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access icon free Phase-shift modulation in double half-bridge inverter with common resonant capacitor for induction heating appliances

© The Institution of Engineering and Technology
Received 25/03/2014, Accepted 11/01/2015, Revised 30/09/2014, Published 08/04/2015

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.

Inspec keywords: power capacitors; invertors; domestic appliances; power control; induction heating

Other keywords: equivalent impedances; inductive loads; double half-bridge inverter; common resonant capacitor; switching frequency; domestic induction heating appliances; converter; phase-shift modulation; inductor-pot systems; output power control; duty cycle

Subjects: DC-AC power convertors (invertors); Domestic appliances; Other power apparatus and electric machines; Power and energy control; Control of electric power systems; Process heating

References

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