Internal-combustion engines – High tension ignition system – Power supply – ignition coil primary – and interrupter element...
Patent
1984-02-24
1985-02-26
Nelli, Raymond A.
Internal-combustion engines
High tension ignition system
Power supply, ignition coil primary, and interrupter element...
123656, F02P 304, F02P 900, F02P 100, F02P 1100
Patent
active
045012563
ABSTRACT:
A magnet rotating synchronously with an internal combustion engine magnetically couples periodically with a stator having primary and secondary windings to induce a voltage in the primary winding. A switching transistor is connected across the primary winding terminals. A voltage divider circuit is connected between one primary winding terminal and the transistor base for supplying base-emitter current when the primary voltage reaches a predetermined level, thereby turning the transistor switch on. The anode and gate of a programmable unijunction transistor (PUT) are connected to points in the divider to sense increasing base current and a corresponding increasing PUT anode-to-gate voltage. At a specific anode-gate voltage, the PUT conducts to short circuit the transistor switch base current, and turn the switch off. This causes the magnetic field in the stator to collapse and induce a high voltage in the secondary winding to fire the engine spark plug.
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