高週波感應加熱是利用電磁感應方式，對金屬做加熱處理。惟目前市面上之商用高週波系統可加熱頻寬通常不大，一般機種約介於30 ~100 kHz之間，且無法精確定頻，也不能調控頻率。如果為了使高週波系統頻寬增大而更換高週波內部的諧振電容與加熱線圈，工作的諧振頻率點將隨之而改變。由於大電力系統線路複雜會產生寄生電感及電容，在此情況下將無法預知正確的諧振頻率點，必須利用高頻往低頻掃描的方式，找到高週波在輸出不同電流下的頻率，稱為自動頻率追蹤的方式，以避免電路操作在諧振點或電容性負載造成危險。本論文探討使用微控制器晶片控制15 kW高週波之輸出電流，並實際整合測試自動頻率追蹤機制。

High-frequency induction heating employed electromagnetic induction to heat the metal. However, the bandwidth that can be used for heating is not sufficiently wide for current commercial high-frequency induction heating machine. In general, their bandwidth is approximately 30~100 kHz and they are neither capable of setting the frequency accurately nor controlling the frequency. If the capacitors and the heating coil are replaced to expand the bandwidth of the high-frequency system, the operating resonant frequency changes as well. Because of the parasitic inductance and capacitance introduced by the complex circuit of the power system, the exact resonant frequency could not be predicted. The high-frequency band should be scanned from high to low, to obtain the frequency corresponding to the different output current, which is named Automatic Frequency Tracking. This should be done as a preventive measure against the danger caused by the circuit operating at the resonant point and the capacitive load. This thesis investigates use of microcontroller chips to control the output current of a 15 KW high-frequency system, and integrates and experiments with the automatic frequency tracking mechanism.

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