Abstract: The DC switching power supply protection system, protection system design principles and machine protection measures, an analysis of switching power supply in the range of protected characteristics and its design methodology,introduced a number of practical protection circuit.
Keywords: switching power supply protection circuit system design
1、Introduction
DC switching regulator used in the price of more expensive high-power switching devices, the control circuit is also more complex, In addition, the load switching regulators are generally used a large number of highly integrated electronic systems installed devices. Transistors and integrated device tolerance electricity, less heat shocks. Switching Regulators therefore should take into account the protection of voltage regulators and load their own safety. Many different types of circuit protection, polarity protection, introduced here, the program protection, over-current protection, over-voltage protection, under-voltage protection and over-temperature protection circuit. Usually chosen to be some combination of protection, constitutes a complete protection system.
摘 要：討論了直流開(kāi)關(guān)穩(wěn)壓電源的保護(hù)系統(tǒng),提出保護(hù)系統(tǒng)設(shè)計(jì)的原則和整機(jī)保護(hù)的措施，分析了開(kāi)關(guān)穩(wěn)壓電源中的各種保護(hù)的特點(diǎn)及其設(shè)計(jì)方法,介紹了幾種實(shí)用保護(hù)電路。
關(guān)鍵字：開(kāi)關(guān)電源 保護(hù)電路 系統(tǒng)設(shè)計(jì)
1、引言　
　　直流開(kāi)關(guān)穩(wěn)壓器中所使用的大功率開(kāi)關(guān)器件價(jià)格較貴,其控制電路亦比較復(fù)雜,另外,開(kāi)關(guān)穩(wěn)壓器的負(fù)載一般都是用大量的集成化程度很高的器件安裝的電子系統(tǒng)。晶體管和集成器件耐受電、熱沖擊的能力較差。因而開(kāi)關(guān)穩(wěn)壓器的保護(hù)應(yīng)該兼顧穩(wěn)壓器本身和負(fù)載的安全。保護(hù)電路的種類(lèi)很多,這里介紹極性保護(hù)、程序保護(hù)、過(guò)電流保護(hù)、過(guò)電壓保護(hù)、欠電壓保護(hù)以及過(guò)熱保護(hù)等電路。通常選用幾種保護(hù)方式加以組合,構(gòu)成完善的保護(hù)系統(tǒng)。