| 摘要 |
<p>PROBLEM TO BE SOLVED: To downsize a step-up power supply device and an injector driving system including the same.SOLUTION: An inductor current control unit 36 controls an inductor current (IL) through switching control of a switching element 14 by using a detection result of an inductor current sensor 42. At this time, the inductor current control unit 36 has a first threshold set having a lower-limit current threshold and an upper-limit current threshold, and a second threshold set having a higher lower-limit current threshold and a higher upper-limit current threshold than those of the first threshold set that are set thereon. The inductor current control unit 36 performs switching control of the switching element 14 so that the inductor current (IL) falls between the lower-limit current threshold and the upper-limit current threshold of the first or second threshold set. Also, the first threshold set and second threshold set are switched so as to follow a load current generated in an injector 17.</p> |
