... Systems specifications (EHS). This SoC node, the EHS on a Chip (EHSoC), includes a 8051 micro... more ... Systems specifications (EHS). This SoC node, the EHS on a Chip (EHSoC), includes a 8051 microcontroller, Medium Access Controller (MAC) and a Modem circuit for the EHS Power Line medium specifications. The Power Line ...
Resumen— Los convertidores serie resonantes son ampliamente utilizados en aplicaciones de calenta... more Resumen— Los convertidores serie resonantes son ampliamente utilizados en aplicaciones de calentamiento por inducción doméstica, entre sus ventajas se encuentran su tamaño, eficiencia y densidad energética. Uno de los principales retos a los que se enfrenta el diseño del control de estas etapas es ser capaz de proporcionar con seguridad la potencia objetivo a una carga muy variable que depende de parámetros como la frecuencia de conmutación, la temperatura, el material del recipiente, la geometría del sistema, etc. En estas condiciones de trabajo es necesario determinar en cada instante la impedancia de la carga de inducción para poder ajustar el algoritmo de control. En este trabajo se estudian y comparan con medidas experimentales distintas estrategias de identificación publicadas con el objetivo de determinar la idoneidad de cada una de ellas en aplicaciones de inducción doméstica. Palabras clave— Inducción doméstica, etapas de potencia resonantes, identificación de la carga, mín...
2014 IEEE 15th Workshop on Control and Modeling for Power Electronics (COMPEL), 2014
ABSTRACT Resonant power converters are widely used in domestic induction heating (IH) cooktops du... more ABSTRACT Resonant power converters are widely used in domestic induction heating (IH) cooktops due to their advantages in terms of size, efficiency, and power density. The wide range of different induction loads (with different electrical equivalent) and the wide range of required output powers, lead to the load identification as a mandatory and specially challenging aspect. This identification is needed to improve static operation, by identifying IH load that may lead to too high currents through the inverter, and dynamic operation, by correcting the gain of the digital controller according to the identified IH load. This work focuses on applying and evaluating the Particle Swarm Optimization (PSO) algorithm to identify the system load in domestic induction heating. Therefore, the obtained load parameters lead to a more efficient control strategy of the delivered power according to the user requirements. Simulation and experimental results in an induction heating prototype are performed in order to validate the proposed identification algorithm.
This paper presents a reorganization of the pyramid algorithm to compute the discrete wavelet tra... more This paper presents a reorganization of the pyramid algorithm to compute the discrete wavelet transform in order to obtain an efficient hardware implementation. Locality is improved to get hardware efficiency. An overview of the architecture intended to this purpose is presented.
Mixed-simulation tools arise as efficient tools in the design flow of power converter controllers... more Mixed-simulation tools arise as efficient tools in the design flow of power converter controllers. Nowadays power converters are controlled by digital circuits modeled using hardware description languages. These models are validated by simulation and mixed signal simulators provide a way to simulate the system as a whole. In this work we present the use of these tools in the design
In this paper an analysis of the efficiency of round-wire planar inductors for domestic induction... more In this paper an analysis of the efficiency of round-wire planar inductors for domestic induction heating appliances is developed. This efficiency will be determined by the relationship between the losses in the windings and the power dissipated by eddy currents in the vessel. Therefore, it will depend on the geometry and properties of the vessel as well as winding parameters.
Digital controllers implemented in an FPGA for switching power converters are becoming an importa... more Digital controllers implemented in an FPGA for switching power converters are becoming an important alternative to the traditional analog solutions. Assuming that the digital controller is described using a hardware description language, this work gives an overview of models, and mixed-signal simulation alternatives that support the simulation as a whole of the digital controller with the power electronic circuit, in
Digital controllers implemented in an FPGA for switching power converters are becoming an importa... more Digital controllers implemented in an FPGA for switching power converters are becoming an important alternative to the traditional analog solutions. Assuming that the digital controller is described using a hardware description language (VHDL), the ADVance MS mixed-signal simulation tool is used to simulate in closed loop the digital controller in order to analyze the finite word-length effects. The use of
ABSTRACT This paper presents a method to measure off-line the frequency-to-output-power transfer ... more ABSTRACT This paper presents a method to measure off-line the frequency-to-output-power transfer function of a resonant inverter in open-loop. This method is applied to a half-bridge series resonant inverter for domestic induction heating applications. A sinusoidal perturbation is injected to the nominal value of the switching frequency, leading to a perturbation in the power transferred to the load. The Discrete Fourier Transform (DFT) is used off-line to process the digitized input and outputs in order to compute the gain and phase of the transfer function at the injected perturbation frequency. The digitized input is the saw-tooth waveform used in the trailing-edge modulator. This waveform is generated with a commercial function generator that allows modulating the frequency with an internal sine waveform. Since the internal modulation signal is not accessible, the sinusoidal switching frequency perturbation is off-line obtained by processing the ramp slope of the saw-tooth waveform. The digitized outputs are the inductor current and load voltage, which are processed to obtain the moving average output power. The algorithm accuracy is firstly evaluated in simulation, leading to an appropriate method to extract the ramp slope of the saw-tooth waveform. Finally, the proposed method is experimentally verified, evaluating the validity range of the EDF model extended for several harmonics applied to resonant power converters.
