毕业设计论文40342

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1、科技论文题 目 The Application of LCD 系 别 尚德光伏学院 专 业 计算机控制技术 班 级 0801 学生姓名 陈燕 学 号 080403 指导教师 梁 永 昌 2010年 12 月 Burglar telephone alarm controller circuit designSummary ：With the continuous development of electronics, applied electronics is steadily moving toward a new era. Electronic technology, electronic

2、 design, electronic products, such as the ever-changing update to the peoples lives is a big convenience. This paper introduced a confusing phone-based anti-theft controller circuit, if you are away from home, as long as you make a phone call to home, your home will sound tape recorders, dark, the i

3、nterior lights will be bright. The circuit by the signal input circuit, trigger circuit, driver circuit, light sensors, integrated electronic switch circuit. The design detail of the anti-theft alarm detection phone part of the whole production process, but also by the content of the design done a k

4、ind of success.Keywords: telephone anti-theft electronic switchA, design of purpose and meaning 1. Learning basic theory in practice comprehensive use of the initial experience, master the basic methods of electronic circuit design, the design procedure, the ability of training comprehensive design,

5、 2. Through the actual system application and operation, to deepen the understanding of the knowledge, 3. Through the assembly and debugging cultivation of practical skills, improve the analysis and the ability to solve practical problems. Second, design planning 1, design idea Confuse anti-theft te

6、lephone controller circuit, if you go out in the outside, as long as you to call home, your house will be issued a voice recorder, dark, indoor light will shine. This circuit by power supply circuit, signal input circuit, trigger circuit, drive circuit and photosensitive sensors, integrated electron

7、ic switch circuit composed. 2, design charts Third, each part of the circuit design 1 and power circuit design The direct current voltage-stabilized source structure diagram: Utility voltage transformer and pass through the fuse IN4007 diode rectifier, lower blood pressure, LM7805 capactance filteri

8、ng, avr output, use red leds instructions power circuit work condition and power circuit principle as figure2shows.Figure 2 power circuit220V utility after transformer T step-down, output voltage, communication about 9V diode (VD1 VD4) bridge rectifier, capacitance C1 filter out the high-frequency c

9、lutter after LM7805 feet, 1 to 2 feet grounding, 3 foot stable output voltage, voltage for 9V. C2 further filter high frequency interference, supply circuit work, red issued diode is the power indicator light emitting diode, R1 is the current limiting resistor, light emitting diode current for norma

10、l work of 10mA. Transformer principle is very simple elfevident transformer is main function of variable pressure, also is change voltage. Transformer is principle electromagnetic induction technology, transformer has two independently of sharing a core of coil. Respectively called transformer subpr

11、ime coil and primary coil. Current direction and size varies with time, transformer primary tong on ac, transformer core created alternating magnetic field, (including connect power of winding called primary coil, the rest of the winding called subprime coil. In the same frequency induction subprime

12、 is the ac voltage. The first level of transformer winding of turms than equal voltage than. Transformer can only change ac voltage dc voltage, and do not change, because the direct current is not change, current through the transformer wont produce alternating magnetic field, so only in subprime co

13、il directly connected moment produces a instantaneous electric current and voltage. LM7805 is three terminal voltage stabilizer fig.03 shows: (1) the feet to the input voltage regulator Ui, 3 feet for the grounding end; 2 feet for voltage stabilizing voltage Uo output terminal. LM7805 have 5V, 6V, 9

14、V, 12V, 18V and 24V 15V, seven different fixed output voltage, which are widely used in various kinds of electronic equipment. Maximum output current for 1.5 mA.LM7805 stabilizer with internal over-current, thermal overload and output crystal figure 3 LM7805 tube feet body tube safety protection fun

15、ction, circuit used Safe and reliable. Although according to fixed voltage stabilizer which design, but external pick a few components, can make adjustable voltage stabilizer or adjustable stablized implement use.2, signal input circuit design When the telephone in hang condition, telephone lines L1

16、, L2 between 40 60V of dc voltage, due to the capacitance C1, C2 role, not by integrated circuit IC1 triggered such components delay circuit. When people call scoring comes, L1, L2 coming signal submitted variable state, ringing the capacitance C! C2 coupling, diodes, VD1, VD2 times pressure rectifi

