如何利用數(shù)字電源管理進(jìn)行能量采集

　　數(shù)字電源管理是任何能源采集系統(tǒng)的重要組成部分。數(shù)字控制是允許一個(gè)單一的設(shè)備來處理范圍廣泛的能源有非常不同的要求，從光伏電池的最大功率點(diǎn)跟蹤（MPPT）的壓電和高阻抗的熱源

　　該bq25505裝置設(shè)計(jì)提取能量收集各種來源產(chǎn)生的微電。數(shù)字管理確保一個(gè)二次充電電池不收取多由這個(gè)提取的電源，電壓升壓，也不會(huì)耗盡超出安全限制的系統(tǒng)負(fù)載。

　　一個(gè)集成的多路復(fù)用器柵極驅(qū)動(dòng)器自主切換系統(tǒng)負(fù)載到一個(gè)主要的非可充電電池，如果二次電池電壓低于用戶定義的閾值，允許設(shè)計(jì)人員為不同的應(yīng)用程序優(yōu)化系統(tǒng)。

　　Figure 1： The bq25505 from Texas Instruments showing the pins for the digital power management.

　　The design starts with a DC-DC boost charger that requires only microwatts of power to begin operating. The main boost charger is powered from the boost output， VSTOR， as shown in Figure 1. Once the VSTOR voltage is above the VSTOR_CHGEN generator value， typically 1.8 V， the boost charger can effectively extract power from low voltage output harvesters such as TEGs or single- or dual-cell solar panels that produce voltages down to 100 mV. When the boost output is less than 100 mV， the cold start circuit needs to have at least 330 mV to charge VSTOR up to 1.8 V.