Patent ID: 8503900

Claim:
A power supply unit, comprising: a first converter transformer; a first low voltage generation unit configured to generate a first voltage on a secondary side of the first converter transformer and output the first voltage; a first controller that controls an activation state of a primary side of the first converter transformer, on the primary side of the first converter transformer, based on the first voltage; an inactivation unit configured to inactivate operation of the first controller based on the first voltage to let the first low voltage generation unit to suspend output of the first voltage; a high voltage generation unit that is configured to generate a high voltage higher than the first voltage by using the first voltage and outputs the high voltage, comprising: a high voltage controller that controls the high voltage generation unit based on the high voltage; and an anomalous state detection unit configured to detect an anomalous state concerning output of the high voltage of the high voltage generation unit, wherein the high voltage controller inactivates the operation of the first controller through the inactivation unit when the anomalous state is detected by the anomalous state detection unit, wherein the power supply unit has an output OFF mode where output of the high voltage is cut off, and wherein the high voltage controller inactivates the operation of the first controller when the anomalous state detection unit detects that the high voltage is higher than or equal to a predetermined value in the output OFF mode.