外文翻译--高频开关电源介绍

1、.The Introduction Of High Frequency Switching Power Supply Introduction:High frequency switching power supply (also called switch rectifier SMR) through the MOSFET or the high frequency IGBT, switch frequency control in 50-100 KHZ, within the scope of efficient and realize miniaturization. In recent

2、 years, switch rectifier power capacity expansion, the capacity of himself, from the volt 48V/12.5A、48V/20A to48V/200A、48V/400A。High frequency switching power supply is traditional rectifier (silicon rectifier, silicon-controlled rectifier) upgrade alternative products. High frequency switching powe

3、r supply with convenient use, small size, high efficiency, stable work, coating meticulous etc absolute superiority quickly dominate the market. Widely used in electroplating electrolysis surface treatment industry oxidation and get old and new customers.Product features:一This product USES imported

4、brand components and international advanced bridge in precision machining technology of inverter, and make the performance is stable, the quality is reliable.二For high-frequency pulse waveforms output ripple coefficient, the 1%, can improve the number of plating and surface aestivation, refuse the g

5、loss and got a dark corner of plating. And can reduce the loss, raw materials of plating industry of special requirements.三SFG series high frequency switching power supply by air-filled type design, installation convenience. With remote control device, easy for operation. Can bring load switch machi

6、ne, reduce the adjustment of the complex procedures.四. Small volume light weight the comprehensive use of anticorrosive craft, enhance the ability of anti-corrosion products, prolong the life.五. Energy saving, high working efficiency reached more than 90%, any more than a linear always voltage match

7、ing. Save the traditional rectifier regulator and the energy loss, in more than 35%, greatly reduce the cost, the reason of surface treatment industryHigh frequency switching power supply一 The main circuitFrom the input and output of dc exchange network, including:1The whole the effect is input filt

8、er: there will be the clutter power filter, also hindered the feedback to produce clutter of public power.2And rectification and filtering: ac power grid directly to a smooth dc rectification, in order to the next level.3Inverter: after rectifying dc into high frequency alternating, this is the core

9、 part of switch power supply, the higher the frequency volume, and weight and output power than smaller.4And output rectifier and filtering: according to provide reliable, load of the dc power supply.Second control circuit ：On one hand, the sample from the output terminal with setting standards, and

10、 then compared to control the inverter, change the frequency or pulse width, achieve output stability, on the other hand, according to the test circuit, the information provided by differential protection circuit, control circuit of various protection measures.Third detection circuit：In addition to

11、providing protection circuit is running in the various parameters but also provide various display meter data.Four, the auxiliary powerTo provide all the different requirements of a circuit switching voltage control principleSwitch to certain time interval K repeatedly through and disconnect the swi

12、tch, the power input, K E through switch and filter circuits provide load RL, throughout the switch power load during to provide energy, E, When the switch, input power disconnection K E will provide energy interrupted. Visible, to provide the energy input power load is intermittent, for the load ca

13、n be provided for energy switching power supply, a storage device, must be in switch will be part of the energy stored in the switch to load, release. In the figure, the inductance and capacitance C2 and diode L circuit, is composed of D this function. Inductance used in storing energy, l., and stor

14、ed in the switch of energy through the diode inductance L D, released to load get steady and continuous energy, because diode D make continuous load current, so called free-wheeling diode. In EAB average voltage between AB says: under the type used:EAB = TON/T * EFor every TON of time, the switch to

15、 switch the huge T works cycle (i.e. switch time TON TOFF cut-off time and sum).By type, changing switch time and work cycle, the ratio between the average voltage AB also changed, therefore, with the load and the input voltage changes automatically adjusted TON and the proportion of T he can make t

16、he output voltage V0 remain unchanged. Change through Time and work cycle TON of pulse that changing proportion of this method, SHCH as "Time Ratio Control" (from Time, abbreviation for TRC).According to the control principle TRC have three ways:A Pulse Width Modulation (Pulse Width Modula

17、tion, the abbreviation for PWM)Switch is constant, by changing the pulse width to change the way SHCH.Second, Pulse Frequency, Pulse Modulation (some Modulation abbreviated PFM)The constant change of the pulse width, through the working frequency switches to change the way SHCH.Third, mix modulation

18、Conduction pulse width and switch jobs are not fixed frequency, each other can change the way, and it is more than two ways of mixed.High frequency switching power supply 1 don't need to increase speed switches can theoretically the switch loss to zero, and noise is smallThe development of switc

