一种高功率开关电源控制系统（A high power switching power supply control system）

1、一种高功率开关电源控制系统（A high power switching power supply control system）This article is contributed by airmcuPdf documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view.December 2013 2005Thirty-first volume, Twelfth

2、issueHigh voltage technologyHigh Voltage EngineeringVol. 31, No. 12, Dec. 200535A high power switching power supply control systemGu Liangcui (Department of information engineering, Changchun Institute of Technology, Changchun 130021)Abstract: describes the development process of the high voltage ch

3、arging power supply Philip control system based on sP89C662 MCU. The system will be charging voltage divider to sampling and converted into frequency signal by optical fiber isolation after conversion into the SCM detected. Application of programmable logic device to increase the flexibility of the

4、system hardware, power down save and LCD display function; resistance interference optical fiber isolation and shielding control system to ensure the working reliability. The charging power supply charging voltage of high precision, convenient operation, stable and reliable operation in the field. K

5、ey words: P89C662; optical isolation; control; power supply charging CLC number: TM910 document code: A article number: 100326520 (2005) 1220035202Control, System, of, High, Po, wer, Switching, Po, wer, Supply, Based, on, P89C662GU Liangcui(Dept, of, Informatio, N, Engineering, Changchun, Instit, ut

6、e, of, Technolo, Gy, Changchun, China)Abstract: This paper p resent s t he co nt rol system of t he high power charge power supply using single2chip comp uter P89C662. The charging voltage is measured by single chip comp uter which p rocesses t he signal acquired by fiber Key words: PP89C662 fiber;

7、cont; rol; charge power supplyT, ransmission, F, RO, high, voltage., reliability, of, t, he, NT, rol, system, is, ensured, by, using, fiber, and, shield, box., Co, The, has, been, P, roved, t, The, hrough, m, t, he, operation.Charging, power, supply, has, t, advantage, of, high, charging, voltage, P

8、, recision, Co, nvenient, operation, and, it, s, he, reliability0 IntroductionThe light output by the pulsed xenon lamp will supply energy to electric energy conversion module, so the power system is an important part of the laser 1. Safety requirements of laser power supply system reliability, conv

9、enient operation, meet the operation requirements. The original control system using programmable controller (PL C), but the volume is large, the operation is complex, cost is too high. The control system uses Philip s microcontroller P89C662 production 2 as a controller, programmable logic device (

10、CPLD) plus 3 5 to achieve control of the entire system.1 hardware systemMachine cycle instruction speed 1/ 2, much higher than the ordinary 8051; Flash memory has 32 KB, parallel programming, can also be a serial in system programming (ISP); 3 16 bit timer / event counter; interrupt source, 4 interr

11、upt priority interrupt can be nested inside a structure; full duplex enhanced U A R T and a I2 C serial interface; with on-chip oscillator and timing circuit of.P89C662 new features make it become a powerful microcontroller, fast running speed, strong processing ability, high performance price ratio

12、. 2): driving circuit driving circuit to the I GB T provides a trigger pulse. CPU I/ through the O port to control the start and stop.Drive circuit using oscillation control chip MC33066 control with high performance, it is through the external circuit parameters, adjust the output frequency and dut

13、y ratio. There are two high current totem pole output, two output among the dead programmable. Use it to drive the I GB T, simple, safe and flexible. 3) detection circuit detection circuit the feedback signal is returned to the controller form a closed-loop system. The detection circuit detects a vo

14、ltage signal and converts it to a frequency signal, in order to adapt to the digital signal optical fiber transmission; simultaneous detection of over-current, over temperature, discharge switch state, the end of the soft start signal. The voltage signal obtained by the divider because the actual vo

15、ltage sampling. The amplitude changes from tens to 200 kV, so the sampling circuit must be high sampling precision, good isolation effect, it is divided into 2 parts: the 1 divider circuit, taking into account the pressure in the air will Corona, leading to the sampling voltage allowed, will be arra