17、cation, electricity Let the C3 filtered into a positive dc voltage up to triode V, resulting in the base of V saturated conductivity 3, trigger circuit design This circuit adopts NE555 time-based circuit as schmidt trigger circuit, triggering high sensitivity and reliability. Figure 8 is by the time

18、 base circuit 555 and RA, RB, RC minority components adjustable threshold voltage Schmitt toggle, visible by comparator drive schmidt trigger circuit, total output has two port: one is 3 feet of rectangular pulse output, A discharge end (DSC) 7 feet discharge waveform (external capacitor). (a) circu

19、it diagram (b) schmidt trigger characteristics图8A separate pressure in the circuit spare some input in RP potentiometer signal for Vin, adjust RP will input signal has a certain range change, according to the trigger reset and 555 buy a characteristics, and its output terminal Vo (3 feet) will has t

20、he following changes: When the input triggered signals Vin (figure 8 - less than VA b), set 2 feet for level low level 0, the six feet also for low level 0, then in a state, buy 555 feet high potential output is 3 1, When the VA Vin 1/3VDD and Vin VB (2/3VDD), turn a 555 reset state, that is, 3 foot

21、 output to low level 0. By the above analysis and graph (b) visible, 555 triggered and transmission characteristics, and its rise and decline of the characteristic signal characteristics do not overlap, and the existence of back to poor V, reason this voltage trigger circuit called schmidt circuit.

22、Back to the poor V size of voltage V = VB - VA = = VDD - VDD = = VDD Change the ratio of RP and RB, may change the circuit back V. Poor voltage The main 555 time-based circuit parameters and all tube foot function In order to correctly use 555 time-based circuit, must understand its one of the param

23、eter value, below, is its parameters (1) 555 time-based circuits using the voltage of power supply in 4.5 16V range, so this circuit adopts 5V voltage power supply. Static current is also called work refers to the source current when the consumption of manifold blocks no-load current. At that time,

24、when the yankees integrated blocks on pin connected to the power source voltage: 555 time-based 5V circuit of static current typical values about 10mA. (2) threshold voltage and current threshold When added to 555 time-based circuit threshold input that the voltage is equal to or greater than 2/3Vcc

25、 (or VDD voltage), work, make its output from the high level into low electricity at ordinary times, voltage 2/3 Vcc namely for its threshold voltage UTH, causing the time base circuit state flip need working current is called threshold current ITH. Various time-based circuit threshold value of curr

26、ent as 0.1 u A left. (3) timing precision Timing precision refers to the time base circuit used when used in precision degree of timer. Two time base circuit of the timing precision 1%. (4) discharge current 555 as timer or more harmonic oscillator when using, used the discharge end to external capa

27、citor a grounding discharge access. By figure 2-1 can see, discharge current needs to pass a discharge tube VTD because of its current to limit, or current had congress to make VTD burn out. The discharge current 555 IDIS in 10 50mA between, and decreases as the power supply voltage VCC (or VDD) num

28、erical changes, Use the voltage of power supply, the higher the discharge current is greater. (5) trigger voltages and trigger current When added to 555 time-based circuit trigger input voltage of less than or equal to 1/3VCC, make its output from the low level into high electricity at ordinary time

29、s, voltage value 1/3VCC namely for its trigger voltages UTR. Cause time-based circuit state flip need working current is called trigger current ITR. All the time base of the circuit to 0.5 muon A trigger current. (6) reset voltage and reset current When at 555 time-based circuit Lord reset end MR (n

30、ot) with low level, can make its output reset (namely VO = 0), which I have put UMR reset voltage should be below the 1V. Cause time-based circuit reset need working current is called reset current IMR. Various time-based circuit for 400 mu A reset current to the left. (7) the highest working freque

31、ncy The highest working frequency refers to point circuit is connected into 555 when oscillating circuit when using, the highest frequency output pulse. (8) drive dc Drive dc refers to the time base circuit while working for load provides output current, also called load current IL, according to the

