外文翻译---防盗电话报警控制器电路的设计(编辑修改稿)

外文翻译---防盗电话报警控制器电路的设计(编辑修改稿)内容摘要：

ivations, used for temperature pensation and additional control functions. When having photosensitive properties of PN junction by irradiation, formation, thus resulting in the light of photocurrent 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 pared with photosensitive diode, has the very big photocurrent 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 ponents, with current amplification effect, is the core of electronic circuit ponents. 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 basebed, two side part is the launch region and integrating electricity area, arrangement have 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 basebed between PN junction that launch knot, bines electronic zone and basebed between PN junction called the collector. Basebed 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 direction 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 function 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 earthshaking changes. Photo transistor is a kind of important derivatives. 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 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 inside, 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, waste 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 electromagic relays to plete the circuit. Daylighting point selection is a key, because not every classroom bright degree is the same, we can use multipoint 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 can39。 t 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 won39。 t shut automatically. Also caused much waste. 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 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 just can make fluorescent lamp pulsory closed. To sum up, we can use light activated triode design a circuit, making the fluorescent lamp couldn39。 t 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 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 (English abbreviations for OC) is also called the photoelectric isolating device, the abbreviation lightcoupler. 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 bee 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 r。