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A wide load range,multi-mode synchronous buck DC-DC converter with a dynamic mode controller and adaptive slope compensation

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Journal of Semiconductors 2013年第6期34卷 102-109页

作者：张春红杨海钢史传进 Institute of Electronics Chinese Academy of Sciences University of Chinese Academy of Sciences Silicon System Research Laboratory Department of Electronic Engineering210EE/CES BuildingBox 352500University of Washington Seattle

A synchronous buck DC-DC converter with an adaptive multi-mode controller is *** order to achieve high efficiency over its entire load range,pulse-width modulation（PWM）,pulse-skip modulation（PSM） and pulse-frequency modulation（PFM） modes were integrated in the proposed DC-DC *** a highly accurate current sensor and a dynamic mode controller on chip,the converter can dynamically change among PWM, PSM and PFM control according to the load *** addition,to avoid power device damage caused by inrush current at the start up state,a soft-start circuit is presented to suppress the inrush ***,an adaptive slope compensation（SC） technique is proposed to stabilize the current programmed PWM controller for duty cycle passes over 50%,and improve the degraded load capability due to traditional slope *** buck converter chip was simulated and manufactured under a 0.35μm standard CMOS *** results show that the chip can achieve 79%to 91%efficiency over the load range of 0.1 to 1000 mA.

关键词： DC-DC multi-mode peak current mode slope compensation soft-start

Principle of designing slope compensation in PFC Boost converter

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Science in China(Series F) 2009年第11期52卷 2226-2233页

作者： ZHOU YuFei HUANG JiaCheng WANG ShiBing JIANG Wei CHEN JunNing School of Electronic Science and Technology Anhui University Hefei 230039 China

Due to wide input fluctuation with line frequency of 50 Hz, power-factor-correction （PFC） Boost converters tend to exhibit fast-scale instability over time domain. The traditional remedy is to impose slope compensation so as to weaken or eliminate this instability. A theoretical principle on the implementation of slope compensation signal is still lacking. Empirical design will induce over compensation frequently, resulting in a large decrease of power factor. In order to tackle this issue, by constructing the discrete-time iterative map of the PFC Boost converter from the viewpoint of bifurcation control theory of nonlinear systems, consequently, the criterion of critical stability for the PFC circuit can be established. Based on this stability criterion, appropriate design of slope compensation can be achieved. Our work indicates that 3 main circuit parameters （i.e. switching cycle, output reference voltage and inductor） determine the effective amplitude design of the slope compensation signal. The results, validated by a large quantity of analytical and numerical studies, show that appropriate slope compensation can be effective in weakening （or controlling） fast-scale bifurcation while maintaining a rather high input power factor.

关键词： PFC Boost converter peak current mode control slope compensation fast-scale bifurcation bifurcation control

A Piecewise Linear slope compensation Circuit for DC-DC Converters

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Journal of Semiconductors 2008年第2期29卷 281-287页

作者：叶强来新泉李演明袁冰陈富吉西安电子科技大学电路CAD所西安710071

To prevent sub-harmonic oscillation and improve the stability and load capacity of the system,a piecewise linear slope compensation circuit is designed. Compared with the traditional design, this circuit provides a compensation signal whose slope varies from different duty cycles at - 40-85℃ ,and reduces the negative effect of slope compensation on the system＇s load capacity and transient response. A current mode PWM Boost DC-DC converter employing this slope compensation circuit is implemented in a UMC 0.6μm-BCD process. The results indicate that the circuit works well and effectively,and the load capacity is increased by 20%. The chip area of the piecewise linear slope compensation circuit is 0.01mm^2 ,which consumes only 8μA quiescent current,and the efficiency ranges up to 93%.

关键词： DC-DC converter slope compensation piecewise linear duty cycle

Digital close loop control system for current-programmed mode arc welding inverter

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China Welding 2013年第2期22卷 76-82页

作者：李阳黄石生陆沛涛石永华 School of Mechanical and Automotive Engineering South China University of Technology Guangzhou 510641

A small-signal model of current programmed mode pulse width modulation converter including the equivalent sampling effect is introduced and analyzed. In this model, an addition pole is brought out by the sampling effect in the current loop gain, and it affects dynamic bandwidth and stability of the inner current loop. By selecting the appropriate stability parameter which determines the additional pole and describes the degree of peaking in closed loop transfer function, a control model of current programmed full bridge arc welding inverter with maximum frequency bandwidth and stability can be obtained. Small and large amplitude pulse current outputs are employed in simulations and experiments and results validate the design method.

关键词： current-programmed mode pulse width modulation digital control slope compensation arc welding inverter

SAR-GMTI investigation in hybrid along-and cross-track baseline InSAR

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Science in China(Series F) 2009年第8期52卷 1399-1408页

作者： SUO ZhiYong LI ZhenFang BAO Zheng WU JianXin National Key Lab of Radar Signal Processing Xidian University Xi'an 710071 China

A joint-pixel clutter suppression method based on slope compensation is proposed in this paper, In order to eliminate the effect of the terrain interferometric phase caused by the cross-track baseline in hybrid baseline InSAR, the local independent identical distribution of the clutter is satisfied by using the slope compensation technique, and thus the clutter can be suppressed successfully by using the orthogonality of the clutter subspace and the noise subspace. This approach utilizes the information contained in the current pixel as well as in its neighbors, showing robustness to the image coregistration errors. Both the simulated data and the real airborne data are used in proving the validity of the presented approach.

关键词： interferometric synthetic aperture radar (InSAR) along-/cross-track baseline ground moving target indication (GMTI) slope compensation clutter suppression