電子專業(yè)畢業(yè)設(shè)計(jì)論文外文文獻(xiàn)及翻譯-全雙橋電機(jī)保護(hù)驅(qū)動(dòng)器a3976(存儲(chǔ)版)
【正文】 rgy in space vehicles. With present technology, however, they remain too expensive for largescale generation of electricity. Therefore, most schemes for the utilization of solar power depend upon the collection of thermal energy, followed by conversion to electrical energy. The simplest such approach involves focusing sunlight on a steamgenerating bioler. Parabolic refkectors can be used to focus sunlight on pipes containing heattransporting fluids. Selective coatings on these pipes can be used so that only a small percentage of incident energy is reradiated from the pipes. （二）翻譯 全雙橋電機(jī)保護(hù)驅(qū)動(dòng)器（ A3976） A3759是一種用來(lái)驅(qū)動(dòng)雙極性步進(jìn)電機(jī)雙繞組的單片集成電路，也可以用來(lái)雙向控制兩臺(tái)電動(dòng)機(jī)。C to +150176。中文 2723字 外文文獻(xiàn) （一）原文 DUAL FULL BRIDGE PROTECTED MOTOR DRIVER（ A3976） The A3976 is designed to drive both windings of a bipolar stepper motor or bidirectionally control two DC Motors. Both HBridges are capable of continuous output currents of up to +/ 500 mA and operating voltages to 30V. Free wheeling, substrate isolated diodes are included for output transient suppression when switching motors or other inductive loads. For each bridge the PHASE input controls load current polarity by selecting the appropriate source and sink driver pair. The ENABLE input, when held high, enables the respective output Hbridge. When both ENABLE pins are held low the device will enter SLEEP mode and consume less than 100mA. The 3976 is protected to ensure safe operation in harsh operating environments and was designed specifically for automotive applications. Protection circuitry will check for open or shorted load, motor lead short to ground or supply, VBB overvoltage, VCC undervoltage, and thermal shutdown. If any of these conditions are detected the outputs will be disabled and fault information will be output to diagnostic pins FAULT1 and FAULT2. The 3976 is supplied in a choice of two power packages, a 16lead plastic DIP with a copper batwing tab (suffix ‘B’), and a 24lead plastic SOIC with a copper batwing tab (suffix ‘LB’). In both cases, the power tab is at ground potential and needs no electrical isolation. FEATURES （ 1） 30 V , 177。C Storage Temperature Range, TS...............................55176。 it should not add to the earth39。保護(hù)電路能夠檢測(cè)到負(fù)載開(kāi)路或者短路、電動(dòng)機(jī)短路接地或短路接電源、功率電源 VBB過(guò)電壓、邏輯電源 VCC欠電壓、過(guò)熱關(guān)斷等。JA R216。當(dāng)出現(xiàn)一個(gè)故障引起的中斷后，其對(duì)應(yīng)的驅(qū)動(dòng)部分將會(huì)停止 5微秒。 能源與太陽(yáng)能 能源就是能夠用于工作和驅(qū)動(dòng)機(jī)器的能量。煤炭在能源的利用方面的比例已經(jīng)越來(lái)越低，而石油和天然氣正在被大量的使用著。 自從 1973～ 1974年的第一次“能源危機(jī)”以來(lái)，已經(jīng)出現(xiàn)了一些具體的措施。在任何領(lǐng)域節(jié)約能源都是可行的。太陽(yáng)能滿足這些標(biāo)準(zhǔn)，其產(chǎn)生的多余的熱量會(huì)從地球輻射出去。這種方式目前最簡(jiǎn)單的設(shè)計(jì)是蒸汽發(fā)電裝置，收集 到的太陽(yáng)能通過(guò)管道中的載熱氣體進(jìn)行輸送。當(dāng)然，亞利桑那州的許多居民渴不喜歡國(guó)家大力發(fā)展太陽(yáng)能的收集，而且一些環(huán)保組織也因?yàn)樘?yáng)能的收集對(duì)響尾蛇的生活習(xí)性等產(chǎn)生的影響而抗議太陽(yáng)能收集裝置的實(shí)行。周期成本與用于節(jié)省資金的方法與經(jīng)濟(jì)利益同等重要。 在能源危機(jī)的同時(shí)，世界范圍內(nèi)還有一些食品和礦產(chǎn)資源的短缺，其次一些物品的生產(chǎn)則出現(xiàn)過(guò)剩，如小麥和銅的生產(chǎn)過(guò)剩，一些銅生產(chǎn)國(guó)將銅以銅幣的形式出口。 自從 1859年第一個(gè) 商業(yè)油田的建成以來(lái)，美國(guó)已經(jīng)生產(chǎn)了超過(guò) 100萬(wàn)桶石油，其中大部分是在最近幾年生產(chǎn)的。然而，在這種情況下，由于許多
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