开关电源中英文翻译

1、Switching Power SupplySwitching power supply is a voltage conversion circuit, the main work is the step-up and step-dow n, are widely used in moder n electro nic products. Always work because the switchi ng tran sistor in the "on" and "off" state, so called switch ing power suppl

2、y. Switch ing power supply in real terms is an oscillator circuit, the conv ersi on of electrical en ergy not only used in power circuit, the circuit in other applicati ons are also com mon, such as LCD backlight circuits, such as fluoresce nt lamps. Switch the source compared with the tran sformer

3、high efficie ncy, good stability, small size and other advantages,disadvantages is the relatively small power, and high-frequency in terfere nee on the circuit, circuit complexity, such as easy maintenan ce.Talking about switching power supply before you familiar with the feedback oscillator circuit

4、 transformer, can produce a regular pulse current or voltage of the circuit is called oscillation circuit, transformer feedback oscillator circuit is able to meet these con diti ons the circuit; it in the basic amplifier circuit with a feedback loop composed of C2, L1 elect ion to form a parallel re

5、s onant freque ncy circuit, the instantaneous power in the circuit turn-VT, this time in the C2, L1, composed of parallel res onant circuits have a very rich harm onic, whe n the plus parallel res onance freque ncy and the n atural freque ncy of the same circuit, the circuit to en ter a state of osc

6、illati on, and VT through L3 feedback to further enl arge the base, and ultimately the formati on of a regular pulse curre nt or voltage output to the load RL. Switch ing power supply is around the transformer and the feedback oscillator circuit design, but the basis of the orig inal in crease in th

7、e nu mber of protect ion and con trol circuits, an alysis of our oscillation circuit can be used to analyze the method of switching power supply.Switching Power Supply vibration by way of sub-swing can be divided into self-excited and it excited the two, since there is no need for plus-excited self-

8、oscillati on sig nal source, since the excitati on can see it as a feedback oscillator circuit tran sformer, and it is excited is totally depe ndent on the outside to mai ntain the oscillati on, in the practical applicati on of self-excitati on of a comprehe nsive range of applications. According to

9、 the structure of incentives signal classification; can be divided into pulse-width-modulated pulse amplitude modulati on and two pulse-width-modulated sig nal to con trol the width, that is, freque ncy, pulse amplitude modulation control signal of the magnitude of the role of the two the same so th

10、at oscillati on freque ncy is maintained at withi n a certa in ran ge, to the effect of voltage stability. Win di ng tran sformer can be divided in to three types in gen eral, a group invoIved in the primary winding of the oscillation, a group is to maintain the oscillati on of the feedback winding,

11、 there is a group of the load windin gs. Household appliances used in switching power supply,after the AC to 220V bridge rectifier, conv erted into about 300V DC, filter into the tran sformer is added after the switch to high-frequency oscillations of the collector, feedback winding back to the base

12、 to maintain the oscillation circuit, load sensor windings of the electrical signal, by rectificatio n, filteri ng, the DC voltage regulator has bee n to provide power to the load. Win di ng in the provisi on of electric power load, but also take up the capacity of voltage stability, the theory is t

13、he n a circuit voltage output voltage sampli ng devices to monitor the output voltage changes, timely feedback to adjust the oscillation freque ncy oscillator circuit to achieve the voltage stability The purpose of the circuit in order to avoid interferenee, the feedback voltage to the oscillator ci

14、rcuit will be isolated optocoupler. Most switches have a sta ndby power circuit, switchi ng power supply in sta ndby mode still oscillat ing, but the freque ncy of no rmal worki ng hours than lower.Some switching power supply are complex, numerous components, many protect ion and con trol circuit, i

15、n the abse nee of tech ni cal support, maintenance is a headache with the matter. I face this kind of situation is, first of all, I will find the switch and its participati on in the exter nal oscillati on circuit, it separatedfrom the circuit to see if it met the con diti ons for oscillati on, such

16、 as detecti on bias and whether it is no rmal, whether positive feedback failure, as well as its own switches, switch ing power supply has very large protect ion, after exclusi on of the prosecuti on and load control and protection circuit.the control circuit while output from the sample, with the s

17、et sta ndards, the n con trolled inv erter, cha nge its freque ncy or pulse width output achieve stability, on the other hand, accordi ng to test data provided by the circuit by circuit protection identification, Control circuit for the unit for various protection measures.SMPS developme nts and tre

18、nds in the Un ited States in 1955 Roje (GH.Roger) inven tio n of the self-excited oscillati on push redeem tran sistor sin gle tran sformer DC conv erters, high-freque ncy con versi on is the beg inning of con trol circuit, 1957 Un ited States inv estigati on tour name nt (Je n Sen) since the inven

