Invention Grant
US08410767B2 Control circuit of DC-DC converter applying offset to coil current, DC-DC converter applying offset to coil current and control method of DC-DC converter
有权
DC-DC转换器的控制电路施加偏置到线圈电流，施加偏置到线圈电流的DC-DC转换器和DC-DC转换器的控制方法
- Patent Title: Control circuit of DC-DC converter applying offset to coil current, DC-DC converter applying offset to coil current and control method of DC-DC converter
- Patent Title (中): DC-DC转换器的控制电路施加偏置到线圈电流，施加偏置到线圈电流的DC-DC转换器和DC-DC转换器的控制方法
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Application No.: US12475982Application Date: 2009-06-01
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Publication No.: US08410767B2Publication Date: 2013-04-02
- Inventor: Toru Miyamae
- Applicant: Toru Miyamae
- Applicant Address: JP Yokohama
- Assignee: Fujitsu Semiconductor Limited
- Current Assignee: Fujitsu Semiconductor Limited
- Current Assignee Address: JP Yokohama
- Agency: Fujitsu Patent Center
- Priority: JP2008-153889 20080612
- Main IPC: G05F1/00
- IPC: G05F1/00
Abstract:
A DC-DC converter or the like capable of generating a stable output voltage is provided. A control circuit 11 of a current mode step-down DC-DC converter 1 includes a slope compensation circuit SC and an offset circuit IF1. The slope compensation circuit SC adds an increase gradient m2 due to slope compensation to an increase gradient of a coil current waveform Vsense in a range wherein an ON period Ton of a switch SW1 exceeds ½ of an operating cycle T. An offset circuit IF1 applies an offset voltage Voffset which becomes smaller depending on the ON period Ton in excess of ½ of an operating cycle T, to a coil current waveform Vsense.
Public/Granted literature
- US20090309557A1 CONTROL CIRCUIT OF DC-DC CONVERTER, DC-DC CONVERTER AND CONTROL METHOD OF DC-DC CONVERTER Public/Granted day:2009-12-17
Information query
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