EPE Association: EPE 1993 - 22 - Lecture Session L8a: POWER SUPPLIES: DC v AC LINK SIMULATION APPLICATIONS

EPE 1993 - 22 - Lecture Session L8a: POWER SUPPLIES: DC v AC LINK SIMULATION APPLICATIONS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1993 - Conference > EPE 1993 - 22 - Lecture Session L8a: POWER SUPPLIES: DC v AC LINK SIMULATION APPLICATIONS

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   COMPARISON OF POWER CONVERTERS WITH DC AND AC LINK
By J. Petzoldt; S. Bernet; T. Reimann [View]
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Abstract: At present, power converter systems with DC link on the basis of hard switching dominate in the field of power electronics. Wanted low loss switching processes can be achieved by using Zero Current Switches (ZCS) and Zero Voltage Switches (ZVS). Without additional resonant circuits in the load or switch branches ZCS and ZVS can be applied in DC and AC link converters, in which the main switch arms have got commutating units. In this paper, a cornparative view of the characteristics of hard switching DC link- and soft switching DC- and AC link converters is presented. Essential dissipative components are investigated and checked by measurements at various working points for a single phase converter. The calculation of the total losses of the three-phase converter systems in various working points is the basis of a comparison of the several systems. Specific advantages and disadvantages of the converters are discussed.

   10 kVA FOUR LEVEL INVERTER WITH SYMMETRICAL INPUT VOLTAGE DISTRIBUTION
By O. Apeldoorn; L. Schulting [View]
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Abstract: In this paper a four level inverter is presented. Making use of 1200V IGBTs a switching frequency of 20kHz was realized. Under no-load conditions the blocking voltage of each switching device is equal to one third of the input voltage. The symmetrical voltage distribution of the Four Level Inverter tends to drift away if it is driving a load current. This problem is solved by an additional circuit which guarantees a symmetrical voltage distribution in each point of operation. Typical features of the proposed circuit are that it works reliable independent of the load and with any input voltage (e.g. if the input voltage varies between a high and a low value). Other advantages are that no additional switching devices are needed and that losses are minimized. The theoretical investigations are verified with measurements made with a 10 kW prototype.

   MODELLING AND ANALYSIS OF THE FULLY-INTEGRATED MAGNETICS DC-ISOLATED CUK CONVERTER
By Marek S.Makowski; Andrew J. Forsyth [View]
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Abstract: In the paper the small- signal low-frequency model of the cuk converter with inductors and dc-isolation transformer integrated on one core is derived and published for the first time. Since the structure is a complex one attention is turned to the task of finding the simplest possible means for evaluating network functions. A generalized node-pair analysis is proposed. The factored design oriented form of the model enables optimization of the converter dynamics. Full supporting practical measurements are included.

   PSPICE SIMULATIONS AND 3D-PCB TRANSFORMERS FOR ZVS FULL BRIDGE CONVERTERS
By A. Wyns; D. Bogaerts; J. L. Van Eck; P. Mathys [View]
[Download]

Abstract: This paper presents a compact 800 W ZVS full bridge converter (500 kHz) designed by using advanced simulation techniques on PSPICE and an innovative low-leakage toroidal power transformer. The use of SPICE models for power MOSFETs and power diodes has made it easier to design the fixed-frequency, quasi-resonant, phase-shift, full bridge topology finally selected. This new and very compact power supply uses a combination of advanced circuit design and technological breakthroughs. The use of SMDs and multi-layer ceramic capacitors reduces space and increases circuit reliability. The low-leakage toroidal transformer is realised by using a patented three-dimensional printed-circuit board technique which is revolutionary. The converter is currently in production.

EPE 1993 - 22 - Lecture Session L8a: POWER SUPPLIES: DC v AC LINK SIMULATION APPLICATIONS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1993 - Conference > EPE 1993 - 22 - Lecture Session L8a: POWER SUPPLIES: DC v AC LINK SIMULATION APPLICATIONS
	[return to parent folder]

	COMPARISON OF POWER CONVERTERS WITH DC AND AC LINK By J. Petzoldt; S. Bernet; T. Reimann	[View] [Download]
Abstract: At present, power converter systems with DC link on the basis of hard switching dominate in the field of power electronics. Wanted low loss switching processes can be achieved by using Zero Current Switches (ZCS) and Zero Voltage Switches (ZVS). Without additional resonant circuits in the load or switch branches ZCS and ZVS can be applied in DC and AC link converters, in which the main switch arms have got commutating units. In this paper, a cornparative view of the characteristics of hard switching DC link- and soft switching DC- and AC link converters is presented. Essential dissipative components are investigated and checked by measurements at various working points for a single phase converter. The calculation of the total losses of the three-phase converter systems in various working points is the basis of a comparison of the several systems. Specific advantages and disadvantages of the converters are discussed.

	10 kVA FOUR LEVEL INVERTER WITH SYMMETRICAL INPUT VOLTAGE DISTRIBUTION By O. Apeldoorn; L. Schulting	[View] [Download]
Abstract: In this paper a four level inverter is presented. Making use of 1200V IGBTs a switching frequency of 20kHz was realized. Under no-load conditions the blocking voltage of each switching device is equal to one third of the input voltage. The symmetrical voltage distribution of the Four Level Inverter tends to drift away if it is driving a load current. This problem is solved by an additional circuit which guarantees a symmetrical voltage distribution in each point of operation. Typical features of the proposed circuit are that it works reliable independent of the load and with any input voltage (e.g. if the input voltage varies between a high and a low value). Other advantages are that no additional switching devices are needed and that losses are minimized. The theoretical investigations are verified with measurements made with a 10 kW prototype.

	MODELLING AND ANALYSIS OF THE FULLY-INTEGRATED MAGNETICS DC-ISOLATED CUK CONVERTER By Marek S.Makowski; Andrew J. Forsyth	[View] [Download]
Abstract: In the paper the small- signal low-frequency model of the cuk converter with inductors and dc-isolation transformer integrated on one core is derived and published for the first time. Since the structure is a complex one attention is turned to the task of finding the simplest possible means for evaluating network functions. A generalized node-pair analysis is proposed. The factored design oriented form of the model enables optimization of the converter dynamics. Full supporting practical measurements are included.

	PSPICE SIMULATIONS AND 3D-PCB TRANSFORMERS FOR ZVS FULL BRIDGE CONVERTERS By A. Wyns; D. Bogaerts; J. L. Van Eck; P. Mathys	[View] [Download]
Abstract: This paper presents a compact 800 W ZVS full bridge converter (500 kHz) designed by using advanced simulation techniques on PSPICE and an innovative low-leakage toroidal power transformer. The use of SPICE models for power MOSFETs and power diodes has made it easier to design the fixed-frequency, quasi-resonant, phase-shift, full bridge topology finally selected. This new and very compact power supply uses a combination of advanced circuit design and technological breakthroughs. The use of SMDs and multi-layer ceramic capacitors reduces space and increases circuit reliability. The low-leakage toroidal transformer is realised by using a patented three-dimensional printed-circuit board technique which is revolutionary. The converter is currently in production.