EPE Association: EPE 2003 - Topic 08d: Voltage Regulated Modules (VRM)

EPE 2003 - Topic 08d: Voltage Regulated Modules (VRM)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2003 - Conference > EPE 2003 - Topic 08: POWER SUPPLIES > EPE 2003 - Topic 08d: Voltage Regulated Modules (VRM)

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   Parameter independant phase tracking method for sensorless control of PWM power supply rectifiers
By P. Szczupak; M. Linke; R. Kennel [View]
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Abstract: In this paper a new parameter independant sensorless control strategy for a voltage oriented controlled (VOC) three phase pulsewidth modulated (PWM) power supply rectifier is presented. This control method requires neither the measured AC-line voltages nor any accurate circuit parameters for estimation purposes. Furthermore, there is no need for additional test signals. There are no additional hardware requirements with respect to the standard drive inverters available in the market which usually are not equipped with AC-side voltage sensors. It will be seen that the calculation demand for the sensorless approach is negligible in comparison to the erquirements for the control itself. This approach makes use of the slow varying AC-line voltage - the sample frequency of the inverter is at least ten times higher. The principle of the proposed method is explained, and its effectiveness is proven experimentally.

   DSP-based control of a VRM topology using interleaved buck converters
By H. Güldner; H. Wolf; J. Losansky; F. Eckholz [View]
[Download]

Abstract: Voltage Regulator Module (VRM) configurations are replacing single stage topologies due to their higher power density together with a faster transient response for demanding loads. Considering the field of dc power supplies for microprocessors the VRM approach can be extended to higher power ranges. The paper deals with the design and implementation of a digital control concept for a 100kW buck converter system with special respect to the current distribution.

   Fast-response VRM using current amplification and absorption
By T. Senanayake; T. Ninomiya [View]
[Download]

Abstract: Today`s high-performance microprocessor present many challenges to their power source. High power consumption, low bus voltages and fast load changes are the principal characteristics which have led to the need for a high performance switch-mode DC-DC converter with tight output voltage tolerance. In this paper a new fast-response voltage regulator module (VRM) design is presented that will meet the requirements and features of the new generation of microprocessors and digital systems. It is able to produce high slew rate of load current and capability to keep constant the output voltage in case of severe load changes.

   Loss analysis of a single phase fast transient VRM Converter
By Y. Y. Law; J. C.P. Liu; N.K. Poon; M.H. Pong [View]
[Download]

Abstract: This paper analyzes losses of the stepping inductor converter in the presence of load transients. Stepping inductor converter is a new VRM topology which employs a single phase only. Stepping inductor converter is very effective in dealing with fast transient and gives better steady state efficiency at the same time. Occurences of transient load current changes are measured in a personal computer. Data are used to evaluate the real world performance of the stepping inductor converter.

EPE 2003 - Topic 08d: Voltage Regulated Modules (VRM)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2003 - Conference > EPE 2003 - Topic 08: POWER SUPPLIES > EPE 2003 - Topic 08d: Voltage Regulated Modules (VRM)
	[return to parent folder]

	Parameter independant phase tracking method for sensorless control of PWM power supply rectifiers By P. Szczupak; M. Linke; R. Kennel	[View] [Download]
Abstract: In this paper a new parameter independant sensorless control strategy for a voltage oriented controlled (VOC) three phase pulsewidth modulated (PWM) power supply rectifier is presented. This control method requires neither the measured AC-line voltages nor any accurate circuit parameters for estimation purposes. Furthermore, there is no need for additional test signals. There are no additional hardware requirements with respect to the standard drive inverters available in the market which usually are not equipped with AC-side voltage sensors. It will be seen that the calculation demand for the sensorless approach is negligible in comparison to the erquirements for the control itself. This approach makes use of the slow varying AC-line voltage - the sample frequency of the inverter is at least ten times higher. The principle of the proposed method is explained, and its effectiveness is proven experimentally.

	DSP-based control of a VRM topology using interleaved buck converters By H. Güldner; H. Wolf; J. Losansky; F. Eckholz	[View] [Download]
Abstract: Voltage Regulator Module (VRM) configurations are replacing single stage topologies due to their higher power density together with a faster transient response for demanding loads. Considering the field of dc power supplies for microprocessors the VRM approach can be extended to higher power ranges. The paper deals with the design and implementation of a digital control concept for a 100kW buck converter system with special respect to the current distribution.

	Fast-response VRM using current amplification and absorption By T. Senanayake; T. Ninomiya	[View] [Download]
Abstract: Today`s high-performance microprocessor present many challenges to their power source. High power consumption, low bus voltages and fast load changes are the principal characteristics which have led to the need for a high performance switch-mode DC-DC converter with tight output voltage tolerance. In this paper a new fast-response voltage regulator module (VRM) design is presented that will meet the requirements and features of the new generation of microprocessors and digital systems. It is able to produce high slew rate of load current and capability to keep constant the output voltage in case of severe load changes.

	Loss analysis of a single phase fast transient VRM Converter By Y. Y. Law; J. C.P. Liu; N.K. Poon; M.H. Pong	[View] [Download]
Abstract: This paper analyzes losses of the stepping inductor converter in the presence of load transients. Stepping inductor converter is a new VRM topology which employs a single phase only. Stepping inductor converter is very effective in dealing with fast transient and gives better steady state efficiency at the same time. Occurences of transient load current changes are measured in a personal computer. Data are used to evaluate the real world performance of the stepping inductor converter.