发明申请
- 专利标题： Two-stage voltage regulators with adjustable intermediate bus voltage, adjustable switching frequency, and adjustable number of active phases
- 专利标题（中）： 两级电压调节器，可调节中间总线电压，可调开关频率和可调节数量的有源相
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申请号： US11018920申请日： 2004-12-22
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公开(公告)号： US20050184713A1公开(公告)日： 2005-08-25
- 发明人: Ming Xu , Jinghai Zhou , Yuancheng Ren , Fred Lee , Jia Wei
- 申请人： Ming Xu , Jinghai Zhou , Yuancheng Ren , Fred Lee , Jia Wei
- 主分类号： G05F1/40
- IPC分类号： G05F1/40 ; H02M3/156
摘要：
A two-stage power converter that dynamically adjusts to output current requirements includes a first stage regulator that provides power to a second stage regulator. The first stage can be a buck converter, and the second stage can be a multiple-phase buck converter. The output voltage of the first stage (intermediate bus voltage Vbus) is varied according to the load current to optimize conversion efficiency. To provide maximum efficiency, the Vbus voltage is increased as load current increases. The Vbus voltage provided by the first stage can be varied by duty cycle or operating frequency control. In another embodiment, the switching frequency of the second stage is varied as output current changes so that output current ripple is held constant. In an embodiment employing a multiple-phase buck converter in the second stage, the number of operating phases are varied as output current changes.
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