16、nged in an organic glass tank filled with transformer oil in preventing corona. In addition, resistor is used in lithography and low temperature drift precision resistance; 2 is the pressure frequency conversion circuit, the pressure to obtain the exact pointsThe overall block diagram is shown in fi

17、gure 1.Figure 1 hardware system composition1) master control unit: the P89C662 core of Philip s companyChip, the kernel is 8051, with the traditional 8051 function, and in performance has greatly improved, and more peripheral function module: available33 M Hz crystal oscillator; 6 h for a machine cy

18、cle, is the traditional 8051Fig1 1, H, ardware, structure? 36. Dec. 2005High Voltage EngineeringVol. 31, No. 12Enter the first sampling voltage follower circuit, circuit followed by high precision, quick response, low drift operational amplifier AD744. The structure of the sampling voltage follower

19、output to V FC32, the input signal is converted into frequency voltage is proportional to its 6, 7. A voltage follower and voltage frequency converter circuit see figure 2. first part no isolation measures signal cannot be directly transmitted to the microcontroller 2, choose the optical fiber as th

20、e signal transmission medium. Through the conversion of electrical signals into light signals, to achieve isolation, anti interference, small attenuation.The great economic losses. In order to ensure the normal operation of SCM in the circuit design, using a variety of anti-interference measures: Sh

21、ield: control panel with a grounding box, eliminating interference; isolation: power supply, grounding part, optical fiber coupler isolation sensitive parts; high frequency filter: power line and signal line with ferrite in order to reduce the noise of magnetic interference, power control board line

22、 and relay with filter capacitor and capacitor voltage. The actual results show that the system has good anti-jamming effect, MCU electromagnetic disturbance in harsh environment, the work is stable, no running or misoperation.2 software designFig. 2 voltage follow and voltage frequency conversion c

23、ircuit diagramAfter the voltage signal is converted into pulse signal and sent into the singlechip, the mutation caused by interference is filtered through the software filtering program, and the singlechip is usedT0 and T1 frequency measurement, T1 used to record external pulse count, T0 used for25

24、 ms timing operation and the number of pulses measured, get real-time voltage fault protection of over-current, over temperature signal into the microcontroller non-maskable interrupt port. The discharge switch state and the end of the soft start circuit breaker is transmitted to the MCU MCU port, a

25、ccording to the information and take appropriate control strategy and, using liquid crystal and L ED E2. 4) indicating the state of the PROM module: the 24C02 chip data storage and backup. The chip is 2 Kbit s chip to read and write to meet the I2 C bus protocol, the controller can make the importan

26、t data in a reliable storage system in a long time under the condition of power failure. 5) human-computer interaction circuit: the control panel with the keyboard and LCD, the user can understand the current state of the real-time data such as voltage,Query and modify the data to directly control t

27、he charge and discharge. At the same time it with the PC through the optical fiber communication, we have designed the interface in the PC machine with Delp Hi, the user can data curve and remote control in the PC machine interface is friendly, easy to use. 6) other logic circuits: programmable logi

28、c device for mining complexInternally, CPLD implements.CPLD with high speed, high integration, and high availabilityDepending on the nature and the development of convenient standard advantages. Device programmability in the hardware circuit after the production can be re programmed logic, modify th

29、e port flexibility, compared with the gate circuit for many programs, anti-interference ability is enhanced. A variety of anti-jamming measures 8 to 11 we take in in this system, the control object is the high voltage equipment, space electromagnetic interference is serious, especially in the moment

30、 of discharge, the discharge current up to several kA, high frequency discharge of various stray parameters exist at the same time with the main discharge of the formation of lead wire, grounding table and capacitor structure potential 12 caused a substantial raise. All equipment is seriously distur

31、bed, even lead to failure caused by experimentFig. 3 flow chart of main programFig1 3, Main, program, flow, chartFig1 2, Circuit, diagram, of, V, F, transform, 2The software adopts C language modular programming, the program has a strong portability. The basic state of the system main program of the

32、 system is shown in figure 3. There are 7 procedures to ensure the reliability of the system through logic complex. MCU general in a wait state, receives a signal or a microcontroller system keyboard PC operation according to the current state of make a judgment and control, including parameter sett

33、ing and inquiry, charge and discharge control and ignition tube baking control, also completed the overvoltage, overcurrent protection, reverse voltage and ignition tube flashover fault protection and alarm, the real-time data display and so on. Figure 4 is the T0 interrupt program the T0 interrupt.

