EPE Association: EPE 1993 - 46 - Dialogue Session DS3.4: POWER SUPPLIES: RESONANT CONVERTERS

EPE 1993 - 46 - Dialogue Session DS3.4: POWER SUPPLIES: RESONANT CONVERTERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1993 - Conference > EPE 1993 - 46 - Dialogue Session DS3.4: POWER SUPPLIES: RESONANT CONVERTERS

   [return to parent folder]

   NEW SHOOT-THROUGH POLE RESONANT LINK INVERTER WITH LOW VOLTAGE STRESS
By Y. C. Jung; G. H. Cho [View]
[Download]

Abstract: A new soft-switching resonant dc-link inverter is proposed to obtain high frequency switching with low loss and low voltage stress. In the proposed circuit, inverter poles are also utilized for the soft commutation and only one switch is additionally added. The proposed inverter has simple structure and flexible PWM capability due to the convenient choices of switching conditions. Based on the operational principle, analyses and design procedures are described.

   ANALYSIS OF A RESONANT CONVERTER WITH LCL-TYPE COMMUTATION
By Kh. Louati; D. Sadarnac [View]
[Download]

Abstract: In this paper, a converter is derived by adding an inductor in series with the ac-load of the conventional parallel resonant converter (PRC), which is called LCL resonant converter (LCL-RC). It is shown that this converter has more desirable features than the convenional PRC, such as the high dynamic control characteristics and the reduced component stresses. A steady state analysis gave a set of characteristic curves which allowed a systematic design procedure for this converter in the zero-voltage-switching region. Experimental results of prototype of a 150 watt-20 KHz full bridge LCL-RC are also presented.

   A MULTIPHASE SERIES-RESONANT CONVERTER WITH A REDUCED NUMBER OF THYRISTORS AND COMMON GROUNDS FOR INPUTS AND OUTPUTS
By H. Huisman [View]
[Download]

Abstract: Multiphase series-resonant (SR) power converters provide a flexible way to transform power between a utility grid and a multiphase load or source. The current implementations all suffer from a high component count, which makes the use of these converters unattractive from an economical point of view. A new topology for multiphase SR converters has been proposed in [1] in a simulation context. This topology uses half the number of power semiconductors compared to the existing multiphase SR converters. The present paper addresses the implementation of the new topology in a prototype converter. Simulation data and measured waveforms are shown, and a comparison is made between the new and the existing topologies. It is shown that the economical gain due to the reduction in component count is offset by a lower power rating.

   Multi-Resonant Soft-Switching PWM DC-DC High-Power Converter with Quasi Resonant-Poles and Resonant AC Tank using interal Parasitic Circuit Components....
By Y. J. Kim; M. Michihira; M. Nakaoka [View]
[Download]

Abstract: This paper deals with a fixed frequency phased-shifted PWM multi-resonant (MR) inverter type DC-DC high-power converter with two HFHV transformers-coupled stage, which operates under ZVS transition principle in spite of a wide PWM-based voltage regulation processing and largely-changed load conditions. This MR converter topology is composed of series capacitor-connected parallel resonant tank which makes the most of parasitic circuit components of two HV transformers, and two additional quasi-resonant pole circuits incorporated into the bridge. The soft-switching operation and practical efficacy of this new converter circuit using the latest IGBTs are actually ascertained through 50KW-120KV trially-produced converter system operating using 20KHz/30KHz HV-transformers which is applied for driving diagnostic HV X-ray tube load in medical equipments. It is proved from a practical point of view that the switching losses of lGBTs and their electrical dynamic stresses relating to EMI noise can be considerably reduced under a HF switching-based upon which is phase-shift PWM control process for a wide load setting requirements.

   A NATURALLY COMMUTATED RESONANT CIRCUIT FOR SOFT-SWITCHED INVERTERS
By J. Zhang; S. Y. R. Hui [View]
[Download]

Abstract: This paper presents a soft-switched inverter with zero-voltage switching capability aided by a simple quasi-resonant circuit. The quasi-resonant circuit creates zero-voltage instants so that standard voltage-fed inverter can be switched at high frequency without switching loss. Unlike the resonant-link inverter which sets link voltage higher than the input dc voltage, the link voltage in the proposed scheme remains at 1 per unit. Due to the resonant nature of the circuit, the thyristor can be turned off naturally without the need of commutation circuits. The major advantages of the proposed circuit include low-cost and simplicity. The operating principle of the circuit is explained and the operation of the circuit has been verified by SPICE simulation.

