应用电子技术单片机科技论文Frequency conversion control system microcontroller peripheral circuit design.doc

科技论文Frequency conversion control system microcontroller peripheral circuit design系 别 尚德光伏学院 专 业 应用电子技术 班 级 0903 学生姓名 学 号 指导教师 2011年 4 月Frequency conversion control system microcontroller peripheral circuit design【 abstract 】 single-chip microcomputer with appropriate peripheral devices and applications, consists of the application system become the minimum system. The article to the frequency conversion control system of the single chip microcomputer buffer circuit design is discussed.【 key words 】 frequency conversion control; Single chip microcomputer; Buffer circuitThis design USES the choice PHILIPS semiconductors company with manual reset function MAX708 products. MAX708 can also monitor the second power signal, as the processor provide voltage drop into warning function, using this function, the system can be in power supply fall to reset before performing some safety operation, save parameters, send warning signals or switching back-up battery, etc. In addition, the system also expanded the programmable peripheral PSD303 chip. Because the system I/O mouth quantity and real ?The product MAX708 that designs to adopt to choose PHILIPS that the semi-conductor companies take to move to reset function.The MAX708 can also keep watch on the second power signal and provide the electric voltage the early-warning function for dropping into for processor and make use of this function, system can when the power drop into to carry out some safety operations before resetting, keep parameter, send out alert signal or cut over spare battery etc.On top of that, the system expanded programmable outer circle chip PSD303.Because the I of system|the O amount still have a very big margin with actual amount needed, past the system expanded two slices of 8255 Ases again, the one was used for connecting a keyboard and shown electric circuit, the one is used for contact to send letter number, and urgent parking signal.etc.A, keyboard with show electric circuitDesign at this in, establish an operation electric circuit of 9 keys to replace physically the operation button on the scene.6 LEDs show that electric circuit is used for to show to turn soon, electric current, and adjust to try of related item's showing.Moreover, for the sake of easy to the spot work it established 5 ×s then 4 of matrix type keyboard, used for when the system software waits to appear a mistake, but again the inconvenience directly carry on modifying to the procedure of adjust to try of use.Two, become repeatedly system designThe modern becomes repeatedly in the technique and mainly has 2 kinds to become repeatedly technique:Hand over-keep-hand over to become repeatedly a technique and hand over-hand over to become repeatedly a technique.Hand over-keep-hand over to become repeatedly technique for hand over-keep-hand over to become repeatedly and adjust soon system to provide to become repeatedly the power.Hand over-keep-hand over to become repeatedly constitute electric circuit have already commutated electric circuit and negative change electric circuit two parts, commutate electric circuit work repeatedly the alternate current commutate into direct current and go against to change electric circuit again direct current negative change into adjustable frequency alternate current.According to becoming repeatedly the property of the power can is divided into electric voltage type and electric current type to become repeatedly.This design is used and handed over-hand over and become repeatedly electric circuit is an impassability and lead in the center direct current link, but become the becoming of alternate current of different frequency to the alternate current of the charged barbed wire net fixed frequency direct transformation repeatedly electric circuit.This kind of becomes repeatedly the electric circuit be extensively applied to the big power alternate current motive adjusts to soon spread system and physically use of mainly is three mutually output to hand over-hand over to become repeatedly electric circuit.The characteristics of this kind of electric circuit:(1)Because is a direct transformation, have no in the center link, so compare general of the inverter efficiency have to be high;(2)It is direct to output electric voltage with its exchanges from communicate that some parts that input electric voltage wave wrap net constitute, as a result its exportation frequency the ratio input the frequency of AC power low, the exportation wave form is also good;(3)Because being limited by charged barbed wire net frequency, usually outputting the frequency of electric voltage is lower, or so for 1/3 of charged barbed wire net frequency;(4)The power factor is lower, especially much lower when the low speed circulates, need adequacy repair.Three mutually become repeatedly electric circuit more the list is mutually complicated, its electric circuit connects a line method to mainly have public exchanges mother the line is into the line method and exportation type coupling method.Concretely say come, it lord electric circuit the pattern have:3 zero type electric circuits, 6 separate to load a bridge type electric circuit, 6s improper leave to load a bridge type of electric circuit and 12 bridge types electric circuit and 3 take the middle point triangle load electric circuit and 3 wreath formses electric circuit.This designs more simple 1 kind of choice-3 zero type electric circuits.Three, the synchronous electric circuit designThe function of synchronous electric circuit BE, at to should of crystal Zha tube the acceptance is just facing the sun pole electric voltage of beginning start a point(namely control starting counting of Cape point) to send out a CPU can identify is which same alike tread the interruption pulse of signal Utpi and the control for Cape to carry on postpone of request, output homologous of trigger pulse.Three homologies tread the electric voltage signal through the synchronous transformer, filter wave, steady press, enlarge to insulate to connect into respectively behind with optoelectronics list P2.5, P2.6 and P2.7 pinses of the slice machine.Moreover, because of here direct current the power and trigger electric circuit in the power used can not totally use, and the optoelectronics Ou match a machine importation the exportation carries of the ground carry to can not totally use, either, for the sake of with show differentiation, they of the sign all have a dissimilarity.Ua, Ub and Uc with can control Huo module of three mutually communicate electric voltage together and mutually.Ua, Ub and Uc through R3, C3 after filtering the form transformation light Ou of an electric circuit wave insulate orthopedics electric circuit output three mutually square wave electric voltage, record to carry for KA, KB and KC, three mutually square wave sending to the 80 C196 respectively list the P 2 people's P2.5, P2.6 and P2.7 of the slice machine.CPU judges three according to the value of KA, KB and KC AC power mutually of mutually.Four, trigger electric circuitIn the design, three mutually electric circuit in mutually and all have each time two sets of positive and negative crystal Zha tube, each one adopts three mutually the half wave type connect a method, namely each use three pipes, so totally have 18 crystal Zhas to take care of, so, triggering the pulse should also have 