【正文】 y of the DC power supply regulator, to work. Wizard of singleuse devices can achieve power supply polarity protection. The most simple polarity protection circuit as shown in Figure 1. The diode D to flow switching regulator of the input current, this circuit applications in lowpower switching regulators to be more suitable. In the larger power of the occasion, put procedures polarity protection circuit as a link in the protection, eliminating the polarity protection for highpower diodes, power will be reduced. In order to facilitate the operation, ease of identification polarity correct or not, in Figure 1 in the diode, then light.Switching power supply circuit plexity, basically can be divided into lowpower and highpower control part of the switch. Is a highpower switching transistors, for the protection of switching transistors in the open or shutdown the safety of power, we must let modulator, such as a lowpower amplifier control circuit. Accordingly, we must ensure that the correct procedures boot. Switching Regulators general of the inputs to a small inductance, capacitance of the input filter. Boot in an instant, filter capacitor will flow through large inrush current, inrush current can be several times more than the normal input current. This large inrush current general will contact the power switch or relay contacts melting, and the input fuse links. In addition, the inrush current will damage capacitors to shorten the life of premature damage. To this end, a boot should access the current limiting resistor, through the current limiting resistor capacitor to the charge. In order not to limit the flow resistance of the excessive consumption of power, which affects the normal switching regulator, in the boot after the end of the transient process, with a short then automatically relays it to DC power directly to the switching regulator electricity, as shown in Figure 2. This circuit switching regulator known that the softstart circuit.Switching Regulators in the control circuit logic ponents or operational amplifiers required auxiliary power supply. To this end, auxiliary power switch must be in the circuit. This circuit can be controlled to ensure the boot. The procedure is generally boot: Identification of the polarity of the input power supply voltage protection circuit → work boot → auxiliary power supply and work through the current limiting resistor R of the switching regulator39。s input capacitor C → Switching Regulators charge modulation circuit, Shortcircuit current limiting resistor → Switching Regulators stability. In the switching regulator, to start the machine, because of its large output capacitor capacity, filling the needs of the rated output voltage of a certain period of time. During this time, the importation of low sampling amplifier output voltage sampling, in accordance with the closedloop system of regulation will be forced to switch transistor ontime lengthened this way, the switching transistor during this period will bee discontinuous conduction , and easy to damage. To this end,the boot this request within a certain period of time, switch output modulation circuit switching transistor base to the drive pulse width modulation signal can be guaranteed by the deadline for switching transistor switching gradually bee normal state, and therefore should be set up to cope with boot protection Soft Start. 直流開關(guān)穩(wěn)壓電源的保護(hù)技術(shù)直流開關(guān)穩(wěn)壓調(diào)節(jié)器通常用于高電壓電源轉(zhuǎn)換設(shè)備中，并且價錢十分昴貴，控制系統(tǒng)也是十分的復(fù)雜同時配電器系統(tǒng)需要配有大量電子裝置的高集成度的設(shè)備來構(gòu)成，晶體管，電容 及它的熱沖擊能力也是十分重要的。對于直流開關(guān)穩(wěn)壓電源它的器件的穩(wěn)定性以及它的負(fù)荷能力，所以很多種形式的護(hù)電路應(yīng)用在這里的極性保護(hù)，和序保護(hù)，過電保護(hù)，過壓保護(hù)，低壓保護(hù)，散熱保護(hù)等，通常通過各種方法把這些保護(hù)電路和電路系統(tǒng)完 好的結(jié)合起來！直流穩(wěn)壓電路的輸入端通常情況下不是穩(wěn)定的直流源一般而言把普通交流電接到輸入端，這樣的做如果不經(jīng)轉(zhuǎn)換裝置直接接到需要直流的電路中通常會產(chǎn)生錯誤或?qū)﹄娐返臉O性產(chǎn)生損傷，將會損壞這個開關(guān)電源。極性保護(hù)電路的作用正是當(dāng)在這些情況下對電路進(jìn)行保護(hù)使其正常工作的作用，使信號發(fā)生設(shè)備在此極性保護(hù)電路支持下正常工作。其中，為防止隨開關(guān)啟閉所發(fā)生的電壓浪涌，可采用RC或LC緩沖器，而對由二極管存儲電荷所致的電流浪涌可采用非晶態(tài)等磁芯制成的磁緩沖器。不過，對1MHz以上的高頻，要采用諧振電路，以使開關(guān)上的電壓或通過開關(guān)的電流呈正弦波，這樣既可減少開關(guān)損耗，同時也可控制浪涌的發(fā)生。這種開關(guān)方式稱為諧振式開關(guān)。最簡單的極性保護(hù)電路的主要工作器件是二極管，流過穩(wěn)壓電源 的電流簡單的通過二極管循環(huán)流動，然而這個簡單的裝置應(yīng)用在簡單的低壓直流穩(wěn)壓電源中是比較合適的。更復(fù)雜一些的電源的極性保護(hù)電路在極性保護(hù)和濾波等方面起著非常重要的作用，高壓二極管就會比較適合。為了使其更加簡易保護(hù)高品質(zhì)的二極管是非常重要的。直流開關(guān)穩(wěn)壓電源的電路還是比較復(fù)雜的，在基本的開關(guān)穩(wěn)壓電路部分分為了低壓電路部分和高壓電路部分。一個高壓開關(guān)轉(zhuǎn)換晶體管在電路的開啟和關(guān)閉的時候起到很大的作用。開關(guān)穩(wěn)壓裝置通常在輸入端濾波器前加入一個小的濾波電容，在輸入端經(jīng)常出現(xiàn)瞬間起峰電流，濾波電容的主要作用就是要濾除掉這些對電路產(chǎn)生不良影響的電流，一個較大的起峰電流可能會取代輸入電流或者把繼電器接觸點熔化，瞬間起峰電流還可能使濾波電容擊穿，從而使電路短路把電路燒毀，因些我們還需要一個限流電阻器，這樣電流就能得到有效的控制。為了避免限流電阻過度消耗能量對轉(zhuǎn)換裝置產(chǎn)生干擾，