32、 time base circuit of the output state and load connection, drive current usually divided into pull current with inhaled current two kinds. 555 time-based circuit each tube foot function One feet: power negative GND terminal Two feet: low flip-flop, abbreviation trigger end TR non Three feet: output

33、 terminal OUT, can will relay coil etc load attached to it, the other side with power positive or negative connected, its biggest output current is not less than 200MA Four feet: mandatory reset end, if do not need not MR compulsory reset, and can be connected with power positive or impending Five f

34、eet: used to regulate the comparators benchmark voltage, abbreviation control terminals Vc, if do not need to adjust the benchmark voltage, it may be suspended or through 0.01 u F, capacitors grounded. Six feet: high flip-flop, or called threshold end TA Seven feet: discharge end DIS Eight feet: con

35、nect the power supply, the positive VDD 555 time-based circuit allows supply voltage 450 V 18V 4. Driver output circuit design For 555 integrated circuit maximum output current 200 ma, so cant reliable direct drive dc relay, reason need to add level 1 transistor amplifier, so the driver output porti

36、on composed by the transistor and relays. This circuit relay models 4098, dc resistance to 300 , drive current for 200 ma, reason transistor collector current should be more than 300 ma, set transistor current amplification coefficient for 50, the beta transistor turn-on the base current for 300/50

37、= 6 (ma). Can be calculated resistance R10 = (6V - 0.7 V) / 6mA hundredth 9K , so this circuit R10 take 10 K, triode can be used for 9013, maximum output current 500 milliampere. 5 and photosensitive sensor This circuit photosensitive sensor adopts light activated triode 3DU31, it is one of the most

38、 common photodetector, its sensitive wavelengths in the visible wavelength near infrared wavelength and ultraviolet ray, including wavelength. Light activated triode and ordinary triode similar, also have current amplification effect, but it is not just the collector current by passive circuit and c

39、urrent control, but also by ray radiation control. Usually base not derivation, but some light activated triode base have derivations, used for temperature compensation and additional control functions. When having photosensitive properties of PN junction by irradiation, formation, thus resulting in

40、 the light of photo-current born by base into emitter current collector loop, in order to get an enlarged equivalent to beta times the signal current. Different material made of light activated triode have different spectral characteristics and compared with photosensitive diode, has the very big ph

41、oto-current amplification, namely high sensitivity. Through to the semiconductor diode and triode learning, I understand the transistor the basic structure and working principle of semiconductor, transistor, is one of the basic components, with current amplification effect, is the core of electronic

42、 circuit components. Transistor is in a semiconductor substrate production two are located very close of PN junction, the two PN junction is divided into three parts, block semiconductor middle part is base-combed, two side part is the launch region and integrating electricity area, arrangement have

43、 PNP and two NPN transistors, as shown in figure drawn from three areas corresponding electrode, respectively base b emitter e and collector c. Launch region and base-combed between PN junction that launch knot, combines electronic zone and base-combed between PN junction called the collector. Base-

44、combed is very thin, and launch region thicker, impurity, PNP transistor concentration large type emission region fire is the direction of movement, the cavity with current direction, reason emitter to the arrow, NPN transistor launch region firing type is free electrons, which the movement directio

45、n and current in opposite directions, so emitter arrow outward. Emitter arrow outward. Emitter arrow in also PN junction in forward voltage under the conduction direction. Silicon transistor and germnium transistor have PNP type and NPN type two kinds. Although key learning transistor amplifying fun

46、ction of transistors, but I more interested in the switch function. Semiconductor like a switch, can pass conduction and the due to control circuit. Semiconductor by adding part of trace element will make its characteristic earth-shaking changes. Photo transistor is a kind of important derivatives.

