The Resonant Half-Bridge inverter (11b) is the most
employed topology in induction cookers for multiple burner,
high-power systems due to its simplicity, its
cost-effectiveness, and the electrical requirements of its
components. These are commonly found in European
markets. The equivalent load is basically the resonant tank,
which consists of the inductive coil, the resonant capacitors
and the equivalent resistance of the pan.
Induction-coil-and-pan coupling it can be modeled as
a series connection of an inductor and a resistor, based on
the analogy of a transformer, and it is defined by the values
of Lr and Rload. These values change mainly with switching
frequency applied to the switches, pan material,
temperature, and inductor-pan coupling. The resonant
half-bridge belongs to the resonant converter family. It is
similar to a standard half-bridge, where the capacity of
the bus (the resonant capacitors) is set in accordance with
the coil for resonating at a certain frequency (the so called
resonant frequency). The power stage is composed of two
switches with antiparallel diodes, two capacitors and a coil.
The circuit can be simplified for calculations as it is in
Figure 12, where the two capacitor result in parallel in