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1、 本科毕业设计外文翻译 学 院 专业班级 学生姓名 指导教师 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 rea
2、lize miniaturization. In recent 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 product
3、s. High frequency switching power 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 feat
4、ures: 一This product USES imported 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 an
5、d surface aestivation, refuse the gloss 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 op
6、eration. Can bring load switch machine, 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 m
7、ore than a linear always voltage matching. Save the traditional rectifier regulator and the energy loss, in more than 35%, greatly reduce the cost, the reason of surface treatment industry High frequency switching power supply 一 The main circuit From the input and output of dc exchange network, incl
8、uding: 1The whole the effect is input filter: 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
9、high frequency alternating, this is the core 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 t
10、he output terminal with setting standards, and 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 me
11、asures. Third detection circuit：In addition to providing protection circuit is running in the various parameters but also provide various display meter data. Four, the auxiliary power To provide all the different requirements of a circuit switching voltage control principle Switch to certain time in
12、terval K repeatedly through and disconnect the switch, 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
13、 input power load is intermittent, for the load can 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 functio
14、n. Inductance used in storing energy, l., and stored 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:
15、EAB = TON/T * E For every TON of time, the switch to 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 automatical
16、ly adjusted TON and the proportion of T he can make the 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 Modulation, the abbreviation for PWM) Switch is c
