| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply device, with which voltage reduction in an early stage at the time of detection of an overvoltage can be realized at low cost.SOLUTION: An amplifier circuit 110 includes a choke coil 172, a switching element 174, a capacitor 176, and a filter circuit 178. When no overvoltage abnormality is detected, a gate control part 140 drives the switching element 174 based on a pulse signal from a pulse generator 130. On the other hand, when a detection voltage of a voltage detection part 150 exceeds a warning voltage and an overvoltage abnormality is detected, the gate control part 140 controls the switching element 174 so that a drain voltage of the switching element 174 becomes higher than a voltage of a power controller 10 and lower than the warning voltage. |
