Open AccessPhase‐shift modulation in double half‐bridge inverter with common resonant capacitor for induction heating appliances
Author(s) -
Carretero Claudio,
Lucia Oscar,
Acero Jesus,
Burdio Jose Miguel
Publication year - 2015
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2014.0229
Subject(s) - induction heating , inverter , resonant inverter , inductor , duty cycle , equivalent impedance transforms , capacitor , modulation (music) , control theory (sociology) , harmonic , power (physics) , electrical impedance , three phase , engineering , electrical engineering , voltage , computer science , physics , control (management) , acoustics , electromagnetic coil , quantum mechanics , artificial intelligence
In this study, the application of the phase‐shift modulation to a double half‐bridge resonant inverter supplying inductive loads with a common resonant capacitor is analysed in order to control the output power provided to the load of each converter. This study is focused on the application of such modulation to a cost‐effective solution for domestic induction heating appliances with at least two burners heating up simultaneously two pots. The burners, also called inductor–pot systems, are usually electrically modelled by their equivalent impedances, Z coil ( ω ). The proposed modulation is suitable to control the power provided to inductor–pot systems with different equivalent impedances. The control variables of each half‐bridge inverter, that is, switching frequency, f sw o , and duty cycle, D , have been assumed identical to both inverters in order to simplify the analysis, but, a new control parameter, the phase‐shift between inverters, φ , is employed. In the analysis, it has been proved that the power dependence with respect to the phase‐shift between the inverter is almost totally due to the first harmonic contribution of the current. Finally, the main results of the analysis are checked by means of experimental measurements.