   NEW MULTI-RESONANT INDUCTION HEATING HIGH-FREQUENCY INVERTER WITH VOLTAGE-CLAMPED ZERO CURRENT SWITCHING USING NEWLY DEVELOPED BIPOLAR MODE STATIC INDUCTION...
By H. Ogiwara; M. Hayakawa; M. Nakaoka [View]
[Download]

Abstract: This paper is mainly concerned with the voltage-fed voltage-clamped type half-bridge topology of new instantaneous resonant current vector-regulated high-frequency inverter which efficiently operates at zero-current soft-switched quasi-resonant and load resonant tank circuit sub-resonant hybrid soft-switching schemes. This proposed multi-resonant inverter version using newly-developed high-frequency high-power normally-off type Bipolar Mode Static Induction Transistors (B-SIT) is more suitable for modern induction-heating and -melting power supply in industrial production plants. lts new conceptional operating principle is basically presented including control strategy and its remarkable features are discussed. lts analytical results and performance evaluations are described through computer-aided simulating methods. A feasible breadboard of trially-produced inverter treated here is originally demonstrated for the state-of- the-art induction heating power supply and is examined in experiment from a practical point of view.

   QUASI-RESONANT PARALLEL DC LINK CIRCUIT FOR HIGH-FREQUENCY DC-AC INVERTERS
By A. Sikorski; T. Citko [View]
[Download]

Abstract: The new simple configuration of the quasi-resonant circuit used to switching of the inverters' transistors with minimal power losses is presented. This circuit operates only at the moments of the transistors' commutation. The additional input capacitor and suitable simple method of the system control enables the bidirectional power flow and limits the overvoltage to the level 1,2 + 1,3 of source voltage. The theoretical study of the process of transistors' commutation in different possible conditions of work confirmed by laboratory investigations is the main subject of this article.

   INDUSTRIAL APPLICATION, 1MHz, QUASI RESONANT CONVERTER
By J. M. Carrasco; F. P. Ridao; J. M. Quero; C. Janer; L. G. Franquelo [View]
[Download]

Abstract: An industrial multi-output QRC converter is presented. lts main designing constraints are low cost, small in size, reduced EMI and EMC, high efficiency and severe dynamic behaviour in all outputs. Accomplishing this last restriction proved to be a difficult task. This has been done by means of a classical controller and cross regulation. The actual performance was tested on a 1MHz prototype rated at 50W. The low cost developed converter is characterized by its simplicity of design and operation, yet is versatile in performance. Actual experimental results are presented.

   A NOVEL SERIES-RESONANT DC/DC CONVERTER WITH FULL CONTROL OF OUTPUT VOLTAGE
By A. Dmowski; R. Bugyi; P. Szewczyk [View]
[Download]

Abstract: The series resonant DC/DC converter is one of the most promising soft-switching topologies with potential to replace PWM converters in medium to high power DC applications. However, the SRC lacks of output voltage regulation at no-load. This paper presents a novel SRC with added resonant boost stage assuring full control over the output voltage. A performance comparison of the new converter and a conventional half-wave resonant converter is presented. A computer program allowing design of SRC and above-resonance similarity protection circuit are also presented and discussed.

EPE 1993 - 46 - Dialogue Session DS3.4: POWER SUPPLIES: RESONANT CONVERTERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1993 - Conference > EPE 1993 - 46 - Dialogue Session DS3.4: POWER SUPPLIES: RESONANT CONVERTERS
	[return to parent folder]

	NEW SHOOT-THROUGH POLE RESONANT LINK INVERTER WITH LOW VOLTAGE STRESS By Y. C. Jung; G. H. Cho	[View] [Download]
Abstract: A new soft-switching resonant dc-link inverter is proposed to obtain high frequency switching with low loss and low voltage stress. In the proposed circuit, inverter poles are also utilized for the soft commutation and only one switch is additionally added. The proposed inverter has simple structure and flexible PWM capability due to the convenient choices of switching conditions. Based on the operational principle, analyses and design procedures are described.

	ANALYSIS OF A RESONANT CONVERTER WITH LCL-TYPE COMMUTATION By Kh. Louati; D. Sadarnac	[View] [Download]
Abstract: In this paper, a converter is derived by adding an inductor in series with the ac-load of the conventional parallel resonant converter (PRC), which is called LCL resonant converter (LCL-RC). It is shown that this converter has more desirable features than the convenional PRC, such as the high dynamic control characteristics and the reduced component stresses. A steady state analysis gave a set of characteristic curves which allowed a systematic design procedure for this converter in the zero-voltage-switching region. Experimental results of prototype of a 150 watt-20 KHz full bridge LCL-RC are also presented.

	A MULTIPHASE SERIES-RESONANT CONVERTER WITH A REDUCED NUMBER OF THYRISTORS AND COMMON GROUNDS FOR INPUTS AND OUTPUTS By H. Huisman	[View] [Download]
Abstract: Multiphase series-resonant (SR) power converters provide a flexible way to transform power between a utility grid and a multiphase load or source. The current implementations all suffer from a high component count, which makes the use of these converters unattractive from an economical point of view. A new topology for multiphase SR converters has been proposed in [1] in a simulation context. This topology uses half the number of power semiconductors compared to the existing multiphase SR converters. The present paper addresses the implementation of the new topology in a prototype converter. Simulation data and measured waveforms are shown, and a comparison is made between the new and the existing topologies. It is shown that the economical gain due to the reduction in component count is offset by a lower power rating.

