US3766410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilizing circuit for standing currents
Assignee: Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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Filing: 1971-08-16
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Granted: 1973-10-16
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Expires: 1991-08-16
Abstract
Abstract The standing current in series connected complementary transistors of a push-pull power stage is stabilized against fluctuations in temperature, supply voltage and/or changes in component use, by placing a current resistive element in series with the transistors in the path of the standing current. Voltage variations are developed across the resistive element in response to changes in the standing current caused by one more of the fluctuations. An electrode of an auxiliary transistor is connected between one of the complementary transistors and the resistive element to detect the voltage variations and modify the quiescent bias conditions in one of the series connected complementary transistors to counteract the effect of the changes.
Inventors
- 👤 D Elsaesser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:32
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/307; H03F3/00; H03F3/30; H03F3/3069; H03F3/3071
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
A stabilized push-pull circuit comprising first and second complementary push-pull transistors arranged to conduct standing current in a predetermined current path, said transistors respectively having first and second control electrodes arranged to receive control signals for modifying said current; regulating means having a third control electrode and connected to each of said first and second electrodes; and monitoring means arranged in said current path and connected to said third control electrode for monitoring changes in said current and for controlling said regulating means, said regulating means being operative for restoring said current when changes in the latter are detected by applying to said first and second electrodes control signals dependent on the monitored changes in said current.
Claim 2
Dependent Claim
117 words
A stabilized push-pull circuit comprising first and second complementary push-pull transistors arranged to conduct standing current in a predetermined current path, said transistors respectively having first and second control electrodes arranged to receive control signals for modifying said current; regulating means having a third control electrode and connected to each of said first and second electrodes; and monitoring means arranged in said current path and connected to said third control electrode for monitoring changes in said current and for controlling said regulating means, said regulating means being operative for restoring said current when changes in the latter are detected by applying to said first and second electrodes control signals dependent on the monitored changes in said current.
Claim 3
Dependent Claim
89 words
A circuit as defined in claim 1, wherein said regulating means comprises a regulating transistor, said first, second and third control electrodes respectively comprising the bases of said first, second and regulating transistors, the collector and emitter electrodes of said regulating transistor being respectively connected to said first and second bases, and wherein said monitoring means has first and second terminals respectively connected to the emitters of said first and second transistors to define two junction points, and said third base being connected to one of said junction points.
Claim 4
Dependent Claim
60 words
A circuit as defined in claim 2, wherein said monitoring means comprises a diode having its anode connected to the emitter of said first transistor and its cathode connected to the emitter of said second transistor, and wherein said third base is connected to the junction formed by the connection of said anode and the emitter of said first transistor.
Claim 5
Dependent Claim
37 words
A circuit as defined in claim 3, further comprising a load resistance; and capacitor means connected between said load resistance and the junction formed by the connection of said cathode and the emitter of said second transistor.
Claim 6
Dependent Claim
30 words
A circuit as defined in claim 3, wherein said first and second transistors are of the germanium type, and said regulating transistor and said diode are of the silicon type.
Claim 7
Dependent Claim
19 words
A circuit as defined in claim 3, wherein all said transistors and said diode are of the germanium type.
Claim 8
Dependent Claim
14 words
A circuit as defined in claim 1, wherein said monitoring means comprises a resistor.
Claim 9
Dependent Claim
156 words
A stabilized push-pull circuit comprising first and second push-pull transistors having respective first and second collector-emitter paths together forming part of a current path for standing current, said transistors having respective first and second control electrodes arranged to receive control signals for modifying said current; regulating means having a third control electrode and connected to each of said first and second electrodes; and monitoring means comprising a diode defining a further part of said current path and connected to carry said standing current from the collector-emitter path of said first transistor to the collector-emitter path of said first transistor to the collector-emitter path of said second transistor and operative for monitoring changes in said current and for controlling said regulating means, said regulating means being operative for restoring said current when changes in the latter are detected by applying to said first and second control electrodes control signals dependent on the monitored changes in said current.
Claim 10
Dependent Claim
156 words
A stabilized push-pull circuit comprising first and second push-pull transistors having respective first and second collector-emitter paths together forming part of a current path for standing current, said transistors having respective first and second control electrodes arranged to receive control signals for modifying said current; regulating means having a third control electrode and connected to each of said first and second electrodes; and monitoring means comprising a diode defining a further part of said current path and connected to carry said standing current from the collector-emitter path of said first transistor to the collector-emitter path of said first transistor to the collector-emitter path of said second transistor and operative for monitoring changes in said current and for controlling said regulating means, said regulating means being operative for restoring said current when changes in the latter are detected by applying to said first and second control electrodes control signals dependent on the monitored changes in said current.
Claim 11
Dependent Claim
46 words
A circuit as defined in claim 8, further comprising a source of electrical energy having positive and negative poles, and wherein said positive pole is connected to the collector of said first transistor and said negative pole is connected to the collector of said second transistor.
Claim 12
Dependent Claim
25 words
A circuit as defined in claim 9, further comprising resistor means connected between each of said first and second control electrodes and said negative pole.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |