10, wherein said reference voltage means is linearly dependent on said operating voltage.
Claim 11
Dependent Claim
15 words
The circuit as defined in claim 10, wherein said reference voltage means is temperature dependent.
Claim 12
Dependent Claim
40 words
A circuit as defined in claim 1; and further said reference voltage means comprising fixed-potential means for providing a fixed potential, and wherein said controlled switch means is connected between said base of said first transistor and said fixed-potential means.
Claim 13
Dependent Claim
13 words
The circuit as defined in claim 13, wherein said fixed potential is ground.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |