发明申请
- 专利标题: Step-up power supply device
- 专利标题(中): 升压电源装置
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申请号: US11898701申请日: 2007-09-14
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公开(公告)号: US20080074158A1公开(公告)日: 2008-03-27
- 发明人: Takashi Ryu , Takuya Ishii , Mikio Motomori , Kazuhito Kimura , Satoshi Wada , Rumi Nakai
- 申请人: Takashi Ryu , Takuya Ishii , Mikio Motomori , Kazuhito Kimura , Satoshi Wada , Rumi Nakai
- 优先权: JP2006-257056 20060922
- 主分类号: H03L7/00
- IPC分类号: H03L7/00
摘要:
A step-up power supply device includes: a step-up converter; a startup circuit which controls the on/off operation of a switch element of the step-up converter when an output voltage of the device is smaller than a reference voltage; and a control circuit which operates in substitution for the startup circuit when the output voltage is higher than the reference voltage to control the on/off operation of the switch element such that the output voltage reaches a target value. The startup circuit includes an oscillation circuit for generating a pulse signal which has a predetermined on/off ratio, a current comparison circuit for comparing a current of the switch element with a predetermined restriction value, and a drive circuit for generating a drive signal based on which the switch element is turned on/off, the drive signal being generated from the pulse signal to turn on the switch element, and the drive signal being generated from the output of the current comparison circuit or the pulse signal to turn off the switch element.
公开/授权文献
- US07567069B2 Step-up power supply device 公开/授权日:2009-07-28