ABSTRACT This paper proposes a field-programmable-gate-array-based emulator of the series-resonan... more ABSTRACT This paper proposes a field-programmable-gate-array-based emulator of the series-resonant half-bridge inverter for measuring the inverter efficiency and detecting hard-switching conditions. The proposed emulator is able to compute the converter operating conditions and efficiency each mains half-cycle, providing useful information for the control unit. In addition, it is designed taking advantage of recent advances in high-level synthesis tools, which provides an optimized and straightforward implementation. The proposed emulator has been applied to an induction heating (IH) appliance as an example of efficient and environmentally friendly appliances with a major economic and social impact. The obtained results are compared with classical offline simulation and experimental measurements, proving that the proposed emulator achieves the required accuracy for the IH application. As a consequence, the proposed system can be used for improving the system safety and optimizing the converter efficiency and reliability.
2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2011
This paper presents a field programmable gate array (FPGA) implementation of a digital circuit th... more This paper presents a field programmable gate array (FPGA) implementation of a digital circuit that measures in real-time first harmonics of voltage and current medium-frequency (25 kHz - 70 kHz) induction-heating cooking appliances. The inverter output voltage and load current are sensed using first-order delta-sigma () analog to digital converters. The coefficients of the Discrete-Time Fourier Series (DTFS) of voltage
... Systems specifications (EHS). This SoC node, the EHS on a Chip (EHSoC), includes a 8051 micro... more ... Systems specifications (EHS). This SoC node, the EHS on a Chip (EHSoC), includes a 8051 microcontroller, Medium Access Controller (MAC) and a Modem circuit for the EHS Power Line medium specifications. The Power Line ...
Resumen— Los convertidores serie resonantes son ampliamente utilizados en aplicaciones de calenta... more Resumen— Los convertidores serie resonantes son ampliamente utilizados en aplicaciones de calentamiento por inducción doméstica, entre sus ventajas se encuentran su tamaño, eficiencia y densidad energética. Uno de los principales retos a los que se enfrenta el diseño del control de estas etapas es ser capaz de proporcionar con seguridad la potencia objetivo a una carga muy variable que depende de parámetros como la frecuencia de conmutación, la temperatura, el material del recipiente, la geometría del sistema, etc. En estas condiciones de trabajo es necesario determinar en cada instante la impedancia de la carga de inducción para poder ajustar el algoritmo de control. En este trabajo se estudian y comparan con medidas experimentales distintas estrategias de identificación publicadas con el objetivo de determinar la idoneidad de cada una de ellas en aplicaciones de inducción doméstica. Palabras clave— Inducción doméstica, etapas de potencia resonantes, identificación de la carga, mín...
2014 IEEE 15th Workshop on Control and Modeling for Power Electronics (COMPEL), 2014
ABSTRACT Resonant power converters are widely used in domestic induction heating (IH) cooktops du... more ABSTRACT Resonant power converters are widely used in domestic induction heating (IH) cooktops due to their advantages in terms of size, efficiency, and power density. The wide range of different induction loads (with different electrical equivalent) and the wide range of required output powers, lead to the load identification as a mandatory and specially challenging aspect. This identification is needed to improve static operation, by identifying IH load that may lead to too high currents through the inverter, and dynamic operation, by correcting the gain of the digital controller according to the identified IH load. This work focuses on applying and evaluating the Particle Swarm Optimization (PSO) algorithm to identify the system load in domestic induction heating. Therefore, the obtained load parameters lead to a more efficient control strategy of the delivered power according to the user requirements. Simulation and experimental results in an induction heating prototype are performed in order to validate the proposed identification algorithm.
