Ignacio Millan

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Domestic induction cookers operation is based on a resonant inverter which supplies medium-frequency currents (20-100 kHz) to an inductor, which heats up the pan. The variable load that is inherent to this application requires the use of a reliable and load-adaptive control algorithm. In addition, a wide output power range is required to get a satisfactory(More)
This letter presents a powerful tool for the study of the performance of control strategies and consists of a versatile modulator capable of synthesizing triggering signals for various fixed-frequency and pulse width modulation controls based on a digital implementation. Among many other advantages, the approach provides a straightforward, flexible, and(More)
Integral expressions of the equivalent impedance of flat-type coils for induction heating systems are derived. These expressions are obtained by integration the analytical solution of the field generated by a circular filamentary current placed between two linear and homogeneous semi-infinite media. It is considered that the windings are wound with a round(More)
In this paper, a study of the Discontinuous current Mode (DM) control applied to a half-bridge series resonant inverter for domestic induction heating is presented. The proposed control is interesting for this application because it exhibits reduced switching losses and the output power control is linear with the switching frequency. Considering that the(More)
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(More)
This paper presents the challenges encountered and the solutions adopted during the construction of a versatile voltage-fed high-frequency series-resonant half-bridge inverter module. It is used in the large-signal power generator of an inductive load characterization test-bench operating from 1 kHz up to 1.5 MHz and up to 7-kW output power for a variety of(More)
Traditionally the domestic induction heating load has been electrically modelled by means of the series connection of an energetic equivalent resistance and inductance. Due to the nonlinear nature of the load and the excitation dependence of these equivalent parameters, which are only valid for a given waveform, there exists a strong lack of accuracy in(More)
Multiple-inductor systems are widely present in the current technology. These systems require controlling either the supplied voltage or power to several loads with different requirements simultaneously. As a consequence, the cost and size of the power stage may increase beyond the admissible limits for certain applications. Considering multiple-inductor(More)
Nowadays domestic induction cookers usually heat ferromagnetic pans. This technology is well known and it is successfully applied by many manufacturers. However, there are a number of non-ferromagnetic pans (made of aluminium, copper, copper-nickel, or stainless steel) that cannot be properly heated by this technology. In this paper, a modified half-bridge(More)
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 (T<inf>jmax</inf>) 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 T<inf>jmax</inf> of(More)