18 roads.The triode transistor V enlarges transistor for output stage power;In order to accelerate electric capacity, the electric capacity C constitutes differential calculus electric circuit with R, can follow before raising pulse of abrupt degree;For give attention to both anti- interference the ability and pulse is ex- to follow an abrupt degree, generally take C to 0.1 of F.In order to protect pulse transformer, merge electric resistance R and establishing of diode D electric circuit in the pulse transformer both ends, the general R resistivity takes to 1 K.The electric resistance R is a leave electric resistance to load.Moreover, for the sake of insulate importation output signal, joined optoelectronics Ou to match a machine, in consideration of should have enough pulse strength to make the crystal Zha tube leads and output pole the electric voltage establish to 15 Vs.In the middle of setting out electric circuit, for getting enough pulse width, and making pulse ex- to follow as far as possible abrupt, empress along with descend quickly, so adopted pulse transformer TT.Moreover, for attaining an electricity insulation function, as well joined optoelectronics to accidentally match a machine.Furthermore, for easy to list slice the machine carry in the synchronous transformer 118 importations to the control that triggers electric circuit and led to go into urgent blockader signal respectively(from HSO.0 lead to go into)with 555 in fixed time machine constitute of many Xies flap to concuss machine signal, while many Xies flap the control signal of concussing the machine then from list HSO of the slice machine.One control.Thus, when the electrical engineering inputs urgent parking signal, list slice the machine pass its HSO.0 output Gao Dian Ping, so make to trigger an electric circuit importation port of or the non- door be blockaded, also namely blockaded to become to repeatedly equip of trigger pulse, make the electrical engineering quickly park the car.Five, the protection electric circuit designFor raising the credibility and safety of controling the system, in design and movement communicating electric power system, all have to in consideration of have occurrence breakdown and don't work as usual circumstance of possibility.At three mutually communicate electric power system in, the most familiar and the most dangerous breakdown is multiform short circuit, include three among them mutually short-circuit, two mutually short-circuit, on connecting a ground of short circuit and electrical engineering and transformer on mutually rounding full circle on set short circuit, there is certainly also the protection measure of other forms.The concrete protection form has:The electric current type protects, the electric voltage type protects etc.For simple rise to see, here only adopt an electric current type to protect medium short-circuit proof and conduct electricity to flow a protection, and in settling of each electrical engineering sub- importation carry all connect go into positive and negative to communicate to get in touch with a machine.Moreover, the occurrence of in bar of surprised circumstance, led to go into urgent parking signal, be press urgent parking key list slice the machine pass in the center break to get in touch with the machine KM2-KM8 after the electric appliances pass.Six, the feedback link designIt led to go into electric current feedback in this system.The electric current feedback adopts three mutually exchanges with each other feeling machine, through three mutually the bridge type commutate electric circuit and filter an electric circuit and finally flow, filter to spread to limit electric circuit feedback back through the limit list the P of the slice machine 0.1 people.The evolution of the embedded system design method in general because the drawing of the application requirements and IT technology boost.1. With microelectronics technology of constant innovation and development, large scale integrated circuit technology level of integration and improve continuously. Silicone material and the combination of human wisdom, produce large quantities of low cost, high reliability and high precision microelectronic structures module, push in a brand new technology field and the development of the industry. In the developed on the basis of device programmable thought and micro (implement) technology can use software to change and achieve the function of the hardware. Microprocessor and all kinds of programmable large scale integrated circuit, half custom components for a large number of application, and opened a brand-new world of application, and extensive influence and in gradually changes in human production, life and learning and social activities.2. Computer hardware platform performance greatly raised, make a lot of complex algorithms and convenient use interface can be realized, improve working efficiency, to complex embedded system designed to provide auxiliary physical basis. 3. High performance of comprehensive development tools EDA (the platform) get rapid development, and its automation and intelligence to improve the complex embedded system design provides different purpose and different level set editor, layout, wiring, compilation, comprehensive, simulation, test and verify and device programming such as integration of easy to learn and ease of use of the integrated environment for development.4. Hardware description Language HDL (Hardware Des cription Language) for the development of complex electronics system designed to provide all kinds of Hardware model established working medium. The description ability and abstract, and a strong ability to hardware circuit, especially half a custom large scale integrated circuit design has brought about significant change. At present, with more have already become IEEE standard for STD1076 of VHDL, IEEE STD 1364 standard Verilog HDL and Altera company enterprise standard AHDL, etc.Due to the development of standardization and HDL, the world appear some use of HDL integrated circuits functional module of the professional design company. Its mission is to press common or special function, use to describe the HDL integrated circuit function and structure, and through the different levels of the test form different levels of IP kernel modules, for chip design personnel assembly or integrated to choose.IP (Intellectual Property) kernel module is a pre-designed has even proven certain definite functions of integrated circuit, devices or components. It has several different forms. IP kernel module have works (behavior), structure (structure) and physical (physical) level 3 different degree of design, should be the main description of functional behavior "soft IP core (soft IP core)", complete the description of the structure of "solid IP core (firm IP core)" and based on physical description and through process validation "hard IP core (hard IP core)" three levels. This is equivalent to integrated circuits (devices or components) blank, semi-finished products and finished products design technology.Soft IP is usually in some HDL kernel text submit users, it has been behavior level design optimization and function test, but one does not contain any specific physical information. Accordingly, the user can comprehensive out right gate level nets table, and can carry on the following structure design, have the greatest flexibility, can be easily by EDA tools and