19、ti on of the push-pull double Flyback tran sformers, 1964 America n scie ntists proposes to abolish the freque ncy tran sformer series switchi ng power supply sce nario, This power to the right size and weight of the decli ne was a fun dame ntal way. To the 1969 high-power silic on tran sistor becau

20、sethe pressure in crease diode reverse recovery time shorte ned, and other comp onents improve, and fin ally turned into a 25 kHz switch ing power supply.Curre ntly, switchi ng power supply to small, Light volume and the characteristics of high efficiency has been widely used in electronic computer-

21、driven variety of terminal equipme nt. Communi cati ons equipme nt almost all electr onic equipme nt, the electronic information industry indispensable to the rapid development of a power mode. Currently the market for sale in the switching power supply using bipolar tran sistors made of 100kHz. use

22、 made of 500kHz MOS power, though practical, but its frequency to be further enhanced. To improve the switching frequency, it is n ecessary to reduce the switch ing loss, and to reduce the switch ing loss, you n eed to have high-speed switchi ng devices. However, the switch ing speed, will be affect

23、ed by the circuit in ducta nee and capacita nee diode or stored charge aris ing from the impact of the surge or no ise. This will not only affect the surro unding electro nic equipme nt, but also greatly reduce the reliability of the power supply itself. Among them, with the switch to prevent Kai-cl

24、osed by the voltage surge, it is R-C or L-C Composite bumpers, and the storage charge by the diode curre nt surge caused by the use made of amorphous cores such as mag netic bumper. However, the high freque ncy of 1 MHz and above, using res onant circuit, Switch to en able the voltage or curre nt th

25、rough the switch was a sine, which could reduce the switchi ng loss, This can also con trol the surge occurred. Switches such as res onant mode switch ing. Curre ntly such SMPS of very active, because this means no sig nifica nt in crease switchi ng speed can theoretically put switch ing loss fall t

26、o zero. and the no ise is small, is expected to become high-freque ncy switchi ng power supply of one of the main ways. At prese nt, many countries in the world are working on several trillion Hz converter practical research.开关电源开关电源是一种电压转换电路，主要的工作内容是升压和降压，广泛应用于现代电子产品。因为开关三极管总是工作在“开”和“关”的状态，所以叫开关电源。

27、开关电源实质就是一个振荡电路，这种转换电能 的方式，不仅应用在电源电路，在其它的电路应用也很普遍，如液晶显示 器的背光电路、日光灯等。开关源与变压器相比具有效率高、稳性好、体 积小等优点，缺点是功率相对较小，而且会对电路产生高频干扰，电路复 杂不易维修等。在谈开关电源之前，先熟悉一下变压器反馈式振荡电路，能产生有规 律的脉冲电流或电压的电路叫振荡电路，变压器反馈式振荡电路就是能满 足这种条件的电路；它于基本放大电路与一个反馈回路组成，其中C2、L1组成一个并联谐振选频电路，在电路通电的瞬间VT导通，此时在 C2、L1组成的并联谐振电路上产生非常丰富的谐波，当外加频率和并联谐振电路 的固有频率相

28、等时，电路进入振荡状态，并通过L3反馈到VT的基极进一步放大，最终形成有规律的脉冲电流或电压输出到负载RL上。开关电源就是围绕变压器反馈式振荡电路而设计，只不过在原来的基础上增加了一些保 护和控制电路，我们可以用分析振荡电路的方法来分析开关电源。开关电源振按荡方式分，可以分为自激式和它激式两种，自激式是无 须外加信号源能自行振荡，自激式完全可以把它看作是一个变压器反馈式 振荡电路，而它激式则完全依赖于外部维持振荡，在实际应用中自激式应 用比较广泛。根据激励信号结构分类；可分为脉冲调宽和脉冲调幅两种， 脉冲调宽是控制信号的宽度，也就是频率，脉冲调幅控制信号的幅度，两 者的作用相同都是使振荡频率维

29、持在某一范围内，达到稳定电压的效果。 变压器的绕组一般可以分成三种类型，一组是参与振荡的初级绕组，一组 是维持振荡的反馈绕组，还有一组是负载绕组。在家用电器中使用的开关 电源，将220V的交流电经过桥式整流，变换成300V左右的直流电，滤波后进入变压器后加到开关管的集电极进行高频振荡，反馈绕组反馈到基极维 持电路振荡，负载绕组感应的电信号，经整流、滤波、稳压得到的直流电 压给负载提供电能。负载绕组在提供电能的同时，也肩负起稳定电压的能 力，其原理是在电压输出电路接一个电压取样装置，监测输出电压的变化 情况，及时反馈给振荡电路调整振荡频率，从而达到稳定电压的目的，为 了避免电路的干扰，反馈回振荡电路的电压会用光电耦合器隔离。大多数 开关电源有待机电路，在待机状态开关电源还在振荡，只是频率比正常工 作时要低。有些开关电源很复杂，元件密密麻麻，很多保护和