EPE Association: EPE 2007 - Subtopic 04-2 - DS: Soft switching converters: resonant, ZVS, ZCS

EPE 2007 - Subtopic 04-2 - DS: Soft switching converters: resonant, ZVS, ZCS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 04: 'Soft switching converters and control' > EPE 2007 - Subtopic 04-2 - DS: Soft switching converters: resonant, ZVS, ZCS

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   A method of power regulation applied to the high frequency inverter for the IH home appliances
By KIFUNE Hiroyasu; HATANAKA Yoshihiro [View]
[Download]

Abstract: This paper describes a power regulation concept; CFPDM (Commercial Frequency Pulse Density Modulation) of the high frequency inverter for induction heating home appliances. CFPDM is a new type of PDM and it is easy to put CFPDM into practical use for any circuit topologies without any additional switches and passive components. Conventional PDM (Pulse Density Modulation) enables the high frequency inverter to control the output power over a broad range and to realize high power conversion efficiency at the same time. However, the resonant frequency of non-smoothing filter is close to the duty frequency of PDM, which may cause other harmonic current problems. In CFPDM, the duty frequency is set to lower than the line frequency unlike PLL. Therefore CFPDM surpass the advantages of PDM and also avoids generating harmonic current. This paper shows the sample of CFPDM controller and the operation principle by using simulated results. A prototype soft switching SEPP high frequency inverter controlled by CFPDM has been tested. Some experimental results of it are shown finally.

   A review of current state-of-the-art piezoelectric transformer technology
By STONE Dave; FOSTER Martin; HORSLEY Edward [View]
[Download]

Abstract: To date, piezoelectric transformers (PTs) have been extensively commercialised in step-up applications, such as cold cathode fluorescent lamp backlighting for LCDs. As step-down PT technology matures, PT-based converters are set to replace conventional transformers and power converters in a wide variety of applications that require relatively low power levels, low cost, high efficiency, high power density, small size and weight, low EMI, and high reliability. This paper examines the various types of piezoelectric transformer and provides an overview of the materials technology, converter designs, and control methods involved with their use.

   A Soft-Switched Bi-Directional DC-DC Converter
By HAYES John; POWER Daithi; RYLKO Marek; EGAN Michael [View]
[Download]

Abstract: High-power, high-frequency and high density bi-directional dc-dc converters are increasingly required in industrial applications and in automotive hybrid-electric power systems. This paper presents detailed analysis and experimental results on a 100 kHz, soft-switched bi-directional dc-dc converter, a novel variation of the auto-transformer soft-switching cell. New closed-form expressions are presented for the average current gain of the converter, taking both the impact of the soft-switching network and the output current ripple into account. These expressions are validated by simulation and experimental results. The efficiency of a prototype converter is shown to be approximately 97\% over a wide load range for both buck and boost operating modes. The circuit modes and limitations are discussed. The paper presents a 1 kW experimental comparison between the soft-switched MOSFET based low-ripple converter, a hard-switched low-ripple IGBT converter and a high-ripple MOSFET converter.

   An Improved ZVT PWM Boost Rectifier with High Power Factor and Low Conduction Losses
By YAN Deng; GANG Yao; WUHUA Li; MINGYAO Ma; RUI Xie; XIANGNING He [View]
[Download]

Abstract: An improved ZVT PWM boost rectifier with high power factor and low conduction losses is proposed in this paper. Only one auxiliary switch is used in the active soft switching circuit and all semiconductors are under soft switching conditions. A prototype of boost converter rated at 1kW has been built to confirm the effective of the converter.

   Experimental Characterisation of High Efficiency Resonant Gate Driver Circuit
By BUSATTO Giovanni; IANNUZZO Francesco; FRATELLI Luigi; ABBATE Carmine [View]
[Download]

Abstract: In high frequency power conversion applications, the power driver losses can become relevant and consequently the converter efficiency be reduced. In the last years, several gate driver topologies have been proposed able to reduce these losses. In this paper a high frequency, high efficiency resonant MOSFET gate driver is extended to high frequency operation, constructed and characterised. The experimental results show an energy reduction up to 78\%, and suggest the possibility to increase the switching frequency until 2.6MHz. A detailed experimental characterisation and some theoretical considerations are reported.

   Full Bridge Phase-Shifted Soft Switching High-Frequency Inverter with Boost PFC Function for Induction Heating System
By EIJI Hiraki; MUTSUO Nakaoka; YUKI Kawaguchi; TOSHIHIKO Tanaka [View]
[Download]

Abstract: This paper is mainly concerned with a high frequency soft-switching PWM inverter suitable for consumer induction heating system. Proposed system is composed of soft switching chopper based voltage boost PFC input stage and phase shifted PWM controlled full bridge ZCZVS high frequency inverter stage. Its fundamentals of operating performances are illustrated and evaluated on the experimental results. Its effectiveness is substantially proved on the basis of the experimental results from a practical point of view.

   The Design Method of the Inverter for Heating Both a Ferromagnetic Metal and a Paramagnetic Metal
By OGAWA Nobuo; SHIMAOKA Yoshihiro; SATO Muneo; ITO Fumio; KUBOTA Sachio [View]
[Download]

Abstract: In case that a ferromagnetic metal is heated up more than Curie temperature, the metallic characteristics change from ferromagnetism to paramagnetism. In this paper, the design method of inverter which always performs a stable operation even if a ferromagnetic metal is transformed to paramagnetic metal is described. And the circuit characteristics of the proposed inverter are analyzed in detail and verified by simulation and experiment.

