| 摘要 |
An ignition apparatus for an internal combustion engine is disclosed in which a current control circuit for so limiting the collector current of a power transistor for controlling the primary current of an ignition coil that the collector current may not exceed a predetermined value, is provided. The current control circuit comprises a circuit for generating a preset reference voltage and a comparison circuit for comparing the reference voltage with a voltage proportional to the collector current of the power transistor, and controls the conductivity of the drive transistor for controlling the drive current for the power transistor in accordance with the output signal of the comparison circuit. The current control circuit is provided with a small resistance between ground and the junction point of the emitter of the drive transistor and the negative terminal of the reference voltage generating circuit, whereby a feedback circuit including the reference voltage generating circuit and the comparison circuit is provided for the emitter-collector path of the drive transistor.
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