EPE Association: EPE 2005 - Topic 05-2 - LS: Converter control, current/voltage control

EPE 2005 - Topic 05-2 - LS: Converter control, current/voltage control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 05: MODULATION STRATEGIES AND SPECIFIC CONTROL METHODS FOR STATIC CONVERTERS > EPE 2005 - Topic 05-2 - LS: Converter control, current/voltage control

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   Four-quadrant flyback converter for direct audio power amplification
By ANDERSEN Michael; LJUSEV Petar [View]
[Download]

Abstract: This paper presents a bidirectional, four-quadrant flyback converter for use in direct audio power amplification. When compared to the standard Class-D switching-mode audio power amplifier with separate power supply, the proposed four-quadrant flyback converter provides simple and compact solution with high efficiency, higher level of integration, lower component count, less board spaceand eventually lower cost. Both peak and average current-mode control for use with 4Q flyback power converters are described and compared. Integrated magnetics is presented which simplifies the construction of the auxiliary power supplies for control biasing and isolated gate drives. The feasibility of the approach is proven on audio power amplifier prototype for subwoofer applications.

   FPGA based Multi-Sampling Pulse Compensation Method with Deadbeat Control for Single Phase PWM Inverter
By FUJII Takahiro; YOKOYAMA Tomoki [View]
[Download]

Abstract: A new approach of deadbeat control with multi-sampling pulse compensation method for single phasePWM inverter using FPGA based hardware controller is proposed. Using FPGA, 1MHz multi-samplingbetween the carrier interval can be realized to improve the tracking accuracy of the inverter voltage to thereference. Control characteristic of the proposed deadbeat control method was verified through simulationsand experiments with various digital control methods.

   Load invariant buck converter-Analysis and implementation
By HANKANIEMI Mikko; RUOTSALAINEN Sari; SUNTIO Teuvo [View]
[Download]

Abstract: Direct-load-current feedback in a peak-current-mode-controlled buck converter is used to obtain near zero open-loop output impedance. Theoretical formulation is derived utilizing two-port modeling technique. The ideal unity-feadback output imepdance would resemble the output impedance of a voltage-mode-controlled buck converter but without the resonant behavior. The maximum output impedance would be the equivalent series resistances of the inductor and capacitor branches. It will be shown that the output impedance would approach the amgnitude of the output impedance of the original converter, i.e., the load invariance would be gradually lost, if the equivalent current sensing resistors differ from each other sufficiently. In addition, the output impedance can resemble negative incremental resistor at low frequencies, and may cause excess peaking during the output load transients.

   Theoretical Output Current Spectra of Three Phase Current Source Converters
By FUCHS Friedrich Wilhelm; BIERHOFF Michael [View]
[Download]

Abstract: The geometric-wall-model by Black has successfully been applied to calculate the harmonic spectra ofvoltage source converters. This paper derives the application of the geometric-wall-model on the outputcurrents of a current source converter, CSC, by utilizing duality considerations to voltage sourceconverters to determine the spectra of the pulsed output currents occurring in a CSC.

EPE 2005 - Topic 05-2 - LS: Converter control, current/voltage control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 05: MODULATION STRATEGIES AND SPECIFIC CONTROL METHODS FOR STATIC CONVERTERS > EPE 2005 - Topic 05-2 - LS: Converter control, current/voltage control
	[return to parent folder]

	Four-quadrant flyback converter for direct audio power amplification By ANDERSEN Michael; LJUSEV Petar	[View] [Download]
Abstract: This paper presents a bidirectional, four-quadrant flyback converter for use in direct audio power amplification. When compared to the standard Class-D switching-mode audio power amplifier with separate power supply, the proposed four-quadrant flyback converter provides simple and compact solution with high efficiency, higher level of integration, lower component count, less board spaceand eventually lower cost. Both peak and average current-mode control for use with 4Q flyback power converters are described and compared. Integrated magnetics is presented which simplifies the construction of the auxiliary power supplies for control biasing and isolated gate drives. The feasibility of the approach is proven on audio power amplifier prototype for subwoofer applications.

	FPGA based Multi-Sampling Pulse Compensation Method with Deadbeat Control for Single Phase PWM Inverter By FUJII Takahiro; YOKOYAMA Tomoki	[View] [Download]
Abstract: A new approach of deadbeat control with multi-sampling pulse compensation method for single phasePWM inverter using FPGA based hardware controller is proposed. Using FPGA, 1MHz multi-samplingbetween the carrier interval can be realized to improve the tracking accuracy of the inverter voltage to thereference. Control characteristic of the proposed deadbeat control method was verified through simulationsand experiments with various digital control methods.

	Load invariant buck converter-Analysis and implementation By HANKANIEMI Mikko; RUOTSALAINEN Sari; SUNTIO Teuvo	[View] [Download]
Abstract: Direct-load-current feedback in a peak-current-mode-controlled buck converter is used to obtain near zero open-loop output impedance. Theoretical formulation is derived utilizing two-port modeling technique. The ideal unity-feadback output imepdance would resemble the output impedance of a voltage-mode-controlled buck converter but without the resonant behavior. The maximum output impedance would be the equivalent series resistances of the inductor and capacitor branches. It will be shown that the output impedance would approach the amgnitude of the output impedance of the original converter, i.e., the load invariance would be gradually lost, if the equivalent current sensing resistors differ from each other sufficiently. In addition, the output impedance can resemble negative incremental resistor at low frequencies, and may cause excess peaking during the output load transients.

	Theoretical Output Current Spectra of Three Phase Current Source Converters By FUCHS Friedrich Wilhelm; BIERHOFF Michael	[View] [Download]
Abstract: The geometric-wall-model by Black has successfully been applied to calculate the harmonic spectra ofvoltage source converters. This paper derives the application of the geometric-wall-model on the outputcurrents of a current source converter, CSC, by utilizing duality considerations to voltage sourceconverters to determine the spectra of the pulsed output currents occurring in a CSC.