EPE 2007 - Subtopic 04-2 - DS: Soft switching converters: resonant, ZVS, ZCS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 04: 'Soft switching converters and control' > EPE 2007 - Subtopic 04-2 - DS: Soft switching converters: resonant, ZVS, ZCS
	[return to parent folder]

	A method of power regulation applied to the high frequency inverter for the IH home appliances By KIFUNE Hiroyasu; HATANAKA Yoshihiro	[View] [Download]
Abstract: This paper describes a power regulation concept; CFPDM (Commercial Frequency Pulse Density Modulation) of the high frequency inverter for induction heating home appliances. CFPDM is a new type of PDM and it is easy to put CFPDM into practical use for any circuit topologies without any additional switches and passive components. Conventional PDM (Pulse Density Modulation) enables the high frequency inverter to control the output power over a broad range and to realize high power conversion efficiency at the same time. However, the resonant frequency of non-smoothing filter is close to the duty frequency of PDM, which may cause other harmonic current problems. In CFPDM, the duty frequency is set to lower than the line frequency unlike PLL. Therefore CFPDM surpass the advantages of PDM and also avoids generating harmonic current. This paper shows the sample of CFPDM controller and the operation principle by using simulated results. A prototype soft switching SEPP high frequency inverter controlled by CFPDM has been tested. Some experimental results of it are shown finally.

	A review of current state-of-the-art piezoelectric transformer technology By STONE Dave; FOSTER Martin; HORSLEY Edward	[View] [Download]
Abstract: To date, piezoelectric transformers (PTs) have been extensively commercialised in step-up applications, such as cold cathode fluorescent lamp backlighting for LCDs. As step-down PT technology matures, PT-based converters are set to replace conventional transformers and power converters in a wide variety of applications that require relatively low power levels, low cost, high efficiency, high power density, small size and weight, low EMI, and high reliability. This paper examines the various types of piezoelectric transformer and provides an overview of the materials technology, converter designs, and control methods involved with their use.

	A Soft-Switched Bi-Directional DC-DC Converter By HAYES John; POWER Daithi; RYLKO Marek; EGAN Michael	[View] [Download]
Abstract: High-power, high-frequency and high density bi-directional dc-dc converters are increasingly required in industrial applications and in automotive hybrid-electric power systems. This paper presents detailed analysis and experimental results on a 100 kHz, soft-switched bi-directional dc-dc converter, a novel variation of the auto-transformer soft-switching cell. New closed-form expressions are presented for the average current gain of the converter, taking both the impact of the soft-switching network and the output current ripple into account. These expressions are validated by simulation and experimental results. The efficiency of a prototype converter is shown to be approximately 97\% over a wide load range for both buck and boost operating modes. The circuit modes and limitations are discussed. The paper presents a 1 kW experimental comparison between the soft-switched MOSFET based low-ripple converter, a hard-switched low-ripple IGBT converter and a high-ripple MOSFET converter.

	An Improved ZVT PWM Boost Rectifier with High Power Factor and Low Conduction Losses By YAN Deng; GANG Yao; WUHUA Li; MINGYAO Ma; RUI Xie; XIANGNING He	[View] [Download]
Abstract: An improved ZVT PWM boost rectifier with high power factor and low conduction losses is proposed in this paper. Only one auxiliary switch is used in the active soft switching circuit and all semiconductors are under soft switching conditions. A prototype of boost converter rated at 1kW has been built to confirm the effective of the converter.

	Experimental Characterisation of High Efficiency Resonant Gate Driver Circuit By BUSATTO Giovanni; IANNUZZO Francesco; FRATELLI Luigi; ABBATE Carmine	[View] [Download]
Abstract: In high frequency power conversion applications, the power driver losses can become relevant and consequently the converter efficiency be reduced. In the last years, several gate driver topologies have been proposed able to reduce these losses. In this paper a high frequency, high efficiency resonant MOSFET gate driver is extended to high frequency operation, constructed and characterised. The experimental results show an energy reduction up to 78\%, and suggest the possibility to increase the switching frequency until 2.6MHz. A detailed experimental characterisation and some theoretical considerations are reported.

	Full Bridge Phase-Shifted Soft Switching High-Frequency Inverter with Boost PFC Function for Induction Heating System By EIJI Hiraki; MUTSUO Nakaoka; YUKI Kawaguchi; TOSHIHIKO Tanaka	[View] [Download]
Abstract: This paper is mainly concerned with a high frequency soft-switching PWM inverter suitable for consumer induction heating system. Proposed system is composed of soft switching chopper based voltage boost PFC input stage and phase shifted PWM controlled full bridge ZCZVS high frequency inverter stage. Its fundamentals of operating performances are illustrated and evaluated on the experimental results. Its effectiveness is substantially proved on the basis of the experimental results from a practical point of view.

	The Design Method of the Inverter for Heating Both a Ferromagnetic Metal and a Paramagnetic Metal By OGAWA Nobuo; SHIMAOKA Yoshihiro; SATO Muneo; ITO Fumio; KUBOTA Sachio	[View] [Download]
Abstract: In case that a ferromagnetic metal is heated up more than Curie temperature, the metallic characteristics change from ferromagnetism to paramagnetism. In this paper, the design method of inverter which always performs a stable operation even if a ferromagnetic metal is transformed to paramagnetic metal is described. And the circuit characteristics of the proposed inverter are analyzed in detail and verified by simulation and experiment.