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http://dx.doi.org/10.6113/TKPE.2018.23.3.225

Harmonic Suppression of the Input Current in Microwave Oven Using LLC Resonant Inverter  

Kang, Kyelyong (H&A Control R&D Lab., LG Electronics Inc.)
Kim, Heung-Geun (Dept. of Electrical Eng., Kyungpook National University)
Cha, Honnyong (School of Energy Eng., Kyungpook National University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.23, no.3, 2018 , pp. 225-230 More about this Journal
Abstract
This paper proposes a parametric design of an LLC resonant inverter used for a microwave oven. To improve the harmonic performance of the microwave oven, a current controller with a variable PI gain is proposed. Due to the recent strengthening of harmonics regulations, inverter control technology for microwave ovens is now required to satisfy harmonic performance. In an LLC resonant inverter, the voltage gain varies remarkably depending on the magnetron voltage, output power, and input voltage. To satisfy harmonic performance, a controller that can maintain operation in the zero-voltage switching (ZVS) region and control changes in voltage gain is required. The modified design of the LLC resonant inverter ensures ZVS operation even when the magnetron is heated. Application of the variable current controller improves harmonic control according to the instantaneous gain curve change. The validity of the proposed power control with a variable current controller is verified by experiments with a 1200 W microwave oven.
Keywords
HFT(High Frequency Transformer); Magnetron; LLC resonant inverter; Variable current controller;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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