发明申请
- 专利标题： Step-up converter
- 专利标题（中）： 升压转换器
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申请号： US11905399申请日： 2007-09-28
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公开(公告)号： US20080211475A1公开(公告)日： 2008-09-04
- 发明人: Takuya Ishii , Mikio Motomori , Junichi Morita , Takashi Ryu , Masaaki Koto , Makoto Ishimaru , Kazuhito Kimura , Satoshi Wada
- 申请人： Takuya Ishii , Mikio Motomori , Junichi Morita , Takashi Ryu , Masaaki Koto , Makoto Ishimaru , Kazuhito Kimura , Satoshi Wada
- 优先权： JP2006-267191 20060929
- 主分类号： G05F1/565
- IPC分类号： G05F1/565
摘要：
The present invention provides a current-mode control step-up converter capable of reducing the minimum duty ratio to a sufficiently small value and facilitating the setting of the maximum duty ratio. The step-up converter comprises a current detector 9 for generating a current detection signal Vc corresponding to the current of a rectifier 4; an error amplifier 8 for generating an error signal Ve corresponding to an output DC voltage Vo; and a control circuit 10 for turning ON/OFF the main switch 3 on the basis of the current detection signal Vc and the error signal Ve. The control circuit 10 comprises a comparator 11 and a timer circuit 12. With this configuration, the ON time of the main switch 3 is set at a predetermined value, and the valley value of an inductor current changing in a triangular waveform is controlled. Hence, the OFF time of the main switch is adjusted to stabilize the output. Since the ON time of the main switch 3 can be set as desired, the minimum duty ratio can be reduced to zero or a sufficiently small value.
公开/授权文献
- US07825646B2 Step-up converter 公开/授权日：2010-11-02
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