高壓電源模塊簡(jiǎn)化控制系統(tǒng)設(shè)計(jì)

　　工業(yè)控制系統(tǒng)的電壓要求在上升。例如，將以太網(wǎng)（POE）上的電源集成到這些系統(tǒng)中，正鼓勵(lì)設(shè)計(jì)者將傳統(tǒng)的24 V電源遷移到新技術(shù)要求的48 V。

　　這些系統(tǒng)要求輸入電壓需要轉(zhuǎn)換為5或3 V（甚至更低）來提供電子設(shè)備。創(chuàng)建一個(gè)或多個(gè)這些低壓軌由低壓控制器與其他驅(qū)動(dòng)程序的傳統(tǒng)解決方案，場(chǎng)效應(yīng)晶體管（FET），有時(shí)變壓器；和高降壓比通常涉及一個(gè)以上的功率級(jí)。

　　然而，現(xiàn)代的控制系統(tǒng)使用緊湊的模塊化單元來容納部件，所以空間很緊。這導(dǎo)致了對(duì)不需要空間消耗強(qiáng)迫冷卻的電子產(chǎn)品的需求。取代傳統(tǒng)的電源與緊湊，高效，硅基功率模塊首選的消費(fèi)電子產(chǎn)品設(shè)計(jì)師是對(duì)這一挑戰(zhàn)的答案。

　　However， switching to silicon power is not easy because， while the nominal voltages of industrial control systems are within the capability of modern integrated switching DC/DC voltage regulators， voltage spikes of up to 100 V are not uncommon. Such transient overvoltages are sufficient to destroy a silicon regulator in seconds. Engineers are forced to add expensive and voltage-clamping networks to protect sensitive silicon power supplies， increasing design complexity， using up space and adding cost.

　　Fortunately， a new generation of wide-input voltage， integrated silicon power supplies are becoming available that can tolerate large voltage spikes without incurring damage or exposing downstream circuitry to the transients. This article describes some of these products and their application.