47、Human body is the most important visual sense, therefore, I think through light to control circuit is really too subtle, and photosensitive diodes triode just can finish this task. Because light activated triode due to still have amplification, therefore application than diode more extensive. Light

48、activated triode is used for measuring brightness, often with light emitting diode is used together as a signal receiving devices. Use examples below introduce various functions. (1) measurement brightness In the classroom library, and many times, fluorescent lamp daytime also on, in the dormitory i

49、nside, fluorescent lamp is often rest day and night, the students on this waste has insensitive. Some classmates in the morning to go to the classroom, although the classroom very bright but also open lamp, although a daylight lamps will not waste much resources, but many a little makes a mickle, wa

50、ste is a lot. Therefore, we can be in the classroom install a control circuit, when brightness to a certain extent, making the classroom inside and inside the dormitory fluorescent lamp will fail to start. We can use light activated triode additional electromagnetic relays to complete the circuit. D

51、aylighting point selection is a key, because not every classroom bright degree is the same, we can use multi-point sampling to meet this requirement. For example in 20 classroom are placed light activated triode, we can set, if they all or most of their brightness is very high, so, fluorescent lamp

52、cant start normally, achieve the purpose of saving energy. Still have a kind of situation, be if one day filled the sky dark clouds, the brightness of insufficient, so fluorescent lamp can be opened. But soon, the weather sunny, fluorescent lamp tonight.at wont shut automatically. Also caused much w

53、aste. In daylighting point where can be installed outside the classroom when indoor daylighting points, a strength the difference value is narrowed to a certain range, we can think fluorescent lamp role can neglect, fluorescent lamp will automatically closed. Another option, if it is raining outside

54、 the classroom, classroom inside the sun lights on and at the window, make a lightning outside is very bright, fluorescent lamp had closed down, which can cause trouble. So to avoid this problem. Methods is in circuits installed counters, makes the brightness difference in maintaining a certain time

55、 just can make fluorescent lamp compulsory closed. To sum up, we can use light activated triode design a circuit, making the fluorescent lamp couldnt normal starting or be forced to shut down so as to achieve the purpose of saving energy. Of course, the feasibility of this method from now see is not

56、 very high, circuit will disguise expense may be high will affect the implementation. But I think can indeed through light activated triode qualities to get saving purpose. (2) photoelectric isolation Light activated triode of another action is transmitting signals, optical coupler, optical coupler

57、(English abbreviations for OC) is also called the photoelectric isolating device, the abbreviation light-coupler. Optical coupler and light for media transmission signals. It for input and output signal has good isolation function, therefore, it in various circuit widely applied. At present it has b

58、ecome the most species, use is the most extensive photoelectric device one. Optical coupler generally consists of three parts: the light emission, light receiving and amplification. The input signal driven light emitting diode (LED), making out certain wavelengths of light, caused by light detectors

59、 receiving photo-current, repass further amplification after output. This completes the electricity - light, electricity conversion, thus plays input, output, isolation effect. Caused by the coupler input and output signal transmission between mutual isolation, etc, thus has mono-direction with good

60、 electrical insulating ability and the anti-interference ability. And caused by coupler input belongs to the current model work of low resistance components, thus has the very strong common-mode rejection capability. So, it is long term transmit information as terminal isolation components can be gr

61、eatly improved signal-to-noise ratio. In computer digital communication and real-time control as signal isolating interface device, can greatly increase the reliability of the computer work. 6, integrated electronic switch circuit design This circuit with two relay control tape-recorder power and li

62、ght, control of power by tape-recorder 555 trigger circuit, and control the lamp is adopted TWH8778 type power switching integrated circuit, it USES TO - 220 five feet plastic packaging, TWH8778 internal no over-voltage, overheating, over-current protection circuit, such as TWH8778 28V / 1A below in

63、 doing high-speed switching. It just takes in control end (the first 5 feet) plus about 1.6 V (maximum 6V) voltage, can rapid control fan-out (the first (2), (3) feet) load power, control the hige extremely input current around 50 mu and A right. TWH8778 can also use appearance, function exactly as

64、congener product QT3353 directly substitution. Two relays are made of the JQX - 4F type power in the electromagnetic following the circuit, contact form for 4H time, with four groups often open electric shock all associate with load capacity, in order to increase. Four, working principle and circuit diagram (1), total diagram (2), the working principle of the system Confuse anti-theft telephone controller circuit, if you go out in the outside, as long as you to call home, your house will be issued a voice recorder, dark, indoor light will shine. This cir