US4567426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current stabilizer with starting circuit
Assignee: US Philips Corp
•
Filing: 1984-03-30
•
Granted: 1986-01-28
•
Expires: 2004-03-30
Abstract
Abstract Two current circuits are between two common terminals (+V B and -V B ). The ratio between the currents in the two current circuits is defined by a first current-dividing circuit, and the absolute values of these currents are defined by means of a second current-dividing circuit, in particular a resistor in this second current-dividing circuit. In order to ensure that the current-stabilizing assumes the proper state upon activation, a first current-supply circuit is coupled to the input of the second current-dividing circuit, which current-supply circuit comprises the series arrangement of a resistor and a transistor arranged as a diode, and a second current-supply circuit is coupled to the output of the current-dividing circuit, which second current-supply circuit includes a transistor whose base is connected in common with that of the transistor of the first current-supply circuit.
Inventors
- 👤 Rudy J. VAN DE Plassche
- 👤 Peter J. M. Sijbers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:36
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/26; G05F3/265; Y; Y10; Y10S; Y10S323/00; Y10S323/901
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
222 words
A current stabilizing arrangement comprising a first and a second current path between a first and a second common terminal, a first current-dividing circuit comprising transistors of a first conductivity type and having an input circuit with a low input impedance and an output circuit with a high output impedance, and a second current-dividing circuit comprising transistors of a second conductivity type and also having an input circuit with a low input impedance and an output circuit with a high output impedance, the first current-dividing circuit defining the ratio between currents flowing in the two current paths and the second current-dividing circuit defining the absolute values of the currents flowing in the two current paths and having a semiconductor junction connected in parallel with a series arrangement of a semiconductor junction and a first resistor, which current-stabilizing arrangement also comprises means for starting the current-stabilizing arrangement, characterized in that the means comprises a first current-supply circuit which supplies a current to the input circuit of the second current-dividing circuit and a second current-supply circuit which supplies a current to the output circuit of the second current-dividing circuit, the currents supplied by the first and the second current-supply circuit having a ratio which is equal to the ratio between the currents in the two current paths as defined by the first current-dividing circuit.
Claim 2
Dependent Claim
222 words
A current stabilizing arrangement comprising a first and a second current path between a first and a second common terminal, a first current-dividing circuit comprising transistors of a first conductivity type and having an input circuit with a low input impedance and an output circuit with a high output impedance, and a second current-dividing circuit comprising transistors of a second conductivity type and also having an input circuit with a low input impedance and an output circuit with a high output impedance, the first current-dividing circuit defining the ratio between currents flowing in the two current paths and the second current-dividing circuit defining the absolute values of the currents flowing in the two current paths and having a semiconductor junction connected in parallel with a series arrangement of a semiconductor junction and a first resistor, which current-stabilizing arrangement also comprises means for starting the current-stabilizing arrangement, characterized in that the means comprises a first current-supply circuit which supplies a current to the input circuit of the second current-dividing circuit and a second current-supply circuit which supplies a current to the output circuit of the second current-dividing circuit, the currents supplied by the first and the second current-supply circuit having a ratio which is equal to the ratio between the currents in the two current paths as defined by the first current-dividing circuit.
Claim 3
Dependent Claim
66 words
A current-stabilizing arrangement as claimed in claim 1, characterized in that the first current-supply circuit comprises a series arrangement of a transistor connected as a diode and a resistor, the resistor being coupled to the input circuit of the second current-dividing circuit, and the second current supply circuit comprises a transistor whose base is coupled to the base of the transistor of the first current-supply circuit.
Claim 4
Dependent Claim
32 words
A current-stabilizing arrangement as claimed in claim 1, characterized in that the first and the second current-supply circuit each comprise a transistor, which transistors have commoned bases which carry a reference voltage.
Claim 5
Dependent Claim
29 words
A current-stabilizing arrangement as claimed in claim 3, characterized in that the transistors of the first and the second current-supply circuit comprise a single transistor having a double collector.
References Cited (Backward Citations)
DE2140692A1
Cited
DE2157756A1
Cited
US4185236A
Cited
DE3027761A1
Cited
US4282477A
Cited
US4399399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |