发明名称 |
DC-to-DC step-up converter and conversion method thereof |
摘要 |
The present invention discloses a DC-to-DC step-up converter to which a logic control unit is added in order to reduce the ripples of a DC output voltage and improve the power quality. The converter of the present invention comprises a step-up circuit, a ring oscillator, a divider circuit, a PFM (pulse frequency modulation) comparator and a logic control unit. The step-up circuit is used to step up a source voltage to generate a DC output voltage. The ring oscillator is used to generate an oscillator output signal. The divider circuit receives the DC output voltage to generate a feedback voltage. The PFM comparator compares the feedback voltage with a reference voltage to generate a comparator output signal to control outputting of the oscillator output signal. The logic control unit is used to make the conductive period of a MOS transistor in the step-up circuit identical to the high-level period of an output signal of the ring oscillator to reduce the noise and the ripple of the DC output voltage of the converter.
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申请公布号 |
US7245114(B2) |
申请公布日期 |
2007.07.17 |
申请号 |
US20050181780 |
申请日期 |
2005.07.15 |
申请人 |
ADVANCED ANALOG TECHNOLOGY, INC. |
发明人 |
CHU CHU YU;SUN YOU MIN;JIAN MAO CYUAN;LIAO SHIH JIE |
分类号 |
G05F1/40 |
主分类号 |
G05F1/40 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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