The Introduction OfHigh Frequency Switching Power SupplyIntroduction: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 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 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 features: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 and 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 operation. 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 more 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 industryHigh frequency switching power supply一．The main circuitFrom the input and output of dc exchange network, including:1．The whole the effect is input filter: there will be the clutter power filter, also hindered the feedback to produce clutter of public power.2．And rectification and filtering: ac power grid directly to a smooth dc rectification, in order to the next level.3．Inverter: after rectifying dc into high frequency alternating, this is the core part of switch power supply, the higher the frequency volume, and weight and output power than smaller.4．And 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 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 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 switch, the power input, K E through switch and filter circuits provide load RL, throughout theswitch 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 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 function. 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:EAB = TON/T * EFor 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 automatically 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 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 modulationConduction 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 cantheoretically the switch loss to zero, and noise is smallThe development of switch 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 1980s, 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 semiconductor 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 the 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 capacitor, 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 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 device 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 reach several KHZ, The switch power MOSFET using frequency conversion of hundreds of KHZ. To improve theswitch 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 improve 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 four 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 range, 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 reliability - 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 integration. 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 converting 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 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 switch 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 magnetic 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。