单片机科技论文.docx

1、单片机科技论文科技论文Frequency conversion control system microcontroller peripheral circuit design系 别 专 业 班 级 学生姓名 Frequency conversion control system microcontroller peripheral circuit design【 abstract 】 single-chip microcomputer with appropriate peripheral devices and applications, consists of the applicati

2、on 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 comp

3、any 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 si

4、gnals 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 MAX7

5、08 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

6、 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

7、 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 circu

8、it is used for to show to turn soon, electric current, and adjust to try of related items 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

9、 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 tec

10、hnique.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 neg

11、ative 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 prop

12、erty 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

13、 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 ph

14、ysically 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

15、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

16、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

17、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

18、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.Th

19、ree, 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

20、 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

21、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 g

22、round 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 transf

23、ormation 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 peoples P2.5, P2.6 and P2.7 of the slice machine.CPU

24、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 con

25、nect 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 differentia

26、l 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

27、 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 sho

28、uld 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 ad

29、opted 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 an

30、d 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

31、 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 engine

32、ering 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 dont work as usual circumstance of possibi

33、lity.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 roundin