	Multi-Resonant Soft-Switching PWM DC-DC High-Power Converter with Quasi Resonant-Poles and Resonant AC Tank using interal Parasitic Circuit Components.... By Y. J. Kim; M. Michihira; M. Nakaoka	[View] [Download]
Abstract: This paper deals with a fixed frequency phased-shifted PWM multi-resonant (MR) inverter type DC-DC high-power converter with two HFHV transformers-coupled stage, which operates under ZVS transition principle in spite of a wide PWM-based voltage regulation processing and largely-changed load conditions. This MR converter topology is composed of series capacitor-connected parallel resonant tank which makes the most of parasitic circuit components of two HV transformers, and two additional quasi-resonant pole circuits incorporated into the bridge. The soft-switching operation and practical efficacy of this new converter circuit using the latest IGBTs are actually ascertained through 50KW-120KV trially-produced converter system operating using 20KHz/30KHz HV-transformers which is applied for driving diagnostic HV X-ray tube load in medical equipments. It is proved from a practical point of view that the switching losses of lGBTs and their electrical dynamic stresses relating to EMI noise can be considerably reduced under a HF switching-based upon which is phase-shift PWM control process for a wide load setting requirements.

	A NATURALLY COMMUTATED RESONANT CIRCUIT FOR SOFT-SWITCHED INVERTERS By J. Zhang; S. Y. R. Hui	[View] [Download]
Abstract: This paper presents a soft-switched inverter with zero-voltage switching capability aided by a simple quasi-resonant circuit. The quasi-resonant circuit creates zero-voltage instants so that standard voltage-fed inverter can be switched at high frequency without switching loss. Unlike the resonant-link inverter which sets link voltage higher than the input dc voltage, the link voltage in the proposed scheme remains at 1 per unit. Due to the resonant nature of the circuit, the thyristor can be turned off naturally without the need of commutation circuits. The major advantages of the proposed circuit include low-cost and simplicity. The operating principle of the circuit is explained and the operation of the circuit has been verified by SPICE simulation.

	NEW MULTI-RESONANT INDUCTION HEATING HIGH-FREQUENCY INVERTER WITH VOLTAGE-CLAMPED ZERO CURRENT SWITCHING USING NEWLY DEVELOPED BIPOLAR MODE STATIC INDUCTION... By H. Ogiwara; M. Hayakawa; M. Nakaoka	[View] [Download]
Abstract: This paper is mainly concerned with the voltage-fed voltage-clamped type half-bridge topology of new instantaneous resonant current vector-regulated high-frequency inverter which efficiently operates at zero-current soft-switched quasi-resonant and load resonant tank circuit sub-resonant hybrid soft-switching schemes. This proposed multi-resonant inverter version using newly-developed high-frequency high-power normally-off type Bipolar Mode Static Induction Transistors (B-SIT) is more suitable for modern induction-heating and -melting power supply in industrial production plants. lts new conceptional operating principle is basically presented including control strategy and its remarkable features are discussed. lts analytical results and performance evaluations are described through computer-aided simulating methods. A feasible breadboard of trially-produced inverter treated here is originally demonstrated for the state-of- the-art induction heating power supply and is examined in experiment from a practical point of view.

	QUASI-RESONANT PARALLEL DC LINK CIRCUIT FOR HIGH-FREQUENCY DC-AC INVERTERS By A. Sikorski; T. Citko	[View] [Download]
Abstract: The new simple configuration of the quasi-resonant circuit used to switching of the inverters' transistors with minimal power losses is presented. This circuit operates only at the moments of the transistors' commutation. The additional input capacitor and suitable simple method of the system control enables the bidirectional power flow and limits the overvoltage to the level 1,2 + 1,3 of source voltage. The theoretical study of the process of transistors' commutation in different possible conditions of work confirmed by laboratory investigations is the main subject of this article.

	INDUSTRIAL APPLICATION, 1MHz, QUASI RESONANT CONVERTER By J. M. Carrasco; F. P. Ridao; J. M. Quero; C. Janer; L. G. Franquelo	[View] [Download]
Abstract: An industrial multi-output QRC converter is presented. lts main designing constraints are low cost, small in size, reduced EMI and EMC, high efficiency and severe dynamic behaviour in all outputs. Accomplishing this last restriction proved to be a difficult task. This has been done by means of a classical controller and cross regulation. The actual performance was tested on a 1MHz prototype rated at 50W. The low cost developed converter is characterized by its simplicity of design and operation, yet is versatile in performance. Actual experimental results are presented.

	A NOVEL SERIES-RESONANT DC/DC CONVERTER WITH FULL CONTROL OF OUTPUT VOLTAGE By A. Dmowski; R. Bugyi; P. Szewczyk	[View] [Download]
Abstract: The series resonant DC/DC converter is one of the most promising soft-switching topologies with potential to replace PWM converters in medium to high power DC applications. However, the SRC lacks of output voltage regulation at no-load. This paper presents a novel SRC with added resonant boost stage assuring full control over the output voltage. A performance comparison of the new converter and a conventional half-wave resonant converter is presented. A computer program allowing design of SRC and above-resonance similarity protection circuit are also presented and discussed.