Power supply device

An electric power supply device for supplying electric power from a supply side device to a receiver side device including a mechanism section that operates intermittently with a drive voltage and a receiver side control section that controls an operation of the mechanism section with a control voltage that is lower than the drive voltage, the electric power supply device comprising:

• a regulator section, which is provided on the receiver side device, that converts a received voltage received via an electric power supply into the control voltage;
• a supply voltage adjusting section, which is provided on the supply side device, that adjustably supplies the received voltage;
• and
• a supply side control section, which is provided on the supply side device, that controls the received voltage by controlling the supply voltage adjusting section, a wherein
• the supply side control section determines a mechanism operating time period for operation of the mechanism section, commands the operation of the mechanism section during the mechanism operating time period by approximately matching the received voltage to the drive voltage, and lowers the received voltage below the drive voltage for a control operation time period, which is a time period except for the mechanism operating time period.