高頻感應加熱系統之全橋相移換流電路設計

Design of Phase-Shifted Full Bridge Inverter for an High-Frequency Induction Heating System

本文旨在發展應用於感應加熱系統之相移全橋換流電路，本文所提電路使用串聯諧振配合負載線圈電壓、電流相位控制迴路，能在負載溫度控制過程，克服感應熱負載阻抗特性變化，達到換流電路零電壓切換，同時使得負載之工作溫度得穩定在設定值。本文除理論分析外，所提方法已於實驗室完成雛形電路進行驗證，由實驗證實雛形電路500W轉換效率93.4%、160℃溫度控制誤差4.3℃，相關實驗結果顯示所提方法在感應加熱系統之應用確具可行性與實用參考價值。

 

This paper aims to develop an inverter circuit for induction heating. The proposed phase-shifted full bridge inverter utilizes series resonance to provide zero-voltage switching (ZVS) for the switching devices. By studying the voltage and current of resonance circuit along with relationships between load impedance and frequency, the working frequency and resonant current phase in the circuit can be well controlled for ZVS. Moreover, the paper has developed the temperature control loop, where software simulations and experimental measurement are both made to evaluate. Results from simulations and hardware testing is compared with each other, thereby verifying the concepts introduced in this paper.