| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a driving device that can turn on a semiconductor switching element for the same duration as an intended duty cycle even if a slope of a PWM signal is controlled. <P>SOLUTION: When a gate drive circuit 4 outputs a gate signal with a slope added to rising and falling edges of an input PWM signal, respectively, to a gate of an N-channel MOSFET 1, a duty cycle adjustment unit 3 detects a voltage signal supplied to a lamp 2 via the N-channel MOSFET 1, determines time (a) between the rising edge of the input signal and the rising edge of a voltage signal and time (b) between the falling edge of the PWM signal and the falling edge of the voltage signal, and outputs a driving signal with its duty cycle (z) set as z=(x+a-b) to the gate drive circuit 4. <P>COPYRIGHT: (C)2012,JPO&INPIT |
