波谱学杂志
波譜學雜誌
파보학잡지
CHINESE JOURNAL OF MAGNETIC RESONANCE
2015年
1期
78-86
,共9页
倍频移相%梯度放大器%核磁共振成像%IGBT
倍頻移相%梯度放大器%覈磁共振成像%IGBT
배빈이상%제도방대기%핵자공진성상%IGBT
multi-frequency shift%gradient amplifier%magnetic resonance imaging%insulated-gate bipolar transistor
提出了一种基于倍频移相的梯度放大器控制技术,该系统利用PLL形成相位差通过 IGBT 全桥拓扑结构以及输出功率电感并联电流输出。通过输出端闭合反馈系统和各个桥臂的均流控制反馈,实现大功率、低纹波、低噪声的电流输出。将该控制方法用于自主研制开发的梯度放大器上进行实验验证,测试得到的电流精度、纹波、噪声均达到指标要求,结果证明该设计方案具有可行性。
提齣瞭一種基于倍頻移相的梯度放大器控製技術,該繫統利用PLL形成相位差通過 IGBT 全橋拓撲結構以及輸齣功率電感併聯電流輸齣。通過輸齣耑閉閤反饋繫統和各箇橋臂的均流控製反饋,實現大功率、低紋波、低譟聲的電流輸齣。將該控製方法用于自主研製開髮的梯度放大器上進行實驗驗證,測試得到的電流精度、紋波、譟聲均達到指標要求,結果證明該設計方案具有可行性。
제출료일충기우배빈이상적제도방대기공제기술,해계통이용PLL형성상위차통과 IGBT 전교탁복결구이급수출공솔전감병련전류수출。통과수출단폐합반궤계통화각개교비적균류공제반궤,실현대공솔、저문파、저조성적전류수출。장해공제방법용우자주연제개발적제도방대기상진행실험험증,측시득도적전류정도、문파、조성균체도지표요구,결과증명해설계방안구유가행성。
Based on multi-frequency shift, a novel technology was proposed for controlling gradient amplifier in magnetic resonance imaging. Phase-locked-loop (PLL) circuit was used to achieve phase shift, and insulated-gate bipolar transistor (IGBT) full-bridge to achieve parallel output current and output power inductor. An output negative feedback system and average current control on every bridge were used to achieve high power, low ripple and low noise current output for the amplifier. The technology was validated on a custom-made gradient amplifier.