19、h powerSwitching power supply for has the advantages of small size, light weight, high efficiency, low calorific value and stable performance advantages and gradually replace traditional manufacturing technology of continuous work power, and widely used in electronic machine and equipment. In the 19

20、80s, the full realization of computer, the switching power supply complete computer. In the 1990s, switch power supply in electronics, electrical equipment, and home appliance field has been widely applied; switch power technology into rapid development.Switching voltage stabilizer adopts power semi

21、conductor as switch, through the control switch SHCH adjustment output voltage. In power transistors (GTR), for example, when a switch tube saturated conductivity, the collector and emitter on both ends of the pressure drop to zero, When the switch tube, the collector current deadline to zero. So th

22、e consumption, efficiency can be up to 70-95. While consumption also decrease. Radiator switching voltage stabilizer for grid voltage directly rectifier, filter, and then adjusted by adjusting voltage switch pipe, need not power transformer. In addition, switch frequency for dozens of KHZ, filter ca

23、pacitor, inductor value. Therefore switching power supply is light weight, small size, etc. In addition, due to the low consumption, low temperature; improve the stability and reliability of the machine. And on the grid adaptive capability has increased, the average power serial Manos tat allows for

24、 220 ± 10% fluctuate, but switching voltage stabilizer in voltage in a 110-260 volts range change, can obtain stable output voltage.The high frequency switching power supply is the development of technology innovation technology, high frequency of the benefit is that switching power supply devi

25、ce to miniaturization, and make an unprecedented power switch into a wide range of areas, especially in the high-tech fields of application, promote the high-tech products of miniaturization, light. Now on the market of switch power supply power tube with a bipolar transistor, switch frequency can r

26、each several KHZ, The switch power MOSFET using frequency conversion of hundreds of KHZ. To improve the switch frequency, must adopt high speed switching devices. For the power switch frequency than MHZ available resonant circuit this way of working is called resonant switching mode.It can greatly i

27、mprove switch speed, theoretically switch loss to zero, the noise is small, and it is to improve the working frequency of switch power. By way of resonant switching converter has practical level MHZ. Pursuit of switch power supply technical development trend and can be summarized in the following fo

28、ur aspects.A miniaturization, thin, light, high frequency switching power supply of - of volume, weight is mainly composed of storage devices (magnetic components and capacitance), so the miniaturization of switch power supply is essentially to minimize the volume of storage devices, In a certain ra

29、nge, the switch frequency, not only can effectively reduce capacitance and inductance and the size of the transformer, but also can restrain the interference, improve the dynamic performance of the system. Therefore, high frequency switching power is the main development direction.Second, high relia

30、bility - the use of switch power supply for a job than components ten times, thus increasing the reliability. From the Angle of life, capacitors, optical coupler and platoon devices such as life determines the communication power of life. So, from design, use less as far as possible, improve integra

31、tion. Such not only solved the reliability of complex, the circuit, also increases protection function, simplify the circuit improve MTBF.Third, low noise - one of switch power supply noise is. Simply pursuit of high frequency and noise also is met subsequently increased. The partial resonant conver

32、ting circuit technology, in principle on which can not only improve the frequency and can reduce the noise. So, as far as possible to reduce the noise influence of switch power supply is a development direction.Four, using computer aided design and control - USES the latest technology design CDD CAA

33、 and transformation of topology and the best parameters, make the switch power structure and the best condition. Jane, in the circuit into microcomputers detection and control, monitoring system, can form multi-function real-time detection, record and automatic alarm and etc.The development of switc

34、h power supply is and semiconductor devices and the development of magnetic components. The high frequency, need corresponding high-speed semiconductorA high-frequency electromagnetic with excellent performance. Development power MOSFET, IGBT etc, develop new high-speed device with low frequency mag

35、netic materials, improving the loss of magnetic components of the structure and the design method, enhances the filter capacitor dielectric constant and reduce its equivalent series resistor etc, to switch power miniaturization has produced a great impetus 高频开关电源介绍简介高频开关电源(也称为开关型整流器SMR)通过MOSFET或IGBT

