| 主权项 |
1. A power supply device for an image forming device that is provided with a first load and a second load that operates at a higher voltage than the first load, and that operates by switching between operation modes, the power supply device comprising:
a transformer configured to generate, from an input voltage, a low output voltage for the first load and a high output voltage for the second load; an upper limiter circuit configured to receive the high output voltage from the transformer, and control the high output voltage not to exceed a maximum; a power controller configured to perform feedback control on the input voltage so that the low output voltage matches a target voltage; an operation mode acquirer configured to acquire an operation mode of the image forming device; and a target value controller configured to change the target voltage depending upon the acquired operation mode, the target voltage, when the acquired operation mode is a high current consumption mode, ensuring that the high output voltage does not fall below a minimum of a rated voltage range of the high output voltage, the target voltage, when the acquired operation mode is a low current consumption mode, being lower than the target voltage when the acquired operation mode is the high current consumption mode, the image forming device consuming a greater amount of current with the high output voltage in the high current consumption mode than in the low current consumption mode. |
