US3361955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current limiting for power supply switching transistors
Assignee: Telefunken Patentverwertungs GmbH
•
Filing: 1965-09-07
•
Granted: 1968-01-02
•
Expires: 1985-09-07
Abstract
No abstract record available.
Inventors
- 👤 Typke Jurgen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:59
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/1563
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
378 words
IN A REGULATED POWER SUPPLY, WHEREIN THE PRIMARY WINDING OF A TRANSFORMER, THE COLLECTOR-EMITTER SWITCHING PATH OF A FIST SWITCHING TRANSISTOR, AND A CAPACITOR ARE CONNECTED IN SERIES ACROSS THE INPUT TERMINALS OF SAID REGULATED POWER SUPPLY, THE PRIMARY WINDINGS BEING CONNECTED TO ONE OF THE INPUT TERMINALS, THE OUTPUT APPEARING ACROSS THE CAPACITOR, THE BASE OF THE FIRST SWITCHING TRANSISTOR BEING CONNECTED THROUGH A FIRST RESISTOR TO THE ONE INPUT TEMINAL AND ALSO TO A CONTROL DEVICE CONNECTED ACROSS THE CAPACITOR, WHICH OPERATES PERIODICALLY DEPENDING ON THE OUTPUT VOLTAGE AT THE CAPACITOR, AND WHEREIN A RECTIFIER HAVING FIRST AND SECOND ELECTRODES HAS THE FIRST ELECTRODE CONNECTED TO ONE TERMINAL OF THE SECONDARY WINDING OF THE TRANSFORMER, THE OTHER TERMINAL OF THE SECONDARY WINDING BEING CONNECTED TO THE OTHER INPUT TERMINAL, THE IMPROVEMENT COMPRISING A CURRENT LIMITING CIRCUIT INCLUDING: (1) MEANS FORMING (A) A RESISTANCE PATH INCORPORATED IN THE SERIES CIRCUIT AND INTERPOSED BETWEEN THE CAPACITOR AND THE EMITTER OF THE FIRST TRANSISTOR, AND (B) A RESISTANCE PATH CONNECTED BETWEEN THE EMITTER OF THE FIRST TRANSISTOR AND THE SECOND ELECTRODE OF THE RECTIFIER; (2) A SECOND TRANSISTOR; (3) A SECOND TRANSISTOR HAVING ONE TERMINAL CONNECTED TO THE BASE OF SAID SECOND TRANSISTOR AND THE OTHER TERMINAL CONNECTED TO THE SECOND ELECTRODE TO THE RECTIFIER; (4) A THIRD RESISTOR HAVING ONE TERMINAL CONNECTED TO THE BASE OF SAID SECOND TRANSISTOR AND THE OTHER TERMINAL TO THE FIRST ELECTRODE OF THE RECTIFIER; (5) A FOURTH RESISTOR HAVING ONE TERMINAL CONNECTED TO THE BASE OF SAID SECOND TRANSISTOR AND THE OTHER TERMINAL CONNECTED TO THE JUNCTION BETWEEN THE CAPACITOR AND SAID RESISTANCE PATH (A) AND ALSO TO THE EMITTER OF SAID SECOND TRANSISTOR; AND (6) A DIODE HAVING ONE ELECTRODE CONNECTED TO THE COLLECTOR OF SAID SECOND TRANSISTOR AND THE OTHER ELECTRODE CONNECTED TO THE BASE OF THE FIRST TRANSISTOR AND ALSO TO ONE TERMINAL OF THE FIRST RESISTOR; (7) THE RELATIONSHIP BETWEEN THE NUMBER OF TURNS N1 IN THE PRIMARY WINDING, THE NUMBER OF TURNS N2 IN THE SECONDARY WINDING, THE RESISTANCE R1 OF THE RESISTANCE PATH (A) CONNECTED BETWEEN THE EMITTER OF THE FIRST TRANSISTOR AND THE CAPACITOR, AND THE RESISTANCE R2 OF THE RESISTANCE PATH (B) CONNECTED BETWEEN THE EMITTER OF THE FIRST TRANSISTOR AND THE RECTIFIER, BEING
