A16B-1212-0100另一個(gè)解決方案是利用低壓組件進(jìn)行電源測(cè)量。在這一特定的情況下,我們所提及的組件都是使用低成本的5 V單電源進(jìn)行模擬測(cè)量。圖3示出了使用這些低成本、低電壓組件的建議解決方案。來(lái)自隔離變壓器的±10 V信號(hào)直接傳輸至差動(dòng)放大器(例如TI公司的INA159)的輸入端。100 kΩ電阻器的高輸入阻抗與±30 V的最大輸入電壓使得這一連接成為可能。另外還可對(duì)內(nèi)部電阻器進(jìn)行微調(diào),以達(dá)到最佳的線性度及共模抑制比(CMRR)。
A16B-1212-0100位6通道同步采樣的低功耗SAR轉(zhuǎn)換器通過(guò)6個(gè)ADC提供固有的采樣和保持特性,該器件可用于電源測(cè)量應(yīng)用。在該應(yīng)用中,測(cè)量三相電壓與三相電流。
A16B-1212-0100第三種可選解決方案是使用ΔΣ ADC來(lái)轉(zhuǎn)換輸入信號(hào)。使用ΔΣ ADC轉(zhuǎn)換器進(jìn)行測(cè)量的主要優(yōu)勢(shì)之一是可以使用數(shù)字濾波器。數(shù)字濾波器不僅能夠?yàn)V除轉(zhuǎn)換器的量化噪聲,而且還能以固有的方式對(duì)此類應(yīng)用中存在的較大噪聲定形,并將其排除在信號(hào)頻帶之外。在某些測(cè)量中除采用前面提到的6通道外還增加了另外兩個(gè)通道。在這些情況下,也可以測(cè)量零線(neutral line)電壓與電流。ΔΣ轉(zhuǎn)換器(例如TI公司的ADS1204)具有四個(gè)16位性能獨(dú)立的ΔΣ調(diào)制器。通過(guò)使用兩個(gè)ADS1204轉(zhuǎn)換器,可以同時(shí)從8個(gè)輸入通道獲得測(cè)量數(shù)據(jù)。
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