ISI222 根據(jù)電機(jī)驅(qū)動(dòng)算法，電機(jī)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(duì)較長(zhǎng)的時(shí)間。特別是，某些空間矢量調(diào)制方案可能導(dǎo)致電機(jī)相位在幾毫秒或更長(zhǎng)時(shí)間內(nèi)切換為高電平。偏置驅(qū)動(dòng)器的某些方法（如自舉）與這些調(diào)制方案不兼容。

ISI222電壓調(diào)節(jié)是隔離式電壓轉(zhuǎn)換器要求較低的性能標(biāo)準(zhǔn)之一。在大約 3：5 的負(fù)載電流范圍內(nèi)，柵極驅(qū)動(dòng)器的輸出電壓保持在 ±10% 至 ±1% 以?xún)?nèi)，而該范圍精度相對(duì)較低。Σ-Δ調(diào)制器的5 V輸出需要±1%的電壓調(diào)節(jié)，可通過(guò)低壓差（LDO）穩(wěn)壓器（如ADP7118、ADP7102或ADP7104）提供。

產(chǎn)生偏置電壓的方法

電阻源電荷泵是產(chǎn)生以電機(jī)相位為基準(zhǔn)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(chǎn)生單個(gè)正電源軌。這在基本電機(jī)驅(qū)動(dòng)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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