发明授权
- 专利标题: Power supply apparatus and heating apparatus and image forming apparatus
- 专利标题(中): 电源装置及加热装置及成像装置
-
申请号: US11255102申请日: 2005-10-21
-
公开(公告)号: US07310486B2公开(公告)日: 2007-12-18
- 发明人: Takao Kawazu , Atsuya Takahashi , Masataka Mochizuki , Hiroshi Chihara
- 申请人: Takao Kawazu , Atsuya Takahashi , Masataka Mochizuki , Hiroshi Chihara
- 申请人地址: JP Tokyo
- 专利权人: Canon Kabushiki Kaisha
- 当前专利权人: Canon Kabushiki Kaisha
- 当前专利权人地址: JP Tokyo
- 代理机构: Fitzpatrick, Cella, Harper & Scinto
- 优先权: JP2004-317062 20041029
- 主分类号: G03G15/00
- IPC分类号: G03G15/00 ; G03G15/20
摘要:
A period of a first edge, a voltage change in a first direction of a first pulse signal fed from a zero-crossing detecting circuit, is detected. A second edge, a voltage change in a second direction opposite to the first direction, is generated when a time period equal to half the period of the first edge has elapsed from the next first edge. In response to a second pulse signal generated from the first and second edges, phase control of power to be supplied to heating elements is performed by using triacs. In this manner, during power control using a signal from the zero-crossing detecting circuit as a trigger signal, is achieved stable power control which enables tracking even though the power supply frequency fluctuates, and which is impervious to the effect of the positive or negative polarity of an input power supply.