開關(guān)電源中英文翻譯

1、Switching Power Supply Switching power supply is a voltage conversion circuit, the main work is the step-up and step-down, are widely used in modern electronic products. Always work because the switching transistor in the on and off state, so called switching power supply. Switching power supply in

2、real terms is an oscillator circuit, the conversion of electrical energy not only used in power circuit, the circuit in other applications are also common, such as LCD backlight circuits, such as fluorescent lamps. Switch the source compared with the transformer high efficiency, good stability, smal

3、l size and other advantages,disadvantages is the relatively small power, and high-frequency interference on the circuit, circuit complexity, such as easy maintenance. Talking about switching power supply before you familiar with the feedback oscillator circuit transformer, can produce a regular puls

4、e current or voltage of the circuit is called oscillation circuit, transformer feedback oscillator circuit is able to meet these conditions the circuit; it in the basic amplifier circuit with a feedback loop composed of C2, L1 election to form a parallel resonant frequency circuit, the instantaneous

5、 power in the circuit turn-VT, this time in the C2, L1, composed of parallel resonant circuits have a very rich harmonic, when the plus parallel resonance frequency and the natural frequency of the same circuit, the circuit to enter a state of oscillation, and VT through L3 feedback to further enlar

6、ge the base, and ultimately the formation of a regular pulse current or voltage output to the load RL. Switching power supply is around the transformer and the feedback oscillator circuit design, but the basis of the original increase in the number of protection and control circuits, analysis of our

7、 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-oscillation signal source, since the excitation can see it as a

8、 feedback oscillator circuit transformer, and it is excited is totally dependent on the outside to maintain the oscillation, in the practical application of self-excitation of a comprehensive range of applications. According to the structure of incentives signal classification; can be divided into p

9、ulse-width-modulated pulse amplitude modulation and two pulse-width-modulated signal to control the width, that is, frequency, pulse amplitude modulation control signal of the magnitude of the role of the two the same so that oscillation frequency is maintained at within a certain range, to the effe

10、ct of voltage stability. Winding transformer can be divided into three types in general, a group involved in the primary winding of the oscillation, a group is to maintain the oscillation of the feedback winding, there is a group of the load windings. Household appliances used in switching power sup

11、ply,after the AC to 220V bridge rectifier, converted into about 300V DC, filter into the transformer is added after the switch to high-frequency oscillations of the collector, feedback winding back to the base to maintain the oscillation circuit, load sensor windings of the electrical signal, by rec

12、tification, filtering, the DC voltage regulator has been to provide power to the load. Winding in the provision of electric power load, but also take up the capacity of voltage stability, the theory is then a circuit voltage output voltage sampling devices to monitor the output voltage changes, time

13、ly feedback to adjust the oscillation frequency oscillator circuit to achieve the voltage stability The purpose of the circuit in order to avoid interference, the feedback voltage to the oscillator circuit will be isolated optocoupler. Most switches have a standby power circuit, switching power supp

14、ly in standby mode still oscillating, but the frequency of normal working hours than lower. Some switching power supply are complex, numerous components, many protection and control circuit, in the absence of technical support, maintenance is a headache with the matter. I face this kind of situation

15、 is, first of all, I will find the switch and its participation in the external oscillation circuit, it separatedfrom the circuit to see if it met the conditions for oscillation, such as detection bias and whether it is normal, whether positive feedback failure, as well as its own switches, switchin

16、g power supply has very large protection, after exclusion of the prosecution and load control and protection circuit.the control circuit while output from the sample, with the set standards, then controlled inverter, change its frequency or pulse width output achieve stability, on the other hand, ac

17、cording to test data provided by the circuit by circuit protection identification, Control circuit for the unit for various protection measures. SMPS developments and trends in the United States in 1955 Roje (GH.Roger) invention of the self-excited oscillation push redeem transistor single transform

18、er DC converters, high-frequency conversion is the beginning of control circuit, 1957 United States investigation tournament (Jen Sen) since the invention of the push-pull double Flyback transformers, 1964 American scientists proposes to abolish the frequency transformer series switching power suppl

19、y scenario, This power to the right size and weight of the decline was a fundamental way. To the 1969 high-power silicon transistor becausethe pressureincrease diode reverse recovery time shortened, and other components improve, and finally turned into a 25 kHz switching power supply. Currently, swi

20、tching power supply to small, Light volume and the characteristics of high efficiency has been widely used in electronic computer-driven variety of terminal equipment, Communications equipment almost all electronic equipment, the electronic information industry indispensable to the rapid development

21、 of a power mode. Currently the market for sale in the switching power supply using bipolar transistors made of 100kHz. use made of 500kHz MOS power, though practical, but its frequency to be further enhanced. To improve the switching frequency, it is necessary to reduce the switching loss, and to r

