| 摘要 |
To control conduction of a semiconductor element, typically a transistor, in the primary circuit of an ignition coil, by rapidly blocking the conduction to generate a high voltage potential, a current sensitive element, typically a resistor of less than about one ohm is located in the primary circuit to provide a control signal depending on the current flowing through the primary, the resistor being connected in parallel with the control circuit of a switching transistor having its emitter-collector path connected in parallel with the control circuit of the ignition transistor. Preferably, the ignition transistor is a composite Darlington-connected transistor pair.
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