Jin Sha - Academia.edu (original) (raw)
Papers by Jin Sha
IEEE Transactions on Industrial Electronics, 2016
It is known that ripple-based control of a switching dc-dc converter benefits from a faster trans... more It is known that ripple-based control of a switching dc-dc converter benefits from a faster transient response than a conventional PWM control switching dc-dc converter. However, ripple-based control switching dc-dc converters may suffer from fast-scale oscillation. In order to achieve fast transient response and ensure stable operation of a switching dc-dc converter over a wide load range, based on a conventional pulse train control technique, a peak capacitor current pulse train (PCC-PT) control technique is proposed in this paper. With a buck converter as an example, the operating modes, steady-state performance and transient respond performance of a PCC-PT controlled buck converter are presented and assessed. To eliminate fast-scale oscillation, circuit and control parameter design consideration are given. An accurate discrete iteration model of a PCC-PT controlled buck converter is established, based on which, the effects of circuit parameters on stability of converter operating in a DCM mode, mixed DCM-CCM mode, and CCM mode are studied. Simulation and experimental results are presented to verify the analysis results. Index Terms-Capacitor current feedback, pulse train control, switching DC-DC converter, wide load range I. INTRODUCTION WITCHING DC-DC converters have been widely used in portable electronic devices, such as mobile phones, notebooks and tablet PC. In some applications, the load power of switching dc-dc converters varies widely and rapidly [1-3]. Various control techniques, such as V 2 control, constant-ontime (COT) control or constant-off-time (CFT) control, and pulse train (PT) control [4-10], have been reported to improve transient response speed of switching dc-dc converters. These control techniques, called 'ripple-based control' techniques [11], regulate the output voltage of switching DC-DC
8th International Conference on Power Electronics - ECCE Asia, 2011
ABSTRACT 2control technique for switching converters is proposed in this paper. By utilizing outp... more ABSTRACT 2control technique for switching converters is proposed in this paper. By utilizing output voltage ripple as pulse-width modulation ramp and valley voltage of output voltage ripple as additional control variable, valley V 2 control technique provides faster load transient response than conventional current-mode control techniques. Steady-state and transient performances of switching converters with valley V 2 control, peak V 2 control, and current-mode
IEEE Transactions on Industrial Electronics, 2014
ABSTRACT
IEEE Transactions on Industrial Electronics, 2014
Current-mode pulse train (CMPT) control technique, a novel discrete control technique for switchi... more Current-mode pulse train (CMPT) control technique, a novel discrete control technique for switching dc-dc converters, has completely different dynamics from the traditional PWM control technique. In this paper, a one-dimensional (1-D) normal form of discrete-time map of CMPT controlled buck converter operating in discontinuous conduction mode (DCM) is established, upon which the effects of circuit parameters on the dynamics and the border collision bifurcation behaviors of CMPT controlled DCM buck converter are observed and analyzed. According to discrete iterative maps of period-1, period-2 and period-3, the fixed point analyses of the corresponding periodicities are studied, and the mechanism of border collision bifurcation is revealed. Simultaneously, the parameter conditions of different periodicities are formulated, which are helpful to better understand the behaviors and to analyze the CMPT controlled buck converter.
Electronics Letters, 2014
IEEE Transactions on Industrial Electronics, 2016
It is known that ripple-based control of a switching dc-dc converter benefits from a faster trans... more It is known that ripple-based control of a switching dc-dc converter benefits from a faster transient response than a conventional PWM control switching dc-dc converter. However, ripple-based control switching dc-dc converters may suffer from fast-scale oscillation. In order to achieve fast transient response and ensure stable operation of a switching dc-dc converter over a wide load range, based on a conventional pulse train control technique, a peak capacitor current pulse train (PCC-PT) control technique is proposed in this paper. With a buck converter as an example, the operating modes, steady-state performance and transient respond performance of a PCC-PT controlled buck converter are presented and assessed. To eliminate fast-scale oscillation, circuit and control parameter design consideration are given. An accurate discrete iteration model of a PCC-PT controlled buck converter is established, based on which, the effects of circuit parameters on stability of converter operating in a DCM mode, mixed DCM-CCM mode, and CCM mode are studied. Simulation and experimental results are presented to verify the analysis results. Index Terms-Capacitor current feedback, pulse train control, switching DC-DC converter, wide load range I. INTRODUCTION WITCHING DC-DC converters have been widely used in portable electronic devices, such as mobile phones, notebooks and tablet PC. In some applications, the load power of switching dc-dc converters varies widely and rapidly [1-3]. Various control techniques, such as V 2 control, constant-ontime (COT) control or constant-off-time (CFT) control, and pulse train (PT) control [4-10], have been reported to improve transient response speed of switching dc-dc converters. These control techniques, called 'ripple-based control' techniques [11], regulate the output voltage of switching DC-DC
8th International Conference on Power Electronics - ECCE Asia, 2011
ABSTRACT 2control technique for switching converters is proposed in this paper. By utilizing outp... more ABSTRACT 2control technique for switching converters is proposed in this paper. By utilizing output voltage ripple as pulse-width modulation ramp and valley voltage of output voltage ripple as additional control variable, valley V 2 control technique provides faster load transient response than conventional current-mode control techniques. Steady-state and transient performances of switching converters with valley V 2 control, peak V 2 control, and current-mode
IEEE Transactions on Industrial Electronics, 2014
ABSTRACT
IEEE Transactions on Industrial Electronics, 2014
Current-mode pulse train (CMPT) control technique, a novel discrete control technique for switchi... more Current-mode pulse train (CMPT) control technique, a novel discrete control technique for switching dc-dc converters, has completely different dynamics from the traditional PWM control technique. In this paper, a one-dimensional (1-D) normal form of discrete-time map of CMPT controlled buck converter operating in discontinuous conduction mode (DCM) is established, upon which the effects of circuit parameters on the dynamics and the border collision bifurcation behaviors of CMPT controlled DCM buck converter are observed and analyzed. According to discrete iterative maps of period-1, period-2 and period-3, the fixed point analyses of the corresponding periodicities are studied, and the mechanism of border collision bifurcation is revealed. Simultaneously, the parameter conditions of different periodicities are formulated, which are helpful to better understand the behaviors and to analyze the CMPT controlled buck converter.
Electronics Letters, 2014