36、的高频工作，开关频率一般控制在50-100kHz范围内，实现高效率和小型化。近几年，开关整流器的功率容量不断扩大，单机容量己从48V/12.5A、48V/20A扩大到48V/200A、48V/400A。 高频开关电源是传统整流器（硅整流器 ，可控硅整流器）的升级替代产品。高频开关电源以使用方便，体积小，效率高，工作稳定，镀层细致等绝对的优势迅速占领市场。广泛使用于电镀，电解，氧化等表面处理行业，并得到新老客户的一致好评。 产品特点：1本产品采用进口名牌元器件和国际先进的全桥逆变换流技术精密加工而成，使整机的性能稳定，质量更加可靠。2.流输出波形为高频方波，纹波系数大大主小于1%，可提高镀数，拒

37、绝钝化，增强镀层表面的光泽度和镀件暗角的钻芯度。并可减少原材料的损耗，达到电镀行业的各种特殊要求。 3.SFG系列高频开关电源采用风冷式设计，安装方便。并配有远控装置，操作简单。可以带负载开关机，减少调节的烦琐程序。 4.体积小、重量轻，整机运用了全方位的防腐工艺制作，增强了产品的防腐蚀能力，延长了使用寿命。 5.高效，节能，工作效率达到90%以上，任意电压电流比始终成线性匹配。省去了传统整流器的调压器和主变的损耗，节能在35%以上，大大的减轻了电镀成本，实为表面处理行业最理智的选 高频开关电源原理一、主电路从交流电网输入、直流输出的全过程，包括： 1、输入滤波器：其作用是将电网存在的杂波过滤

38、，同时也阻碍本机产生的杂波反馈到公共电网。 2、整流与滤波：将电网交流电源直接整流为较平滑的直流电，以供下一级变换。 3、逆变：将整流后的直流电变为高频交流电，这是高频开关电源的核心部分，频率越高，体积、重量与输出功率之比越小。 4、输出整流与滤波：根据负载需要，提供稳定可靠的直流电源。 二、控制电路一方面从输出端取样，经与设定标准进行比较，然后去控制逆变器，改变其频率或脉宽，达到输出稳定，另一方面，根据测试电路提供的资料，经保护电路鉴别，提供控制电路对整机进行各种保护措施。三、检测电路除了提供保护电路中正在运行中各种参数外，还提供各种显示仪表资料。四、辅助电源提供所有单一电路的不同要求电源。

39、开关控制稳压原理开关K以一定的时间间隔重复地接通和断开，在开关K接通时，输入电源E通过开关K和滤波电路提供给负载RL，在整个开关接通期间，电源E向负载提供能量；当开关K断开时，输入电源E便中断了能量的提供。可见，输入电源向负载提供能量是断续的，为使负载能得到连续的能量提供，开关稳压电源必须要有一套储能装置，在开关接通时将一部份能量储存起来，在开关断开时，向负载释放。图中，由电感L、电容C2和二极管D组成的电路，就具有这种功能。电感L用以储存能量，在开关断开时，储存在电感L中的能量通过二极管D释放给负载，使负载得到连续而稳定的能量，因二极管D使负载电流连续不断，所以称为续流二极管。在AB间的电压

40、平均值EAB可用下式表示：EAB=TON/T*E式中TON为开关每次接通的时间，T为开关通断的工作周期（即开关接通时间TON和关断时间TOFF之和）。由式可知，改变开关接通时间和工作周期的比例，AB间电压的平均值也随之改变，因此，随着负载及输入电源电压的变化自动调整TON和T的比例便能使输出电压V0维持不变。改变接通时间TON和工作周期比例亦即改变脉冲的占空比，这种方法称为“时间比率控制”（Time Ratio Control,缩写为TRC）。按TRC控制原理，有三种方式： 一、脉冲宽度调制（Pulse Width Modulation,缩写为PWM） 开关周期恒定，通过改变脉冲宽度来改变占空比的方式。 二、脉冲频率调制（Pulse Frequency Modulation,缩写为PFM） 导通脉冲宽度恒定，通过改变开关工作频率来改变占空比的方式。 三、混合调制 导通脉冲宽度和开关工作频率均不固定，彼此都能改变的方式，它是以上二种方式的混合。 高频开关电源1不需要大幅度提高开关速度就可以在理论上把开关损耗降到零，而且噪声也小开关电源的发展开关电源因具有体积小、重量轻、效率高、发热量低、性能稳定等优点而逐渐取代传统技术制造的连续工作电源，并广泛应用于电子整机与设备中。20世纪80年代，计算机全面实现了开关电源化，率先完成计算机的电源换代。20世纪90年代，开关电源