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 p
3、ower 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 imp
4、orted 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, refu
5、se 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 sw
6、itch 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
7、 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, including: 1 The whole the e
8、ffect 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 altern
9、ating, 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 w
10、ith 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 detect
11、ion 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 interval K repeatedly
12、 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 input power load i
13、s 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
14、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 * E For
15、 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
16、 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 Modula
17、tion (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 modulation 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 dont need to increase speed switches can
