Abstract
An efficacious and reliable power control technique has been developed which can be used to regulate the output power of a high-frequency full bridge series resonant inverter (HF-FBSRI) in an induction heating (IH) system. In this paper, a modified buck-boost converter is presented to control the DC link/bus voltage which maintains the IH system under resonant mode and optimizes the performance of the IH system. Controlled DC link/bus voltage has been applied to this HF- FBSRI to control the average output power in the IH system. Using this aimed control technique, a wide range of output powers has been controlled and consistent performance of the IH system has been achieved. ZVS switching technique has been used to reduce the switching losses. Varying average power has been obtained at different duty cycles ranging from 0.2 to 0.8 with variable DC link voltage and it has been corroborated using PSIM environment for an IH system rated at 5500W.
Highlights
Today’s era reveals that the uses of induction heating (IH) technology are increasing in industrial and domestic applications [1]
Filter inductor (Lf) and capacitor (Cf) have been used for mitigating the ripple content in DC voltage. This pure DC supply has been applied to the modified buck-boost dc-dc converter which is used to regulate DC-link voltage (Vdcl). This variable DC–link voltage has been applied to a full bridge series resonant inverter (FBSRI) through a filter composed of Ls and Cs that eliminates high frequency components [4]
The electrical modeling of IH load can be explained with the help of a transformer equivalent circuit representation because IH system works on the principle of electromagnetic induction between the IH coil and the load [19,20]
Summary
Today’s era reveals that the uses of induction heating (IH) technology are increasing in industrial and domestic applications [1]. The performance of the IH system decreases and switching losses become more significant [12] It has been seen in frequency modulation technique that while varying frequency the current and power through resonant tank diminish. The main advantage of DC-link voltage control technique through a dcdc converter is that, it protects from the electromagnetic disruptions at the input side of the IH system This electromagnetic disruption is generated through a high frequency component (i.e. generated at the output side) which tries to superimpose on the input side. This proposed control technique can be applied in both industrial and domestic IH applications
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