| 摘要 |
PURPOSE:To prevent drop of source voltage to an ignition control circuit when a constant voltage circuit is actuated, by connecting the output end of constant voltage circuit to the power supply circuit. CONSTITUTION:Cathode of a thyristor 1 constituting a constant voltage circuit, and one end of a resistance 3 to generate a gate trigger voltage for said cathode are connected to the anode of another thyristor 6 constituting a power supply circuit. When the charge voltage of an ignition capacitor 14 has attained a certain level, a zener diode 2 is actuated to turn on the thyristor 1. Through the thyristor 1, therefore, the output of the generator coil 1 is impressed on the power supply circuit without passing through a resistance 5. This eliminates drop of the voltage of power supply circuit.
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