| 摘要 |
<P>PROBLEM TO BE SOLVED: To make both compatible in achieving high pressure of secondary voltage, shortening an ignition response time and reducing cutoff noise. <P>SOLUTION: This ignition control device includes a main IGBT 31 (a switching element for ignition) for controlling current-carrying and cutoff to a primary coil 11, and a sub-IGBT 32 (a switching element for feedback) connected between a collector Cm and a gate Gm of the main IGBT 31 and controlling whether or not to feed back by impressing voltage of the collector Cm on the gate Gm. A parasitic capacitor Cpara existing between the collector Cs (a feedback input terminal) and the gate Gs (a feedback electric continuity control terminal) of the sub-IGBT 32, is charged with cutoff noise voltage generated in the collector Cm in response to OFF operation of the main IGBT 31, the sub-IGBT 32 performs ON operation by increasing control voltage of the gate Gs by this charge, and the sub-IGBT 32 also performs OFF operation by reducing the control voltage by discharging the parasitic capacitor Cpara. <P>COPYRIGHT: (C)2013,JPO&INPIT |