Claim 2
Dependent Claim
378 words
IN A REGULATED POWER SUPPLY, WHEREIN THE PRIMARY WINDING OF A TRANSFORMER, THE COLLECTOR-EMITTER SWITCHING PATH OF A FIST SWITCHING TRANSISTOR, AND A CAPACITOR ARE CONNECTED IN SERIES ACROSS THE INPUT TERMINALS OF SAID REGULATED POWER SUPPLY, THE PRIMARY WINDINGS BEING CONNECTED TO ONE OF THE INPUT TERMINALS, THE OUTPUT APPEARING ACROSS THE CAPACITOR, THE BASE OF THE FIRST SWITCHING TRANSISTOR BEING CONNECTED THROUGH A FIRST RESISTOR TO THE ONE INPUT TEMINAL AND ALSO TO A CONTROL DEVICE CONNECTED ACROSS THE CAPACITOR, WHICH OPERATES PERIODICALLY DEPENDING ON THE OUTPUT VOLTAGE AT THE CAPACITOR, AND WHEREIN A RECTIFIER HAVING FIRST AND SECOND ELECTRODES HAS THE FIRST ELECTRODE CONNECTED TO ONE TERMINAL OF THE SECONDARY WINDING OF THE TRANSFORMER, THE OTHER TERMINAL OF THE SECONDARY WINDING BEING CONNECTED TO THE OTHER INPUT TERMINAL, THE IMPROVEMENT COMPRISING A CURRENT LIMITING CIRCUIT INCLUDING: (1) MEANS FORMING (A) A RESISTANCE PATH INCORPORATED IN THE SERIES CIRCUIT AND INTERPOSED BETWEEN THE CAPACITOR AND THE EMITTER OF THE FIRST TRANSISTOR, AND (B) A RESISTANCE PATH CONNECTED BETWEEN THE EMITTER OF THE FIRST TRANSISTOR AND THE SECOND ELECTRODE OF THE RECTIFIER; (2) A SECOND TRANSISTOR; (3) A SECOND TRANSISTOR HAVING ONE TERMINAL CONNECTED TO THE BASE OF SAID SECOND TRANSISTOR AND THE OTHER TERMINAL CONNECTED TO THE SECOND ELECTRODE TO THE RECTIFIER; (4) A THIRD RESISTOR HAVING ONE TERMINAL CONNECTED TO THE BASE OF SAID SECOND TRANSISTOR AND THE OTHER TERMINAL TO THE FIRST ELECTRODE OF THE RECTIFIER; (5) A FOURTH RESISTOR HAVING ONE TERMINAL CONNECTED TO THE BASE OF SAID SECOND TRANSISTOR AND THE OTHER TERMINAL CONNECTED TO THE JUNCTION BETWEEN THE CAPACITOR AND SAID RESISTANCE PATH (A) AND ALSO TO THE EMITTER OF SAID SECOND TRANSISTOR; AND (6) A DIODE HAVING ONE ELECTRODE CONNECTED TO THE COLLECTOR OF SAID SECOND TRANSISTOR AND THE OTHER ELECTRODE CONNECTED TO THE BASE OF THE FIRST TRANSISTOR AND ALSO TO ONE TERMINAL OF THE FIRST RESISTOR; (7) THE RELATIONSHIP BETWEEN THE NUMBER OF TURNS N1 IN THE PRIMARY WINDING, THE NUMBER OF TURNS N2 IN THE SECONDARY WINDING, THE RESISTANCE R1 OF THE RESISTANCE PATH (A) CONNECTED BETWEEN THE EMITTER OF THE FIRST TRANSISTOR AND THE CAPACITOR, AND THE RESISTANCE R2 OF THE RESISTANCE PATH (B) CONNECTED BETWEEN THE EMITTER OF THE FIRST TRANSISTOR AND THE RECTIFIER, BEING
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) | 1971-01-01 | 1971-07-03 | 1972-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-01 | 1975-07-03 | 1976-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-01 | 1979-07-03 | 1980-01-02 | $7700.00 | Window Closed / Lapsed |