| 摘要 |
<P>PROBLEM TO BE SOLVED: To securely reduce radio noise while minimizing the number of necessary common mode filters. <P>SOLUTION: In an injector driver circuit, first and second drive transistors 1, 2 are connected between a buffer capacitor 5 and a ground, and a coil 4 for current limitation and a first winding 7 of a common mode choke coil 6 are connected in series between a junction point of the first and second drive transistors 1, 2 and a junction point of one ends of respective piezoelectric injectors 21-1 to 21-4. A second winding 8 of the common mode choke coil 6 and a resistor 10 for current detection are connected in series between sources of transistors 11 to 14 for selection connected to the other ends of the respective piezoelectric injectors 21-1 to 21-4 corresponding to drain and the ground. <P>COPYRIGHT: (C)2009,JPO&INPIT |
