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A new oven detection algorithm and control of IH-Jar achieved by DSP control

This paper suggests a new method for oven detection in those induction heating rice cooker (IH-Jar) circuits that are controlled by DSP. The designed control method calculates oven detection levels based on changes in input currents during oven detection time and averages the input voltages, input currents and outputs during oven detection time thereby enhancing the reliability of oven detection. This new method allows more stable oven detection under the dip or distortion of commercial power supply that may occur in actual field, particularly, in circuits with no separate power factor circuit. The topology of the circuits used in this paper is Quasi-Resonant ZVS-PFM Single-ended.