ISI222 根據(jù)電機驅動算法，電機相位可能需要在某種狀態(tài)（例如高壓輸出或低壓輸出）中停留相對較長的時間。特別是，某些空間矢量調制方案可能導致電機相位在幾毫秒或更長時間內切換為高電平。偏置驅動器的某些方法（如自舉）與這些調制方案不兼容。

ISI222電壓調節(jié)是隔離式電壓轉換器要求較低的性能標準之一。在大約 3：5 的負載電流范圍內，柵極驅動器的輸出電壓保持在 ±10% 至 ±1% 以內，而該范圍精度相對較低。Σ-Δ調制器的5 V輸出需要±1%的電壓調節(jié)，可通過低壓差（LDO）穩(wěn)壓器（如ADP7118、ADP7102或ADP7104）提供。

產生偏置電壓的方法

電阻源電荷泵是產生以電機相位為基準的偏置電壓的較便宜的方法之一。在圖3的示例中，電荷泵產生單個正電源軌。這在基本電機驅動器中可能就足夠了;然而，它的耗散操作使其效率非常低。在需要更多電源軌或更高電流的情況下，損耗變得不可接受。

ISI222 

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