EPE Association: EPE 2009 - Subtopic 04-2 - LS: 'Soft Switch Converters (Inductive Heating)'

EPE 2009 - Subtopic 04-2 - LS: 'Soft Switch Converters (Inductive Heating)'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 04: 'Soft Switch Converters' > EPE 2009 - Subtopic 04-2 - LS: 'Soft Switch Converters (Inductive Heating)'

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   A three-phase to single-phase matrix converter for high-frequency induction heating
By Nam NGUYEN-QUANG, David STONE, Chris BINGHAM, Martin FOSTER [View]
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Abstract: The paper describes a new three-phase to single-phase matrix converter featuring unity input power factor, very low input total harmonic distortion, and soft-switching over the full power range, for high frequency induction heating applications. A variable output pulse density modulation scheme has been proposed for stable operation of the converter, with the notable feature of requiring no on-line calculations for the synthesis of three-phase input current system. Practical issues in realising the converter, viz. line frequency synchronisation and output current circulation, are described. Good agreement between simulation and experimental results confirm the benefits of the proposed converter.

   Efficiency Optimization of Half-Bridge Series Resonant Inverter with Asymmetrical Duty Cycle Control for Domestic Induction Heating
By Oscar LUCIA, Ignacio MILLAN, Jose Miguel BURDIO, Jesus ACERO, Sergio LLORENTE [View]
[Download]

Abstract: In this paper, a method to improve efficiency in half-bridge series resonant inverter applied to domestic induction heating is presented. Low and medium output powers required for this application implies the use of higher switching frequencies, which leads to an efficiency decrease. Asymmetrical duty cycle (ADC) modulation scheme is proposed to improve efficiency due to its switching frequency reduction and absence of additional hardware requirements. Study methodology comprises, in a first step, a theoretical analysis of power balance as a function of control parameters: duty cycle and switching frequency. In addition, restrictions due to snubber and dead time, and variability of the induction loads have been considered. Afterwards, an efficiency analysis has been carried out to determine the optimum operation point. Switching and conduction losses have been calculated to examine global importance of each one for different switching devices. ADC modulation efficiency improvement is achieved by means of a switching frequency reduction, mainly at low-medium power range and low quality factor (Q) loads. The analytical results obtained with this study have been validated through an induction heating test-bench. A discrete 3-kW RL load has been designed to emulate a typical induction heating load. Then, a commercial induction heating inverter is used to evaluate ADC modulation scheme

   IGBT Selection Method for the Design of Resonant Inverters for Domestic Induction Heating
By Ignacio MILLAN, Diego PUYAL, JosÃ© Miguel BURDIO, Oscar LUCIA, Daniel PALACIOS [View]
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Abstract: The power transistor (IGBT) is one of the most important components of the inverter of domestic induction cookers. For this application the maximum junction temperature (Tjmax) of the IGBT is one of the most critical design parameters because the cooker has to decrease the output power when the junction temperature is near to Tjmax of the device. The junction temperature (Tj) of the IGBT principally depends on the power losses. This paper proposes a method to choose the IGBT based on the calculation of the temperature variation ΔTja from the power losses. Nowadays, IGBT behaviour is a trade-off between conduction and switching performance, so it is necessary to measure the IGBT power losses separately. This paper proposes a method to measure the power losses separately based on electrical measurement and the IGBT conduction characteristics. Moreover it is proposed a criterion to determinate the limits of the power losses based on eliminate the offset of device voltage and the switching area is defined from the voltage is over 2.5 V to the current is zero. Finally, the proposed method has been applied to five different IGBTs for different levels of power and with two standard pans with an electronic board of a commercial cooker Moreover this method has been verified with a thermografic camera obtaining similar results.

EPE 2009 - Subtopic 04-2 - LS: 'Soft Switch Converters (Inductive Heating)'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 04: 'Soft Switch Converters' > EPE 2009 - Subtopic 04-2 - LS: 'Soft Switch Converters (Inductive Heating)'
	[return to parent folder]

	A three-phase to single-phase matrix converter for high-frequency induction heating By Nam NGUYEN-QUANG, David STONE, Chris BINGHAM, Martin FOSTER	[View] [Download]
Abstract: The paper describes a new three-phase to single-phase matrix converter featuring unity input power factor, very low input total harmonic distortion, and soft-switching over the full power range, for high frequency induction heating applications. A variable output pulse density modulation scheme has been proposed for stable operation of the converter, with the notable feature of requiring no on-line calculations for the synthesis of three-phase input current system. Practical issues in realising the converter, viz. line frequency synchronisation and output current circulation, are described. Good agreement between simulation and experimental results confirm the benefits of the proposed converter.

	Efficiency Optimization of Half-Bridge Series Resonant Inverter with Asymmetrical Duty Cycle Control for Domestic Induction Heating By Oscar LUCIA, Ignacio MILLAN, Jose Miguel BURDIO, Jesus ACERO, Sergio LLORENTE	[View] [Download]
Abstract: In this paper, a method to improve efficiency in half-bridge series resonant inverter applied to domestic induction heating is presented. Low and medium output powers required for this application implies the use of higher switching frequencies, which leads to an efficiency decrease. Asymmetrical duty cycle (ADC) modulation scheme is proposed to improve efficiency due to its switching frequency reduction and absence of additional hardware requirements. Study methodology comprises, in a first step, a theoretical analysis of power balance as a function of control parameters: duty cycle and switching frequency. In addition, restrictions due to snubber and dead time, and variability of the induction loads have been considered. Afterwards, an efficiency analysis has been carried out to determine the optimum operation point. Switching and conduction losses have been calculated to examine global importance of each one for different switching devices. ADC modulation efficiency improvement is achieved by means of a switching frequency reduction, mainly at low-medium power range and low quality factor (Q) loads. The analytical results obtained with this study have been validated through an induction heating test-bench. A discrete 3-kW RL load has been designed to emulate a typical induction heating load. Then, a commercial induction heating inverter is used to evaluate ADC modulation scheme

	IGBT Selection Method for the Design of Resonant Inverters for Domestic Induction Heating By Ignacio MILLAN, Diego PUYAL, JosÃ© Miguel BURDIO, Oscar LUCIA, Daniel PALACIOS	[View] [Download]
Abstract: The power transistor (IGBT) is one of the most important components of the inverter of domestic induction cookers. For this application the maximum junction temperature (Tjmax) of the IGBT is one of the most critical design parameters because the cooker has to decrease the output power when the junction temperature is near to Tjmax of the device. The junction temperature (Tj) of the IGBT principally depends on the power losses. This paper proposes a method to choose the IGBT based on the calculation of the temperature variation ΔTja from the power losses. Nowadays, IGBT behaviour is a trade-off between conduction and switching performance, so it is necessary to measure the IGBT power losses separately. This paper proposes a method to measure the power losses separately based on electrical measurement and the IGBT conduction characteristics. Moreover it is proposed a criterion to determinate the limits of the power losses based on eliminate the offset of device voltage and the switching area is defined from the voltage is over 2.5 V to the current is zero. Finally, the proposed method has been applied to five different IGBTs for different levels of power and with two standard pans with an electronic board of a commercial cooker Moreover this method has been verified with a thermografic camera obtaining similar results.