Voltage supplying device, developer recovery device, and image forming apparatus

A voltage supplying device, comprising:

• a first voltage generation circuit which generates a first output voltage having a first polarity, that is of a level corresponding to a first adjustment signal that is input, and outputs the first output voltage to a first output line using a grounded first reference line as a reference;
• a first control circuit which executes first feedback control for outputting, to the first voltage generation circuit, the first adjustment signal corresponding to a comparison result between a level of a first target signal that is input and a level of a first feedback signal expressing the level of the first output voltage;
• a second voltage generation circuit which generates a second output voltage having a second polarity, that is of a level corresponding to a second adjustment signal that is input, and outputs the second output voltage to a second output line using a second reference line that is electrically connected to the first output line as a reference;
• and
• a second control circuit which executes second feedback control for outputting, to the second voltage generation circuit, the second adjustment signal corresponding to a comparison result between a level of a second target signal that is input and a level of a second feedback signal expressing a level of a third output voltage that is generated between a grounding line and the second output line, to selectively execute processing of causing the second voltage generation circuit to generate the second output voltage having an absolute value larger than an absolute value of the first output voltage and processing of causing the second voltage generation circuit to stop outputting the second output voltage, wherein
• the first control circuit executes the first feedback control at a response speed lower than that of the second feedback control, and
• the voltage supplying device supplies the third output voltage to a voltage supplying target.