| 摘要 |
PROBLEM TO BE SOLVED: To provide an ignition device for a capacitor discharge type internal combustion engine of a direct current voltage boosting type for igniting even when an output voltage of a direct current power supply part is low. SOLUTION: When a detection signal Vil of a primary electric current of a booster transformer 2 reaches to a cutoff value set signal Vis obtained from a resistance voltage dividing circuit 4b, a switch 3 for chopper is turned off to cut off the primary electric current of the booster transformer. A resistor R30 for adjusting a cutoff value is connected between an output port B3 of a microcomputer 10A and a voltage dividing point of the resistance voltage dividing circuit 4b. When a power supply voltage E0 reaches to a reference value, a voltage equal to the power supply voltage E0 is outputted from the output port B3 and the cutoff value set signal Vis is switched to a high value. When the power supply voltage E0 does not reach to the reference value, an output of a voltage from the output port B3 stops and the cutoff value set signal Vis is switched to a low value.
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