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A novel charge pump with variable frequency modulation (VFM) is proposed in this paper. To provide base for its design and improvement, detailed models for VFM charge pump are derived. And it is successfully implemented for the charge pump to introduce a voltage controlled oscillator (VCO) to control the switching frequency, which results in its high efficiency and low ripple output both at high load...
For a long time, the theory and practice of urban land and urban transit planning only pay attention to the demand on urban rail transit from land, but not sufficiently consider the reaction of traffic on the site. Recently, the relationship between urban land use and urban transit becomes more and more attention by the scholars. During the process of the modification of urban space layout, it is...
This paper presents a capacitor current based adaptive hysteresis controlled DC-DC converter. This controller avoids wide range frequency band filter or complicated compensation. Based on that capacitor current reflects the load current directly and fast, the proposed system uses a simple analog differentiator to sense the voltage capacitor current. Meanwhile, a PI compensation loop is added to improve...
Higher engineering education (HEE) is an important stage of training qualified engineers. Main problems and difficulties for training qualified engineers in current China HEE were analyzed; ldquoReturn to engineeringrdquo educational reform featured by novel type of university industry cooperation was explored. More than seven year practice in the college of computer software of Zhejiang University...
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