EPE Association: EPE 2013 - LS4g: DC Power Supplies (hard&soft switching)

EPE 2013 - LS4g: DC Power Supplies (hard&soft switching)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 17: Power supplies > EPE 2013 - LS4g: DC Power Supplies (hard&soft switching)

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   Dynamic Characteristics of Hysteretic PWM Control Operated in Double Switching Frequency of Clock Signal
By Takaharu MOROTOMI, Terukazu SATO, Kimihiro NISHIJIMA, Takashi NABESHIMA [View]
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Abstract: This paper proposes a novel hysteretic PWM controller that consists of two comparators with hysteretic characteristics and OR gates. The proposed method operates in double switching frequency of the clock signal for synchronization with keeping the advantage of the excellent transient performance. In addition, this paper presents quantitative analysis for proper design of the control circuit. The presented analysis introduces a step change on the reference voltage at the input of hysteretic comparator and transfer functions of the hysteretic PWM controller with or without synchronization were revealed. Applying the proposed controller to the buck converter, it is confirmed that both theoretical results and measurements of the frequency responses agree well and the proposed method provides excellent transient performance with reduced ripple voltage at the higher switching frequency with synchronization.

   High Voltage Bi-directional Flyback Converter for Capacitive Actuator
By Prasanth THUMMALA, Zhe ZHANG, Michael ANDERSEN [View]
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Abstract: This paper presents a high voltage DC-DC converter topology for bi-directional energy transfer between a low voltage DC source and a high voltage capacitive load. The topology is a bi-directional flyback converter with variable switching frequency control during the charge mode, and constant switching frequency control during the discharge mode. The converter is capable of charging the capacitive load from 24 V DC source to 2.5 kV, and discharges it to 0 V. The flyback converter has been analyzed in detail during both charge and discharge modes, by considering all the parasitic elements in the converter, including the most dominating parameters of the high voltage transformer viz., self capacitance and leakage inductance. The specific capacitive load for this converter is a dielectric electro active polymer (DEAP) actuator, which can be used as an effective replacement for conventional actuators in a number of applications. In this paper, the discharging energy efficiency definition is introduced. The proposed converter has been experimentally tested with the film capacitive load and the DEAP actuator, and the experimental results are shown together with the efficiency measurements.

   POWER MANAGEMENT ARCHITECTURE FOR UNIVERSAL INPUT AC-DC ADAPTER SUPPORT IN BATTERY POWERED APPLICATIONS
By S M AHSANUZZAMAN, Justin BLACKMAN, Mor PERETZ, Aleksandar PRODIC [View]
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Abstract: This paper introduces a novel power management architecture for battery powered portable applications, where ac-dc power adapters are used to charge the battery. The flyback-based system allows independent regulation of output bus voltage, irrespective of adapter output, and battery cell voltages. This architecture creates the flexibility to use a wide range of adapters to power the device while charging the battery cells. The effectiveness of the introduced architecture is verified on a 20-W, 100 kHz experimental prototype. Experimental results demonstrate tight output bus voltage regulation over a wide range of adapter-provided dc inputs and smooth transitions between adapter and battery powered modes of operation.

EPE 2013 - LS4g: DC Power Supplies (hard&soft switching)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 17: Power supplies > EPE 2013 - LS4g: DC Power Supplies (hard&soft switching)
	[return to parent folder]

	Dynamic Characteristics of Hysteretic PWM Control Operated in Double Switching Frequency of Clock Signal By Takaharu MOROTOMI, Terukazu SATO, Kimihiro NISHIJIMA, Takashi NABESHIMA	[View] [Download]
Abstract: This paper proposes a novel hysteretic PWM controller that consists of two comparators with hysteretic characteristics and OR gates. The proposed method operates in double switching frequency of the clock signal for synchronization with keeping the advantage of the excellent transient performance. In addition, this paper presents quantitative analysis for proper design of the control circuit. The presented analysis introduces a step change on the reference voltage at the input of hysteretic comparator and transfer functions of the hysteretic PWM controller with or without synchronization were revealed. Applying the proposed controller to the buck converter, it is confirmed that both theoretical results and measurements of the frequency responses agree well and the proposed method provides excellent transient performance with reduced ripple voltage at the higher switching frequency with synchronization.

	High Voltage Bi-directional Flyback Converter for Capacitive Actuator By Prasanth THUMMALA, Zhe ZHANG, Michael ANDERSEN	[View] [Download]
Abstract: This paper presents a high voltage DC-DC converter topology for bi-directional energy transfer between a low voltage DC source and a high voltage capacitive load. The topology is a bi-directional flyback converter with variable switching frequency control during the charge mode, and constant switching frequency control during the discharge mode. The converter is capable of charging the capacitive load from 24 V DC source to 2.5 kV, and discharges it to 0 V. The flyback converter has been analyzed in detail during both charge and discharge modes, by considering all the parasitic elements in the converter, including the most dominating parameters of the high voltage transformer viz., self capacitance and leakage inductance. The specific capacitive load for this converter is a dielectric electro active polymer (DEAP) actuator, which can be used as an effective replacement for conventional actuators in a number of applications. In this paper, the discharging energy efficiency definition is introduced. The proposed converter has been experimentally tested with the film capacitive load and the DEAP actuator, and the experimental results are shown together with the efficiency measurements.

	POWER MANAGEMENT ARCHITECTURE FOR UNIVERSAL INPUT AC-DC ADAPTER SUPPORT IN BATTERY POWERED APPLICATIONS By S M AHSANUZZAMAN, Justin BLACKMAN, Mor PERETZ, Aleksandar PRODIC	[View] [Download]
Abstract: This paper introduces a novel power management architecture for battery powered portable applications, where ac-dc power adapters are used to charge the battery. The flyback-based system allows independent regulation of output bus voltage, irrespective of adapter output, and battery cell voltages. This architecture creates the flexibility to use a wide range of adapters to power the device while charging the battery cells. The effectiveness of the introduced architecture is verified on a 20-W, 100 kHz experimental prototype. Experimental results demonstrate tight output bus voltage regulation over a wide range of adapter-provided dc inputs and smooth transitions between adapter and battery powered modes of operation.