EPE Association: NORpie 2002 - Topic 10: CONTROL OF SMPS

NORpie 2002 - Topic 10: CONTROL OF SMPS
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2002 > NORpie 2002 - Topic 10: CONTROL OF SMPS

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   Fundamental Limitations in the Control Performance of Switched-Mode Power Supplies
By K. Zenger; I. Gadoura; T. Suntio [View]
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Abstract: The fundamental limitations to system performance caused by anomalies of the process are discussed in the paper. The example case of a boost topology, which has a right half plane (RHP) zero, is used to demonstrate that there is an upper bound of the bandwith caused by the zero. The claim that in peak-current mode control the effect of a RHP zero to system performance would somehow "disappear" is shown to be incorrect.

   Switched Controllers Applied to an LCC Converter - Control Law Evaluation
By A.Hultgren; P. Ingelbrandt; P. Ranstad; M. Nilsson; M. Lenells [View]
[Download]

Abstract: Different state feedback controllers are applied and tested in an electronic power converter. The converter is non-linear and can be modelled by sets of differential equations, each set modelling the converter in a specific region of the state space. The control laws are based on phase plane feedback. The controllers are evaluated according to initial value disturbance, load voltage disturbance, supply voltage disturbance and robustness. The evaluation is performed as simulation and as experiment in a real physical converter.

   Small-Signal Modelling of Switched-Mode Converters - A Unified Approach
By T. Suntio; I. Gadoura; K. Zenger [View]
[Download]

Abstract: Small-signal modeling of switched-mode converters dates back to early 70's, when teh state-space averaging (SSA) method was introduced for assessing the dynamics of direct-duty-ratio controlled converters in continuous conduction mode (CCM). It turned out that the SSA method could not be applied directly to model discontinuous mode (DCM) of operation or other control methods such as current-mode control. We will present in this paper a unified approach to model direct-duty-ration control valid both in CCM and DCM. The technique is extended to modeling of current-mode control but only peak-current-mode control is explicitly covered in CCM.

   Improved Dynamic Performance of Multiloop Operation of Paralleled DC/DC Converters Using Fuzzy-Logic Control
By I. Gadoura; K. Zenger; T. Suntio [View]
[Download]

Abstract: In this paper we utilizes the design of robust PI/PID control for paralleled DC/DC converters that has been reported in our previous work in order to design PID-like FLC for voltage-loop and PI-like FLC for current-loop. The variations of power components have been taken into account as an uncertainty when designing the robust PI/PID control. The PID-like FLC and PI-like FLC are designed to guarantee robust output voltage and to equalize the output currents, respectively. In the simulation the fuzzy-logic control has an advantage of less control effort over the conventional PI/PID control.

NORpie 2002 - Topic 10: CONTROL OF SMPS
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2002 > NORpie 2002 - Topic 10: CONTROL OF SMPS
	[return to parent folder]

	Fundamental Limitations in the Control Performance of Switched-Mode Power Supplies By K. Zenger; I. Gadoura; T. Suntio	[View] [Download]
Abstract: The fundamental limitations to system performance caused by anomalies of the process are discussed in the paper. The example case of a boost topology, which has a right half plane (RHP) zero, is used to demonstrate that there is an upper bound of the bandwith caused by the zero. The claim that in peak-current mode control the effect of a RHP zero to system performance would somehow "disappear" is shown to be incorrect.

	Switched Controllers Applied to an LCC Converter - Control Law Evaluation By A.Hultgren; P. Ingelbrandt; P. Ranstad; M. Nilsson; M. Lenells	[View] [Download]
Abstract: Different state feedback controllers are applied and tested in an electronic power converter. The converter is non-linear and can be modelled by sets of differential equations, each set modelling the converter in a specific region of the state space. The control laws are based on phase plane feedback. The controllers are evaluated according to initial value disturbance, load voltage disturbance, supply voltage disturbance and robustness. The evaluation is performed as simulation and as experiment in a real physical converter.

	Small-Signal Modelling of Switched-Mode Converters - A Unified Approach By T. Suntio; I. Gadoura; K. Zenger	[View] [Download]
Abstract: Small-signal modeling of switched-mode converters dates back to early 70's, when teh state-space averaging (SSA) method was introduced for assessing the dynamics of direct-duty-ratio controlled converters in continuous conduction mode (CCM). It turned out that the SSA method could not be applied directly to model discontinuous mode (DCM) of operation or other control methods such as current-mode control. We will present in this paper a unified approach to model direct-duty-ration control valid both in CCM and DCM. The technique is extended to modeling of current-mode control but only peak-current-mode control is explicitly covered in CCM.

	Improved Dynamic Performance of Multiloop Operation of Paralleled DC/DC Converters Using Fuzzy-Logic Control By I. Gadoura; K. Zenger; T. Suntio	[View] [Download]
Abstract: In this paper we utilizes the design of robust PI/PID control for paralleled DC/DC converters that has been reported in our previous work in order to design PID-like FLC for voltage-loop and PI-like FLC for current-loop. The variations of power components have been taken into account as an uncertainty when designing the robust PI/PID control. The PID-like FLC and PI-like FLC are designed to guarantee robust output voltage and to equalize the output currents, respectively. In the simulation the fuzzy-logic control has an advantage of less control effort over the conventional PI/PID control.