Patent ID: 8836312

Claim:
An apparatus comprising a power supply for protection of insulation, the power supply comprising: a conversion unit to convert input power into output power having a predetermined voltage; an emitting unit to output an emittance upon the voltage of the output power exceeding a threshold voltage; a receiving unit to receive the emittance output from the emitting unit and output a signal indicative of the voltage of the output power; a controller to control an operation of the conversion unit based on the output signal from the receiving unit; and a disconnection unit to disconnect power applied to the receiving unit if a voltage of the power applied to the receiving unit exceeds a trigger voltage, wherein the disconnection unit comprises a switch turned on based on the voltage of power applied to a terminal of the controller detected by a detector and making one end of a fusible element be grounded so that the fusible element is opened to protect insulation in the apparatus.