发明名称 |
Power supply unit, image forming apparatus and power supply control method |
摘要 |
A power supply unit includes a switching circuit that drives a switching device by a duty ratio corresponding to a target voltage output value and outputs an alternating current signal; a coupling capacitance element provided in a subsequent stage with respect to the switching circuit; a voltage transformation unit that increases a voltage of the alternating current signal input by using the switching circuit, and outputs a high-voltage alternating current voltage to an electrifying unit; a charging unit that charges the coupling capacitance element in response to a power supply voltage being turned on; and a control unit that controls driving of the switching device to cause the coupling capacitance element to be charged to a predetermined charged amount before the switching circuit starts outputting the alternating current signal.
|
申请公布号 |
US8494395(B2) |
申请公布日期 |
2013.07.23 |
申请号 |
US20100953929 |
申请日期 |
2010.11.24 |
申请人 |
YAMAMOTO NAOHIRO;RICOH COMPANY, LTD. |
发明人 |
YAMAMOTO NAOHIRO |
分类号 |
G03G15/00 |
主分类号 |
G03G15/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|