Patent US739146A successfully refreshed from Google Patents.
Patent US3884208A successfully refreshed from Google Patents.
US3884208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistorized ignition system for internal combustion engines
Assignee: BBC Brown Boveri AG Germany
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Filing: 1974-06-03
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Granted: 1975-05-20
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Expires: 1994-06-03
Abstract
Abstract An ignition system for internal combustion engines is provided with means for (1) reducing to virtually zero variations of the primary energizing current of the ignition coil, or obtaining the highest charging current though the terminal voltage of the d-c current supply undergoes variations; (2) interrupting the flow of the ignition coil energizing current automatically upon a predetermined time following cessation of the operation of the internal combustion engine, and (3) preventing connection of transistors to terminals having the wrong polarity, and thus causing destruction of improperly connected diodes or transistors.
Inventors
- 👤 Richard Beuter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:58
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/02; F02P3/04; F02P3/055; F02P3/0552; F02P15/00; F02P15/12; F02P3/05; F02P3/051
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
404 words
An ignition system energized by a d-c power source fOr internal combustion engines including a. an ignition coil (9) having a primary winding (9a) and a secondary winding (9b); b. an interrupter (1) for interrupting the current flow in said ignition coil (9); c. a main transistor (7) controlling the current flow in said primary winding (9a) of said ignition coil (9), said primary winding (9a) of said ignition coil (9) being arranged in series with the collector-emitter circuit (7a, 7c) of said main transistor (7) and in series with a negative feed-back resistor (8) connected to the negative terminal of a d-c power supply; d. a first auxiliary control transistor (4) having a collector (4c) connected to the base (4b) of said main control transistor and an emitter (4a) connected to a d-c power supply; e. a pre-transistor (30), a second auxiliary control transistor (35) and a regulating transistor (48), the collector (48c) of said regulating transistor (48) being connected to the base (35b) of said second auxiliary control transistor (35), the collector (35c) of said second auxiliary control transistor (35) being connected to collector (30c) of said pre-transistor, the emitter (35a) of said second auxiliary control transistor (35) being connected by the intermediary of a resistor (37) to one contact of said interrupter (1) and to the emitter (48a) of said regulating transistor (48), the emitter (35a) of said secondary auxiliary control transistor (35) being further connected by the intermediary of a diode (36) to the emitter (7a) of said main transistor (7) and to said negative feed-back resistor (8), the cathode of said diode being arranged adjacent the emitter (35a) of said second auxiliary control transistor (35) and the anode of said diode (36) being arranged adjacent the emitter (7a) of said main transistor (7), said collector (48c) of said regulating transistor being further connected to the base (48b) thereof by the intermediary of a resistor (46) and a Zener diode (47), said base (35b) of said second auxiliary control transistor (35) being connected to the positive terminal of a d-C power supply by the intermediary of resistor means (46, 19) and f. a network including a resistor (43), a temperature sensitive resistor (38), a damping capacitor (45) and additional resistor means (37) interconnecting said base (35b) of said second auxiliary control transistor (35) with the emitter (48a) of said regulating transistor (48) and with one contact of said interrupter (1).
Claim 2
Dependent Claim
404 words
An ignition system energized by a d-c power source fOr internal combustion engines including a. an ignition coil (9) having a primary winding (9a) and a secondary winding (9b); b. an interrupter (1) for interrupting the current flow in said ignition coil (9); c. a main transistor (7) controlling the current flow in said primary winding (9a) of said ignition coil (9), said primary winding (9a) of said ignition coil (9) being arranged in series with the collector-emitter circuit (7a, 7c) of said main transistor (7) and in series with a negative feed-back resistor (8) connected to the negative terminal of a d-c power supply; d. a first auxiliary control transistor (4) having a collector (4c) connected to the base (4b) of said main control transistor and an emitter (4a) connected to a d-c power supply; e. a pre-transistor (30), a second auxiliary control transistor (35) and a regulating transistor (48), the collector (48c) of said regulating transistor (48) being connected to the base (35b) of said second auxiliary control transistor (35), the collector (35c) of said second auxiliary control transistor (35) being connected to collector (30c) of said pre-transistor, the emitter (35a) of said second auxiliary control transistor (35) being connected by the intermediary of a resistor (37) to one contact of said interrupter (1) and to the emitter (48a) of said regulating transistor (48), the emitter (35a) of said secondary auxiliary control transistor (35) being further connected by the intermediary of a diode (36) to the emitter (7a) of said main transistor (7) and to said negative feed-back resistor (8), the cathode of said diode being arranged adjacent the emitter (35a) of said second auxiliary control transistor (35) and the anode of said diode (36) being arranged adjacent the emitter (7a) of said main transistor (7), said collector (48c) of said regulating transistor being further connected to the base (48b) thereof by the intermediary of a resistor (46) and a Zener diode (47), said base (35b) of said second auxiliary control transistor (35) being connected to the positive terminal of a d-C power supply by the intermediary of resistor means (46, 19) and f. a network including a resistor (43), a temperature sensitive resistor (38), a damping capacitor (45) and additional resistor means (37) interconnecting said base (35b) of said second auxiliary control transistor (35) with the emitter (48a) of said regulating transistor (48) and with one contact of said interrupter (1).
Claim 3
Dependent Claim
45 words
A system as specified in claim 1 wherein said resistor (43) and said temperature sensitive resistor (38) are arranged in series in said network and have such parameters that the sum of the ohmic resistance thereof remains substantially constant over a wide range of temperatures.
Claim 4
Dependent Claim
100 words
A system as specified in claim 1 having means for automatically de-energizing said primary winding (9a) of said ignition coil (9) upon interruption of operation of an internal combustion engine, said de-energizing means including a series arrangement of resistors (19, 31) and of a capacitor (33) arranged in the current path from the positive terminal of a d-c power supply (2) to the base (30b) of said transistor (30) to turn off said pre-transistor when said capacitor is fully charged, and a diode (32) allowing said capacitor (30b) to be discharged upon opening of the contacts of said interrupter (1).
Claim 5
Dependent Claim
75 words
A system as specified in claim 3 wherein a diode (29) is arranged between said positive terminal of said power supply (2) and said series arrangement of resistors (19, 31) and of a capacitor (33), said emitter (4a) of said first auxiliary transistor (4) and one end of said primary winding (9a) of said ignition coil (9) to preclude damage to said system when applying voltages of inverse polarity to the terminals (17, 18) thereof.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |