Patent ID: 8861176
Filing Date: 2014-10-14
Classification: F02P

Abstract:
1. An ignition coil device to be connected to a spark plug and for generating a voltage that causes spark discharge at the spark plug by boosting a voltage applied from an external power source, the ignition coil device comprising: a primary coil to be connected to the power source; a switching member switching an on state and an off state of electric power supply from the power source to the primary coil; a secondary coil generating the voltage that causes the spark discharge as the electric power supply from the power source to the primary coil is switched from the on state to the off state by the switching member; and a parallel circuit including a series coil and a resistor, the series coil being connected in series with a conducting section that electrically connects the secondary coil to the spark plug, the resistor having a fixed electric resistance value and being connected to the conducting section in parallel with the series coil, wherein the series coil includes an internal resistive component, a parasitic component, and an inductance component, which are connected in parallel with one another, and the fixed electric resistance value of the resistor is smaller than a resistance value of the internal resistive component.