34、 Each of the 25 ms once, in addition to the completion of voltage value calculation and software filtering, but also real-time monitoring 13 15 charging, when the voltage exceeds upper or lower threshold sinceFigure 4 T0 interrupt subroutine flow chartFig1 4, Subroutine, flow, chart, of, T0, interru

35、pt(turn to page forty-first)December 20053 conclusionHigh voltage technologyThirty-first volumes, twelfth, 41High intensity pulsed electric field can make the activity of papain decreased. The inactivation rate and electric field strength and pulse number is proportional to, and the latter effects o

36、n papain more. The main reason is not the active site cysteine oxidation inactivation of papain, temperature and shear effect on enzyme activity is not great. Little variation in conductivity before and after the reaction, the possibility that the electrochemical reaction is not large. Therefore, th

37、e conformational change of P EF causes the inactivation of the enzyme and enzyme molecular structure or active site. High strength instantaneous electric field under the effect of spiral structure of enzyme protein may loose expand and cause the active site of the enzyme changes in enzyme or active

38、site electric field, destroy the active binding sites, which leads to a decrease in enzyme activity. In the next study by X2 ray diffraction method 15 The structure of papain was compared in detail before and after treatment, and the mechanism of inactivation was further determined3 Zhang, Zeng, Xin

39、an, Fu, et al. Study on non thermal sterilization of liquid by high intensity pulsed electric field JFlash, make a preliminary error measures and corresponding protection, processing by the main program. Fault interrupt complete overcurrent and overtemperature fault. Preliminary processing for seria

40、l port interrupt and PC machine communication, including receiving the control commands and data transmission.3 conclusionThe system has low cost, complete functions, reliable work and strong anti-interference abilityThis system effectively combines high speed and high reliability of microcomputer c

41、ontrol flexible and good man-machine conversation function combined with PLD, has high cost, small volume and strong anti-interference ability, after the scene more than a year of operation shows that the system is stable, the reliability function to meet the design requirements, fully meet the actu

42、al needs.1 Humberto Vega Mercado, Olga Martin Bello so, Qin Bailin, et al. Non2 J avier 2 Raso. Not hermal P reservation of food using combined p rocessing techniquesJ Critical Review in Food Science. And Nut rition, 2003, 43 (3): 2652285. 4 Butz P, Tauscher B. Emerging technologies: chemical aspect

43、 s J. Food Research International, 2002, 35 (5): 2792284.(up to thirty-sixth pages)1 Lin Fuchang, Lee, pan, etc. Jin Yuan SG-III energy module. The overall design of J high voltage engineering, 2 zhouligong. Enhanced 80C51 microcontroller with the actual crash M. Beijing: Beijing Aerospace 2002, 28

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45、dsJ Trends, in, Food, Sci2Xu Yali, born in 1979, is a master degree student in the field of high intensity pulsed electric field non thermal sterilization technology:(020) 87114571; E2mail: cherry_xyl, tom., comZeng, born in Xinan in 1972, Ph. D., associate professor, mainly engaged in the applicati

46、on of high intensity pulsed electric field in the food industry5 Ragip Unal, Ahmed E Yo SEF, C Part Rick Dunne. Spect rofluo Rimet ric as2 sessment of bacterial cell membrane damage by pulsed elect ric field J. 254. 6 Zhang, Zeng Xinan, Zhu Siming. High intensity pulsed electric field on the content

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