This paper presents a reorganization of the pyramid algorithm to compute the discrete wavelet tra... more This paper presents a reorganization of the pyramid algorithm to compute the discrete wavelet transform in order to obtain an efficient hardware implementation. Locality is improved to get hardware efficiency. An overview of the architecture intended to this purpose is presented.
Mixed-simulation tools arise as efficient tools in the design flow of power converter controllers... more Mixed-simulation tools arise as efficient tools in the design flow of power converter controllers. Nowadays power converters are controlled by digital circuits modeled using hardware description languages. These models are validated by simulation and mixed signal simulators provide a way to simulate the system as a whole. In this work we present the use of these tools in the design
In this paper an analysis of the efficiency of round-wire planar inductors for domestic induction... more In this paper an analysis of the efficiency of round-wire planar inductors for domestic induction heating appliances is developed. This efficiency will be determined by the relationship between the losses in the windings and the power dissipated by eddy currents in the vessel. Therefore, it will depend on the geometry and properties of the vessel as well as winding parameters.
Digital controllers implemented in an FPGA for switching power converters are becoming an importa... more Digital controllers implemented in an FPGA for switching power converters are becoming an important alternative to the traditional analog solutions. Assuming that the digital controller is described using a hardware description language, this work gives an overview of models, and mixed-signal simulation alternatives that support the simulation as a whole of the digital controller with the power electronic circuit, in
Digital controllers implemented in an FPGA for switching power converters are becoming an importa... more Digital controllers implemented in an FPGA for switching power converters are becoming an important alternative to the traditional analog solutions. Assuming that the digital controller is described using a hardware description language (VHDL), the ADVance MS mixed-signal simulation tool is used to simulate in closed loop the digital controller in order to analyze the finite word-length effects. The use of
ABSTRACT This paper presents a method to measure off-line the frequency-to-output-power transfer ... more ABSTRACT This paper presents a method to measure off-line the frequency-to-output-power transfer function of a resonant inverter in open-loop. This method is applied to a half-bridge series resonant inverter for domestic induction heating applications. A sinusoidal perturbation is injected to the nominal value of the switching frequency, leading to a perturbation in the power transferred to the load. The Discrete Fourier Transform (DFT) is used off-line to process the digitized input and outputs in order to compute the gain and phase of the transfer function at the injected perturbation frequency. The digitized input is the saw-tooth waveform used in the trailing-edge modulator. This waveform is generated with a commercial function generator that allows modulating the frequency with an internal sine waveform. Since the internal modulation signal is not accessible, the sinusoidal switching frequency perturbation is off-line obtained by processing the ramp slope of the saw-tooth waveform. The digitized outputs are the inductor current and load voltage, which are processed to obtain the moving average output power. The algorithm accuracy is firstly evaluated in simulation, leading to an appropriate method to extract the ramp slope of the saw-tooth waveform. Finally, the proposed method is experimentally verified, evaluating the validity range of the EDF model extended for several harmonics applied to resonant power converters.
ABSTRACT This paper proposes a field-programmable-gate-array-based emulator of the series-resonan... more ABSTRACT This paper proposes a field-programmable-gate-array-based emulator of the series-resonant half-bridge inverter for measuring the inverter efficiency and detecting hard-switching conditions. The proposed emulator is able to compute the converter operating conditions and efficiency each mains half-cycle, providing useful information for the control unit. In addition, it is designed taking advantage of recent advances in high-level synthesis tools, which provides an optimized and straightforward implementation. The proposed emulator has been applied to an induction heating (IH) appliance as an example of efficient and environmentally friendly appliances with a major economic and social impact. The obtained results are compared with classical offline simulation and experimental measurements, proving that the proposed emulator achieves the required accuracy for the IH application. As a consequence, the proposed system can be used for improving the system safety and optimizing the converter efficiency and reliability.
2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2011
This paper presents a field programmable gate array (FPGA) implementation of a digital circuit th... more This paper presents a field programmable gate array (FPGA) implementation of a digital circuit that measures in real-time first harmonics of voltage and current medium-frequency (25 kHz - 70 kHz) induction-heating cooking appliances. The inverter output voltage and load current are sensed using first-order delta-sigma () analog to digital converters. The coefficients of the Discrete-Time Fourier Series (DTFS) of voltage
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Papers by Isidro Urriza