22、educe the switching loss, you need to have high-speed switching devices. However, the switching speed, will be affected by the circuit inductance and capacitance diode or stored charge arising from the impact of the surge or noise. This will not only affect the surrounding electronic equipment, but

23、also greatly reduce the reliability of the power supply itself. Among them, with the switch to prevent Kai-closed by the voltage surge, it is R-C or L-C Composite bumpers, and the storage charge by the diode current surge caused by the use made of amorphous cores such as magnetic bumper. However, th

24、e high frequency of 1 MHz and above, using resonant circuit, Switch to enable the voltage or current through the switch was a sine, which could reduce the switching loss, This can also control the surge occurred. Switches such as resonant mode switching. Currently such SMPS of very active, because t

25、his means no significant increase switching speed can theoretically put switching loss fall to zero. and the noise is small, is expected to become high-frequency switching power supply of one of the main ways. At present, many countries in the world are working on several trillion Hz converter pract

26、ical research.開關(guān)電源 開關(guān)電源是一種電壓轉(zhuǎn)換電路，主要的工作內(nèi)容是升壓和降壓，廣 泛應(yīng)用于現(xiàn)代電子產(chǎn)品。因為開關(guān)三極管總是工作在 “開”和“關(guān)”的 狀態(tài)，所以叫開關(guān)電源。開關(guān)電源實質(zhì)就是一個振蕩電路，這種轉(zhuǎn)換電能 的方式，不僅應(yīng)用在電源電路，在其它的電路應(yīng)用也很普遍，如液晶顯示 器的背光電路、日光燈等。開關(guān)源與變壓器相比具有效率高、穩(wěn)性好、體 積小等優(yōu)點，缺點是功率相對較小，而且會對電路產(chǎn)生高頻十擾，電路復(fù) 雜不易維修等。 在談開關(guān)電源之前，先熟悉一下變壓器反饋式振蕩電路，能產(chǎn)生有規(guī) 律的脈沖電流或電壓的電路叫振蕩電路，變壓器反饋式振蕩電路就是能滿 足這種條件的電路；它于基本放

27、大電路與一個反饋回路組成，其中 C2、L1 組成一個并聯(lián)諧振選頻電路，在電路通電的瞬間 VT導(dǎo)通，此時在 C2、L1 組成的并聯(lián)諧振電路上產(chǎn)生非常豐富的諧波，當外加頻率和并聯(lián)諧振電路 的固有頻率相等時，電路進入振蕩狀態(tài)，并通過 L3反饋到VT的基極進一步 放大，最終形成有規(guī)律的脈沖電流或電壓輸出到負載 RL上。開關(guān)電源就是 圍繞變壓器反饋式振蕩電路而設(shè)計，只不過在原來的基礎(chǔ)上增加了一些保 護和控制電路，我們可以用分析振蕩電路的方法來分析開關(guān)電源。 開關(guān)電源振按蕩方式分，可以分為自激式和它激式兩種，自激式是無 須外加信號源能自行振蕩,自激式完全可以把它看作是一個變壓器反饋式 振蕩電路，而它激式則

28、完全依賴于外部維持振蕩，在實際應(yīng)用中自激式應(yīng) 用比較廣泛。根據(jù)激勵信號結(jié)構(gòu)分類；可分為脈沖調(diào)寬和脈沖調(diào)幅兩種， 脈沖調(diào)寬是控制信號的寬度，也就是頻率，脈沖調(diào)幅控制信號的幅度，兩 者的作用相同都是使振蕩頻率維持在某一范圍內(nèi)，達到穩(wěn)定電壓的效果。 變壓器的繞組一般可以分成三種類型，一組是參與振蕩的初級繞組，一組 是維持振蕩的反饋繞組，還有一組是負載繞組。在家用電器中使用的開關(guān) 電源，將220V的交流電經(jīng)過橋式整流，變換成 300V左右的直流電，濾波后 進入變壓器后加到開關(guān)管的集電極進行高頻振蕩，反饋繞組反饋到基極維 持電路振蕩，負載繞組感應(yīng)的電信號，經(jīng)整流、濾波、穩(wěn)壓得到的直流電 壓給負載提供電能。負載繞組在提供電能的同時，也肩負起穩(wěn)定電壓的能 力，其原理是在電壓輸出電路接一個電壓取樣裝置，監(jiān)測輸出電壓的變化 情況，及時反饋給振蕩電路調(diào)整振蕩頻率，從而達到穩(wěn)定電壓的目的，為 了避免電路的十擾，反饋回振蕩電路的電壓會用光電耦合器隔離。大多數(shù) 開關(guān)電源有待機電路，在待機狀態(tài)開關(guān)電源還在振蕩，只是頻率比正常工 作時要低。 有些開關(guān)電源很復(fù)雜，元件密密麻麻，很多保護和控制電路，在沒有 技術(shù)支持的情況下，維修起來是一件很